Enhance your understanding with Rankers Hub Physics MCQ for SSC MTS. These SSC MTS Physics MCQ Objective questions and answers cover all important topics of Physics, helping you grasp the exam pattern, increase accuracy, and build confidence.
Practice the following Physics MCQ for MTS Exam
1. Persistence of vision is the principle behind
(1) Camera
(2) Spectroscope
(3) Cinema
(4) Periscope
Answer is Option (3) for SSC MTS Physics MCQ
Persistence of vision is the phenomenon of the eye by which an afterimage is thought to persist for approximately one twenty-fifth of a second on the retina. Persistence of vision is still the accepted term for this phenomenon in the realm of cinema history and theory. In the early days of film innovation, it was scientifically determined that a frame rate of less than 16 frames per second (frame/s) caused the mind to see flashing images.
2. In a nuclear reactor, one of the following is used as a fuel.
(1) Coal
(2) Uranium
(3) Radium
(4) Diesel
Answer is Option (2) for SSC MTS Physics MCQ
Many contemporary uses of uranium exploit its unique nuclear properties. Uranium-235 has the distinction of being the only naturally occurring fissile isotope. Uranium-238 is fissionable by fast neutrons, and is fertile, meaning it can be transmuted to fissile plutonium-239 in a nuclear reactor. Another fissile isotope, uranium-233, can be produced from natural thorium and is also important in nuclear technology.
3. The density of the liquid when heated
(1) decreases
(2) increases
(3) does not change
(4) may increase of decrease depending on pressure
Answer is Option (1) for SSC MTS Physics MCQ
The mass density of a material varies with temperature and pressure. Increasing the temperature of a substance (with some exceptions) decreases its density by increasing the volume of that substance. In most materials, heating the bottom of a fluid results in convection of the heat from bottom to top of the fluid due to the decrease of the density of the heated fluid.
4. The distance between node and adjacent antinode is 30 cm. The wavelength is
(1) 30 cm.
(2) 90 cm.
(3) 120 cm.
(4) 60 cm.
Answer is Option (4) for SSC MTS Physics MCQ
A node is a point along a standing wave where the wave has minimal amplitude. The opposite of a node is an anti-node, a point where the amplitude of the standing wave is a maximum. The distance between a node and anti-node is 1/2 of a wavelength; since a wavelength is from one node to another (or any point to its next “identical” point). So if w is the wavelength, then 1/2 = 30. So, w = 30 × 2 = 60 cm
5. The nature of fuse wire is (1) high resistance and low melting point.
(2) high resistance and high melting point.
(3) low resistance and high melting point.
(4) low resistance and low melting point
Answer is Option (1) for SSC MTS Physics MCQ
A fuse or fusable link works by opening an electrical circuit when the current becomes too high. As the current increases, the temperature of the wire increases. So a fuse wire should have a low melting point and should be connected in series with the appliance. Besides, it should have a comparatively high resistance.
6. In a railway track, two rails are joined end to end with a gap in between them because
(1) steel can be saved
(2) accidents due to contraction in winter can be avoided
(3) air-gaps are necessary for bearing the weight of running train
(4) accidents due to expansion in summer can be avoided.
Answer is Option (4) for SSC MTS Physics MCQ
The volume of materials changes depending on current temperature. Usually heat makes them expand, and cold leads them to contract. There have to be gaps to avoid strain on the tracks. The same applies in many other fields of engineering, i.e. bridge building.
7. Vehicle tyres are inflated properly
(1) to ensure smooth running.
(2) to allow the vehicle to take more load.
(3) to avoid skidding and to minimise friction
(4) to go fast and save fuel.
Answer is Option (3) for SSC MTS Physics MCQ
Under-inflated tyres create more friction with the road, increasing fuel consumption by up to ten per cent and are prone to skidding on either wet or slippery surfaces. Low pressures also lead to premature wear and risk of tyre blowout or bulging.
8. Refrigeration is a process which
(1) kills bacteria
(2) slows down the bacterial growth
(3) Inactivates the bacteria
(4) Plasmolyses the bacteria
Answer is Option (2) for SSC MTS Physics MCQ
Bacteria thrive in warm, moist conditions. Refrigeration allows the temperature to be lowered so far that food can be stored for days or even months. Keeping food cold (at or below 4°C) slows down bacterial growth which helps reduce the risk of foodborne illness.
9. Air coolers are more suitable for
(1) hot and humid climate
(2) hot and dry climate
(3) cool and humid climate
(4) cool and dry climate
Answer is Option (2) for SSC MTS Physics MCQ
An air cooler works on the simple principle of evaporation. It does not yield good results when humidity is high. On the contrary, the temperature of dry air can be dropped significantly through the phase transition of liquid water to water vapor (evaporation), which can cool air using much less energy than refrigeration.
10. A transformer
(1) converts DC to AC
(2) is used to decrease or increase AC voltage
(3) converts AC voltage to D.C. voltage
(4) converts electrical energy into mechanical energy
Answer is Option (2) for SSC MTS Physics MCQ
Transformers have made long-distance transmission of electric power a practical reality, as AC voltage can be “stepped up” and current “stepped down” for reduced wire resistance power losses along power lines connecting generating stations with loads. At either end (both the generator and at the loads), voltage levels are reduced by transformers for safer operation and less expensive equipment.
11. When hot-water is sprinkled on a hotter glass tumbler, it breaks because
(1) glass suddenly expands
(2) glass suddenly contracts
(3) water evaporates
(4) glass reacts chemically with water
Answer is Option (2) for SSC MTS Physics MCQ
If the poured liquid is relatively hotter or colder in comparison to the tumbler, it will break. When hot water is poured into a tumbler there is an uneven increase in the thermal expansion of the walls of the vessel. If the expansion is uneven enough and the strength of the glass is not strong enough, the tumbler breaks. However, if the poured water is colder in comparison to the tumbler, it breaks due to contraction and unequal temperature difference between the layers.
12. Electricity is transmitted over long distances
(1) it is fast
(2) there is less wastage of energy
(3) it is safer
(4) it is cheaper
Answer is Option (2) for SSC MTS Physics MCQ
Long distance means higher wastage of energy. So High-voltage direct-current (HVDC) technology is used for greater efficiency in very long distances. Electricity is transmitted at high voltages (110 kV or above) to reduce the energy lost in long-distance transmission.
13. The material used in the fabrication of a transistor is
(1) Aluminium
(2) Copper
(3) Silicon
(4) Silver
Answer is Option (3) for SSC MTS Physics MCQ
A transistor is a semiconductor device used to amplify and switch electronic signals and electrical power. The first transistors were made from germanium (Ge). Silicon (Si) types currently predominate but certain advanced microwave and high performance versions now employ the compound semiconductor material gallium arsenide (GaAs) and the semiconductor alloy silicon germanium (SiGe).
14. If there is a circular hole in a metal plate, what happens to the radius of the hole when the plate is heated?
(1) Increases
(2) Decreases
(3) Unchanged
(4) Depends upon the metal
Answer is Option (1) for SSC MTS Physics MCQ
When a metal plate with a circular hole at its centre is heated, definitely along with the areal expansion of the plate the diameter of the circular hole also increases. Using the differential equations of coefficients of expansions, we find that the hole radius increases at the same linear rate as the metal.
15. The velocity of sound in air
(1) decreases with increase of temperature
(2) increases with decrease of temperature
(3) does not depend on temperature
(4) decreases with decrease of temperature
Answer is Option (4) for SSC MTS Physics MCQ
Assuming air to be an ideal gas, the speed of sound c depends on temperature only, not on the pressure or density. As air temperature increases, so does the speed of sound and vice versa. This is due to the individual air particles having extra kinetic energy at higher temperatures and lesser at lower temperatures.
16. Electric current in a metal wire is due to the flow of—
(1) Electrons
(2) Protons
(3) Ions
(4) Holes
Answer is Option (1) for SSC MTS Physics MCQ
A solid conductive metal contains mobile, or free electrons, originating in the conduction electrons. When a metal wire is connected across the two terminals of a DC voltage source such as a battery, the source places an electric field across the conductor. The moment contact is made, the free electrons of the conductor are forced to drift toward the positive terminal under the influence of this field. The free electrons are therefore the charge carrier in a typical solid conductor.
17. The device which converts sound energy into electrical energy is called
(1) Amplifier
(2) Speaker
(3) Microphone
(4) Transmitter
Answer is Option (3) for SSC MTS Physics MCQ
A microphone converts sound energy to electrical energy this energy level is used as an output using same energy level amplified or it could be used to record those same energy output and pattern too be played again. Sound waves strike a plastic or thin metal diaphragm, causing in to move an attached coil within a strong magnetic field. The induced current duplicates the frequency of the sound wave.
18. The light rays used for eliminating bacteria
(1) X-rays
(2) infrared rays
(3) microwave radiation
(4) ultra-violet radiation
Answer is Option (4) for SSC MTS Physics MCQ
Ultraviolet radiation is used to kill microorganisms, molds and fungus in various environmental applications. UV sterilization is used for air-purification systems, water purification, aquarium and pond maintenance, laboratory hygiene and food and beverage protection.
19. Mud houses are cooler in summers and warmer in winters as compared to brick houses because
(1) mud is a good conductor
(2) mud is a bad conductor
(3) mud is a poor insulator
(4) evaporation of water causes cooling in summers and sunlight coming through holes causes warming in winters
Answer is Option (2) for SSC MTS Physics MCQ
The houses made of mud and thatched roofs are cool in summer and warm in winter as the thatched roof contains large amount of trapped air and also mud is a bad conductor of heat. In summer, the outside heat cannot enter the house and in winter, inside heat cannot flow outside.
20. After long periods of use, a grey spot develops on the inside of a bulb. This is because
(1) the tungsten filament evaporates and collects there
(2) the heat of the bulb scorches the glass at the top
(3) dust inside the bulb condenses on the top
(4) glass undergoes a change due to the heat
Answer is Option (3) for SSC MTS Physics MCQ
At high operating temperatures, tungsten evaporates from the filament and gradually forms a gray film on the inside of the bulb. The inert gas atoms collide with the evaporating tungsten, causing some of the tungsten atoms to return to the filament. Eventually, however, a thin spot develops in the filament. When this happens, the filament will break and the bulb fails.
21. Should cars have bumpers that collapse under impact?
(1) Yes, since the offending car should get damaged and pay for the mistake
(2) No, since it would be very expensive to get the car repaired
(3) No, since the colliding car would then ram into the occupants and kill them
(4) Yes, since they help to absorb the impact of a collision and keep the occupants safe
Answer is Option (4) for SSC MTS Physics MCQ
In automobiles, a bumper is the front-most or rearmost part, ostensibly designed to allow the car to sustain an impact without damage to the vehicle’s safety systems. They are not capable of reducing injury to vehicle occupants in high-speed impacts, but are increasingly being designed to mitigate injury to pedestrians struck by cars.
22. Ice cubes are added to a glass of pure water and a glass of pure alcohol. The ice would be
(1) at a higher level in water
(2) at a higher level in alcohol
(3) at the same level in both
(4) floating in alcohol and sinking in water
Answer is Option (1) for SSC MTS Physics MCQ
Density of water is approx 1g/ml; Density of Ice is approx 0.93 g/ml; and Density of 100% pure ethanol is 0.79 g/ml. So the density of ice cubes is lesser than water, but higher than alcohol. So it will float in water, but sink in alcohol. This can also be put as: The ice cube will float higher in water as compared to alcohol.
23. A person wears spectacles with concave lenses. It means that normally (when not using glasses), the image of distant objects is focused in his eyes
(1) behind the retina
(2) in front of the retina
(3) on the retina
(4) on the blind spot
Answer is Option (2) for SSC MTS Physics MCQ
A concave lens is used to correct short-sightedness (myopia). In myopia, images are formed in front of the retina, resulting in a blurred image. This occurs when the eye is relatively too long or the refractive powers of the cornea and lens of the eye are relatively too strong.
24. What is the principle of a ‘Life Jacket’?
(1) It provides oxygen to a drowning person
(2) It increases the volume of the person to keep him afloat
(3) It decreases the volume of the person to keep him afloat
(4) The person can sit on it like a raft
Answer is Option (2) for SSC MTS Physics MCQ
The upward-pushing force that keeps things afloat is called buoyancy. For an object to float it must be able to equal its own weight by displacing enough water. A life jacket is mainly filled with gas which has a very low mass. As such when worn by a person, it acts to significantly increase their volume for only a very small increase in their mass. This means that they have a lower density than normal which increases their buoyancy and helps them to float.
25. Myopia is the same as
(1) Near sightedness
(2) Astigmatism
(3) Presbyopia
(4) Long sightedness
Answer is Option (1) for SSC MTS Physics MCQ
Myopia or near-sightedness is condition of the eye where the light that comes in does not directly focus on the retina but in front of it. This causes the image that one sees when looking at a distant object to be out of focus but in focus when looking at a close object. It is corrected by using concave lenses.
26. Sun’s heat reaches us by
(1) Conduction
(2) Convection
(3) Radiation
(4) Reflection
Answer is Option (3) for SSC MTS Physics MCQ
Radiation is a process in which energetic particles or energetic waves travel through vacuum, or through matter-containing media that are not required for their propagation. The sun’s rays reach us in the form of electromagnetic radiation. This type of radiation covers a wide spectrum (that is a wide range of frequencies), but those from the sun are mainly infra-red, visible, and ultra-violet.
27. A sphere rolls down on two inclined planes of different angles but same height, it does so
(1) in the same time
(2) with the same speed
(3) in the same time with the same speed
(4) in the same time with the same kinetic energy
Answer is Option (2) for SSC MTS Physics MCQ
The velocity of the sphere at the bottom depends only on height and acceleration due to gravity. Both these values are constants. Therefore, the velocity at the bottom remains the same whichever inclined plane the sphere is rolled. However, the sphere will take longer time to reach the bottom of the inclined plane having the smaller inclination. The kinetic energy will be the same. What will differ is time taken to reach the bottom.
28. In heating frozen foods in sealed pouches in a microwaves, why do you first poke holes in the pouch?
(1) To prevent the steam pressure from bursting open the pouch
(2) To allow the heat to get into the food through the hole
(3) To allow the microwaves to get into the food through the holes
(4) To allow the aroma of the food to come out through the holes
Answer is Option (1) for SSC MTS Physics MCQ
Anything in a tight skin or shell can explode in a microwave because the water inside can expand and burst through. It is for this very reason that before microwaving, the skin of potatoes should be pricked, winter squash and similar vegetables should be cut in half, eggs should be taken out of shells and holes should be poked in the plastic wrap or sealed pouches of frozen packaged foods.
29. A vacuum cleaner works on the principle of pressure difference. On the moon it will
(1) work as efficiently as on the earth
(2) not work at all
(3) work with reduced efficiency
(4) work with increased efficiency
Answer is Option (2) for SSC MTS Physics MCQ
Vacuum cleaners work by creating a lower pressure just inside the opening which touches the floor. By creating a low pressure inside the machine, higher air pressure in the room pushes its way into the vacuum cleaner, taking the dirt with it. Because there is no, or very little, atmosphere on the moon, we can’t create a lower or higher gas pressure inside and outside the machine, so dirt cannot be sucked up from the ground. Nothing happens when a vacuum cleaner is turned on the moon.
30. A rubber ball is dropped from a height of 2 metres. To what height will it rise if there is no loss of energy/velocity after rebounding ?
(1) 4 metres
(2) 3 metres
(3) 2 metres
(4) 1 metre
Answer is Option (3) for SSC MTS Physics MCQ
The potential energy of a body when raised through height h is given by mgh. Each time, a normal rubber ball hits the floor, it loses one-fifth of its total energy and the rebound height is proportional to energy, so each bounce will rebound to four-fifth of the previous bounce. But, the question states that there is no loss of energy/velocity after rebounding. So the height of 2 metres will be maintained.
31. When a pail of water is swung in a vertical circle, the water does not fall out at the top of the loop when the speed is
(1) below a certain minimum value irrespective of amount of water in the pail
(2) above a certain minimum value irrespective of amount of water in the pail
(3) above a certain minimum value depending on amount of water in the pail
(4) below a certain minimum value depending on amount of water in the pail
Answer is Option (2) for SSC MTS Physics MCQ
When a pail of water is swung in a vertical circle, the water does not fall out at the top of the loop when the speed is great enough. At every point in the circle the water tries to fall vertically out due to the force of gravity g but also tries to move in a straight line due to its circular motion. If the velocity is large enough the water will not drop out of the bucket far enough before it is moved round the circle. The value of g does not depend upon the object’s mass.
32. Who enunciated the laws of planetary motion?
(1) Nicolaus Copernicus
(2) Johannes Kepler
(3) Isaac Newton
(4) Galileo
Answer is Option (2) for SSC MTS Physics MCQ
Kepler’s laws of planetary motion are three scientific laws describing orbital motion, each giving a description of the motion of planets around the Sun. The laws are: the orbit of every planet is an ellipse with the Sun at one of the two foci; a line joining a planet and the Sun sweeps out equal areas during equal intervals of time; and the square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit.
33. The radiant energy having lowest energy is
(1) gamma rays
(2) UV rays
(3) visible light
(4) microwave radiation
Answer is Option (4) for SSC MTS Physics MCQ
The parts of the electromagnetic spectrum, arranged from highest energy to lowest, are gamma rays, Xrays, ultraviolet light, visible light, infrared light, microwaves, and radio waves.
34. Which one of the following has the highest value of specific heat?
(1) Glass
(2) Copper
(3) Lead
(4) Water
Answer is Option (4) for SSC MTS Physics MCQ
The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius. The specific heat of water is 1 calorie/gram °C = 4.186 joule/gram °C which is higher than any other common substance. As a result, water plays a very important role in temperature regulation. The specific heat per gram for water is much higher than that for a metal.
35. A microscope used in pathological laboratories forms
(1) magnified, virtual, erect image
(2) diminished, real and erect image
(3) magnified, virtual and inverted image
(4) diminished, virtual and erect image
Answer is Option (3) for SSC MTS Physics MCQ
A microscope is an instrument that produces a clear magnified image of an object viewed through it. A basic microscope is made up of two converging lenses. The first lens creates a real image which serves as the object for the second lens, and the image created by the second lens is the one a viewer sees. The final image is virtual and is inverted compared to the original object.
36. The magnifying power of an astronomical telescope can be decreased by
(1) decreasing the focal length of the eyepiece
(2) increasing the focal length of the eyepiece
(3) increasing the focal length of the objective
(4) None of these
Answer is Option (2) for SSC MTS Physics MCQ
The magnifying power (M) of astronomical telescope is given by
M = focal length of objective / focal length of eye piece .
This expression shows that in order to obtain high magnification, focal length of object must be large and that of eye piece should be small. Similarly, for decreased magnification, focal length of eye piece should be increased.
37. Necessary element of change in solar energy to electric energy
(1) Berillium
(2) Silicon
(3) Tantelium
(4) Pure Copper
Answer is Option (2) for SSC MTS Physics MCQ
A small solar electric or photovoltaic (PV) converts solar energy into electrical energy. Solar cells consist of semiconductor materials which work on photoelectric effect. Silicon remains the most popular material for solar cells.
38. Which of the following events occurred first ?
(1) Albert Einstein propounded the General Theory of Relativity
(2) Max Planck unveiled the Quantum Theory
(3) Marconi first transmitted a wireless signal
(4) Madame Marie Curie became the first woman Nobel Prize winner
Answer is Option (2) for SSC MTS Physics MCQ
General Theory of Relativity: a theory of gravitation developed by Einstein in the years 1907–1915; Quantum Theory of Max Planck: 1900; Transmission of wireless signal by Marconi: first Atlantic wireless transmission on December 11, 1901; and Madame Curie becoming the first woman Nobel Prize winner: shared her 1903 Nobel Prize in Physics with her husband Pierre Curie.
39. The audio signals of TV are
(1) Amplitude modulated
(2) Frequency modulated
(3) Unmodulated
(4) Velocity modulated
Answer is Option (2) for SSC MTS Physics MCQ
In analogue television, the sound portion of a broadcast is invariably modulated separately from the video. Most commonly, the audio and video are combined at the transmitter before being presented to the antenna, but in some cases separate aural and visual antennas can be used. In almost all cases, standard wideband frequency modulation is used.
40. Red light is used for signals because it has
(1) long wavelength
(2) high intensity
(3) high frequency
(4) low refraction in the medium
Answer is Option (1) for SSC MTS Physics MCQ
Red is the international colour of stop signs and stop lights on highways and intersections because it is scattered the least by air molecules. The effect of scattering is inversely related to the fourth power of the wavelength of a colour. Red has the highest wavelength of all the colours and is able to travel the longest distance through fog, rain, and the alike.
41. Woollen cloth protects the body from cold because
(1) it is a good conductor of heat
(2) it is a poor conductor of heat
(3) external heat rays enter into
the body through the woolen cloth
(4) it reflects heat
Answer is Option (2) for SSC MTS Physics MCQ
It is just because woolen clothes have fibres and between those fibres air is trapped which reduces heat loss. It reduces heat loss because it is an insulator or poor conductor of heat.
42. The owl can see most clearly in total darkness because
(1) it has squint eyes
(2) it has large eyes with orbs directed forward, giving it binocular sight
(3) it has light bulbs in its eyes provided by nature
(4) it produces infrasonic sounds
Answer is Option (2) for SSC MTS Physics MCQ
Because of their eyes, an owl can see much better in the dark than we can. Owls have very large eyes which maximize light gathering in conditions of minimum light, thereby enabling them to see at night. The orbs of their eyes are directed forward, giving them binocular vision. They are able to see their prey in a three-dimensional manner. However, an owl’s eye cannot rotate.
43. Damp clothes are dried in spin dryers by the action of
(1) centripetal forces
(2) centrifugal forces
(3) central forces
(4) non central forces
Answer is Option (2) for SSC MTS Physics MCQ
The spin dryer is probably the most familiar centrifuge. The spin dryer of a washing machine removes excess water from the clothing by rotating at a high speed. The high speed of rotation creates a high centrifugal force for the water in the clothing which causes it to be pulled to the outside of the spinning portion of the washing machine and away from the clothes.
44. Which colour of light shows maximum deviation when passed through a prism ?
(1) Red
(2) Green
(3) Violet
(4) Yellow
Answer is Option (3) for SSC MTS Physics MCQ
When passed through a prism violet colour of light shows maximum deviation. As white light passes through a prism, the violet component, having the minimum wave length observes the maximum refractive index for the prism and, thus, gets deviated to the maximum extent.
45. Tape recorder should not be kept near one of the following things :
(1) Clock
(2) Magnet
(3) Electrical switchboard
(4) Radio
Answer is Option (2) for SSC MTS Physics MCQ
The cassette tape contains a magnetic strip wound around two spools. Tiny magnetic particles are randomly scattered throughout the tape. A tape recorder should not be kept near a magnet as the latter can cause the magnetic material to be pushed and pulled out of place. Rearranging the magnetic particles erases the sound.
46. When a person sitting on a swing stands up on the swing, the frequency of oscillation
(1) decreases
(2) increases
(3) becomes infinite
(4) does not change
Answer is Option (2) for SSC MTS Physics MCQ
In Simple Harmonic Motion, the frequency of the oscillation (f) is the number of oscillations per second which is expressed as f = 1/T where T is the time period (the time for the oscillator to complete one cycle).
Now, when a person sitting on a swing stands up on the swing, the effective length of the swing decreases. When length decreases, the time period also decreases. Since frequency of oscillation is inversely proportion to time period, it increases in the present case of man standing up on the swing.
47. Night photography and photography in mist and fog are possible using
(1) ultra-violet radiation
(2) infra-red radiation
(3) microwave radiation
(4) gamma radiation
Answer is Option (2) for SSC MTS Physics MCQ
Infrared is used in night vision equipment when there is insufficient visible light to see. Night vision devices operate through a process involving the conversion of ambient light photons into electrons which are then amplified by a chemical and electrical process and then converted back into visible light.
48. The blue colour of water in the sea is due to
(1) absorption of other colours except blue by water molecules
(2) scattering of blue light by water molecules
(3) reflection of blue light by impurities in sea water
(4) reflection of blue sky by sea water
Answer is Option (1) for SSC MTS Physics MCQ
Almost all sunlight that enters the ocean is absorbed, except very close to the coast. The red, yellow, and green wavelengths of sunlight are absorbed by water molecules in the ocean. The reason the ocean is blue is due to the absorption and scattering of light. The blue wavelengths of light are scattered, similar to the scattering of blue light in the sky but absorption is a much larger factor than scattering for the clear ocean water. In seawater, absorption is strong in the red and weak in the blue, thus red light is absorbed quickly in the ocean leaving blue.
49. Which of the following is a good conductor of heat but a bad conductor of electricity ?
(1) Celluloid
(2) Rubber
(3) Asbestos
(4) Mica
Answer is Option (4) for SSC MTS Physics MCQ
Good conductors of heat are good conductors of electricity. Mica is an exception which although being a good conductor of heat and a bad conductor of electricity. It is commonly used in insulation of electricity between high heat generating transistors and their heat sink and or chassis to prevent grounding out of component and to assist in the transfer of the generated heat to the heat sink or chassis for dissipation.
50. An aircraft can perform aerobatic maneuvers in a vertical loop because of
(1) gravity
(2) centripetal force
(3) weight
(4) centrifugal force
Answer is Option (1) for SSC MTS Physics MCQ
It happens because of gravity. A key feature of super maneuvering aircrafts is a high thrust-to-weight ratio; that is, the comparison of the force produced by the engines to the aircraft’s weight, which is the force of gravity on the aircraft. A thrust-to-weight ratio greater than 1:1 is a critical threshold, as it allows the aircraft to maintain and even gain velocity in a nose-up attitude; such a climb is based on sheer engine power, without any lift provided by the wings to counter gravity, and has become crucial to aerobatic maneuvers in the vertical loop.
51. A photostat machine works on
(1) electromagnetic image making
(2) electrostatic image making
(3) magnetic image making
(4) thermal image making
Answer is Option (2) for SSC MTS Physics MCQ
A photocopier uses electrostatic charge to produce a copy. The original document is placed onto a sheet of glass. An image of this page is projected onto a positively charged drum. The drum has a coating which conducts electricity when light falls on it. The parts of the drum which are lit by the projected image lose their electrostatic charge when they start to conduct.
52. Steam at 100⁰C causes more severe burns than water at 100°C because
(1) steam has no specific heat capacity
(2) steam has latent heat of vaporization
(3) water has no specific heat capacity
(4) water has latent heat of fusion
Answer is Option (2) for SSC MTS Physics MCQ
It is because steam releases its latent heat as it condenses, which is substantial. The heat of vaporization of steam is over 2000 J per gram. And when it releases that it’s then 100 degree water, the same as boiling water.
53. To measure the speed of an approaching car a police officer shines
(1) light waves on it
(2) microwaves on it
(3) radio waves on it
(4) ultra high frequency waves on it
Answer is Option (3) for SSC MTS Physics MCQ
Radar, which stands for radio detection and ranging, is a system that uses reflected radio waves to detect objects and measure their distance and speed. For example, police use radar to calculate the speed of cars.
54. During hot weather, the fan produces a feeling of comfort. This is because
(1) fan supplies cool air
(2) fan cools the air
(3) our perspiration evaporates rapidly
(4) conductivity of air increases
Answer is Option (3) for SSC MTS Physics MCQ
Fans make the air more comfortable for two reasons: (a) by moving the air, they blow away body heat and evaporate sweat, cooling the body, and (b) they also mix the cooler air near the floor with the warmer air by people’s faces.
55. Forged documents are detected by
(1) ultraviolet rays
(2) infra-red rays
(3) beta rays
(4) gamma rays
Answer is Option (1) for SSC MTS Physics MCQ
Old postcards, books, signs, photos and other paper products made before the late 1930s rarely glow under a black light. Chemical bleaches and dyes used in modern papers will fluoresce under ultraviolet light. Knowing this helps to detect forged documents and distinguish reproductions in all types of ephemera.
56. Rainbow is seen after rain because of hanging molecules of water which act as
(1) lenses
(2) mirrors
(2) prisms
(4) slabs
Answer is Option (2) for SSC MTS Physics MCQ
In optics, a prism is a transparent optical element with flat, polished surfaces that refract light. In a rainbow, raindrops in the air act as tiny prisms. Light enters the raindrop, reflects off of the side of the drop and exits. In the process, it is broken into a spectrum just like it is in a triangular glass prism.
57. Which of the following is a result of Surface tension ?
(1) Gravitational pull
(2) Viscosity
(3) Capillary action
(4) Radiation
Answer is Option (3) for SSC MTS Physics MCQ
Capillary action is the result of adhesion and surface tension. Adhesion of water to the walls of a vessel will cause an upward force on the liquid at the edges and result in a meniscus which turns upward. The surface tension acts to hold the surface intact, so instead of just the edges moving upward, the whole liquid surface is dragged upward.
58. Lightning is caused due to
(1) electric power
(2) electric discharge
(3) electric leak
(4) electric pressure
Answer is Option (2) for SSC MTS Physics MCQ
Lightning is a discharge of electrical energy that builds up within a storm. The charges develop because a storm causes air to move around which rubs against itself to generate electrical charges. Eventually the charge increases to a point where the electricity can flow through the air. Once an electric discharge starts it provides a better path for more electrical flow than normal air due to ionization which results in a sudden, large and fast discharge.
59. Sprayer functions on
(1) Bernouli’s principle
(2) Archemede’s principle
(3) Pascal’s law
(4) Floatation principle
Answer is Option (1) for SSC MTS Physics MCQ
Bernoulli’s principle states that as the speed of a moving fluid (liquid or gas) increases, the pressure within the liquid decreases. In the case of a sprayer, when the plunger is pushed in, the air flows at a high velocity through a nozzle, creating a region of low pressure above the metal tube. The higher pressure of the atmospheric air causes the liquid to rise up to the metal tube and come out as spray.
60. The device which transfer the signal from low resistance region to high resistance region is
(1) diode
(2) transistor
(3) capacitor
(4) inductor
Answer is Option (2) for SSC MTS Physics MCQ
A transistor transfers a signal from a low resistance to high resistance. It has two PN-junctions: one junction is forward biased and other junction is reverse biased having low resistance path and high resistance path respectively. The weak signal is introduced in the low resistance, circuit and output is taken from the high resistance circuit.
61. A bird sitting on a high tension electric wire does not get electrocuted because
(1) it has high resistance
(2) the body is earthed
(3) it does not form a closed path for the flow of current
(4) its feet are good insulators
Answer is Option (3) for SSC MTS Physics MCQ
Electricity travels from a place of high voltage to low voltage, just as water travels from high elevation to low elevation. A bird, or any living thing, that touches a wire (where electricity is moving from high voltage to low voltage) and also touches the ground (a place with no voltage) creates a path that allows the electricity to travel through that body and into the place with no voltage. When electricity travels through a body in this fashion, electrocution takes place, and the bird can die.
62. The wall of a dam is broader at the base
(1) because streamlining is required
(2) to withstand pressure that increases with depth
(3) to withstand pressure that increases in a horizontal plane
(4) to withstand pressure that is increased with atmospheric pressure
Answer is Option (2) for SSC MTS Physics MCQ
Dams are built broader at the base for two reasons. The first is because it needs to be stable enough to support the dam, and two, the bottom of the dam needs to be able to deal with the increased pressure of the water, as you get further down. Particular to dams, at the lower part of the structure the lower levels of water are at higher pressure than the upper levels of the water.
63. Which of the following is arranged in order of decreasing conductivity?
(1) Copper, Aluminium, Steel, Silver
(2) Aluminium, Silver, Copper, Steel
(3) Copper, Silver, Aluminium, Steel
(4) Silver, Copper, Aluminium, Steel
Answer is Option (4) for SSC MTS Physics MCQ
Copper ; 9% less conductive than silver; aluminium is 10% less conductive than copper; while steel is the least conductive among the given options. The most electrically conductive metal is silver.
64. Which of the following liquids is most viscous?
(1) Oil
(2) Milk
(3) Water
(4) Petrol
Answer is Option (1) for SSC MTS Physics MCQ
Informally, viscosity is the quantity that describes a fluid’s resistance to flow. It is dependent on temperature. Viscosity of the different fluids (in cP) is as follows: Edible Oil: 20 to 60; Milk: approximately 1.0; Water: 0.894; and Petrol: around 0.82 to 0.95 cP.
65. Radio activity is due to
(1) unstable nucleus
(2) stable nucleus
(3) stable electronic configuration
(4) stable electronic configuration
Answer is Option (1) for SSC MTS Physics MCQ
Radioactivity is caused by unstable nuclei trying to become stable by emitting particles and or energy. The nuclei of radioactive substances are unstable due to an unstable ratio of protons to neutrons.
66. Which conservation principle is applicable in the case of the motion of a rocket?
(1) Conservation of mass
(2) Conservation of charge
(3) Conservation of momentum
(4) Conservation of energy
Answer is Option (3) for SSC MTS Physics MCQ
The motion of a rocket is an application of Newton’s third law of motion and law of conservation of linear momentum. The operation of a rocket illustrates the conservation of momentum. Just before launching, the momentum of the rocket is zero. When the rocket is fired, it forces a jet of hot gases with a high velocity through the nozzle. The jet of gases acquires a momentum downwards. Hence, the rocket acquires a momentum of equal magnitude in opposite direction. Thus the rocket moves upwards.
67. It is easier to carry two buckets of water in one hand each, than to carry only one in one hand because
(1) weights of buckets are balanced
(2) centre of gravity falls within the body
(3) centre of gravity and centre of equilibrium fall within the feet
(4) resultant weight of buckets is zero
Answer is Option (3) for SSC MTS Physics MCQ
When the buckets containing equal amount of water are held in both hands, weight is spaced out more evenly than it would be if one had to carry a single bucket. For balancing the weight, the centre of gravity and the centre of equilibrium should fall, in the present case, within the feet.
68. The surface tension of water on adding detergent to it
(1) increases
(2) decreases
(3) no change
(4) becomes zero
Answer is Option (2) for SSC MTS Physics MCQ
In the solid and liquid phase, water molecules are bonded to each other by virtue of an interaction between hydrogen atoms on one molecule and the oxygen atom of another — the process is referred to as “hydrogen bonding.” The result is a kind of “skin” on liquid water’s surface. When Soaps and detergents are added to water, they weaken the strength of the skin by interfering with hydrogen bonding between water molecules because the polar end of the soap or detergent is also attracted to the water.
69. In a refrigerator, the cooling system should always be
(1) at the top
(2) at the bottom
(3) at the middle
(4) can be anywhere
Answer is Option (2) for SSC MTS Physics MCQ
The compressor is the motor (or engine) of the cooling system. It is normally at the bottom of the refrigerator in the back. The compressor runs whenever the refrigerator thermostat calls for cooling.
70. Which of the following is optical illusion?
(1) Rainbow
(2) Earthshine
(3) Halo
(4) Mirage
Answer is Option (4) for SSC MTS Physics MCQ
A mirage is a naturally occurring optical illusion or phenomenon in which light rays are bent due to refraction in layers of air of varying density. The image usually is upside down, enhancing the illusion that the sky image seen in the distance is really a water or oil puddle acting as a mirror.
71. An athlete runs before long jump to get advantage on
(1) Inertia of motion
(2) Frictional force
(3) Moment of a force
(4) Principle of moments
Answer is Option (1) for SSC MTS Physics MCQ
An athlete does so to build up forward momentum so that when he jumps he already has a forward motion that would be greater than that of a jump made from standing in one spot. He needs forward momentum to get a good long jump and the best way is to have a running start. In this way, he gets advantage in terms of inertia of motion which is the tendency of an object to resist a change in motion.
72. In sunlight a rose appears red. In green light, the same rose appears
(1) red
(2) black
(3) green
(4) yellow
Answer is Option (2) for SSC MTS Physics MCQ
Any object which allows light to pass through it is known as a transparent object. The colour of any transparent object is the colour of the light transmitted by it. A red rose appears red in white light because it absorbs all colours except red. However, when seen in green light, it looks black because the red colour of the rose is absorbed by the green light.
73. The sparkling of a diamond is due to
(1) total internal reflection of light
(2) interference of light
(3) polarisation of light
(4) refraction of light
Answer is Option (1) for SSC MTS Physics MCQ
Diamonds sparkle because of the total internal reflection of light. Diamonds have a very high refractive index, meaning they slow light down much more than glass; and if cut in the right manner, the angles of incidence can be made so that light seems to get ‘trapped’ within the diamond giving it it’s sparkly appearance.
74. Ocean currents are an example of
(1) convection
(2) conduction
(3) insulation
(4) radiation
Answer is Option (1) for SSC MTS Physics MCQ
Heat is transferred by convection in numerous examples of naturally occurring fluid flow, such as: wind, oceanic currents, and movements within the Earth’s atmosphere. Winds and ocean currents are examples of convection currents. Convection serves to transfer heat from the surplus to deficit heat zones and set the oceanic circulation in motion.
75. If a copper wire is increased to double its length, its resistance will become
(1) four times
(2) one–fourth
(3) double
(4) half
Answer is Option (3) for SSC MTS Physics MCQ
There is a direct relationship between the amount of resistance encountered by charge and the length of wire it must traverse. After all, if resistance occurs as the result of collisions between charge carriers and the atoms of the wire, then there is likely to be
more collisions in a longer wire. An object of uniform cross section has a resistance proportional to its resistivity and length and inversely proportional to its cross-sectional area.
76. In a diesel engine the high temperature needed to ignite the fuel is achieved by
(1) using heat from exhaust
(2) the battery
(3) compressing air in the cylinders
(4) an electrical spark
Answer is Option (3) for SSC MTS Physics MCQ
Diesel engines use the heat of compressed air to ignite the fuel (intakes air, compresses it, then injects fuel). Diesel engines need high compression ratios to generate the high temperatures required for fuel auto ignition.
77. Waves that are required for long distance wireless communication are
(1) Infrared rays
(2) Ultraviolet rays
(3) Radio waves
(4) Microwaves
Answer is Option (3) for SSC MTS Physics MCQ
Wireless communication is the transfer of information between two or more points that are not connected by an electrical conductor. With radio waves distances can be short, such as a few metres for television remote control, or as far as thousands or even millions of kilometres for deep-space radio communications.
78. Rise of oil a wick is due to
(1) density of the oil
(2) viscosity of the oil
(3) surface tension of the oil
(4) pressure of the oil
Answer is Option (3) for SSC MTS Physics MCQ
The phenomenon of rise or fall of liquid in a capillary tube is called capillarity. Oil rises through a wick due to capillarity. The narrow pores in the threads of a wick act like tiny capillaries, through which oil rises. Capillary action is the result of adhesion and surface tension.
79. The radiation initially produced in fluorescent tube is
(1) infrared
(2) ultraviolet
(3) microwaves
(4) X-rays
Answer is Option (2) for SSC MTS Physics MCQ
The primary radiation that is initially produced within a fluorescent lamp is analogous to that emitted by a low pressure mercury lamp. Fluorescent lamps produce UV radiation by ionizing low-pressure mercury vapour. A phosphorescent coating on the inside of the tubes absorbs the UV and converts it to visible light.
80. The ‘four stroke petrol engine’ is based on
(1) Carnot-cycle
(2) Otto-cycle
(3) Diesel-cycle
(4) Boyle’s-cycle
Answer is Option (2) for SSC MTS Physics MCQ
A four-stroke engine (also known as four-cycle) is an internal combustion engine in which the piston completes four separate strokes—intake, compression, power, and exhaust—during two separate revolutions of the engine’s crankshaft, and one single thermodynamic cycle. The earliest of these to be developed is the Otto cycle engine developed in 1876 by Nikolaus August Otto in Cologne, Germany, after the operation principle described by Alphonse Beau de Rochas in 1861.
81. It is dangerous to observe Solar eclipse with naked eyes because
(1) Infrared radiations from sun burn our retina
(2) Ultraviolet radiations from Sun burn our retina
(3) All radiations from sun initiate chemical reactions in eyes
(4) Cosmic rays reach eyes more during the eclipse
Answer is Option (2) for SSC MTS Physics MCQ
The solar radiation that reaches the surface of Earth ranges from ultraviolet (UV) radiation at wavelengths longer than 290 nm to radio waves in the meter range. The tissues in the eye transmit a substantial part of the radiation between 380 and 1400 nm to the light-sensitive retina at the back of the eye. The concern over improper viewing of the Sun during an eclipse is for the development of “eclipse blindness” or retinal burns.
82. These waves cannot be transmitted through vacuum
(1) Light
(2) Sound
(3) Heat
(4) Electromagnetic
Answer is Option (2) for SSC MTS Physics MCQ
Sound is a mechanical wave that is created by vibrating objects and propagated through a medium from one location to another. Because mechanical waves rely on particle interaction in order to transport their energy, they cannot travel through regions of space that are void of particles. That is, mechanical waves cannot travel through a vacuum.
83. A gap is left between two rails of a railway track to accommodate…………. of the metal.
(1) areal expansion
(2) volume expansion
(3) liner expansion
(4) apparent expansion
Answer is Option (3) for SSC MTS Physics MCQ
The volume of materials changes depending on current temperature. Usually heat makes them expand, and cold leads them to contract. To a first approximation, the change in length measurements of an object (“linear dimension” as opposed to, e.g., volumetric dimension) due to thermal expansion is related to temperature change by a “linear expansion coefficient”. It is the fractional change in length per degree of temperature change.
84. If an ordinary glass tube and a glass capillary tube are both dipped in a beaker of water, water rises in
(1) both
(2) only the glass tube
(3) only the capillary tube
(4) neither
Answer is Option (1) for SSC MTS Physics MCQ
The rise or fall of liquid due to capillarity in a beaker of water depends upon the radius of the bore of the tube (s) which is/are dipped into it. The narrower the bore of the tube, the greater is the rise or fall of the liquid in the tube. So in this case, water will rise in both the glass tube and the glass capillary tube.
85. ‘Hydraulic brakes’ work on the principle of
(1) Pascal’s law
(2) Thomson’s law
(3) Newton’s law
(4) Bernoulli’s theorem
Answer is Option (1) for SSC MTS Physics MCQ
Pascal’s law states that when there is an increase in pressure at any point in a confined fluid, there is an equal increase at every other point in the container. According to Pascal’s principle, in a hydraulic system a pressure exerted on a piston produces an equal increase in pressure on another piston in the system. If the second piston has an area 10 times that of the first, the force on the second piston is 10 times greater, though the pressure is the same as that on the first piston. This effect is exemplified by the hydraulic press, based on Pascal’s principle, which is used in such applications as hydraulic brakes.
86. Stars in the sky appear to twinkle due to
(1) a series of refractions
(2) a series of reflections
(3) a surface tension phenomenon
(4) multiple diminishing brightness
Answer is Option (1) for SSC MTS Physics MCQ
The movement of air (sometimes called turbulence) in the atmosphere of Earth causes a series of refractions which makes the starlight to get slightly bent as it travels from the distant star through the atmosphere down to us on the ground. This means that some of the light reaches us directly and some gets bent slightly away. To our eyes, this makes the star seem to twinkle.
87. A pilot has to release the bomb to hit a target
(1) right above the target
(2) beyond the target
(3) before the target
(4) None of these
Answer is Option (3) for SSC MTS Physics MCQ
According to Newton’s first law, an object that is at rest will stay at rest unless an unbalanced force acts upon it and an object that is in motion will not change its velocity unless an unbalanced force acts upon it. So the bomb carries the inertia of the aircraft and so has to be launched before the target so that it can hit it on time. Assuming the plane continues to fly straight forward, the plane will be directly over the target when the bomb hits.
88. Parabolic mirrors are used in
(1) Car headlights
(2) Driving mirrors
(3) Dentists mirrors
(4) Shaving mirrors
Answer is Option (1) for SSC MTS Physics MCQ
A parabolic reflector (mirror) transforms an incoming plane wave traveling along the axis into a spherical wave converging toward the focus. Since the principles of reflection are reversible, parabolic reflectors can also be used to project energy of a source at its focus outward in a parallel beam, used in devices such as spotlights and car headlights.
89. Red is used as an emergency or danger signal as
(1) it is a striking colour
(2) its wavelength is the longest
(3) it is scattered
(4) it has very high energy
Answer is Option (2) for SSC MTS Physics MCQ
The effect of scattering is inversely related to the fourth power of the wavelength of a colour. Red has the highest wavelength of all the colours and is able to travel the longest distance through fog, rain, and the alike.
90. Bats can sense obstacles because they produce
(1) supersonic sound waves
(2) ultrasonic sound waves
(3) infrasonic sound waves
(4) micro sound waves
Answer is Option (2) for SSC MTS Physics MCQ
The reason that bats use ultrasound is because it has such a high frequency and it has a low diffraction or it bends less. They use this sound to do a couple of things like to catch their prey and also just to get around. The method of doing such tasks is called echolocation. They make a sound and wait for it to bounce back to hear it. If they hear it come faster in a particular area than the rest of the sounds then they know that something is near.
91. The resistance of the human body (dry condition) is of the order of
(1) \(\displaystyle {{10}^{1}}\) Ohm
(2) \(\displaystyle {{10}^{2}}\) Ohm
(3) \(\displaystyle {{10}^{3}}\) Ohm
(4) \(\displaystyle {{10}^{4}}\) Ohm
Answer is Option (4) for SSC MTS Physics MCQ
The level of current passing through the human body is directly related to the resistance of its path through the body. Under dry conditions, the resistance offered by the human body may be as high as 100,000 Ohms. Wet or broken skin may drop the body’s resistance to 1,000 Ohms.
92. The sharpness of a television image is termed as its
(1) Clarity
(2) Colour
(3) Resolution
(4) Graphics
Answer is Option (3) for SSC MTS Physics MCQ
Resolution is an umbrella term that describes the detail an image holds. The term applies to raster digital images, film images, and other types of images. The display resolution of a digital television, computer monitor or display device is the number of distinct pixels in each dimension that can be displayed.
93. Small bubbles are perfectly spherical because of
(1) Gravity
(2) Pressure
(3) Viscosity
(4) Surface tension
Answer is Option (4) for SSC MTS Physics MCQ
Surface tension is responsible for the shape of liquid droplets. Although easily deformed, droplets of water tend to be pulled into a spherical shape by the cohesive forces of the surface layer. In the absence of other forces, including gravity, drops of virtually all liquids would be perfectly spherical. The spherical shape minimizes the necessary “wall tension” of the surface layer according to Laplace’s law.
94. The final image in a simple microscope is
(1) real, diminished and inverted
(2) real, magnified and erect
(3) virtual, magnified and erect
(4) virtual, diminished and erect
Answer is Option (3) for SSC MTS Physics MCQ
A basic microscope is made up of two converging lenses. The first lens creates a real image which serves as the object for the second lens, and the image created by the second lens is the one a viewer sees. The final image is magnified, virtual and is inverted compared to the original object.
95. Two rods, one of copper and other of steel, experience the same upthrust when placed inwater. Thus, both have
(1) equal volume
(2) equal weight
(3) equal density
(4) equal mass
Answer is Option (1) for SSC MTS Physics MCQ
When a body is placed in water, the upthrust or buoyant force acting on it depends upon the following factors:
(i) Volume of the body submerged in the liquid – (V), or volume of the liquid displaced – (V);
(ii) Density of the liquid – (d); and
(iii) Acceleration due to gravity In-line.
Since in the present question, we can assume g to be a constant and know that steel and copper have different densities, the only case in which they can have similar upthrust will be because of their volumes.
96. A single fixed pulley is used to draw water from a well because
(1) efficiency is 100%
(2) velocity ratio is low
(3) mechanical advantage is high
(4) force is applied in a convenient direction
Answer is Option (4) for SSC MTS Physics MCQ
A single fixed pulley is used to lift a load upwards by applying efforts downwards. The load and effort move equal distance but in opposite directions. This is convenient as to apply effort in downward direction. They are used on flag-poles and to draw water from a well.
97. A light year is a measure of :
(1) Speed
(2) Velocity
(3) Distance
(4) Time
Answer is Option (3) for SSC MTS Physics MCQ
A light-year is a unit of length equal to just under 10 trillion kilometres (or about 6 trillion miles). As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in a vacuum in one Julian year. Note that the light-year is a measure of distance (rather than, as is sometimes misunderstood, a measure of time).
98. A device which is used to limit the current in an electrical circuit is called a
(1) Grid
(2) Fuse
(3) Hub
(4) Conductor
Answer is Option (2) for SSC MTS Physics MCQ
A fuse places a limit on the amount of current that can be drawn by an electric circuit by opening (blowing or melting) when the current exceeds a preset limit. This protects the circuit and the surroundings from fire or damage in the case of an overload or short circuit.
99. Hypermetropia or longsight can be corrected by using :
(1) Bifocal lenses
(2) Cylindrical lenses
(3) Concave lenses
(4) Convex lenses
Answer is Option (4) for SSC MTS Physics MCQ
It can be corrected with convex lenses in eyeglasses or contact lenses. Convex lenses have a positive dioptic value, which causes the light to focus closer than its normal range.
100. Stars appear twinkling because of ……… of light.
(1) Reflection
(2) Scattering
(3) Emission
(4) Absorption
Answer is Option (2) for SSC MTS Physics MCQ
The stars’ light must travel through the Earth’s multi-layered atmosphere, and as it does so it is refracted (bent) multiple times and in random directions. The phenomenon of random refraction appears to make the star wink as though it is in motion. It is this action that our eyes translate as twinkling. When the light itself enters the air – or atmosphere – it is scattered, with the scattering depending on the air temperature with warm air causing less bends and colder air causing more.
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