Strengthen your concepts with Physics MCQ for SSC CHSL. Our objective questions and answers cover essential topics like Mechanics, Electricity, Magnetism, and Thermodynamics. Practicing these SSC CHSL physics questions will help you understand the exam pattern, improve accuracy, and boost your confidence for the real-time examination.
Practice the following Objective Questions for CHSL Exam
1. When milk is churned, the cream separates from it due to:
(1) Frictional force
(2) Centrifugal force
(3) Gravitational force
(4) Viscous forces
Answer is Option (2) for the SSC CHSL Physics MCQ
The extraction of cream happens because of the work of centrifugal force which works outward. The separation of cream from milk is based on the fact that when liquids of different specific gravities revolve around the same centre at the same distance with the same angular velocity, a greater centrifugal force is exerted on the heavier liquid than on the lighter one. Milk can be regarded as two liquids of different specific gravities, the serum and the fat.
2. Moving electric charge produces :
(1) magnetic field
(2) sound waves
(3) light rays
(4) heat waves
Answer is Option (1) for the SSC CHSL Physics MCQ
An electric charge always produces an electric field, regardless of speed, and a moving charge generates a magnetic field. An electric current passing through a conductor produces a magnetic field because it has many charges in motion.
3. The S.I. unit of electric charge is :
(1) ampere
(2) coulomb
(3) e.s.u
(4) kelvin
Answer is Option (2) for the SSC CHSL Physics MCQ
The SI unit of quantity of electric charge is the coulomb, which is equivalent to about 6.242×1018 e (e is the charge of a proton). Hence, the charge of an electron is approximately -1.602×10-19 C. The coulomb is defined as the quantity of charge that has passed through the cross section of an electrical conductor carrying one ampere within one second.
4. Light beam which is highly directional is called:
(1) eraser
(2) grazer
(3) maser
(4) laser
Answer is Option (4) for the SSC CHSL Physics MCQ
Laser light is very different from normal light. It is very directional, has a very tight beam and is very strong and concentrated. The light released is monochromatic. It contains one specific wavelength of light (one specific colour).
5. Permissible noise level at Residential area during night time is :
(1) 45 dB
(2) 55 dB
(3) 75 dB
(4) 80 dB
Answer is Option (1) for the SSC CHSL Physics MCQ
As per the norm, the permissible noise level in residential areas is 45 db during night time, 55 db during day and in commercial areas it is 55 db during night and 65 db during day.
6. Energy in reflected light :
(1) does not depends on the angle of incidence
(2) increases with the increase in angle
(3) decreases with the increase in angle of incidence
(4) becomes maximum for angle of incidence equal to 45°
Answer is Option (2) for the SSC CHSL Physics MCQ
Reflected waves are simply those waves that are neither transmitted nor absorbed, but are reflected from the surface of the medium they encounter. The amount of incident-wave energy that is reflected from a surface depends on the nature of the surface and the angle at which the wave strikes the surface. The amount of wave energy reflected increases as the angle of incidence increases. The reflection of energy is the greatest when the wave is nearly parallel to the reflecting surface.
7. Which colour of light shows maximum deviation when passed through a prism ?
(1) White
(2) Red
(3) Violet
(4) Green
Answer is Option (3) for the SSC CHSL Physics MCQ
The angle of deviation, by which the light of a particular wavelength gets deviated on passing through a medium, depends upon the refractive index of the medium, as encountered by that light wavelength. The smaller the wavelength of the passing light, the greater is the refractive index observed. As white light passes through a prism, the violet component, having the minimum wavelength observes the maximum refractive index for the prism and, thus, gets deviated to the maximum extent.
8. The best material for the core of a transformer is
(1) stainless steel
(2) mild steel
(3) hard steel
(4) soft iron
Answer is Option (4) for the SSC CHSL Physics MCQ
Iron has a very large magnetic response: it greatly amplifies an applied magnetic field. The transformer’s ability to transfer energy depends on the strength of the magnetic field, so it is very helpful if the field is amplified. The input energy can then be lower while still having the same effect.
9. In AC circuits, AC meters measure
(1) mean values
(2) rms values
(3) peak values
(4) mean square values
Answer is Option (2) for the SSC CHSL Physics MCQ
Voltages and currents for AC circuits are generally expressed as rms (root mean square) values. For a sine wave, the relationship between the peak and the rms average is: rms value = 0.707 peak value.
10. When a light wave is reflected from a mirror, there is a change in its
(1) frequency
(2) amplitude
(3) wavelength
(4) velocity
Answer is Option (2) for the SSC CHSL Physics MCQ
When a light wave is reflected from an object, it changes not only its amplitude but also its phase according to the properties of the object at a particular point. The velocity and momentum are just reversed in another direction.
11. Solar energy is due to
(1) fusion reactions
(2) fission reactions
(3) combustion reactions
(4) chemical reactions
Answer is Option (1) for the SSC CHSL Physics MCQ
Nuclear Fusion Reaction is the process which is responsible for the sun to radiate energy in the form of light and heat commonly known as solar energy. Fusion occurs when hydrogen atoms fuse together under extreme heat and pressure to create a denser helium atom releasing, in the process, colossal amounts of energy.
12. The width of depletion layer of a P-N junction
(1) decreases with light doping
(2) increases with heavy doping
(3) is independent of applied voltage
(4) is increased under reverse bias
Answer is Option (4) for the SSC CHSL Physics MCQ
The total width of the depletion region is a function of applied reverse-bias and impurity concentration. Forward bias decreases the depletion region width whilst reverse bias increases it.
13. The working of a rocket is based on the principle of:
(1) Conservation of momentum
(2) Conservation of mass
(3) Conservation of energy
(4) Conservation of angular momentum
Answer is Option (1) for the SSC CHSL Physics MCQ
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.
14. A fuse wire is made of:
(1) an alloy of tin and copper
(2) an alloy of tin and lead
(3) an alloy of tin and aluminium
(4) an alloy of nickel and chromium
Answer is Option (2) for the SSC CHSL Physics MCQ
Electric fuse wire is an alloy made of tin (63 % & lead 37 %. The cross sectional area determines the melting point at a certain current. Alloys (e.g. tin/ lead) are used due to their ‘eutectic’ action -i.e. the resulting combination of good conductivity (due to the tin) with a low melting point due to the lead).
15. The energy that can harness eat stored below the earth’s surface is known as ;
(1) thermal energy
(2) nuclear energy
(3) tidal energy
(4) geo-thermal energy
Answer is Option (4) for the SSC CHSL Physics MCQ
Geothermal energy is thermal energy generated and stored in the Earth. The Geothermal energy of the Earth’s crust originates from the original formation of the planet (20%) and from radioactive decay of minerals (80%).Current worldwide installed capacity is 10,715 megawatts (MW), with the largest capacity in the United States (3,086 MW), Philippines, and Indonesia.
16. The temperature of boiling water in a steam engine may be high because :
(1) there are dissolved substances in water
(2) there is low pressure inside the boiler
(3) there is high pressure inside the boiler
(4) the fire is at very high temperature
Answer is Option (3) for the SSC CHSL Physics MCQ
In the boiler of a steam engine, there is a firebox where coal is shoveled into. The coal is kept burning at a very high temperature, and is used to heat the boiler to boil water producing a high pressure steam. The high-pressure steam expands and exits the boiler via steam pipes into the steam reservoir, the steam is then controlled by a slide valve to move into a cylinder to push the piston. The pressure of the steam energy pushing the piston turns the drive wheel in a circle, creating motion for the locomotive.
17. An instrument used to measure humidity is:
(1) Anemometer
(2) Hygrometer
(3) Thermometer
(4) Pyrheliometer
Answer is Option (2) for the SSC CHSL Physics MCQ
A hygrometer is an instrument used for measuring the moisture content in the environment. Humidity measurement instruments usually rely on measurements of some other quantity such as temperature, pressure, mass or a mechanical or electrical change in a substance as moisture is absorbed.
18. Fat can be separated from milk in a cream separator because of:
(1) Cohesive force
(2) Gravitational force
(3) Centripetal force
(4) Centrifugal force
Answer is Option (4) for the SSC CHSL Physics MCQ
The separation of fat from milk is based on the fact that when liquids of different specific gravities revolve around the same centre at the same distance with the same angular velocity, a greater centrifugal force is exerted on the heavier liquid than on the lighter one.
19. A transformer works with
(1) alternating current only
(2) direct current only
(3) both AC and DC
(4) any signal
Answer is Option (1) for the SSC CHSL Physics MCQ
Transformer, a device that transfers electric energy from one circuit to another, usually with a change in voltage. Transformers work only with a varying electric current, such as alternating current (AC). Transformers are important in the distribution of electric power.
20. In the Earth, the weight of a body is maximum at the
(1) North Pole
(2) South Pole
(3) Equator
(4) Surface
Answer is Option (4) for the SSC CHSL Physics MCQ
If the mass of the body is m, the force of attraction of the earth, or the weight w of the body, is given by the Newton’s law of gravitation as w = mg, with acceleration due to gravity g \(\displaystyle =\frac{{GM}}{{{{R}^{2}}}}\) where M and R are the mass and radius of the Earth respectively. Since weight of the body is directly proportional to g, the weight of the body is maximum at the centre of the earth and zero at the centre of the earth.
21. The technique of collecting information about an object from a distance without making physical contact with it is
(1) Remote sensing
(2) Remote control
(3) Remote accessing
(4) Space shuttle
Answer is Option (1) for the SSC CHSL Physics MCQ
Remote sensing is the acquisition of information about an object or phenomenon without making physical contact with the object. In modern usage, the term generally refers to the use of aerial sensor technologies to detect and classify objects on Earth by means of propagated signals (e.g. electromagnetic radiation emitted from aircraft or satellites).
22. The head mirror used by ENT doctors is
(1) Concave
(2) Convex
(3) Plane
(4) Plano-convex
Answer is Option (1) for the SSC CHSL Physics MCQ
A head mirror is mostly used for examination of the ear, nose & throat. It comprises a circular concave mirror, with a small hole in the middle, and is attached to a head band. The mirror is worn over the physician’s eye of choice, with the concave mirror surface facing outwards and the hole directly over the physician’s eye, providing illumination like a ring light.
23. Direct conversion of solar energy with the use of a photo voltaic cell results in the production of
(1) Optical energy
(2) Electrical energy
(3) Thermal energy
(4) Mechanical energy
Answer is Option (2) for the SSC CHSL Physics MCQ
A solar cell (also called a photovoltaic cell) is an electrical device that converts the energy of light directly into electricity by the photovoltaic effect. It is a form of photoelectric cell (in that its electrical characteristics—e.g. current, voltage, or resistance— vary when light is incident upon it) which, when exposed to light, can generate and support an electric current without being attached to any external voltage source.
24. A man inside an artificial satellite feels weightlessness because the force of attraction dueto earth is
(1) zero at that place
(2) is balanced by the force of attraction due to moon
(3) equal to the centripetal force
(4) non-effective due to particular design of the satellite
Answer is Option (1) for the SSC CHSL Physics MCQ
Earth attracts all bodies towards its centre. The acceleration produced in the body due to attraction force of earth on it is called the acceleration due to gravity. A astronaut in a satellite experiences weightlessness because two forces act on him: gravitational pull and centrifugal force which cancel out each other with the resultant force acting on him being zero.
25. When a detergent is added to pure water, its surface tension
(1) increases
(2) decreases
(3) remains constant
(4) becomes infinite
Answer is Option (2) for the SSC CHSL Physics MCQ
When Soaps and detergents are added to water, they weaken the strength of the skin on the water’s surface due to surface tension by interfering with hydrogen bonding between water molecules. It happens because the polar end of the soap or detergent is also attracted to the water, thereby decreasing the surface tension.
26. Ultra violet light of Sun’s radiation is prevented from reaching the earth’s atmosphere by the layer of
(1) Oxygen
(2) Hydrogen
(3) Ozone
(4) Helium
Answer is Option (3) for the SSC CHSL Physics MCQ
The ozone layer is a layer in Earth’s atmosphere containing relatively high concentrations of ozone (\(\displaystyle {{O}_{3}}\)). The layer absorbs 97–99% of the Sun’s mediumfrequency ultraviolet light (from about 200 nm to 315 nm wavelength), which potentially damages exposed life forms on Earth.
27. White clothes are cooler than black ones because they
(1) absorb all the light that reaches them
(2) reflect all the light that reaches them
(3) will not allow the light to penetrate
(4) cool the sunlight completely
Answer is Option (2) for the SSC CHSL Physics MCQ
The coolness and warmth associated with clothes is because of their reflective or absorptive capacities. White clothes are good reflectors of light, thereby keeping the body cool. The opposite is the case with black clothes.
28. The primary colours in photography are
(1) Red, Blue, Yellow
(2) Red, Yellow, Green
(3) Red, Blue, Green
(4) Blue, Yellow, Green
Answer is Option (1) for the SSC CHSL Physics MCQ
There are three primary colours of Red, Green and Blue (RGB). As these are mixed they form lighter colours, and when all three are mixed together they appear as white. Artists and graphic designers, who work with paintings and illustrations more than they do with photographs, often refer to Red, Yellow and Blue as the primary colours.
29. A concave lens always forms
(1) a real image
(2) a virtual image
(3) an image type which depends on object characteristics
(4) an image type which depends on lens curvature
Answer is Option (2) for the SSC CHSL Physics MCQ
Concave lens always form the virtual and erect image and the image is always diminished. Convex lens forms real image as well as virtual image. It forms both enlarged image and the diminished image.
30. The blue colour of sky is due to
(1) reflection of sunlight
(2) refraction of sunlight
(3) scattering of shorter wavelengths of sunlight in the atmosphere
(4) scattering of longer wavelengths of sunlight in the atmosphere
Answer is Option (3) for the SSC CHSL Physics MCQ
The blue colour of the sky is caused by the scattering of sunlight off the molecules of the atmosphere. This scattering, called Rayleigh scattering is more effective at short wavelengths (the blue end of the visible spectrum). Therefore the light scattered down to the earth at a large angle with respect to the direction of the sun’s light is predominantly in the blue end of the spectrum.
31. Metal tea pots have wooden handles because
(1) wood is a bad conductor of heat
(2) it prevents electric shock
(3) it gives beauty to the pots
(4) it is hygienic
Answer is Option (1) for the SSC CHSL Physics MCQ
Wood is a bad conductor of heat due to the arrangement of its molecules. As the molecules of wood are far from each other, they cannot pass heat through them.
32. Ozone layer above the surface of Earth provides a shield against
(1) X-rays
(2) Ultra-violet rays
(3) Gamma rays
(4) Infra-red rays
Answer is Option (2) for the SSC CHSL Physics MCQ
The Ozone layer absorbs 97–99% of the Sun’s medium-frequency ultraviolet light (from about 200 nm to 315 nm wavelength), which potentially damages exposed life forms on Earth.
33. The Newton’s First Law is also called as
(1) Law of moments
(2) Law of inertia
(3) Law of energy
(4) Law of momentum
Answer is Option (2) for the SSC CHSL 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 this law is known as the law of inertia.
34. If we want to calculate the pressure of a liquid at the bottom of a vessel, the quantity which is not required to determine it, is
(1) Height of the liquid column
(2) Surface area of the bottom of the vessel
(3) Density of the liquid
(4) Acceleration due to gravity at the bottom of the vessel
Answer is Option (2) for the SSC CHSL Physics MCQ
The pressure exerted by a static fluid depends only upon the depth of the fluid, the density of the fluid, and the acceleration of gravity. The pressure in a static fluid arises from the weight of the fluid and is given by the expression P(static fluid) = dgh, where d= fluid density, g= acceleration due to gravity and h= depth of fluid. Static fluid pressure does not depend on the shape, total mass, or surface area of the liquid.
35. The water from a hand pump is warm in winter because
(1) Our body is cold in winter and the water appears to be warm
(2) The temperature inside the earth is higher than the atmospheric temperature
(3) The pumping process causes friction which warms up the water
(4) Inside water comes out and absorbs heat from the environment
Answer is Option (2) for the SSC CHSL Physics MCQ
In winter, the outside temperature is lower than that of water flowing out of the pump, and therefore, the water is warm. Whereas in summer, the outside temperature is higher than the water of the pump, and therefore, it feels cold.
36. A water tank appears shallower when it is viewed from top due to
(1) rectilinear propagation of light
(2) reflection
(3) total internal reflection
(4) refraction
Answer is Option (4) for the SSC CHSL Physics MCQ
This phenomenon is because of refraction of light. The lines of sight intersect at a higher position than where the actual rays originated. This causes the water to appear shallower than it really is. The depth that the water appears to be when viewed from above is known as the apparent depth.
37. For a ray of light to suffer total internal reflection it has to pass from :
(1) glass to water
(2) water to glass
(3) air to water
(4) air to glass
Answer is Option (3) for the SSC CHSL Physics MCQ
Total internal reflection is an optical phenomenon that happens when a ray of light strikes a medium boundary at an angle larger than a particular critical angle with respect to the normal to the surface. This can only occur where light travels from a medium with a higher [n1 =higher refractive index] to one with a lower refractive index [n2 =lower refractive index]. Total internal reflection can be seen at the air-water boundary.
38. A stone is dropped from the roof of a house towards the ground. The kinetic energy of the stone will be maximum:
(1) just after it is dropped
(2) when it is just on the half-way
(3) just before it touches the ground
(4) when it touches the ground
Answer is Option (3) for the SSC CHSL Physics MCQ
When an object reaches the ground it has its maximum value of kinetic energy just before touching the ground. Since kinetic energy + potential energy= Constant; so on reaching ground the potential energy of an object becomes zero (0). The kinetic energy on reaching ground becomes maximum.
39. A black body can absorb radiations of ;
(1) lower wavelengths only
(2) intermediate wavelengths only
(3) higher wavelengths only
(4) all wavelengths
Answer is Option (4) for the SSC CHSL Physics MCQ
A black body is a theoretical object that absorbs 100% of the radiation that hits it. Therefore it reflects no radiation and appears perfectly black. At a particular temperature the black body would emit the maximum amount of energy possible for that temperature. This value is known as the black body radiation. It would emit at every wavelength of light as it must be able to absorb every wavelength to be sure of absorbing all incoming radiation.
40. Hydraulic machines work under the Principle of :
(1) Newton’s Law
(2) Joules Law
(3) Pascal’s Law
(4) Floatation Law
Answer is Option (3) for the SSC CHSL Physics MCQ
Hydraulic Machinery refer to machines and equipment which use high pressure fluid to accomplish any work in industrial fields. These machines work on the basis of Pascal’s Law which says, “The pressure, in a static hydraulic fluid in a closed system is everywhere the same”.
41. If we want to calculate the pressure of a liquid at the bottom of a vessel, the quantity which is not required to determine it, is
(1) Height of the liquid column
(2) Surface area of the bottom of the vessel
(3) Density of the liquid
(4) Acceleration due to gravity at the bottom of the vessel
Answer is Option (2) for the SSC CHSL Physics MCQ
The pressure exerted by a static fluid depends only upon the depth of the fluid, the density of the fluid, and the acceleration of gravity. Static fluid pressure does not depend on the shape, total mass, or surface area of the liquid.
42. The water from a hand pump is warm in winter because
(1) Our body is cold in winter and the water appears to be warm
(2) The temperature inside the earth is higher than the atmospheric temperature
(3) The pumping process causes friction which warms up the water
(4) Inside water comes out and absorbs heat from the environment
Answer is Option (2) for the SSC CHSL Physics MCQ
In winter, the outside temperature is lower than that of water flowing out of the pump, and therefore, the water is warm. Whereas in summer, the outside temperature is higher than the water of the pump, and therefore, it feels cold.
43. A water tank appears shallower when it is viewed from top due to
(1) rectilinear propagation of light
(2) reflection
(3) total internal reflection
(4) refraction
Answer is Option (4) for the SSC CHSL Physics MCQ
This phenomenon is because of refraction of light. The lines of sight intersect at a higher position than where the actual rays originated. This causes the water to appear shallower than it really is.
44. Ozone layer in the outer atmosphere helps us in
(1) reflecting radio waves and makes radio communication possible
(2) regulating the temperature of atmosphere
(3) absorbing cosmic ray particles
(4) absorbing U-V radiations
Answer is Option (4) for the SSC CHSL Physics MCQ
The ozone layer is a layer in Earth’s atmosphere containing relatively high concentrations of ozone (\(\displaystyle {{O}_{3}}\)) which absorbs 97–99% of the Sun’s medium-frequency ultraviolet light.
45. Water is used in hot water bags because
(1) It is easily obtained
(2) It is cheaper and is not harmful
(3) It has high specific heat
(4) It is easy to heat water
Answer is Option (3) for the SSC CHSL 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.
46. Water drops cannot stick to the oily surface due to
(1) lack of adhesive force
(2) surface tension
(3) cannot mix each other
(4) water is lighter than oil
Answer is Option (2) for the SSC CHSL Physics MCQ
The separation of oil and water is caused due to the difference in surface tension of the two liquids. The water molecules stick together tightly and does not mix with the oil because water molecules are attracted to each other very strongly, forming an invisible “skin” of surface tension around each drop.
47. Which of the following properties is generally found in nonmetals?
(1) Brittleness
(2) Conductivity
(3) Ductility
(4) Malleability
Answer is Option (1) for the SSC CHSL Physics MCQ
An important physical property of non metals is that they are brittle and hence cannot be beaten into sheets or drawn into wires. In other words, non-metals are non-malleable and non-ductile. Where stress is applied on non-metals, they shatter into pieces.
48. Match the following Process vs Changes:
Process
a. Evaporation
b. Sublimation
c. Freezing
d. Melting
Changes
1. Liquid into gas
2. Solid into liquid
3. Solid into gas
4. Liquid to Solid
(1) a – 1, b – 3, c – 4, d – 2
(2) a – 3, b – 1, c – 2, d – 4
(3) a – 2, b – 1, c – 4, d – 3
(4) a – 2, b – 1, c – 3, d – 4
Answer is Option (1) for the SSC CHSL Physics MCQ
Evaporation: the process by which water is converted from its liquid form to its vapor form (gas); Sublimation: the transition of a substance directly from the solid phase to the gas phase without passing through an intermediate liquid phase; Freezing: a phase transition in which a liquid turns into a solid when its temperature is lowered below its freezing point; and Melting: the process of heating a solid substance to a liquid.
49. Electro-static precipitator is used to control
(1) Chemical Pollutants
(2) Radio-active Pollutants
(3) Water Pollutants
(4) Air Pollutants
Answer is Option (4) for the SSC CHSL Physics MCQ
An Electrostatic precipitator is a particulate collection device that removes particles from a flowing gas (such as air) using the force of an induced electrostatic charge. They are useful in controlling air pollutants in particulate form. They are highly efficient filtration devices that minimally impede the flow of gases through the device and can easily remove fine particulate matter such as dust and smoke from the air stream.
50. Conversion of sound energy into electrical energy is done by
(1) Solar cell
(2) Gramophone
(3) Microphone
(4) Loudspeaker
Answer is Option (3) for the SSC CHSL Physics MCQ
Conversion of sound energy into electrical energy is done by microphone.
51. A small gap is left at the joints of rails in a railway track to
(1) avoid the tracks being distorted due to seasonal temperature variation
(2) avoid the heating of tracks to high temperature
(3) control the speed of train
(4) keep the rails equidistant
Answer is Option (1) for the SSC CHSL Physics MCQ
A small gap is left at the joints of rails in a railway track to provide space for the expansion of rail pieces when the temperature rises during summer.
52. Which of the following criterion is used for any metal to be used as a cooking material ?
(1) More specific heat
(2) More thermal conductivity
(3) Less thermal conductivity
(4) Less electrical conductivity
Answer is Option (3) for the SSC CHSL Physics MCQ
A metal to be used as a cooking material should have less thermal conductivity.
53. Least audible sound for most of the human ear is :
(1) 10.0 µ bar
(2) 0.0002 µ bar
(3) 0.005 µ bar
(4) 5.0 µ bar
Answer is Option (2) for the SSC CHSL Physics MCQ
Least audible sound for most of the human ear is 2× \(\displaystyle {{10}^{{-5}}}\) pascal. The generally accepted standard range of audible frequencies is 20 to 20,000 Hz.
54. Amount of water vapour (gaseous) in a given volume of air (cubic metre) is known as:
(1) Mixing ratio
(2) Relative humidity
(3) Absolute humidity
(4) Specific humidity
Answer is Option (3) for the SSC CHSL Physics MCQ
The relative humidity of air at a given temperature is the ratio of mass of water vapour actually present in a certain volume of air to the mass of water vapour required to saturate the same volume of air at the same temperature, multiplied by 100.
Absolute Humidity refers to the amount of water vapour present in unit volume of air, expressed in grams per cubic metre.
55. When a running car stops suddenly, the passengers tends to lean forward because of:
(1) centrifugal force
(2) inertia of rest
(3) inertia of motion
(4) gravitational force
Answer is Option (3) for the SSC CHSL Physics MCQ
When a running car stops suddenly, the passengers tend to lean forward due to inertia of motion. Inertia is that property of a body due to which it resists a change in its state of rest or of uniform motion.
56. Which of the following is a good conductor of heat but bad conductor of electricity ?
(1) mica
(2) asbestos
(3) celluloid
(4) paraffin wax
Answer is Option (1) for the SSC CHSL Physics MCQ
Mica is a good conductor of heat but bad conductor of electricity.
57. For which of the following substances, the resistance decreases with increase in temperature?
(1) Pure silicon
(2) Copper
(3) Nichrome
(4) Platinum
Answer is Option (3) for the SSC CHSL Physics MCQ
Nichrome has high resistance and it is called a resistor.
58. A solid needle placed horizontally on the surface of the water floats due to
(1) capillary action
(2) water pressure
(3) surface tension of water
(4) viscosity of water
Answer is Option (3) for the SSC CHSL Physics MCQ
A solid needle placed horizontally on the surface of water floats due to surface tension of water.
59. When hot liquid is poured into a thick glass tumbler, it cracks because glass :
(1) is a bad conductor of heat so only inner surface expands
(2) has high temperature coefficient of expansion
(3) has a very low specific heat
(4) has low temperature coefficient of expansion
Answer is Option (1) for the SSC CHSL Physics MCQ
When hot liquid is poured into a thick glass tumbler, it cracks because glass is a bad conductor of heat so only inner surface expands.
60. Hydro-electric power is a:
(1) non-renewable natural resource
(2) a mixture of renewable and non-renewable natural resource
(3) neither renewable nor non renewable resource
(4) renewable natural resource
Answer is Option (4) for the SSC CHSL Physics MCQ
Hydro-electric power is a renewable natural resource.
61. The oil in the wick of an oil lamp rises up due to:
(1) capillary action
(2) low viscosity of oil
(3) gravitational force
(4) pressure difference
Answer is Option (1) for the SSC CHSL Physics MCQ
The oil in the wick of an oil lamp rises up due to capillary action.
62. A drop of liquid assumes spherical shape because:
(1) Intermolecular forces are strong in liquids
(2) A sphere has the least suface area for a given volume
(3) A sphere has the largest surface area for a given volume
(4) Inter molecular forces are weak in liquids
Answer is Option (2) for the SSC CHSL Physics MCQ
A drop of liquid assumes spherical shape because a sphere has the least surface area for a given volume.
63. If cream is removed from milk, its density
(1) Increases
(2) Decreases
(3) Remains the same
(4) May increase or decrease
Answer is Option (1) for the SSC CHSL Physics MCQ
The density of pure fresh milk being on the average 1.032, while the density of fat globules is about 0.86. It follows that the removal of cream will increase the density, while the addition of water will decrease it.
64. Convex mirrors are used as a rear view mirror in motor cycles because
(1) it forms real image
(2) it forms erect (upright) image
(3) it forms smaller image as compared with object
(4) All of the above
Answer is Option (3) for the SSC CHSL Physics MCQ
It is because image formed by an convex mirror is always virtual, erect and smaller than the object.
65. The wall of a dam is made thicker at the bottom than at the top because the pressure exerted by the water on the wall
(1) depends on the thickness of the wall
(2) increases with height of the wall
(3) increases with depth of the wall
(4) depends on the area of the wall
Answer is Option (3) for the SSC CHSL Physics MCQ
Higher water pressure on the base of the dam needs greater strength to hold it back.
66. Full form of CFL used in place of electric bulbs is
(1) compact fluorescent lamp
(2) constantan filament lamp
(3) closed filament lamp
(4) closed fluorescent lamp
Answer is Option (1) for the SSC CHSL Physics MCQ
A compact fluorescent lamp (CFL) is a fluorescent lamp designed to replace an incandescent lamp; some types fit into light fixtures formerly used for incandescent lamps.
67. Indicate the false statement about the resistance of a wire
(1) it depends on material of wire
(2) it is directly proportional to the length of wire
(3) it is directly proportional to the area of cross-section of wire
(4) resistance of metallic wire increases with increase in temperature
Answer is Option (3) for the SSC CHSL Physics MCQ
The property of conductor due to which it opposes the flow of current through it is called Resistance. It is numerically equal to the ratio of potential difference across its ends to the current flowing through it. The SI unit of resistance is ohm.
68. Which electromagnetic radiation is used for satellite communication ?
(1) Ultraviolet
(2) Infrared
(3) Microwave
(4) Millimeter wave
Answer is Option (3) for the SSC CHSL Physics MCQ
Microwave electromagnetic radiation is used for satellite communication.
69. Solar cells work on the principle of
(1) photovoltaic effect
(2) photoelectric effect
(3) photoconductive effect
(4) photosynthesis
Answer is Option (1) for the SSC CHSL Physics MCQ
Solar cells work on the principle of photovoltaic effect.
70. Materials for rain proof coats and tents owe their water proof properties to
(1) Surface tension
(2) Viscosity
(3) Specific gravity
(4) Elasticity
Answer is Option (1) for the SSC CHSL Physics MCQ
Materials for rain proof coats and tents owe their water proof properties to Surface Tension. The surface of a liquid behaves like an elastic membrane and therefore, has a tendency to contract. This property of liquid is called Surface Tension.
71. X-rays region lies between
(1) Ultraviolet and visible region
(2) Visible and infra-red region
(3) Gamma-rays and ultraviolet region
(4) Short radio waves and long radio waves
Answer is Option (3) for the SSC CHSL Physics MCQ
X-rays region lies between Gamma rays and ultra violet region.
72. A star appears twinkling in the sky because of
(1) scattering of light by atmosphere
(2) reflection of light by atmosphere
(3) refraction of light by atmosphere
(4) diffraction of light by atmosphere
Answer is Option (3) for the SSC CHSL Physics MCQ
A star appears twinkling in the sky because of refraction of light by atmosphere. Light bends when it passes obliquely from one medium to another. This is called refraction of light.
73. A metal ball and a rubber ball, both having the same mass, strike a wall normally with the same velocity. The rubber ball rebounds and the metal ball does not rebound. It can be concluded that
(1) The rubber ball suffers greater change in momentum
(2) The metal ball suffers greater change in momentum
(3) Both suffer the same change in momentum
(4) The initial momentum of the rubber ball is greater than that of the metal ball
Answer is Option (1) for the SSC CHSL Physics MCQ
As per the question, the rubber ball rebounds while the metal ball does not. So if m and v be the mass and velocity respectively, the change in momentum of rubber ball = 2 mv (in magnitude).
However, the change in momentum of the metal ball = mv.
The rubber ball suffers almost twice the change in momentum as experienced by the metal ball.
74. What is a neuron ?
(1) Basic unit of energy
(2) Particle released during radioactivity
(3) The anti-particle of neutron
(4) Basic unit of nervous system
Answer is Option (4) for the SSC CHSL Physics MCQ
A neuron is a nerve cell that is the basic building block of the nervous system. Neurons are specialized to transmit information throughout the body. These highly specialized nerve cells are responsible for communicating information in both chemical and electrical forms.
75. Which of the following is not caused by atmospheric refraction of light ?
(1) Sun appearing red at sunset
(2) Twinkling of stars at night
(3) Sun appearing higher in the sky than it actually is
(4) Sun becoming visible two or three minutes before actual sunrise
Answer is Option (3) for the SSC CHSL Physics MCQ
The twinkling of stars and variation in size of the Sun are due to atmospheric refraction of light. Besides, refraction is also responsible for the sun to look during sunset and sunrise. It is also responsible for the sun becoming two or three minutes before actual sunrise. The sun appears higher or lower in the sky due to the changing position of the Earth relative to the Sun.
76. Matter waves are
(1) de Broglie waves
(2) Electromagnetic waves
(3) Transverse waves
(4) Longitudinal waves
Answer is Option (1) for the SSC CHSL Physics MCQ
In mechanics, matter waves or de Broglie waves reflects the wave–particle duality of matter. The de Broglie relations show that the wavelength is inversely proportional to the momentum of a particle and is also called de Broglie wavelength.
77. When the milk is churned vigorously the cream from it is separated out due to
(3) Centripetal force
(2) Gravitational force
(3) Frictional force
(4) Centrifugal force
Answer is Option (4) for the SSC CHSL Physics MCQ
The separation of cream from milk is based on the fact that when liquids of different specific gravity revolve around the same centre at the same distance with the same velocity, a greater centrifugal force is exerted on the heavier liquid than on the lighter one. Milk consists of two liquids of different specific gravity: fat and milk serum.
78. Gas thermometers are more sensitive than the liquid thermometers because the gases
(1) have large coefficient of expansion
(2) are lighter
(3) have low specific heat
(4) have high, specific heat
Answer is Option (1) for the SSC CHSL Physics MCQ
Gases are more sensitive to the temperature than liquids (such as mercury). That means gas expands more than the mercury for the same increase of temperature. Hence the gas thermometer is more sensitive than liquid (mercury) thermo-meter.
79. A man standing on a edge of a cliff throws a stone vertically upwards with a certain speed. He then throws another stone downwards with the same speed. Find the ratio of the speeds of the two stones when they hit the ground.
(1) 1 : 1
(2) 1 : 2
(3) 1 : 4
(4) Cannot be found from the given information.
Answer is Option (1) for the SSC CHSL Physics MCQ
The stone which is throws upward will have the same velocity of u at the point of its original position when it is falling down. Another stone is thrown downwards with u. So, the velocity of both the stones is equal at the original point. Hence both stone will hit the ground with same velocity. So the ratio between the speeds of two stones will be 1:1.
80. Dioptere is the unit of
(1) power of a lens
(2) focal length of a lens
(3) light intensity
(4) sound intensity
Answer is Option (1) for the SSC CHSL Physics MCQ
A dioptre or diopter, is a unit of measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of the focal length measured in metres (that is, 1/metres). It is thus a unit of reciprocal length.
81. When a stone is thrown in the calm water of a pond the waves produced on the surface of water in the pond are
(1) longitudinal
(2) transverse
(3) both longitudinal and transverse
(4) waves are not produced
Answer is Option (2) for the SSC CHSL Physics MCQ
The waves produced on the surface of water in the pond is an example of transverse waves as particles of the medium do not move along with the wave. Only the disturbance is carried forward. Another example of such waves is the vibrations of a string.
82. In a filament type light bulb most of the electric power consumed appears as
(1) visible light
(2) infra-red rays
(3) ultra-violet rays
(4) fluorescent light
Answer is Option (2) for the SSC CHSL Physics MCQ
When electricity is passed through the filament, the filament gets hot. Depending on the temperature of the filament, radiation is emitted from the filament. The filament’s temperature is very high, generally over 2,000°C. At this high temperature of 2,000°C, about 5 percent of the electrical energy converts into visible light and rest of it is emitted as heat or infrared radiation.
83. A white and smooth surface is
(1) good absorber and good reflector of heat
(2) bad absorber and good reflector of heat
(3) good absorber and bad reflector of heat
(4) bad absorber and bad reflector of heat
Answer is Option (2) for the SSC CHSL Physics MCQ
Shiny surfaces are poor absorbers of heat radiation and the best reflectors of heat radiation. Black surfaces are the best emitters and best absorber of heat radiation.
84. When a body is immersed in a liquid, the force acting on it is
(1) Upthrust
(2) Weight
(3) Mass
(4) Both (1) and (2)
Answer is Option (4) for the SSC CHSL Physics MCQ
According to the Principle of Flotation, when a body is immersed in a fluid, two forces act on it: (1) The weight of the body acting vertically downward through the centre of gravity of the body, and (2) The upthrust of the fluid acting vertically upward through the centre of gravity of the fluid displaced, i.e., centre of buoyancy. The upthrust is also termed as buoyant force.
85. When two semiconductors of pand n-type are brought in contact, they form p-n junction which acts like a/an
(1) Conductor
(2) Oscillator
(3) Rectifier
(4) Amplifier
Answer is Option (3) for the SSC CHSL Physics MCQ
P-n junction is a device which flows current in one direction when it is forward biased and when it is reverse biased it doesn’t flow any current through it. So it acts as an rectifier device to convert sinusoidal current to uni-direction. A rectifier is an electrical device that converts alternating current (AC), which periodically reverses direction, to direct current (DC), which flows in only one direction.
86. Ohm’s law is valid in case of
(1) semiconductor
(2) conductor
(3) superconductor
(4) insulator
Answer is Option (2) for the SSC CHSL Physics MCQ
Ohm’s law states that the current through a conductor between two points is directly proportional to the potential difference across the two points. It defines the relationship between the three fundamental electrical quantities: current, voltage, and resistance.
87. The Laser is a beam of radiations which are
(1) Non-coherent and monochromatic
(2) Coherent and monochromatic
(3) Non-coherent and non-monochromatic
(4) Coherent and non-monochromatic
Answer is Option (2) for the SSC CHSL Physics MCQ
Laser, an acronym for Light Amplification by Stimulated Emission of Radiation, creates a radiation beam that is coherent (in-phase). In a coherent light source, the amplitude of the radiated waves is added and results in a radiation beam of great intensity. It normally produces only one or two wavelengths. The single wavelength is called monochromatic radiation.
88. Centigrade and Fahrenheit temperatures are the same at
(1) 32°
(2) 40°
(3) –273°
(4) –40°
Answer is Option (4) for the SSC CHSL Physics MCQ
There is one point on the Fahrenheit and Celsius scales where the temperatures in degrees are equal. That is -400 Celsius or Fahrenheit.
89. If the phase difference between two points is 120° for a wave with velocity of 360 m/ and frequency 500 Hz, then path difference between the two points is
(1) 1 cm
(2) 6 cm
(3) 12 cm
(4) 24 cm
Answer is Option (4) for the SSC CHSL Physics MCQ
If v is the wave velocity and f is the frequency, wavelength (?) is given by:
λ = \(\displaystyle =\frac{v}{f}\)
So as per the question,
λ = 360/500 = 0.72
The path difference between two points is given by
\(\displaystyle \frac{\lambda }{{2\pi }}\times \phi =\frac{{0.72}}{{360}}\times 120=\)0.24 m = 24 cm
90. The word ‘insolation’ means
(1) matters which insulate
(2) incoming solar radiation
(3) insoluble matters
(4) None of the above
Answer is Option (2) for the SSC CHSL Physics MCQ
Insolation is the solar radiation that reaches the earth’s surface. It is measured by the amount of solar energy received per square centimeter per minute. Insolation affects temperature. The more the insolation, the higher is the temperature.
91. While ascending a hill, the driver of the vehicle keeps the gear ratio
(1) equal to 1
(2) less than 1
(3) greater than 1
(4) either equal to or greater than 1
Answer is Option (4) for the SSC CHSL Physics MCQ
While ascending a hill Gear Ratio should be “Either equal to or greater than 1?. Gear Ratio is the ratio between angular velocity of input gear to the angular velocity of output gear. It prevents the vehicle from stalling.
92. A moving neutron collides with a stationary a – particle. The fraction of the kinetic energy lost by the neutron is
It is possible to transform unpolarized light into polarized light. A light wave that is vibrating in more than one plane is referred to as unpolarized light. Polarized light waves are light waves in which the vibrations occur in a single plane. The process of transforming unpolarized light into polarized light is known as polarization.
94. The unit of Planck’s constant is
(1) \(\displaystyle Js\)
(2) \(\displaystyle J{{s}^{{-2}}}\)
(3) \(\displaystyle {\frac{J}{s}}\)
(4) \(\displaystyle J{{s}^{2}}\)
Answer is Option (1) for the SSC CHSL Physics MCQ
The Planck constant has dimensions of physical action; these are the same as those of angular momentum, i.e., energy multiplied by time, or momentum multiplied by distance. In SI units, the Planck constant is expressed in joule seconds (J·s) or (N·m·s).
95. If a wire of resistance R is melted and recast to half of its length, then the new resistance of the wire will be
(1) R/4
(2) R/2
(3) R
(4) 2R
Answer is Option (1) for the SSC CHSL Physics MCQ
Let the original length be L; area of cross-section be A; and the resistivity be ?.
So, R = ρ L2/A
We get R∝L2 (as volume of the wire remains the same when it is recasted)
Now the wire is melted and recasted to half of its length i.e. L′= L/2
Thus new resistance of wire R′= R \(\displaystyle \frac{{{{{\left( {{{L}^{‘}}} \right)}}^{2}}}}{{{{L}^{2}}}}\)
R′= R \(\displaystyle \frac{{{{{\left( {L/2} \right)}}^{2}}}}{{{{L}^{2}}}}\)
R′= \(\displaystyle \frac{R}{4}\) Thus, the new resistance is one-fourth of the original resistance.
96. Golden view of sea shell is due to
(1) Diffraction
(2) Dispersion
(3) Polarization
(4) Reflection
Answer is Option (3) for the SSC CHSL Physics MCQ
When a ray of light falls on sea shell, its small amount gets refracted (slightly polarized) and rest almost gets reflected back (fully polarized). So it gets a golden view because of polarization.
97. An object covers distance which is directly proportional to the square of the time. Its acceleration is
(1) increasing
(2) decreasing
(3) zero
(4) constant
Answer is Option (4) for the SSC CHSL Physics MCQ
When an object covers distance which is directly proportional to the square of the time, its acceleration is constant. This is seen in the cases of falling objects. This connection between time and distance was first observed by Galileo.
98. Rainbow is formed due to
(1) refraction and dispersion
(2) scattering and refraction
(3) diffraction and refraction
(4) refraction and reflection
Answer is Option (4) for the SSC CHSL Physics MCQ
A rainbow is an optical phenomenon that is caused by both reflection and refraction of light in water droplets resulting in a spectrum of light appearing in the sky. It is caused by light being refracted (bent) when entering a droplet of water, then reflected inside on the back of the droplet and refracted again when leaving it.
99. The boiling point of water decreases at higher altitudes is due to
(1) low temperature
(2) low atmospheric pressure
(3) high temperature
(4) high atmospheric pressure
Answer is Option (2) for the SSC CHSL Physics MCQ
At higher altitudes, the air pressure is decreased, which forces water’s boiling point to lower. The air pressure decreases with altitude because of the decrease in the density of air. The lowered boiling point of water requires an increase in cooking times or temperature.
100. In a particular system, the units of length, mass and time are chosen to be 10 cm, 10 g and 0.1 s respectively. The unit of force in this system will be equivalent to
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