150+ Physics MCQs (Important for Punjab & Haryana High Court Exam)

Friends, below is the list of important MCQs of Physics (collected from previous years competitive exams papers). Specially Designed for Punjab Haryana High Court Exam. This list will be helpful for all upcoming Punjab Govt. Exam. 

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Q-1 A cold soft drink is kept on balance. When the cap is opened, then the weight
(a) increases
(b) decreases
(c) first increase then decrease
(d) remains same

Q-2 When a red glass is heated in dark room it will seem
(a) black
(b) green
(c) yellow
(d) red

Q-3 How is the pressure cooker work?
(a) Heat cannot escape from the cooker
(b) Low pressure inside the cooker rises the boiling point of water
(c) High pressure inside the cooker rises the boiling point of water
(d) Steam inside the cooker makes food to cook with ease

Q-4 Which of the Following is/ are the unit of energy?
I. Calorie
II. Joule
III. Electric-volt
IV. Watt
Select the answer by using the codes given below?
(a) I, II, III and IV
(b) I, II and III-
(c) II III and IV
(d) Only IV

Q-5 A body lying at rest suddenly breaks into two parts of equal masses which starts moving. The parts will move in 
(a) opposite direction with equal speed
(b) opposite direction with unequal speed
(c) any direction with equal speed
(d) same direction with equal speed

Q-6 The most familiar form of radiant energy in sunlight that cause tanning and has the potential for causing melanoma in humans is called
(a) infra-red radiation
(b) visible radiation
(c) ultra-violet radiation
(d) microwave radiation

Q-7 Which one of the following planets is said to be “twin sister” of the Earth?
(a) Mercury
(b) Venus
(c) Mars
(d) Jupiter

Q-8 Which one among the following satellites is used to reflect the radio-signals back to the Earth?
(a) Natural satellite
(b) Active satellite
(c) Passive satellite
(d) None of these

Q-9 Consider the following statements.
I. Atom bomb is based upon the principle of uncontrolled nuclear fusion.
II. Hydrogen bomb is based upon the principle of uncontrolled nuclear fusion.
III. Nuclear reactor is based upon the principle of uncontrolled nuclear fusion.
Which of the statements given above is/are correct?
(a) I, II and III
(b) I and III
(c) II and III
(d) Only II

Q-10 A coin immersed in water pond appears to be raised when view from the top. What is this due to?
(a) Total internal reflection of light
(b) Refraction of light
(c) Scattering of light
(d) Reflection of light

Q-11 Telescopes are placed in space to view distant galaxies primarily to
(a) get closer to the observed objects
(b) avoid the absorption of light or other radiations in the atmosphere of the Earth
(c) avoid light pollution from the Earth’s populated areas
(d) avoid steering the telescope against the Earth’s motion

Q-12 The phenomenon of bursting of hydrogen balloon is based on
(a) Charle’s law
(b) Boyle’s law
(c) Henry’s law
(d) Bernoulli’s theorem

Q-13 A solid sphere, disc and solid cylinder all of same mass and made of same material are allowed to roll down (from rest) on incline plane then
(a) disc will reach the bottom first
(b) solid sphere will reach the bottom first
(c) solid cylinder will reach the bottom first
(d) all of them will reach the bottom at the same time

Q-14 Who among the following gave the first experimental value of G?
(a) Cavendish
(b) Brook Taylor
(c) Copernicus
(d) Albert Einstein

Q-15 Why is the machine function well with lubricant?
(a) Because of surface tension of the lubricant
(b) Because of viscosity of the lubricant
(c) Lubricant removes moisture
(d) Lubricant induces inertia of machine

Q-16 Arrange the following electromagnetic waves according to their decreasing energy and select the correct answer
(a) IR, UV-rays, X-rays, y-rays
(b) y-rays, X-rays, UV-rays, IR
(c) y-rays, UV-rays , X-rays, IR
(d) IR, y-rays, UV-rays, X-rays

Q-17 If there were no gravity, which of the following will not be there for a fluid?
(a) Viscosity
(b) Pressure
(c) Archimede’s upward thrust
(d) Surface tension

Q-18 During wind storm, the roofs of houses covered with Gl Sheets may be blown off because
(a) Wind creates low pressure over the roof
(b) Wind creates high pressure over the roof
(c) Roofs are not tightly bound
(d) None of the above

Q-19 In nuclear reaction which one of the following is conserved?
(a) Atomic number
(b) Mass number
(c) Atomic number, mass number and energy
(d) None of the above

Q-20 Consider the following materials
I. Bronze
II. Graphite
III.Dirty water
IV. Concrete
Which of the following materials given above are conductors?
(a) I, II, III and IV
(b) I, II and III
(c) II and III
(d) II and IV

Q-21 Who gave the first evidence of Big-bang theory?
(a) Edwin Hubble
(b) Stephen Hawking
(c) S Chandrasekhar
(d) Albert Einstein

Q-21 Which one of the following will have the maximum cohesive force?
(a) Liquid
(b) Gas
(c) Fluid
(d) Solid

Q-22 Consider the following statements
I.If cyan and yellow coloured circles are intersected, the intersected area will have green.
II.If red and green coloured circles intersect, the intersected will have magenta.
Which of the statements given above is/are correct?
(a) Only I
(b) Only II
(c) Both I and II
(d) Neither I nor II

Q-23 A planet is moving around the sun in an elliptical orbit. Its speed is 
(a) Same at all points of the orbit
(b) Maximum when it is farthest from the sun
(c) Maximum when it is nearest to the sun
(d) None of the above

Q-24 Which of the following are electromagnetic waves?
I. X-rays II. Visible light III. IR-rays IV. Alpha rays
Select the correct answer using the codes given below
(a) I, II, III and IV
(b) I, II and III
(c) II and III
(d) II and IV

Q-25 The temperature of a body is an indicator of
(a) average kinetic energy of the molecules of body
(b) the total velocity of the molecules of body
(c) the total potential energy of the molecules of body
(d) average total energy of the molecules of body

Q-26 Which one among the following rays has minimum wavelength?
(a) Cosmic rays
(b) Gamma rays
(c) X-rays
(d) Ultra-violet rays

Q-27 Which of the following statements is/are true?
1. The angle of the axis in relation to the planer in which the earth revolves around the sun is not constant.
2. The amount of energy given off by the sun changes with the transparency of the atmosphere. Select the correct answer using the codes given below
(a) Only 1
(b) Only 2
(c) Both 1 and 2
(d) Neither 1 nor 2

Q-28 Select the correct statement from the following
I.Radioactive decay obeys the law of exponential.
II.Electrons orbiting the nucleus are responsible for the radioactivity.
III.Half life period is greater than mean life period.
IV.After disintegration radiocarbon is converted to C-14.
Select the correct answer using the codes given below
(a) I, II, III and IV
(b) I, II and III
(c) I and III
(d) I and IV

Q-29 By which one of the following, an old written material which cannot be read easily, can be read?
(a) a- rays
(b) y- rays
(c) X-rays
(d) IR- rays

Q-30 Which one of the following is not an amorphous substance?
(a) Glass
(b) Polymer
(c) Rubber
(d) Copper

Q-31 A person standing at the middle point of a wooden ladder which starts slipping between a vertical wall and the floor of a room, While continuing to remain in a vertical plane. The path traced by a person standing at the middle point of the slipping ladder is
(a) a straight line
(b) a elliptical line
(c) a circular path
(d) a parabolic path

Q-32 Which of the factors given below is/are responsible for the weightlessness while orbiting the Earth, in space?
I. Acceleration
II. Zero gravity
Select the correct answer using the codes
(a) Only I
(b) Only II
(c) Both I and II
(d) Neither I nor II

Q-33 An objects is placed at the focus of a concave mirror. The image will be
(a)Real, inverted, same size at the focus
(b)Real, upright, same size at the focus
(c)Virtual, inverted, highly enlarged infinity
(d)Real, inverted, highly enlarged at infinity

Q-34 When a horse pulls a cart, the force that makes the horse run forward is the force exerted by
(a) the horse on the ground
(b) the ground on the horse
(c) the horse on the cart
(d) the ground on the cart

Q-35 If two conducting spheres are separately charged and then brought in contact
(a) the total energy of the two spheres is conserved
(b) the total energy on the two spheres is conserved
(c) both the total charge and the total charge are conserved
(d) the final potential is always the mean of the original potential of the two spheres

Q-36 If we move from equator to pole, the value of g
(a) increases
(b) decreases
(c) remains same
(d) first increases then decreases

Q-37 Which one of the following is the weakest force?
(a) Gravitational force
(b) Electromagnetic force
(c) Nuclear force
(d) Electrostatic force

Q-38 Cavitation is a special application property exhibited only by
(a) Audible sound
(b) Infrasonic
(c) Ultrasonic
(d) Electromagnetic waves

Q-39 Cryogenic engines find application in
(a) washing machine
(b) frost free refrigerator
(c) rocket technology
(d) sub-marine propulsion

Q-40 A liquid is kept in a regular cylindrical vessel up to a certain height. If this vessel is replaced by another cylindrical vessel having half the area of cross-section of the bottom, the pressure on the bottom will
(a) remain unaffected
(b) be reduced to half the earlier pressure
(c) be increase to twice the earlier pressure
(d) be reduced to one-fourth the earlier pressure

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Q-41 Which one of the following reactions is the main cause of the energy radiation from the sun?
(a) Fusion reaction
(b) Fission reaction
(c) Chemical reaction
(d) Diffusion reaction

Q-42 When light enters from air to water, then its
(a) Frequency increases and speed decreases
(b) Frequency is same but the wavelength is smaller in water than in air
(c) Frequency is same but the wavelength is greater in water than in air
(d) Frequency is decreases but the wavelength is smaller in water than in air

Q-43 Which one of the following statements is correct?
(a) Both electron and neutron reside inside the nucleus
(b) Both electron and proton reside inside the nucleus
(c) Both proton and neutron reside inside the nucleus
(d) Only electron resides inside the nucleus

Q-44 Optical fibre mainly used in communication is based on
(a) less absorption coefficient
(b) less scattering
(c) total internal reflection
(d) refraction

Q-45 Mirage is a phenomenon due to
(a) reflection of light
(b) refraction of light
(c) total internal reflection of light
(d) total diffraction of light

Q-46 The blackboard seems black because it
(a) Reflects every colour
(b) Does not reflect any colour
(c) Absorbs black colour
(d) Reflects black colour

Q-47 A circular disc is to be made by using iron and aluminium so that it acquired maximum moment of inertia about the geometrical axis. It is possible with
(a) iron at interior and aluminium surrounding to it
(b) aluminium at interior and iron surrounding to it
(c) using iron and aluminium layers in alternate order
(d) None of the above

Q-48 Which one of the following statements about uranium is correct?
(a) Uranium (U-235) is fissionable by thermal neutrons.-
(b) Fast neutrons trigger the fission process in U-235
(c) U-238 breaks up into fragments, when bombarded by slow neutrons.
(d) U-235 is an unstable isotope and undergoes spontaneous fission.

Q-49 Which one of the following remains constant while throwing the ball upward?
(a) Force
(b) Kinetic energy
(c) Acceleration
(d) Velocity

Q-50 For which one of the following is capillary not the reason only?
(a) Rising of water from the roots of plant to its foliage
(b) Blotting of ink
(c) Rising of underground water
(d) Spread of water drop on a cotton cloth

Q-51 Consider the following statements regarding the electric fused wire
I.It has high melting point. II.It has very low specific resistance.
III.It is connected in parallel with the electric circuit.
Which of the statements given above is/are not correct?
(a) I, II and III
(b) I and III
(c) II and III
(d) Only II

Q-52 Consider the following statements
I. Clear sky appears blue due to poor scattering of blue wavelength of visible light.
II. Red part of light shows more scattering than blue light in the atmosphere.
III. In the absence of atmosphere,
there would be no scattering of light and sky will be black. Which of the statements given above is/are correct?
(a) I, II and III
(b) I and III
(c) II and III
(d) Only III

Q-53 Which of the following waves can propagate in a vacuum and select the correct answer using the codes given below the list?
I. Radio waves
II. Lightwave
III. X-ray
IV. Ultrasonic sound Codes
(a) I, II, III and IV
(b) I, II and III
(b) I, II and III
(b) I, II and III

Q-54 Who had showed that the electric and magnetic waves are equal in vacuum?
(a) Isaac Newton
(b) James Clerk Maxwell
(c) Albert Einstein
(d) Werner Heisenberg

Q-54 A thin pin of iron can be made to float on water-drinking in a bowl. This phenomenon is due to the
(a) Surface tension of water
(b) Viscous nature of water
(c) Presence of ionic bonds in water molecules
(d) Presence of covalent bonds in water molecules

Q-55 Consider the following metals
I. Uranium
II. Plutonium
Which of the following metals given above is/are used in making nuclear weapons?
(a) Only I
(b) Only II
(c) Both I and II
(d) Neither I nor II

Q-56 Which one of the following can convert the alternating current into direct current?
(a) Transformer
(b) Motor
(c) Dynamo
(d) Rectifier

Q-57 Which one of the following phenomena shows particle nature of light?
(a) Polarisation
(b) Photo-electric effect 
(c) Interference
(d) Refraction

Q-58 What is the function of a microphone?
(a) Convert sound signals to electric signals 
(b) Convert electric signals to sound signals
(c) Convert sound signals to electromagnetic waves
(d) None of the above

Q-59 Which one of the following is deviated by an electric field?
(a) a- rays 
(b) y – rays
(c) Neutrons
(d) X-rays

Q-60 Which one among the following lasers is used in cancer treatment?
(a) He-Ne laser
(b) Ruby laser
(c) C02 laser 
(d) Semiconductor laser

Q-61 Consider the following statements.
I. Atom bomb is based upon the principle of uncontrolled nuclear fusion.
II. Hydrogen bomb is based upon the principle of uncontrolled nuclear fusion.
III. Nuclear reactor is based upon the principle of uncontrolled nuclear fusion.
Which of the statements given above is/are correct?
(a) I, II and III
(b) I and III
(c) II and III
(d) Only II

Q-62 Why is it difficult to transmit audio signals directly?
(a) A very high antenna is needed for their propagation 
(b) Audio signals have a very high frequency
(c) Audio signals can’t propagate alone
(d) Audio signals can’t propagate through air

Q-63 Which one of the following statements about uranium is correct?
(a) Uranium (U-235) is fissionable by thermal neutrons.
(b) Fast neutrons trigger the fission process in U-235.
(c) U-238 breaks up into fragments, when bombarded by slow neutrons.
(d) U-235 is an unstable isotope and undergoes spontaneous fission.

Q-64 Modern movie songs released are the best in quality of sound. The rich quality of sound is due to which one of the following?
(a) A note of high frequency
(b) A note of high amplitude
(c) Consists many harmonics 
(d) Consists the fundamental frequency

Q-65 Consider the following communication systems
I. Fax II. E-mail III. Teleconferencing IV. Mobile telephone
Which of the communication systems given above are “digital communication systems?
(a) I, II, III and IV 
(b) I, II and III
(c) II and III
(d) II and IV

Q-66 The impurity atom with which pure silicon should be doped to make a p-type semiconductor are those of 
(a) phosphorus
(b) boron
(c) antimony
(d) arsenic

Q-67 Consider the following statements with reference to X-rays
I. They produce heat when absorbed by matter.
II. They are generated when fast moving electron strike a metal target.
III. They can penetrate through a thin sheet of aluminium.
Which of the following statements given above are correct?
(a) I, II and III 
(b) I and II
(c) I and III
(d) II and III

Q-68 Which of the following statements is/are true?
1. The angle of the axis in relation to the planer in which the earth revolves around the sun is not constant.
2. The amount of energy given off by the sun changes with the transparency of the atmosphere.
Select the correct answer using the codes given below
(a) Only 1
(b) Only 2
(c) Both 1 and 2
(d) Neither 1 nor 2

Q-69 In terms of magnetic properties, oxygen belongs to
(a) magnetic materials
(b) ferromagnetic materials
(c) paramagnetic materials 
(d) diamagnetic materials

Q-70 An objects is placed at the focus of a concave mirror. The image will be
(a) real, inverted, same size at the focus
(b) real, upright, same size at the focus
(c) virtual, inverted, highly enlarged infinity 
(d) real, inverted, highly enlarged at infinity

Q-71 Which of the following statements given below is correct in the respect of a geostationary satellite?
(a) It moves in a plane containing the Greenwich meridian
(b) It moves in a plane perpendicular to the celestial equatorial plane
(c) Its height above the earth’s surface is about the same as the radius of the earth
(d) Its height above the earth’s surface is about the six times the radius of the earth

Q-72 What will happen if the star having mass greater than five times of the Sun is dead?
(a) White dwarf will form
(b) Neutron star will form
(c) Black hole will form 
(d) Nebula will form

Q-73 In general what is the range of frequency of the “Message Signal”?
(a) Radio frequency
(b) Audio frequency
(c) Both ‘a’ and ‘b’
(d) Neither ‘a’ nor ‘b’

Q-74 Gravitational force shares a common feature with electromagnetic force. In both cases, the force is
(a) between massive and neutral objects
(b) between charged objects
(c) a short range
(d) a long range

Q-75 When you pull out the plug connected to an electric appliance, you will often observe a spark. To which property of the appliance is this related?
(a) Resistance
(b) Inductance
(c) Capacitance
(d) Wattage

Q-76 The scent sprayer is based on
(a) Carle’s law
(b) Boyle’s law
(c) Archimede’s principle
(d) Bernoulli’s theorem

Q-77 In scuba diving, while ascending towards the water surface, there is a danger of bursting the lungs. It is because
(a) Graham’s law of diffusion
(b) Archimede’s principle
(c) Boyle’s law
(d) Henry’s law

Q-78 Which type/types of pen uses/use capillary action in addition to gravity for flow of ink?
(a) Fountain pen
(b) Ballpoint pen
(c) Gel pen
(d) Both ballpoint and gel pens

Q-79 A perfect black body has the unique characteristic feature as
(a) a good absorber only
(b) a good radiator only
(c) a good absorber and a good radiator
(d) Neither an absorber nor radiator

Q-80 Why are the inner lining of hot water made up of copper?
(a) Copper has less heat capacity
(b) Copper has high electrical conductivity
(c) Copper does not react with steam
(d) Copper is good conductor of both heat and electricity

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Q-81 Which one of the following causes green house effect?
(a) Cosmic rays
(b) Ultra-violet rays
(c) Infrared rays
(d) Radio waves

Q-82 Light Emitting Diode (LED) converts
(a) light energy into electrical energy
(b) electrical energy into light energy
(c) thermal energy into light energy
(d) mechanical energy into electrical energy

Q-83 A space ship is from earth to moon and back. The greatest energy required for the spaceship is to overcome the difficulty in
(a) Entering the earth’s gravitational field
(b) entering the moon’s lunar surface
(c) take off from the lunar surface
(d) take off the Earth’s field

Q-84 Half portion of a rectangular piece of ice is wrapped with a white piece of cloth while the other half with black one.
In this context, which one of the following statements is correct?
(a) Ice melts more easily under white cloth
(b) Ice melts more easily under black cloth
(c) No ice melts at all under the white cloth
(d) No ice melts at all under the black cloth

Q-85 Consider the following statements
I. Electrons are universal constituents of matter.
II. J.J. Thomson received the very first Nobel Prize in physics for discovering the electron.
III. The mass of an electron is about 1/2000 that of neutron.
IV. According to Bohr the linear momentum of the electron is quantised in the Hydrogen atom.
Which of the statements given above are correct?
(a) I, II, III and IV
(b) I, II and III
(c) II and III
(d) III and IV

Q-86 A table cloth can be pulled from a table without dislodging the dishes. It is because of
(a) Graham’s law of diffusion
(b) Archimede’s principle
(c) Newton’s first law
(d) Newton’s^ second law

Q-87 Which one of the following instruments is used by the submarine sailors to see the objects on the surface?
(a) Telescope
(b) Microscope
(c) Gyroscope
(d) Periscope

Q-88 Which one of the following phenomena is associated with the fire flies giving cold light in night?
(a) Fluorescence
(b) Phosphorescence
(c) Chemiluminescence
(d) Effervescence

Q-89 A cyclotron can accelerate
(a) Ions
(b) Atoms
(c) Neutrons
(d) Gamma rays

Q-90 The focal length of convex lens is
(a) the same for all the colours
(b) shorter for blue light than for red
(c) shorter for red light than for blue
(d) maximum for yellow light

Q-91 A person is standing on a rotating stool spreading his arms. What will happen if he suddenly contracts his arm?
(a) His angular momentum increases
(b) His moment of inertia increases
(c) His moment of inertia decreases
(d) His angular momentum decreases

Q-92 In terms of magnetic properties, oxygen belongs to
(a) magnetic materials
(b) ferromagnetic materials
(c) paramagnetic materials
(d) diamagnetic materials

Q-93 Which one of the following forces lead to separation of the cream from the churned milk?
(a) Gravitational force
(b) Cohesive force
(c) Centripetal force
(d) Centrifugal force

Q-94 In general what is the range of frequency of the “Message Signal?
(a) Radio frequency
(b) Audio frequency
(c) Both ‘a’ and ‘b’
(d) Neither ‘a’ nor ‘b’

Q-95 If the radius of the Earth is made 1/4th, the duration of an year will become
(a) 8 times
(b) 4 times
(c) 1/8 times
(d) 1/4 times

Q-96 Which one of the following matter form the core of transformer?
(a) Steel
(b) Soft iron
(c) Tin
(d) Aluminium

Q-97 What enables us to write on the black board with chalk?
(a) Gravity
(b) Cohesion
(c) Adhesion
(d) Viscosity

Q-98 Who among the following received Nobel prize twice for the same subject
(a) Mari Curie
(b) Frederic Jolit
(c) Frederic Sanger
(d) Stanley Cohen

Q-99 Which of the following device is fully duplex
(a) Mobile phone
(b) Walky-talky
(c) Loud Speaker
(d) Radio

Q-100 Which of the following statements given below is correct in the respect of a geostationary satellite?
(a) It moves in a plane containing the Greenwich meridian
(b) It moves in a plane perpendicular to the celestial equatorial plane
(c) Its height above the earth’s surface is about the same as the radius of the earth
(d) Its height above the earth’s surface is about the six times the radius of the earth

Q-101 Nearly 30% of the solar radiations return back to the space without contributing anything to the earth’ s surface temperature. This amount of radiation is known as
(a) black body
(b) tropopause
(c) earth’s albedo
(d) mesopause

Q-102 Consider the following statements
I.Transverse waves occur when a disturbance creates oscillations perpendicular to the propagation.
II.Longitudinal waves occur when the oscillations are parallel to the direction of propagation.
Which of the following statements given above is/are correct?
(a) Only I
(b) Only II
(c) Both I and II
(d) Neither I nor II

Q-103 The impurity atom with which pure silicon should be doped to make a p-type semiconductor are those of
(a) Phosphorus
(b) Boron
(c) Antimony
(d) Arsenic

Q-104 Consider the following communication systems
I. Tele-printing
II. Telegraphy
III. Radio broadcast
IV. Fax
Which of the communication system given above are “analogue communication systems”?
(a)I, II, III and IV
(b) I, II and III
(c) II and III
(d) II and IV

Q-105 Why is it easier to swim in sea water?
(a) Atmospheric pressure is highest at the sea
(b) Sea water contains salt
(c) Density of sea water is higher than the ordinary water
(d) None of the above

Q-106 Which one of the following pairs of rays is electromagnetic in nature?
(a) Alpha rays and X-rays
(b) Alpha rays and cosmic rays
(c) Infrared rays and beta rays
(d) Infrared rays and X-rays

Q-107 Which of the following wavelengths will suffer maximum deviation while passing through a prism?
(a) Orange
(b) Red
(c) Green
(d) Violet

Q-108 In an satellite a space traveller tries to fill ink in a pen by dipping it in ink. The amount of the ink filled in the pen as compared to the quantity of ink filled on the earth’s surface will be
(a) same
(b) less
(c) more
(d) None of these

Q-109 The common soap used in washing is worked by
(a) Reducing the surface tension of water
(b) Increasing the surface tension of water
(c) Reducing the viscosity of water
(d) Increasing the viscosity of water

Q-110 A truck and a car are moving with equal velocity. On applying the brake both will stop after certain distance then which one of the following statements is correct?
(a) The truck will cover less distance before rest
(b) The car will cover less distance before rest
(c) Both will cover equal distance
(d) None of the above

Q-111 Hair of a shaving brush cling together when the brush is removed from water due to
(a) Viscosity
(b) Elasticity
(c) Friction
(d) Surface tension

Q-112 Which one of the following has given the centripetal force for a car moving on a road?
(a) Force of breaks
(b) The driver of the car
(c) Force by the steering wheel
(d) Friction due to tyres

Q-113 Which one of the following pairs of physical quantities may be represented in the same unit?
(a) Temperature and mole
(b) Heat and work
(c) Heat and temperature
(d) Specific heat ant heat

Q-114 When we speak into a microphone, what type of vibrations the diaphragm executes?
(a) Free
(b) Forced
(c) Resonant
(d) None of these

Q-115 Consider the following phenomena
1.Size of the sun at dusk
2.Colour of the sun at dawn
3.Moon being visible at dawn
4.Twinkle of stars in the sky
5.Polestar being visible in the sky
Which of the above are optical illusions?
(a) 1,2 and 3
(b) 3, 4 and 5
(c) 1,2 and 4
(d) 2, 3 and 5

Q-116 In the winter, we get warmer by using two blankets instead of one, why?
(a) Two blankets are thicker, so generate more heat
(b) Two blanket enclose air which does not allow the cold to penetrate
(c) Two blanket compress the air between the body and the blankets
(d) None of the above

Q-117 When a ball drops onto the floor it bounces. Why does it bounce?
(a) The floor is perfectly fluid
(b) The floor heats up on impact
(c) Newton’s third law implies that for every action (drop), there is a reaction (bounce)
(d) The floor exerts a force on the ball during the impact

Q-118 Two balloons are blown into spherical shape of unequal size and are connected through a narrow tube. Then what will observe?
(a) The smaller balloon becomes bigger
(b) The bigger balloon becomes smaller
(c) The smaller becomes smaller and the bigger becomes bigger
(d) There is no change in their size

Q-119 To start your loaded trolley bag, you exert more force than when it is moving. This is an example of 
(a) First law of thermodynamics
(b) Second law of thermodynamics
(c) Newton’s second law of motion
(d) Newton’s first law of motion

Q-120 Which one of the following common devices works on the basis of the principle of mutual induction?
(a) Tubelight
(b) Transformer
(c) LED
(d) Photodiode

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Q-121 A radar beam is sent onto a moving aeroplane in opposite direction of its approach. In which of these way it will be affected?
(a) Its wavelength decreases
(b) Its wavelength increases
(c) It remains unaffected
(d) None of the above

Q-122 If the spinning speed of the earth is increased then the weight of body at the equator
(a) increases
(b) decreases
(c) doubles
(d) does not change

Q-123 Which one of the following is used to determine the age of human fossils?
(a) Density determination of fossil
(b) Softness of the fossil
(c) Radio-carbon dating
(d) Water content of the fossil

Q-124 Now a day, most of buildings are made by having at least two layers of walls with a gap in between. Because 
(a) it makes the building stronger
(b) it prevents see page from outside
(c) it protects the building from lightning
(d) it helps in keeping the inside cooler in summer and warmer in winter

Q-125 Which of the following is true when the cells are connected in series?
(a) Current capacity increases
(b) Current capacity decreases
(c) The emf increases
(d) The emf decreases

Q-126 When the light is passed through a prism, the colour which deviates least is
(a) red
(b) green
(c) violet
(d) blue

Q-127 SONAR is mostly used by
(a) doctor
(b) engineers
(c) astronauts
(d) navigators

Q-128 In the electric supply lines in India, which parameter is kept constant?
(a) Current
(b) Voltage
(c) Power
(d) Frequency

Q-129 Stars are twinkling due to
(a) diffraction
(b) refraction 
(c) scattering
(d) reflection

Q-130 Which one of the following mechanisms uses the Pascal’s law?
(a) The flight take-off
(b) The floating of ship
(c) The hydraulic brakes 
(d) The landing of flight

Q-131 Two boats are moving in same direction in a river. What is the best condition so that the move parallel in the same direction?
(a) They should move parallel
(b) They should slightly bend to each other
(c) They should move away from each other 
(d) It is not possible

Q-132 Consider the following statements
I. The energy of stars are due to nuclear fission reaction.
II. The reflection of light causes the twinkling of stars. Which of the statements given above is/are correct?
(a) Only I
(b) Only II
(c) Both I and II
(d) Neither I nor II

Q-133 Two thin wooden sticks are floating on the surface of water close to each other. A hot needle touches the water between them. How will the sticks react to it?
(a) They will come closer
(b) They will move apart 
(c) They will move critically
(d) They will stay as before

Q-134 Why laser is used in the pipe alignment?
(a) They are directional in nature
(b) They are coherent
(c) They are monochromatic
(d) None of the above

Q-135 You placed a car in an open a parking area in a summer day. After a few hours, you noticed that the heat is trapped inside the car.
This phenomenon is known as
(a) Ozone depletion
(b) Greenhouse effect
(c) Solar effect
(d) Cosmic ray impingement

Q-136 Gravitational force shares a common feature with electromagnetic force. In both cases, the force is
(a) Between massive and neutral objects
(b) Between charged objects
(c) A short range
(d) A long range

Q-137 A mirror produces magnified erect image of an object. The nature of the mirror is
(a) Convex
(b) Concave
(c) Plane
(d) Neither convex nor concave

Q-138 To shield an instrument from an external magnetic field it may be placed in a cabinet made of
(a) wood
(b) ebonite
(c )metal
(d) diamagnetic substance

Q-139 Which one of the following reactions is the main cause of the energy radiation from the Sun?
(a) Fusion reaction
(b) Fission reaction
(c) Chemical reaction
(d) Diffusion reaction

Q-140 The image form by an object of a compound microscope is
(a) virtual and enlarged
(b) virtual and diminish
(c) real and diminish
(d) real and enlarged

Q-141 Which of the following has the most penetrating power?
(a) a- particles
(b) i- particles
(c) y- particles
(d) X-rays

Q-142 Which one is not produce by sound waves in air?
(a) Refraction
(b) Polarisation
(c) diffraction
(d) reflection

Q-143 The blue colour of sky is due to the phenomenon of
(a) Reflection
(b) Refraction
(c) Dispersion
(d) Scattering

Q-144 Which one of the following phenomena shows particle nature of light?
(a) Polarisation
(b) Photo-electric effect 
(c) Interference
(d) Refraction

Q-145 Which one of the following materials will have maximum sound velocity?
(a) He 
(b) H2
(c) N2
(d) 02

Q-146 The spread in colours in a rainbow on sky is primarily due to
(a) dispersion of sunlight
(b) reflection of sunlight 
(c) refraction of sunlight
(d) total internal reflection of sunlight

Q-147 A micro wave oven uses wave with a
(a) large wavelength in the invisible range
(b) small wavelength in the visible range
(c) large wavelength in the visible range
(d) small wavelength in the invisible range

Q-148 Which of the following has the least penetrating power?
(a) a- particles 
(b) p- particles
(c) y- particles
(d) None of these

Q-150 Consider the following statements with reference to X-rays
I. They produce heat when absorbed by matter.
II. They are generated when fast moving electron strike a metal target.
III. They can penetrate through a thin sheet of aluminium.
Which of the following statements given above are correct?
(a) I, II and III
(b) I and II
(c) I and III
(d) II and III

Q-151 Soap helps in the cleaning of cloths because
(a) It reduces surface tension
(b) It increases surface tension
(c) It absorbs the dirt
(d) Of some other reason

Q-152 What will happen if the star having mass greater than five times of the Sun is dead?
(a) White dwarf will form
(b) Neutron star will form
(c) Black hole will form
(d) Nebula will form

Q-153 Modern movie songs released are the best in quality of sound. The rich quality of sound is due to which one of the following?
(a) A note of high frequency
(b) A note of high amplitude
(c) Consists many harmonics
(d) Consists the fundamental frequency

Q-154 Which one of the following statements is correct?A slab of ice kept in a room
(a) does not radiate heat
(b) does not radiate heat but absorbs heat from the surrounding
(c) radiate heat but absorbs more heat from the surrounding
(d) radiate heat more than that absorbed by it from the surrounding

Q-155 When the matter is cooled to very low temperature, it will form
(a) semi-conductor
(b) super-conductor
(c) insulator
(d) capacitor

Q-156 Which of the following cannot be emitted by radioactive substances during their decay?
(a) Electrons
(b) Protons
(c) Neutrons
(d) Helium

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