Physics PYQs

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1. Prelims 2002Q143Physics

   Assertion (A): With the increase of temperature, the viscosity of glycerine increases.

   Reason (R): Rise of temperature increases kinetic energy of molecules.

   aBoth A and R are individually true and R is the correct explanation of AbBoth A and R are individually true but R is not a correct explanation of AcA is true but R is falsedA is false but R is true
2. Prelims 2002Q150Physics

   Assertion (A): An iron ball floats on mercury but gets immersed in water.

   Reason (R): The specific gravity of iron is more than that of mercury.

   aBoth A and R are individually true and R is the correct explanation of AbBoth A and R are individually true but R is not a correct explanation of AcA is true but R is falsedA is false but R is true
3. Prelims 2001Q100Physics

   Two wires have their lengths, diameters and resistivities, all in the ratio of 1 : 2. If the resistance of the thinner wire is 10 ohms, the resistance of the thicker wire is

   a10 ohmsb5 ohmsc20 ohmsd40 ohms
4. Prelims 2001Q101Physics

   Assertion (A): A stick is dipped in water in a slanting position. If observed sideways, the stick appears short and bent at the surface of water.

   Reason (R): The light coming from the stick undergoes scattering from water molecules giving the stick a short and bent appearance.

   aBoth A and R are individually true and R is the correct explanation of AbBoth A and R are individually true but R is NOT a correct explanation of AcA is true but R is falsedA is false but R is true
5. Prelims 2001Q102Physics

   Assertion (A): A piece of copper and a piece of glass are heated to the same temperature.

   When touched, thereafter, the copper piece appears hotter than the glass piece.

   Reason (R): The density of copper is more than that of glass.

   aBoth A and R are individually true and R is the correct explanation of AbBoth A and R are individually true but R is NOT a correct explanation of AcA is true but R is falsedA is false but R is true
6. Prelims 2001Q103Physics

   Assertion (A): The boiling point of water decreases as the altitude increases.

   Reason (R): The atmospheric pressure increases with altitude.

   aBoth A and R are individually true and R is the correct explanation of AbBoth A and R are individually true but R is NOT a correct explanation of AcA is true but R is falsedA is false but R is true
7. Prelims 2001Q104Physics

   When light waves pass from air to glass, the variables affected are

   aWavelength, frequency and velocitybVelocity and frequencycWavelength and frequencydWavelength and velocity
8. Prelims 2001Q105Physics

   When water is heated from 0 °C to 10 °C, its volume

   aincreasesbdecreasescdoes not changedfirst decreases and then increases
9. Prelims 2001Q107Physics

   Match List I with List II and select the correct answer using the codes given below the Lists:

   List I (Characteristic)

   A.Zero mass

   B.Fractional charge

   C.Fractional spin

   D.Integral spin

   List II (Particle)

   1.Positron

   2.Neutrino

   3.Quark

   4.Phonon

   aA-2, B-3, C-1, D-4bA-3, B-2, C-4, D-1cA-2, B-3, C-4, D-1dA-3, B-2, C-1, D-4
10. Prelims 2001Q109Physics

    The mass of a body on Earth is 100 kg (acceleration due to gravity, gₑ = 10 m/s²). If acceleration due to gravity on the Moon = gₑ/6, then the mass of the body on the moon is

    a100/6 kgb60 kgc100 kgd600 kg
11. Prelims 2001Q110Physics

    Consider the following statements: A simple pendulum is set into oscillation. Then

    I.The acceleration is zero when the bob passes through the mean position.

    II.In each cycle the bob attains a given velocity twice.

    III.Both acceleration and velocity of the bob are zero when it reaches its extreme position during its oscillation.

    IV.The amplitude of oscillation of the simple pendulum decreases with time.

    Which of these statements are correct?

    aI and IIbIII and IVcI, II and IVdII, III and IV
12. Prelims 2001Q113Physics

    A radioactive substance has a half-life of four months. Three fourth of the substance would decay in

    a3 monthsb4 monthsc8 monthsd12 months
13. Prelims 2000Q95Physics

    Which one of the following does a TV remote control unit use to operate a TV set?

    aLight wavesbSound wavescMicro wavesdRadio waves
14. Prelims 2000Q96Physics

    A noise level of 100 decibels would correspond to

    ajust audible soundbordinary conversationcsound from a noisy streetdnoise from a machine shop
15. Prelims 2000Q99PhysicsAnswer disputed

    Consider the following features of newer models of motor cars:

    I.Radial tyres

    II.Streamlined body

    III.Multipoint fuel injection

    IV.Catalytic converter with exhaust

    Which of these features make the newer models of motor cars more fuel-efficient?

    aI and IIbII and IIIcIII and IVdI, III and IV
16. Prelims 2000Q100Physics

    Fluorescent tubes are fitted with a choke. The choke coils

    astep up the line voltagebstep down the line voltagecreduce current in the circuitdchoke low-frequency currents
17. Prelims 2000Q101Physics

    For reproducing sound, a CD (Compact Disc) audio player uses a

    aquartz crystalbtitanium needleclaser beamdbarium titanate ceramic
18. Prelims 2000Q102Physics

    When a CD (Compact Disc used in audio and video systems) is seen in sunlight, rainbow-like colours are seen. This can be explained on the basis of the phenomenon of

    areflection and diffractionbreflection and transmissioncdiffraction and transmissiondrefraction, diffraction and transmission
19. Prelims 2000Q103Physics

    Assertion (A): A man standing on a completely frictionless surface can propel himself by whistling.

    Reason (R): If no external force acts on a system, its momentum cannot change.

    aBoth A and R are true, and R is the correct explanation of AbBoth A and R are true, but R is not a correct explanation of AcA is true, but R is falsedA is false, but R is true
20. Prelims 2000Q104Physics

    Assertion (A): In a motion picture, usually 24 frames are projected every second over the whole length of the film.

    Reason (R): An image formed on the retina of eye persists for about 0.1 s after the removal of stimulus.

    aBoth A and R are true, and R is the correct explanation of AbBoth A and R are true, but R is not a correct explanation of AcA is true, but R is falsedA is false, but R is true
21. Prelims 2000Q105Physics

    Assertion (A): Small glass beads fixed on traffic signals glow brightly when light falls upon them.

    Reason (R): Light is totally reflected when the angle of incidence exceeds a certain critical value and light travelling in a denser medium is reflected from a rarer medium.

    aBoth A and R are true, and R is the correct explanation of AbBoth A and R are true, but R is not a correct explanation of AcA is true, but R is falsedA is false, but R is true
22. Prelims 1999Q105Physics

    Consider the following statement: An ordinary light bulb has a rather short life because the

    I.Filament wire is not uniform.

    II.Bulb cannot be evacuated completely.

    III.Wires supporting the filament melt at high temperatures.

    Which of the above statements are correct?

    aI and IIIbII and IIIcI and IIdI, II and III
23. Prelims 1999Q112Physics

    Consider the following statements regarding a motor car battery:

    I.The voltage is usually 12 V.

    II.Electrolyte used is hydrochloric acid.

    III.Electrodes are lead and copper.

    IV.Capacity is expressed in ampere-hour.

    Which of the above statements are correct?

    aI and IIbII and IIIcIII and IVdI and IV
24. Prelims 1999Q113Physics

    Match List I (Quantity) with List II (Units) and select the correct answer using the codes given below the Lists:

    List I

    I.High speed

    II.Wavelength

    III.Pressure

    IV.Energy

    List II

    A) Mach

    B) Angstrom

    C) Pascal

    D) Joule

    Codes:

    aI-B, II-A, III-C, IV-DbI-A, II-B, III-D, IV-CcI-A, II-B, III-C, IV-DdI-B, II-A, III-D, IV-C
25. Prelims 1999Q115Physics

    For which one of the following is capillarity not the only reason?

    aBlotting of inkbRising of underground watercSpread of water drop on a cotton clothdRising of water from the roots of a plant to its foliage
26. Prelims 1999Q116Physics

    Consider the following statements:

    I.If a person looks at a coin which is in a bucket of water, the coin will appear to be closer than it really is.

    II.If a person under water looks at a coin above the water surface, the coin will appear to be at a higher level than it really is.

    Which of the above statements is/are correct?

    aI and IIbI alonecII alonedNeither I nor II
27. Prelims 1999Q118Physics

    Barium in a suitable form is administered to patients before an X-ray examination of the stomach, because

    abarium allows X-rays to pass through the stomach on account of its transparency to X-raysbbarium compound, like magnesium sulphate helps in cleaning the stomach before X-ray examinationcbarium is a good absorber of X-rays and this helps the stomach to appear clearly in contrast with the other regions in the picturedbarium salts are white in colour and this helps the stomach to appear clearly in contrast with other regions in the picture
28. Prelims 1999Q119Physics

    Endoscopy, a technique used to explore the stomach or other inner parts of the body is based on the phenomenon of

    atotal internal reflectionbinterferencecdiffractiondpolarisation
29. Prelims 1999Q125Physics

    Cobalt-60 is commonly used in radiation therapy because it emits

    aalpha raysbbeta rayscgamma raysdX-rays
30. Prelims 1999Q126Physics

    Low temperatures (Cryogenics) find application in

    aspace travel, surgery and magnetic levitationbsurgery, magnetic levitation and telemetrycspace travel, surgery and telemetrydspace travel, magnetic levitation and telemetry