Science & Technology PYQs

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1. 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
2. Prelims 2001Q104Physics

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

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

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

   aincreasesbdecreasescdoes not changedfirst decreases and then increases
4. Prelims 2001Q106Defence & Nuclear Technology

   Consider the following statements: In a nuclear reactor, self-sustained chain reaction is possible, because

   I.More neutrons are released in each of the fission reactions.

   II.The neutrons immediately take part in the fission process.

   III.The fast neutrons are slowed down by Graphite.

   IV.Every neutron released in the fission reaction initiates further fission.

   Which of these statements are correct?

   aI, II and IIIbI and IIIcII and IVdII, III and IV
5. 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
6. Prelims 2001Q108Space Technology

   Who is the scientist in whose honour the “Chandra” X-ray telescope has been named?

   aChandrasekhar Venkat RamanbJagdish Chandra BosecPrafulla Chandra RoydSubrahmanyan Chandrasekhar
7. 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
8. 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
9. 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
10. Prelims 2001Q116Chemistry

    Assertion (A): A chemical reaction becomes faster at higher temperatures.

    Reason (R): At higher temperatures, molecular motion becomes more rapid.

    Which of the following is correct?

    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
11. Prelims 2001Q117Chemistry

    Which one of the following is NOT radioactive?

    aAstatinebFranciumcTritiumdZirconium
12. Prelims 2001Q118Chemistry

    Which one of the following is the correct sequence in increasing order of molecular weights of the hydrocarbons?

    aMethane, ethane, propane and butanebPropane, butane, ethane and methanecButane, ethane, propane and methanedButane, propane, ethane and methane
13. Prelims 2001Q119Chemistry

    In an atom, the order of filling up of the orbitals is governed by

    aAufbau principlebHeisenberg’s uncertainty principlecHund’s ruledPauli’s exclusion principle
14. Prelims 2001Q120Chemistry

    An aqueous solution of copper sulphate is acidic in nature because the salt undergoes

    adialysisbelectrolysischydrolysisdphotolysis
15. Prelims 2001Q121Chemistry

    Consider the following statements with reference to the Periodic Table of chemical elements:

    I.Ionisation potential gradually decreases along a period.

    II.In a group of elements, electron affinity decreases as the atomic weight increases.

    III.In a given period, electronegativity decreases as the atomic number increases.

    Which of these statement(s) is/are correct?

    aI onlybII onlycI and IIIdII and III
16. Prelims 2001Q123Biology & Human Body

    Which of the following cell organelles play the most significant role in protein synthesis?

    aLysosome and CentrosomebEndoplasmic reticulum and RibosomecGolgi apparatus and MitochondriadLysosome and Mitochondria
17. Prelims 2001Q124Biotechnology

    Assertion (A): Scientists can cut apart and paste together DNA molecules at will, regardless of the source of the molecules.

    Reason (R): DNA fragments can be manipulated using restriction endonucleases and DNA ligases.

    Which of the following is correct?

    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
18. Prelims 2001Q125Biology & Human Body

    The cellular and molecular control of programmed cell death is known as

    aApoptosisbAgeingcDegenerationdNecrosis
19. Prelims 2001Q126Biology & Human Body

    Which organelle in the cell, other than nucleus, contains DNA?

    aCentriolebGolgi apparatuscLysosomedMitochondrion
20. Prelims 2001Q128Biology & Human Body

    Antigen is a substance which

    adestroys harmful bacteriabis used to treat poisoningclowers body temperaturedstimulates formation of antibody