Science & Technology PYQs

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1. Prelims 2001Q129Biology & Human Body

   Which of the following features of DNA makes it uniquely suited to store and transmit genetic information from generation to generation?

   aComplementarity of the two strandsbDouble helixcNumber of base pairs per turndSugar phosphate backbone
2. Prelims 2001Q130Biotechnology

   The American multinational company, Monsanto has produced an insect-resistant cotton variety that is undergoing field-trials in India. A toxin gene from which ONE of the following bacteria has been transferred to this transgenic cotton?

   aBacillus subtilisbBacillus thuringiensiscBacillus amyloliquifanciensdBacillus globli
3. Prelims 2001Q131Biology & Human Body

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

   List I (Bone)

   A.Breast-bone

   B.Collar-bone

   C.Knee-cap

   D.Shoulder blade

   List II (Name)

   1.Clavicle

   2.Patella

   3.Scapula

   4.Sternum

   aA-4, B-1, C-3, D-2bA-1, B-4, C-3, D-2cA-1, B-4, C-2, D-3dA-4, B-1, C-2, D-3
4. Prelims 2001Q132Biology & Human Body

   Consider the following statements:

   I.Tapeworm is a hermaphrodite.

   II.Round-worm has separate sexes.

   III.Filaria is caused by a nematode.

   IV.Guinea worm is an annelid.

   Which of these are correct?

   aI and IIbI, II and IIIcIII and IVdII, III and IV
5. Prelims 2001Q133Inventions & Scientists

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

   List I (Achievement in genetics)

   A.Discovery of transduction and conjugation in bacteria

   B.Establishing the sex-linked inheritance

   C.Isolation of DNA polymerase from E. coli

   D.Establishing the complete genetic code

   List II (Scientists)

   1.Khurana

   2.Kornberg

   3.Lederberg

   4.Morgan

   5.Ochoa

   aA-4, B-3, C-2, D-1bA-3, B-4, C-1, D-5cA-4, B-3, C-1, D-5dA-3, B-4, C-2, D-1
6. Prelims 2001Q134Health & Diseases

   “Athlete’s Foot” is a disease caused by

   aBacteriabFunguscProtozoandNematode
7. Prelims 2001Q135Biology & Human Body

   In the eye donation, which part of the eye is transplanted from the donor?

   aCorneabLenscRetinadThe whole eye
8. Prelims 2001Q136Biology & Human Body

   A man whose blood group is not known meets with a serious accident and needs blood transfusion immediately. Which one of the blood groups mentioned below and readily available in the hospital will be safe for transfusion?

   aO, Rh-bO, Rh+cAB, Rh-dAB, Rh+
9. Prelims 2001Q137Health & Diseases

   “Metastasis” is the process by which

   acells divide rapidly under the influence of drugsbcancer cells spread through the blood or lymphatic system to other sites or organscthe chromosomes in cell nuclei are attached to the spindle before moving to the anaphase polesdcancer cells are successfully inhibited to divide any further
10. Prelims 2001Q138Biology & Human Body

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

    List I (Substance)

    A.Ptyalin

    B.Pepsin

    C.Renin

    D.Oxytocin

    List II (Physiological role)

    1.Converts angiotensinogen in blood into angiotensin

    2.Digests starch

    3.Digests proteins

    4.Hydrolyses fats

    5.Induces contraction of smooth muscles

    aA-2, B-3, C-1, D-5bA-3, B-4, C-2, D-5cA-2, B-3, C-5, D-1dA-3, B-1, C-2, D-4
11. Prelims 2000Q95Physics

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

    aLight wavesbSound wavescMicro wavesdRadio waves
12. Prelims 2000Q96Physics

    A noise level of 100 decibels would correspond to

    ajust audible soundbordinary conversationcsound from a noisy streetdnoise from a machine shop
13. Prelims 2000Q97Space Technology

    A ‘black hole’ is a body in space which does not allow any radiation to come out. This property is due to its

    avery small sizebvery large sizecvery high densitydvery low density
14. Prelims 2000Q98IT & Communication

    The memory of a computer is commonly expressed in terms of Kilobytes or Megabytes. A byte is made up of

    aeight binary digitsbeight decimal digitsctwo binary digitsdtwo decimal digits
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