Science & Technology PYQs

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1. Prelims 1995Q110Physics

   Optical fibre works on the principle of

   atotal internal reflectionbrefractioncscatteringdinterference
2. Prelims 1995Q111PhysicsAnswer disputed

   Suppose a rocketship is receding from the earth at a speed of 2⁄10th the velocity of light. A light in the rocketship appears blue to the passengers on the ship. What colour would it appear to an observer on the earth?

   aBluebOrangecYellowdYellow-orange
3. Prelims 1995Q112Chemistry

   Which one of the following pairs of materials serves as electrodes in chargeable batteries commonly used in devices such as torchlights, electric shavers, etc.?

   aNickel and cadmiumbZinc and carboncLead peroxide and leaddIron and cadmium
4. Prelims 1995Q113Space Technology

   Cryogenic engines find applications in

   asub-marine propulsionbfrost-free refrigeratorscrocket technologydresearches in superconductivity
5. Prelims 1995Q115Physics

   An air bubble in water will act like a

   aconvex mirrorbconvex lenscconcave mirrordconcave lens
6. Prelims 1995Q116Defence & Nuclear Technology

   The difference between a nuclear reactor and an atomic bomb is that

   ano chain reaction takes place in nuclear reactor while in the atomic bomb there is a chain reactionbthe chain reaction in nuclear reactor is controlledcthe chain reaction in nuclear reactor is not controlleddno chain reaction takes place in atomic bomb while it takes place in nuclear reactor
7. Prelims 1995Q119Health & DiseasesAnswer disputed

   Which one of the following sets is correctly matched?

   aDiphtheria, Pneumonia and Leprosy: HereditarybAIDS, Syphilis and Gonorrhoea: BacterialcColour blindness, Haemophilia and Sickle cell anaemia: Sex linkeddPolio, Japanese B encephalitis and plague: Viral
8. Prelims 1995Q120Biology & Human Body

   A person with ‘AB’ blood group is sometimes called a universal recipient because of the

   alack of antigen in his bloodblack of antibodies in his bloodclack of both antigens and antibodies in his blooddpresence of antibodies in his blood
9. Prelims 1995Q121Biology & Human Body

   Which one of the following is a membrane that protects the developing embryo from desiccation?

   aAmnionbAllantoiscChoriondYolk sac
10. Prelims 1995Q122Health & Diseases

    Which one of the following antimicrobial drugs is suitable for treatment of both tuberculosis and leprosy?

    aIsoniazidbp-aminosalicylic acidcStreptomycindRifampicin
11. Prelims 1995Q123Biology & Human Body

    Most of the desert plants bloom during night time because

    atheir blooming is controlled by low temperaturebthey are sensitive to the phases of mooncthe desert insects eat away flowers during day timedthe desert insects are active during night time
12. Prelims 1995Q125Biology & Human Body

    Which of the following elements are present in all proteins?

    I.Carbon

    II.Hydrogen

    III.Oxygen

    IV.Nitrogen

    Select the correct answer from the codes given below:

    aI and IIbI, II and IVcI, III and IVdI, II, III and IV
13. Prelims 1995Q126Biology & Human Body

    Which one of the following hormones contains iodine?

    aThyroxinebTestosteronecInsulindAdrenaline
14. Prelims 1995Q127Inventions & Scientists

    “By weaving threads of physics, chemistry and biology into a rich tapestry, this remarkable scientist provided a unifying molecular view of the world... He touted the wonderful properties of Vitamin C first as a cure of common cold and later as a preventive agent against cancer.” One of science’s major figures of all time referred to above is

    aG.N. LewisbLinus Carl PaulingcFritz LondondWalter Heitler
15. Prelims 1995Q129Health & Diseases

    “It begins as a single cell and grows into a merciless disease that claims millions of lives year after year. But scientists are steadily unlocking its mysteries, and the fight against it may now have reached a dramatic turning point. New discoveries promise better therapies and hope in the war against ...” The disease referred to in the above quotation is

    aCancerbAIDScTuberculosisdAlzheimer’s disease
16. Prelims 1995Q130Defence & Nuclear Technology

    ‘Yellow cake’, an item of smuggling across borders is

    aa crude form of heroinba crude form of cocainecuranium oxidedunrefined gold