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Exam Year: 1999

  • Assertion (A) : Insect resistant transgenic cotton has been produced by inserting Bt gene. Reason (R) : The Bt gene is derived from a bacterium.

    (a)

    Both A and R are true, and R is the correct explanation of A

    (b)

    Both A and R are true, but R is not a correct explanation of A

    (c)

    A is true, but R is false

    (d)

    A is false, but R is true

    Correct Answer:

  • Consider the following statements : Glass can be etched or scratched by I. diamond. II. hydrofluoric acid. III. aquaregia. IV. cone, sulphuric acid. Which of these statements are correct ?

    (a)

    I and IV

    (b)

    II and III

    (c)

    I and II

    (d)

    II and IV

    Correct Answer:

  • Assertion (A) : To dilute sulphuric acid, acid is added to water and not water to acid. Reason (R) : Specific heat of water is quite large.

    (a)

    Both A and R are true, and R is the correct explanation of A

    (b)

    Both A and R are true, but R is not a correct explanation of A

    (c)

    A is true, but R is false

    (d)

    A is false, but R is true

    Correct Answer:

  • Low temperatures (Cryogenics) find application in

    (a)

    space travel, surgery and magnetic levitation

    (b)

    surgery, magnetic levitation and telemetry

    (c)

    space travel, surgery and telemetry

    (d)

    space travel, magnetic levitation and telemetry

    Correct Answer:

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

    (a)

    alpha rays.

    (b)

    beta rays.

    (c)

    gamma rays.

    (d)

    X-rays.

    Correct Answer:

  • Which one of the following types of coal contains a higher percentage of carbon than the rest ?

    (a)

    Bituminous coal

    (b)

    Lignite

    (c)

    Peat

    (d)

    Anthracite

    Correct Answer:

  • Which one of the following is a useful functional association between fungi and the roots of higher plants ?

    (a)

    Biofertilizer

    (b)

    Coralloid root

    (c)

    Lichen

    (d)

    Mycorrhiza

    Correct Answer:

    (d)

  • When ants bite, they inject

    (a)

    glacial acetic acid

    (b)

    methanol

    (c)

    formic acid

    (d)

    stearic acid

    Correct Answer:

    (c)

  • Which one of the following agricultural practices is eco-friendly ?

    (a)

    Organic farming

    (b)

    Shifting cultivation

    (c)

    Cultivation of high-yielding varieties

    (d)

    Growing plants in glass-houses

    Correct Answer:

    (a)

  • Strips of two metals A and B are firmly joined together as shown in the figure(Before Heating) On heating, A expands more than B does. If this joined strip is heated, then it will appear as

    (a)

    I

    (b)

    II

    (c)

    III

    (d)

    IV

    Correct Answer: