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476. Optical fibre works on the principle of
A. refraction
B. scattering
C. interference
D. total internal reflection
Explanation:
477. A violin has four strings but only two of them are used, the other two strings exist to produce
A. Beats
B. Resonance
C. Capillary action
D. None of the above
Explanation:
478. Which of the following acids is most important in building tissue proteins ?
A. Lactic
B. Amino
C. Linoleic
D. Saturated fatty
Explanation:
479. Given below are two statements, labelled as Assertion (A) and Reason (R). In the context of the two statements, which of the following is correct ?Assertion (A) : Organo chlorine pesticides like DDT, although highly effective in controlling the insect pests, have been banned in many western countries.Reason (R) : DDT has a tendency to remain stable in the environment for long periods.
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 the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.
Explanation:
480. Which of the following roofs provide better protection against heat ?
A. Cement slab
B. Asbestos sheets
C. Reinforced concrete
D. None of these
Explanation:
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