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1566. 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 passenger on the ship. What colour would it appear to an observer on the earth ?
A. Blue
B. Orange
C. Yellow
D. Yellow-Orange
Explanation:
1567. Endoscope, used by doctors for examining the inside of a patients stomach, works on the principle of :
A. reflection of light
B. dispersion of light
C. refraction of light
D. total internal reflection of light
Explanation:
1568. The minimum length of a plane mirror in which a person can see himself full length should be :
A. equal to the persons height
B. slightly more than his height
C. nearly half his height
D. nearly one-fourth his height
Explanation:
1569. The heat required to vaporise the refrigerant in the cooling unit of an electric refrigerator is furnished by
A. the electric motor
B. the friction in the pipes
C. the food in the refrigerator
D. the air outside the refrigerator
Explanation:
1570. In storms, the roofs of some houses are carried away.This is in accordance with :
A. Bernoullis principle
B. Archimedes principle
C. Law of inertia
D. Pascals law
Explanation:
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