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1551. We cannot see during a fog because of :
A. reflection of light
B. internal reflection
C. refraction
D. scattering of light
Explanation:
1552. It is not sufficient to bring a piece of ice to its melting point to melt it. An additional amount of heat energy is required to turn such solid into water at the same temperature and such extra amount of heat required is called :
A. heat of fusion
B. heat of fission
C. latent heat of liquidation
D. heat of transformation
Explanation:
1553. Suppose a piece of ice is dropped in a glass of water so that the level of water is on the brim. After melting of ice :
A. the water level of the glass will fall
B. the water level will rise and some water will over flow the glass
C. the water level will remain the same
D. the fall or rise of water level will depend on the size of the ice-piec.
Explanation:
1554. Copper wires are generally used for electrical power transmission instead of iron wires because :
A. copper is a better conductor than iron
B. copper is cheaper than iron
C. copper can take higher power than iron
D. copper is lighter than iron
Explanation:
1555. Which law is involved in the act of cleaning a carpet by beating it with a stick ?
A. First law of motion
B. Second law of motion
C. Law of conservation of energy
D. Law of conservation of mass
Explanation:
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