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1426. Transfer of heat emergy from the sun to the moon takes place by :
A. radiation only
B. radiation and condsuction
C. radiation and convection
D. radiation, conduction and convection
Explanation:
1427. Microphone is a device in which :
A. sound waves are directly transmitted
B. electrical energy is cnverted into sound waves directly
C. sound waves are converted into electrical energy and then reconverted into sound after transmission
D. amplification is not required at all
Explanation:
1428. A solid sphere, a disc and a ring of the same mass and radius are allowed to roll down a frictinless inclined plane simultaneously from the same height. In this context, which one of the following statements is correct ?
A. The disc reached down first
B. The sphere reaches down first
C. The ring reaches down first
D. All of them reach down simultaneously
Explanation:
1429. Two bodies A and B are of some mass, and same amount of heat is given to both of them. If the temperature of A increases more than that fo B because of heat addition, then :
A. the specific heat capacity of A is more than that of B
B. the specific heat capacity of A is less than that of B
C. both A and B have the same specific heat capacity but A has greater thermal conductivity
D. both A and B have the same specific heat capacity but B has greater thermal conductivity
Explanation:
1430. One Astronomical Unit is the average distance between
A. Earth and the Sun
B. Earth and the Moon
C. Jupiter and the Sun
D. Pluto and the Sun
Explanation:
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