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1556. An electric motor runs on which principle ?
A. Electrical energy can be converted into chemical energy in the presence of magnetic fields
B. a conductor carrying current in the direction perpendicular to the external magnetic field feels a force
C. The current flowing through a conductor causes generation of heat that drives the engine
D. Changing magnetic field induces an electromotive force in a conductor
Explanation:
1557. Which of the following is not a bleaching agent ?
A. Sulphur dioxide
B. Carbon dioxide
C. Sodium hypochlorite
D. Chlorine
Explanation:
1558. The principle of working of periscope is based on
A. reflection only
B. refraction only
C. reflection and refraction
D. reflection and interference
Explanation:
1559. In a cup, tea cools from 90 degree C to 80 degree C in exactly one minute. It will cool from 70 degree C to 60 degree C in :
A. less than one minute
B. exactly one minute
C. nearly one minute
D. more than one minute
Explanation:
1560. Who was conferred with the Bob Hope Humanitarian Award at the Emmy Awards of the Academy of Television Arts and Sciences recently?
A. Tom Cruise
B. Julia Roberts
C. George Clooney
D. Sean Penn
Explanation:
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