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1561. Though the temperature inside lighted electric bulb is around 2700 degree C, the filament does not burn because :
A. the metal of which it is made is resistant to burning
B. the oxygen necessary for combustion is not available as tha bulb is evacuated and filled with pure introgen or inert gases
C. it does not burn in closed systems
D. it is made of non-metallic susbstance
Explanation:
1562. Soldiers crossing a suspension bridge, always break steps, in case the frequency of vibration of their marching should coincide with that of the bridge and this is because of the phenomenin of :
A. refraction of sound
B. reverberation of sound
C. resonance of sound
D. echolocation of sound
Explanation:
1563. If a pendulum clock be taken from the earth to a revolving artificial satellite, it will :
A. run slow
B. run fast
C. give the same time
D. stop altogether
Explanation:
1564. If the distance between the earth and the sun were twice what it is now, the gravitational force exerted on the earth by the sun would be :
A. twice as large as it is now
B. four times as large as it is now
C. half of what it is now
D. one-fourth of what it is now
Explanation:
1565. The atmosphere exerts enormous pressure on us. But we do not feel it because :
A. we are used to it
B. our bones are very strong and can withstand this pressure
C. the surface area of our head is very small
D. our blood exerts a pressure slightly more than that of the atmosphere.
Explanation:
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