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1466. When iron rusts, its wight :
A. decreases
B. increases
C. shows no change
D. decreases and then increases
Explanation:
1467. In an electronic watch, the component corresponding to the pendulum of a pendulum clock is :
A. Transistor
B. Balance wheel
C. Crystal oscillator
D. Diode
Explanation:
1468. With which of the following intruments can a sailor in a submarine see the objects on the surface of sea ?
A. Periscope
B. Telescope
C. Gyroscope
D. Stereoscope
Explanation:
1469. The jet plane engine works on the principle of
A. mass
B. linear momentum
C. energy
D. angular momentum
Explanation:
1470. The blue colour of the water in the sea is due to :
A. absorption of other colours by water molecules
B. reflection of the blue light by the impurities in sea water
C. reflection of blue sky by sea water and scattering of blue light by water molecules
D. none of these
Explanation:
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