641. Clocks, which move with velocities comparable with the velocity of light, run ?
A: Slow
B: Fast
C: Equal to the velocity of light
D: With zero velocity
642. Parsec is a unit of __?
A: Time
B: Energy
C: Power
D: Distance
643. The instrument used to measure wind speed is?
A: Barometer
B: Anemometer
C: Hydrometer
D: Hygrometer
644. A canyon is a large form of _?
A: Gorge
B: Dry valley
C: Pediment
D: Badiand
645. A material with high elasticity :
A: Does not return to its original shape upon being stretched and then released
B: Returns as close as possible to its original shape upon being stretched and then released
C: Can be stretched to an infinite distance
D: None of these
646. Matter and energy :
A: Can be switched between the two
B: Converted in all closed system processes when taken together
C: Both A and B
D: None of these
647. Electric current :
A: Flows downward from a higher potential.
B: Is caused by the flow of electrons
C: Both A and B
D: None of these
648. Electricity and magnetism are :
A: Two facets of the same force
B: Always opposed to each other
C: Both A and B
D: None of these
649. Ball bearings help wheels and other rotating objects :
A: Move without consuming any energy
B: Rotate with less effort and friction.
C: Both A and B
D: None of these
650. Photography works by :
A: Keeping a record of the souls of the things being photographed
B: Capturing light reflected from the object being photographed
C: Both A and B
D: None of these
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