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261. Instruments can be shielded from outside magnetic effects by surrounding them with
A. iron shield
B. rubber shield
C. brass shield
D. glass shield
Explanation:
262. Why is the light of ordinary lamp hotter than the tubelight ?
A. It is due to incandescence.
B. It gives white light.
C. It has more surface for distribution of energy.
D. It is due to ionisation of gases.
Explanation:
263. Rainbow is produced by tiny rain drops suspended in front of sun rays as a result of
A. reflection and interference
B. refraction and dispersion
C. interference
D. reflection, refraction and dispersion
Explanation:
264. Man is able to see both distant & near objects because
A. lenses are movable.
B. the size of the pupil can be adjusted.
C. the lens can change its focal length.
D. there are different parts in the lens to see distant and nearby objects.
Explanation:
265. Two objects losing the same weight when immersed in water must have the same
A. weight in water
B. volume
C. weight in air
D. density
Explanation:
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