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186. The time period of a pendulum on moon
A. becomes zero
B. increases
C. remains the same
D. decreases
Explanation:
187. A greenish yellow colour is seen on a boiled egg. This is due to
A. oxidation of some vitamins in the egg
B. oxidation of sulphur in the egg
C. formation of some iron compounds
D. None of these
Explanation:
188. Why does the police use dogs for detective work ? Because .........
A. They have sharp eye-sight.
B. they can run very fast.
C. they can hear ultrasonic eaves.
D. they are easily trainable.
Explanation:
189. The tube light is felt cooler than the light from a bulb of the same wattage because the
A. tube is fixed at a greater height than the bulb.
B. surface area of a tube is larger than that of a bulb.
C. tungsten is not used in the tube.
D. tube consumes less power.
Explanation:
190. With rise in temperature, the speed of sound
A. increases
B. drops
C. remains the same
D. changes
Explanation:
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