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276. Friction can be reduced by changing over from
A. dynamic to static
B. rolling to sliding
C. sliding to rolling
D. None of these
Explanation:
277. When a person is standing on a weighing scale in a lift and the lift is moving upwards, then the weighing scale will show
A. actual weight of the person
B. less weight
C. higher weight
D. zero reading
Explanation:
278. Safety fuses are integral part of electric installatios and instruments. This is so because safety fuses
A. provide alternative path to excess current as does a shunt
B. switch off the service of electric supply through relay action
C. burn if current beyond a certain limit flows through the circuit
D. block the passage of current due increase in their resistance
Explanation:
279. Why is a cart pushed continuously on the road to keep it in motion with a constant velocity ?
A. To accelerate the motion of the cart continuously
B. To bring a change in the inertia of the cart
C. To balance the force of friction acting on the cart
D. To increase the force of friction acting on the cart
Explanation:
280. Which of the following is used as a moderator in nuclear reactor ?
A. Ordinary water
B. Radium
C. Thorium
D. Graphite
Explanation:
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