NEET Physics: Questions 197 - 200 of 2099
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Question number: 197
Question number: 198
Choose the correct statements
(1) Centripetal force is not a real force. It is only the requirement for circular motion.
(2) Work done by centripetal force may or may not be zero.
(3) Work done by centripetal force is always zero.
(4) Centripetal force is a fundamental force.
1, 2 and 3
1 and 3
2 and 4
1 and 2
Question number: 199
A cyclist is cycling on rough horizontal circular track with increasing speed. Then the frictional force on cycle is always directed towards center of the circular track.
For a particle moving in a circle, radial component of net force should be directed towards center. You have to select the correct choice.
|a.||Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ|
|b.||Ꭺ is true but Ꭱ is false|
|c.||Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ|
|d.||Both Ꭺ and Ꭱ are false|
Question number: 200
The angular speed with which the earth would have to rotate on its axis so that a person on the equator would weigh (3/5) th as much as present, will be: (Take the equatorial radius as 6400 km)
7.8 x 10 3 rad/sec
7.8 x 10 4 rad/sec
8.7 x 10 3 rad/sec
8.7 x 10 4 rad/sec