NEET Physics: Questions 820 - 823 of 2099
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Question number: 820
A man pushes a wall and fails to displace it. Choose incorrect statements related to his work
(1) Negative work
(2) Positive but not maximum work
(3) Maximum work
(4) No work at all
Select the correct answers and mark it according to the following codes:
2 and 4 are correct
1 and 2 are correct
1 and 3 are correct
1, 2 and 3 are correct
Question number: 821
Question number: 822
If g is the acceleration due to gravity on the earth’s surface, the gain in the potential energy of an object of mass m raised from surface of the earth to a height equal to radius R of the earth is - [M = mass of earth]
Question number: 823
As shown in the figure, a uniform sphere is rolling on a horizontal surface without slipping, under the action of a horizontal force F.
Power developed due to friction force is zero.
Power developed by gravity force is nonzero.
|a.||Ꭺ is true but Ꭱ is false|
|b.||Both Ꭺ and Ꭱ are false|
|c.||Ꭺ is false but Ꭱ is true|
|d.||Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ|