- 1(current)
Q. No.A body of mass 2 kg initially at rest moves under the action of an applied horizontal force of 7 N on a table with a coefficient of kinetic friction = 0.1. The work done by the applied force in 10 s is:
1. 882 J
2. 635 J
3. 247 J
4. 120 J
Subtopic: Â Concept of Work |
Level 3: 35%-60%
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Which one of the following statement is wrong?
| 1. | When a conservative force does positive work on a body, the potential energy of the body decreases. |
| 2. | Work done by a body against friction always results in a loss of its kinetic energy. |
| 3. | The rate of change of the total momentum of a many-particle system is proportional to the sum of the internal forces on the system. |
| 4. | In an inelastic collision of two bodies, the total linear momentum of the system of two bodies does not change after the collision. |
Subtopic: Â Concept of Work |Â Work Energy Theorem |
 57%
Level 3: 35%-60%
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An electron and a proton are detected in a cosmic ray experiment, the first with kinetic energy \(10~\text{keV},\) and the second with \(100~\text{keV}.\) The ratio of their speeds is:
(take \(m_e=9.31\times 10^{-31}~\text{kg},\) \(m_p=1.67\times 10^{-27}~\text{kg},\) \(1~\text{eV}=1.60\times 10^{-19}~\text{kg}\) )
1. \(13.5: 1\)
2. \(1: 1\)
3. \(1: 13.5\)
4. \(2: 1\)
Subtopic: Â Concept of Work |
 67%
Level 2: 60%+
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- 1(current)
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