Work done by frictional force during walking of a man is:
1. Positive
2. Negative
3. Zero
4. Maybe positive or negative
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA particle is moving such that the potential energy U varies with position in metres as U = ( - 2x + 50) J. The particle will be in equilibrium at:
1. x = 25 cm
2. x = 2.5 cm
3. x = 25 m
4. x = 2.5 m
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologySelect the incorrect statement about potential energy:
1. A change in potential energy is equal to work done against the internal conservative force.
2. A change in potential energy is independent of the reference point.
3. A change in potential energy depends on the reference frame.
4. The potential energy at a point is not unique.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA block of mass m is moving with speed v towards a spring block system. If the collision is perfectly inelastic, then the maximum compression in the spring will be:
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe figure shows the potential energy function U of a system in which a particle is in one-dimensional motion. In which region is the magnitude of the force on the particle greatest? (x: position)
1. OA
2. CD
3. AB
4. BC
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich of the following is not a unit of energy?
1. watt-hour
2. joule
3. eV
4. N/m
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyFour situations are shown in the following options. In each situation, planes are equally rough and the block begins with the same speed and slides until the kinetic frictional force has stopped it. In which of the following cases increase in thermal energy due to sliding is least?
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA block of mass m is placed in an elevator moving down with an acceleration . The work done by the normal reaction on the block as the elevator moves down through a height h is:
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe potential energy of a particle varies with distance r as shown in the graph. The force acting on the particle is equal to zero at:
1. P
2. S
3. Both Q and R
4. Both P and S
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA smooth sphere of mass M, moving with velocity u, directly collides elastically with another sphere of mass m at rest. After the collision, their final velocities are V and v, respectively. The value of v is:
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology