Select Chapter Topics:
Q. No.A block of \(1\) kg is released from a top of a smooth curve AB, and then it encounters a rough surface BC, coming to rest at C. The work done by friction is: (\(g=10\) m/s2)
1. \(25\) J
2. \(50\) J
3. \(-25\) J
4. \(-50\) J
1. \(25\) J
2. \(50\) J
3. \(-25\) J
4. \(-50\) J
Subtopic: Â Work Energy Theorem |
 68%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
The minimum speed that a simple pendulum's bob should be given so that it rises to a level where its string makes \(60^\circ\) with the vertical is:
1. \(\sqrt{2gL}\)
2. \(\sqrt{2gL}\) \(cos 60^\circ\)
3. \(\sqrt{2g(L-L~cos60^\circ)}\)
4. \(\sqrt{2gL}\) \(sin 60^\circ\)
Subtopic: Â Gravitational Potential Energy |
 83%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
A block is suspended from a spring and causes an extension of \(2\) cm. It is now imparted a kinetic energy \(E\) so that the block rises up by exactly \(2\) cm. If the block were to be given the same kinetic energy upward, without being attached to a spring, it would rise up by:
1. \(1\) cm
2. \(2\) cm
3. \(4\) cm
4. \(8\) cm
1. \(1\) cm
2. \(2\) cm
3. \(4\) cm
4. \(8\) cm
Subtopic: Â Elastic Potential Energy |
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
The work done by all the forces (external and internal) on a system equals the change in:
| 1. | total energy | 2. | kinetic energy |
| 3. | potential energy | 4. | none of these |
Subtopic: Â Work Energy Theorem |
 73%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
Links
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
A block of mass \(m\) moving with a speed \(v\) meets an unextended spring fixed at one end, and having a spring constant \(k.\) During maximum compression, the mid-point of the spring undergoes a rightward displacement \(x\). Then, \(v=\)
1. \(\sqrt{\frac{k}{m}}x\)
2. \(\sqrt{\frac{m}{k}}x\)
3. \(\sqrt{\frac{k}{m}}(2x)\)
4. \(\sqrt{\frac{k}{m}}\Big(\frac{x}{2}\Big)\)
1. \(\sqrt{\frac{k}{m}}x\)
2. \(\sqrt{\frac{m}{k}}x\)
3. \(\sqrt{\frac{k}{m}}(2x)\)
4. \(\sqrt{\frac{k}{m}}\Big(\frac{x}{2}\Big)\)
Subtopic: Â Work Done by Variable Force |
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
A particle undergoes an elastic collision with an identical particle at rest. After the collision, the two particles move with velocities \(\overrightarrow{v_1},~\overrightarrow{v_2}\). Final velocities \(\overrightarrow{v_1},~\overrightarrow{v_2}\) are in different directions. The angle between \(\overrightarrow{v_1}\) and \(\overrightarrow{v_2}\) is:
| 1. | \(\frac{\pi}{6}\) | 2. | \(\frac{\pi}{3}\) |
| 3. | \(\frac{\pi}{2}\) | 4. | \(\frac{2\pi}{3}\) |
Subtopic: Â Collisions |
 73%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
A block is moved along a horizontal plane by means of a force of constant magnitude of \(5\) N, but acting at an angle \(\theta\) which is proportional to the displacement (\(x\)): \(\theta=\frac{1}{2} x,\)
where \(x\) is in \(\text{m}\) and \(\theta\) is in radians. The work done by this force until the force becomes vertical is:
1. \(5\) J
2. \(10 \) J
3. \(2.5 \) J
4. \(1.25\) J
where \(x\) is in \(\text{m}\) and \(\theta\) is in radians. The work done by this force until the force becomes vertical is:
1. \(5\) J
2. \(10 \) J
3. \(2.5 \) J
4. \(1.25\) J
Subtopic: Â Work Done by Variable Force |
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
A horizontal force \(F\) acts on a \(2\) kg block placed on a smooth horizontal plane. It varies with time \(t\) as shown in the figure. The block is initially at rest.
The work done by the force until \(t=2\) s, equals:
1. \(6.25 \) J
2. \(4.5 \) J
3. \(2.25 \) J
4. \(1.5\) J
The work done by the force until \(t=2\) s, equals:
1. \(6.25 \) J
2. \(4.5 \) J
3. \(2.25 \) J
4. \(1.5\) J
Subtopic: Â Work Done by Variable Force |
 62%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
A car is driven by an engine that delivers constant power (except possibly at the initial instant). If it starts from rest, its displacement varies with time \((t)\) as:
1. \(t\)
2. \(\sqrt t\)
3. \(\frac{1}{\sqrt t}\)
4. \(t\sqrt t\)
1. \(t\)
2. \(\sqrt t\)
3. \(\frac{1}{\sqrt t}\)
4. \(t\sqrt t\)
Subtopic: Â Power |
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
The work done by gravity on a projectile of mass \(m\) fired with a speed \(u\) at an angle \(\theta\) to the horizontal, until the time of impact is:
| 1. | zero | 2. | \(-\frac12mu^2cos^2\theta\) |
| 3. | \(-\frac12mu^2sin^2\theta\) | 4. | \(-\frac12mu^2\) |
Subtopic: Â Work done by constant force |
 59%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
Select Chapter Topics:
© 2024 GoodEd Technologies Pvt. Ltd.