Select Chapter Topics:

1. \(3:1\)

2. \(1:4\)

3. \(1:1\)

4. \(1:3\)

Subtopic: Â Collisions |

Â 63%

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NEET - 2022

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A force of \(100\) N acts on a block, always acting opposite to its velocity. The block moves from \(x=4\) m to \(x=10\) m and then to \(x=6\) m. The work done by the force is:

1. \(200\) J

2. \(-200\) J

3. \(1000\) J

4. \(-1000\) J

1. \(200\) J

2. \(-200\) J

3. \(1000\) J

4. \(-1000\) J

Subtopic: Â Work done by constant force |

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The work done by a force \(F=2x^2\) (newton) in a displacement from \(x=0\) (origin) to \(x=3\) m is:

1. \(54\) J

2. \(27\) J

3. \(18\) J

4. \(9\) J

1. \(54\) J

2. \(27\) J

3. \(18\) J

4. \(9\) J

Subtopic: Â Work Done by Variable Force |

Â 83%

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A gravitational field is present in a region and a mass is shifted from \(A\) to \(B\) through different paths as shown. If \(W_1\), \(W_2\) and \(W_3\) represent the work done by the gravitational force along their respective paths, then:

1. | \(W_1=W_2=W_3\) | 2. | \(W_1>W_2>W_3\) |

3. | \(W_1>W_3>W_2\) | 4. | \(W_1<W_2<W_3\) |

Subtopic: Â Gravitational Potential Energy |

Â 85%

From NCERT

NEET - 2022

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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 |

Â 59%

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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 |

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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 |

Â 62%

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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 |

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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. \(\dfrac{\pi}{6}\)

2. \(\dfrac{\pi}{3}\)

3. \(\dfrac{\pi}{2}\)

4. \(\dfrac{2\pi}{3}\)

The angle between \(\overrightarrow{v_1}\) and \(\overrightarrow{v_2}\) is:

1. \(\dfrac{\pi}{6}\)

2. \(\dfrac{\pi}{3}\)

3. \(\dfrac{\pi}{2}\)

4. \(\dfrac{2\pi}{3}\)

Subtopic: Â Collisions |

Â 73%

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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

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