Recommended PYQs (STRICTLY NCERT Based) Work, Energy and Power Physics NEET Practice Questions, MCQs, Past Year Questions (PYQs), NCERT Questions, Question Bank, Class 11 and Class 12 Questions, and PDF solved with answers

Two bodies

A

$A$ and

B

$B$ of the same mass undergo completely inelastic one-dimensional collision. The body

A

$A$ moves with velocity

v_{1}

$v_1$ while the body

B

$B$ is at rest before collision. The velocity of the system after collision is

v_{2} .

$v_2.$ The ratio of

v_{1} : v_{2}

$v_1:v_2$ is:
1.

2 : 1

$2:1$
2.

4 : 1

$4:1$
3.

1 : 4

$1:4$
4.

1 : 2

$1:2$

Subtopic: Collisions |

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Q2:

At any instant of time

t,

$t,$ the displacement of any particle is given by

2 t - 1

$2t-1$ (SI unit) under the influence of the force of

5 N .

$5~\text N.$ The value of instantaneous power (in SI units) is:
1.

5

$5$
2.

7

$7$
3.

6

$6$
4.

10

$10$

Subtopic: Power |

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Q3:

The object

A

$A$ has half the kinetic energy as that of the object

B .

$B.$ The object

B

$B$ has half the mass as that of the object

A .

$A.$ The object

A

$A$ speeds up by

1 {ms}^{- 1}

$1~\text{ms}^{-1}$ and then has the same kinetic energy as that of the object

B .

$B.$ The initial speed of the object

A

$A$ is:
(Take

\sqrt{2} ≅ 1.4

$\sqrt2\cong1.4$ )
1.

0.5 {ms}^{- 1}

$0.5~\text{ms}^{-1}$
2.

1 {ms}^{- 1}

$1~\text{ms}^{-1}$
3.

2.5 {ms}^{- 1}

$2.5~\text{ms}^{-1}$
4.

4.8 {ms}^{- 1}

$4.8~\text{ms}^{-1}$

Subtopic: Work Energy Theorem |

52%

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Q4:

A particle is displaced through

(3 \hat{i} + 4 \hat{j}) m

$(3 \hat{i}+4 \hat{j})~\text{m}$ by force

2 \hat{i} N

$2 \hat{i}~\text{N}$ . The work done is:
1.

14 J

$14~\text{J}$
2.

8 J

$8~\text{J}$
3.

6 J

$6~\text{J}$
4.

10 J

$10~\text{J}$

Subtopic: Work done by constant force |

86%

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Q5:

An object is moving along the horizontal

x -

$x\text-$ direction with an initial kinetic energy of

10 J .

$10~\text J.$ It is displaced through

x = (3 \hat{i}) m

$x=(3\hat{i})~\text{m}$ under the influence of a force

\vec{F} = (- 2 \hat{i} + 3 \hat{j}) N .

$\vec{{{F}}}=(-2\hat{i}+3\hat{j})~\text N.$ The kinetic energy of the object at the end of the displacement

x

$x$ is:

1.	$10~\text{J}$	2.	$16~\text J$
3.	$4~\text J$	4.	$6~\text J$

Subtopic: Work Energy Theorem |

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Q6:

An object falls from a height of

10 m

$10~\text m$ above the ground. After striking the ground it loses

50 %

$50\%$ of its kinetic energy. The height up to which the object can re-bounce from the ground is:

1.	$7.5~\text m$	2.	$10~\text m$
3.	$2.5~\text m$	4.	$5~\text m$

Subtopic: Gravitational Potential Energy |

67%

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Q7:

The potential energy of a long spring when stretched by

2 cm

$2~\text{cm}$ is

U .

$U.$ If the spring is stretched by

8 cm,

$8~\text{cm},$ the potential energy stored in it will be:

1.	$16U$	2.	$2U$
3.	$4U$	4.	$8U$

Subtopic: Elastic Potential Energy |

75%

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Q8:

A bullet from a gun is fired on a rectangular wooden block with velocity

u

$u$ . When bullet travels

24

$24$ cm through the block along its length horizontally, velocity of bullet becomes

u / 3

$u/3$ . Then it further penetrates into the block in the same direction before coming to rest exactly at the other end of the block. The total length of the block is:

1.	$30$ cm	2.	$27$ cm
3.	$24$ cm	4.	$28$ cm

Subtopic: Work Energy Theorem |

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Q9:

A bullet of mass

m

$m$ hits a stationary block of mass

M

$M$ elastically. The transfer of energy is the maximum, when:
1.

M = m

$M=m$
2.

M = 2 m

$M=2m$
3.

M ≪ m

$M\ll m$
4.

M ≫ m

$M\gg m$

Subtopic: Collisions |

56%

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Q10:

A particle moves with a velocity

(5 \hat{i} - 3 \hat{j} + 6 \hat{k}) {ms}^{- 1}

$(5\hat i-3\hat j+6\hat k)~\text{ms}^{-1}$ horizontally under the action of a constant force

(10 \hat{i} + 10 \hat{j} + 20 \hat{k}) N .

$(10\hat i+10\hat j+20\hat k)~\text N.$ The instantaneous power supplied to the particle is:

1.	$200~\text W$	2.	zero
3.	$100~\text W$	4.	$140~\text W$

Subtopic: Power |

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