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Question (1)

QN0035150

A light and a heavy body have equal momentum. Which one has greater K.E.?

(A)
The lighter body
(B)
The heavier body
(C)
Both have equal K.E.
(D)
Data given is incomplete

Correct Answer: A

Explanation:

Since momentum of both bodies are equal

So let

so

It means that light body has greater kinetic energy, if they. have equal momentum.

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Question (2)

QN0035151

A particle of mass has momentum . Its kinetic energy will

(A)
(B)
(C)
(D)

Correct Answer: D

Explanation:

Let the velocity of the particle be .

Momentum of the particle

Kinetic energy of the particle

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Question (3)

QN0035152

Kinetic energy, with any reference, must be

(A)
zero
(B)
positive
(C)
negative
(D)
both (b) and (c)

Correct Answer: B

Explanation:

K. It is always positive

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Question (4)

QN0035153

If the momentum of a body is increased by , then the percentage increase in its kinetic energy is

(A)
(B)
(C)
(D)

Correct Answer: C

Explanation:

Initial momentum ; Final momentum and initial kinetic energy .

Kinetic energy

or, or, .

Therefore, increase in kinetic energy is or .

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Question (5)

QN0035154

Four particles given, have same momentum. Which has maximum kinetic energy

(A)
Proton
(B)
Electron (c)
(C)
Deutron
(D)
-particles

Correct Answer: B

Explanation:

[If constant] i.e., the lightest particle will possess maximum kinetic energy and in the given option mass of electron is minimum.

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Question (6)

QN0035155

The K.E. acquired by a mass in travelling a certain distance , starting form rest, under the action of a constant force is directly proportional to

(A)
(B)
(C)
(D)
independent of

Correct Answer: D

Explanation:

K.E.

Further,

Hence, K.E.

or, K.E. acquired Work done constant.

i.e., it is independent of mass .

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Question (7)

QN0035156

A running man has half the kinetic energy of that of a boy of half of his mass. The man speeds up by so as to have same K.E. as that of the boy. The original speed of the man will be

(A)
(B)
(C)
(D)

Correct Answer: C

Explanation:

Let mass of boy, mass of man

velocity of boy, velocity of man

Putting and solving

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Question (8)

QN0035157

In the given figure, the block of mass is dropped from the point ' '. The expression for kinetic energy of block when it reaches point ' ' is :

(A)
(B)
(C)
(D)

Correct Answer: D

Explanation:

By law of conservation of mechanical energy

and

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Question (9)

QN0035158

Two bodies and having masses in the ratio of possess the same kinetic energy. The ratio of linear momentum of to is

(A)
(B)
(C)
(D)

Correct Answer: C

Explanation:

As

;

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Question (10)

QN0035159

A small body is projected in a direction inclined at to the horizontal with kinetic energy . At the top of its flight, its kinetic energy will beA small body is projected in a direction inclined at to the horizontal with kinetic energy . At the top of its flight, its kinetic energy will be

(A)
Zero
(B)
(C)
(D)

Correct Answer: B

Explanation:

At the top of flight, horizontal component of velocity

K.E. .

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Question (1)

A light and a heavy body have equal momentum. Which one has greater K.E.?

Explanation:

Link:

Question (2)

A particle of mass has momentum . Its kinetic energy will

Explanation:

Link:

Question (3)

Kinetic energy, with any reference, must be

Explanation:

Link:

Question (4)

If the momentum of a body is increased by , then the percentage increase in its kinetic energy is

Explanation:

Link:

Question (5)

Four particles given, have same momentum. Which has maximum kinetic energy

Explanation:

Link:

Question (6)

The K.E. acquired by a mass in travelling a certain distance , starting form rest, under the action of a constant force is directly proportional to

Explanation:

Link:

Question (7)

A running man has half the kinetic energy of that of a boy of half of his mass. The man speeds up by so as to have same K.E. as that of the boy. The original speed of the man will be

Explanation:

Link:

Question (8)

In the given figure, the block of mass is dropped from the point ' '. The expression for kinetic energy of block when it reaches point ' ' is :

Explanation:

Link:

Question (9)

Two bodies and having masses in the ratio of possess the same kinetic energy. The ratio of linear momentum of to is

Explanation:

Link:

Question (10)

A small body is projected in a direction inclined at to the horizontal with kinetic energy . At the top of its flight, its kinetic energy will beA small body is projected in a direction inclined at to the horizontal with kinetic energy . At the top of its flight, its kinetic energy will be

Explanation:

Link:

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