Default Title

Question (1)

QN0035172

Work done by a conservative force is positive if

(A)
P.E. of the body increase
(B)
P.E. of the body decreases
(C)
K.E. of the body increases
(D)
K.E. of the body decreases

Correct Answer: B

Explanation:

Link:

Report Error

Question (2)

QN0035173

For a conservative force in one dimension, potential energy function is related to the force as

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

Correct Answer: A

Explanation:

Conservative force is negative gradient of potential

Link:

Report Error

Question (3)

QN0035174

One man takes . to raise a box to a height of 1 metre and another man takes . to do so. The energy of the

(A)
two is different
(B)
two is same
(C)
first is more
(D)
second is more

Correct Answer: B

Explanation:

Energy required

In both cases, is the same. Hence energy both is the same.

Link:

Report Error

Question (4)

QN0035175

A ball dropped from a height of reaches to a height of before hitting the ground. Then the percentage of potential energy lost is

(A)
25
(B)
30
(C)
50
(D)
100

Correct Answer: A

Explanation:

and

energy lost

Link:

Report Error

Question (5)

QN0035176

The potential energy of a system increases if work is done

(A)
upon the system by a non conservative force
(B)
by the system against a conservative force
(C)
by the system against a non conservative force
(D)
upon the system by a conservative force

Correct Answer: D

Explanation:

When work is done upon a system by a conservative force then its potential energy increases.

Link:

Report Error

Question (6)

QN0035177

The figure gives the potential energy function for a system in which a particle is in one-dimensional motion. In which region the magnitude of the force on the particle is greatest :

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

Correct Answer: D

Explanation:

, which is greatest in the reagion .

Link:

Report Error

Question (7)

QN0035178

A rod of mass and length is made to stand at an angle of with the vertical. Potential energy of the rod in this position is

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

Correct Answer: D

Explanation:

For any uniform rod, the mass is supposed to be concentrated at its centre.

height of the mass from ground is,

Potential energy of the rod

Link:

Report Error

Question (8)

QN0035179

The potential energy of a conservative system is given by , where represents the position of the particle and as well as are constants. What is the force acting on the system?

(A)
- ay
(B)
- by
(C)
2ay - b
(D)
b-2ay

Correct Answer: D

Explanation:

Link:

Report Error

Question (9)

QN0035180

A body falls freely under gravity. Its velocity is when it has lost potential energy equal to . What is the mass of the body?

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

Correct Answer: C

Explanation:

Link:

Report Error

Question (1)

Work done by a conservative force is positive if

Explanation:

Link:

Question (2)

For a conservative force in one dimension, potential energy function is related to the force as

Explanation:

Link:

Question (3)

One man takes . to raise a box to a height of 1 metre and another man takes . to do so. The energy of the

Explanation:

Link:

Question (4)

A ball dropped from a height of reaches to a height of before hitting the ground. Then the percentage of potential energy lost is

Explanation:

Link:

Question (5)

The potential energy of a system increases if work is done

Explanation:

Link:

Question (6)

The figure gives the potential energy function for a system in which a particle is in one-dimensional motion. In which region the magnitude of the force on the particle is greatest :

Explanation:

Link:

Question (7)

A rod of mass and length is made to stand at an angle of with the vertical. Potential energy of the rod in this position is

Explanation:

Link:

Question (8)

The potential energy of a conservative system is given by , where represents the position of the particle and as well as are constants. What is the force acting on the system?

Explanation:

Link:

Question (9)

A body falls freely under gravity. Its velocity is when it has lost potential energy equal to . What is the mass of the body?

Explanation:

Link:

Excel With Tutors

ExcelWithTutors

For Student

For Tutors

Learn

OUR POLICY