Default Title

Question (1)

QN0035436

Consider Earth to be a homogeneous sphere. Scientist A goes deep down in a mine and scientist B goes high up in a balloon. The gravitational field measured by

(A)
A goes on decreasing and that by B goes on increasing
(B)
B goes on decreasing and that by A goes on increasing
(C)
each decreases at the same rate
(D)
each decreases at different rates

Correct Answer: D

Explanation:

Both decreases but variation are different.

Link:

Report Error

Question (2)

QN0035437

In some region, the gravitational field is zero. Gravitational potential in this region.

(A)
must be variable
(B)
must be constant
(C)
cannot be zero
(D)
must be zero

Correct Answer: B

Explanation:

. If then constant

Link:

Report Error

Question (3)

QN0035438

In a gravitational field, at a point where the gravitational potential is zero

(A)
the gravitational field is necessarily zero
(B)
the gravitational field is not necesarily zero
(C)
any value between one and infinite
(D)
None of these

Correct Answer: A

Explanation:

Link:

Report Error

Question (4)

QN0035439

A particle of mass is situated at the centre of a spherical shell of same mass and radius . The gravitational potential at a point situated at distance from the centre, will be:

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

Correct Answer: A

Explanation:

Potential at the given point Potential at the point due to the shell + Potential due to the particle

Link:

Report Error

Question (5)

QN0035440

Assuming the radius of the earth as , the change in gravitational potential energy of a body of mass , when it is taken from the earth's surface to a height above its surface, is

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

Correct Answer: B

Explanation:

Gravitational potential energy (GPE) on the surface of earth,

at

Change in GPE

Link:

Report Error

Question (6)

QN0035441

The potential energy of a rock, having mass and rotating at a height of from the earth surface, is

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

Correct Answer: B

Explanation:

Mass of the satellite and height of rock from earth

We know that gravitational potential energy of the rock rotating at height

(where, and )

Link:

Report Error

Question (7)

QN0035442

The gravitational potential energy associated with two particles separated by a distance , when , is given by

(A)
(B)
(C)
zero
(D)
infinity

Correct Answer: C

Explanation:

Gravitational potential energy associated with two particles of masses separated by distance is given by

if .

Link:

Report Error

Question (8)

QN0035443

Four spheres each of mass form a square of side (as shown in figure). A fifth sphere of mass is situated at the centre of square. The total gravitational potential energy of the system is:

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

Correct Answer: A

Explanation:

Link:

Report Error

Question (9)

QN0035444

The gravitational potential due to a hollow sphere (mass , radius ) varies with distance from centre as

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

Correct Answer: B

Explanation:

for and , for , and so option (b) is correct.

Link:

Report Error

Question (10)

QN0035445

If ' ' is the acceleration due to gravity on the earth's surface, the gain in the potential energy of an object of mass ' ' raised from the surface of the earth to a height equal to the radius ' ' of the earth is

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

Correct Answer: B

Explanation:

Link:

Report Error

Question (1)

Consider Earth to be a homogeneous sphere. Scientist A goes deep down in a mine and scientist B goes high up in a balloon. The gravitational field measured by

Explanation:

Link:

Question (2)

In some region, the gravitational field is zero. Gravitational potential in this region.

Explanation:

Link:

Question (3)

In a gravitational field, at a point where the gravitational potential is zero

Explanation:

Link:

Question (4)

A particle of mass is situated at the centre of a spherical shell of same mass and radius . The gravitational potential at a point situated at distance from the centre, will be:

Explanation:

Link:

Question (5)

Assuming the radius of the earth as , the change in gravitational potential energy of a body of mass , when it is taken from the earth's surface to a height above its surface, is

Explanation:

Link:

Question (6)

The potential energy of a rock, having mass and rotating at a height of from the earth surface, is

Explanation:

Link:

Question (7)

The gravitational potential energy associated with two particles separated by a distance , when , is given by

Explanation:

Link:

Question (8)

Four spheres each of mass form a square of side (as shown in figure). A fifth sphere of mass is situated at the centre of square. The total gravitational potential energy of the system is:

Explanation:

Link:

Question (9)

The gravitational potential due to a hollow sphere (mass , radius ) varies with distance from centre as

Explanation:

Link:

Question (10)

If ' ' is the acceleration due to gravity on the earth's surface, the gain in the potential energy of an object of mass ' ' raised from the surface of the earth to a height equal to the radius ' ' of the earth is

Explanation:

Link:

Excel With Tutors

ExcelWithTutors

For Student

For Tutors

Learn

OUR POLICY