Gravitation Test

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Gravitation Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

The value of quantity G in the law of gravitation

A
depends on mass of the object

B
depends on radius of the earth only

C
depends on mass and radius of the earth

D
is independent of mass and radius of the earth
Question 2
1 / -0

The gravitational force between two objects is F. What will be the gravitational force between them, if the separation between them is doubled?

A
F

B

C

D
2F
Question 3
1 / -0

Object A exerts a gravitational force of magnitude 5.910^-11 N on object B. What is the magnitude of the gravitational force, if the separation distance increases to of its original value, m_A increases to of its original value, and m_B is halved?

A
2.510^-11N

B
3.310^-11 N

C
1.410^-10 N

D
1.610^-11 N
Question 4
1 / -0

The force of attraction between two objects placed at a certain distance is 124 N. What would be the force of attraction between them, if the separation between them is doubled?

A
62 N

B
248 N

C
31 N

D
496 N
Question 5
1 / -0

A mass m is placed inside a hollow sphere of mass M as shown in the figure. What is the gravitational force on mass m?

A

B

C

D
Zero
Question 6
1 / -0

Suppose F_g is the magnitude of the gravitational force between two people with a separation distance of 1.0 m. How would F_g change if the separation distance becomes 3.0 m?

A

B

C
3F_g

D
9F_g
Question 7
1 / -0

What is the magnitude and direction of the force of gravity acting on a body of mass 15 kg?
(Take g = 9.8 m/s²)

A
15 N, downwards

B
147 N, upwards

C
147 N, downwards

D
1.53 N, upwards
Question 8
1 / -0

The value of g at the centre of the earth is zero. What will be the weight of a body of mass `m` kg at the centre of the earth?

A
`m` newton

B
`10 m` newton

C
`` newton

D
Zero
Question 9
1 / -0

What would be the acceleration due to gravity of a planet which consists of a satellite whose mass is one-fourth and radius is half to that of earth?

A
4.9 ms^-2

B
9.8 ms^-2

C
19.6 ms^-2

D
29.4 ms^-2
Question 10
1 / -0

How much force and weight act on a mass of 20.4 kg being pulled by the earth?
(Take g = 10ms^-2)c

A
204 N, 20.4 kg

B
204 N, 204 kg

C
204 N, 204 N

D
20.4 N, 204 N
Question 11
1 / -0

There are two planets A and B. The mass of planet A is three times to that of planet B and the radius of planet A is two times to that of planet B. What is the ratio of their acceleration due to gravity?

A
3 : 2

B
3 : 4

C
6 : 2

D
2 : 3
Question 12
1 / -0

What will be acceleration due to gravity, if the mass of a planet is tripled and radius is halved?

A
3 times of its previous value

B
of its previous value

C
4 times of its previous value

D
12 times of its previous value
Question 13
1 / -0

A planet has twice the values of mass and radius of earth. What will be the acceleration due to gravity on the surface of the planet?

A
9.8 m/s²

B
39.2 m/s²

C
4.9 m/s²

D
2.45 m/s²
Question 14
1 / -0

If a body of mass `m` is taken to the bottom of a deep mine, then

A
its mass increases

B
its weight increases

C
its mass decreases

D
its weight decreases
Question 15
1 / -0

At what altitude would the acceleration due to gravity above the earth`s surface be half of its value on the surface of the earth?
(Take R = 4000 miles)

A
1200 miles

B
4000 miles

C
1600 miles

D
2000 miles
Question 16
1 / -0

The variation of acceleration due to gravity as one moves away from the earth`s centre is given by
(R = Radius of earth)

A

B

C

D
Question 17
1 / -0

A ball is released from a height and it reaches the ground in 6 s. What is the velocity with which the ball will strike the ground?
(Take g = 9.8 ms^-2)

A
58.8 ms^-1

B
7.7 ms^-1

C
29.4 ms^-1

D
1.6 ms^-1
Question 18
1 / -0

A car falls off a ledge and drops to the ground in 0.8 s. How high is the ledge from the ground?
(Take g = 10 ms^-2)

A
3.2 m

B
4 m

C
6.4 m

D
8 m
Question 19
1 / -0

A ball is dropped from a height of 20 m above the ground. What is the time taken by the ball to reach the ground?
(Take g = 10 ms^-2)

A
2 s

B
4 s

C
10 s

D
4.4 s
Question 20
1 / -0

A force of 40 N is applied on a nail, whose tip has an area of cross-section of 0.001 cm².
Calculate the pressure on the tip.

A
0.04 N/m²

B
4 10⁸ N/m²

C
4 10⁴ N/m²

D
4 N/m²