Gravitation Test

Result

Gravitation Test - 66

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

Find the false statement

A
Gravitational force acts along the line joining the two interacting particles

B
Gravitational force is independent of medium

C
Gravitational force forms an action-reaction pair

D
Gravitational force does not obey the principle of superposition
Question 2
1 / -0

A wooden cylinder is floating on water in a beaker which is placed in a lift. When the lift is at rest, one third of the volume of the wooden cylinder is exposed above water. the lift now moves up with an acceleration g/2. The fraction of the volume exposed now is :

A
1/3

B
1/2

C
1/6

D
2/3

Solution
Question 3
1 / -0

The ratio of the radius of a planet 'A' to that of planet 'B' is 'r'. The ratio of acceleration due to gravity on the planets is 'X'. The ratio of the escape velocities from the two planets is :

A
$$xt$$

B
$$\sqrt {\cfrac r x}$$

C
$$\sqrt{ r x}$$

D
$$\sqrt {\cfrac x r}$$

Solution
Question 4
1 / -0

The value of universal gravitational constant $$'G'$$ was first experimentally determined by :

A
Galileo

B
Newton

C
Cavendish

D
Kelvin

Solution

Cavendish experiment . The Cavendish experiment , performed in 1797–1798 by British scientist Henry Cavendish, was the first experiment to measure the force of gravity between masses in the laboratory and the first to yield accurate value for the gravitational constant
Hence,
option $$C$$ is correct answer.
Question 5
1 / -0

The weight of an object in the coal mine, sea level, at the top of the mountain are $$ W_1 , W_2$$ & $$W_3 $$ respectively, then :-

A
$$W_1 < W_2 > W_3$$

B
$$W_1 = W_2 = W_3$$

C
$$W_1 < W_2 < W_3$$

D
$$W_1 > W_2 > W_3$$

Solution
Question 6
1 / -0

The motion of planets in the solar system is an example of the conservation of

A
Mass

B
Linear momentum

C
Angular momentum

D
Energy

Solution

The motion of planets in the solar system is based on the conservation of angular momentum.
Question 7
1 / -0

Escape velocity on earth is $$11.2$$ km/s. What would be the escape velocity on planet whose mass is $$1000$$ times and radius is $$10$$ times that of earth :

A
$$112$$ km/s

B
$$11.2$$ km/s

C
$$1.12$$ km/s

D
$$3.7$$ km/s

Solution

Escaping velocity $$V_e=\sqrt{\dfrac{2GM}{R}}$$

$$\dfrac{v_p}{v_e} = \sqrt{\dfrac{M_p}{M_e} \dfrac{R_e}{R_p}}= \sqrt{(1000)\times \bigg( \dfrac{1}{10} \bigg)}= 10$$

$$v_p= 10 \times 11.2= 112 \ km/s$$
Question 8
1 / -0

A battery of weight $$60kg-wt$$ is bought from earth surface to a space station at height equal to $$R_e$$, the weight of battery at their.

A
$$45kg-wt$$

B
$$60kg-wt$$

C
$$30kg-wt$$

D
$$15kg-wt$$

Solution
Question 9
1 / -0

The escape velocity from earth is $$ V_e $$ A body is projected with velocity $$ 2V_e $$ with what constant velocity will it move in the interplanetary scape:

A
$$ V_e $$

B
$$ \sqrt 2 v_e $$

C
$$ \sqrt 3 v_e $$

D
$$ \sqrt 5 v_e $$

Solution
Question 10
1 / -0

Escape velocity is given by :

A
$$\sqrt{2 gR}$$

B
$$\sqrt {2g/R}$$

C
$$\sqrt{2} gR$$

D
$$\sqrt[2]{gR}$$

Solution