Gravitation Test

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Gravitation Test - 24

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Weekly Quiz Competition

Question 1
1 / -0

If the weight of a body is 6 N on the moon, what will it be on the earth?

A
6 N

B
36 N

C
12 N

D
1 N

Solution

Answer is B.

Because the moon has less mass than Earth, the force due to gravity at the lunar surface is only about 1/6 of that on Earth.
In this case, the weight of a body is 6N on the moon. So, the weight of a body on earth is $$6 \times 6$$ N = 36 N.
Hence, the weight of a body is 36 N on the earth.
Question 2
1 / -0

When a body is taken from the earth to the moon:

A
its weight increases

B
its weight decreases

C
its weight remains unchanged

D
it becomes completely weightless

Solution

Gravity on moon is $$\dfrac{1}{6}$$ of that on the earth. So, if a body is taken to moon, the moon attracts the body with a force less as compared to the attraction force by the earth. Hence the weight decreases.
Question 3
1 / -0

Newton's law of gravitation holds good for

A
only small bodies

B
only terrestrial bodies

C
only big bodies

D
all types of bodies

Solution

Newton's law of gravitation holds for every type of body because when derived their is restriction for mass or radius of the body, also we can take example of earth law is valid for any body lying on earth so earth is big mass and body on earth is mall mass.
So law is valid for all type of bodies.
Hemce option D is true.
Question 4
1 / -0

Which one of the following statements is true?

A
Archimedes' principle can also be applied to gases

B
The buoyant force depends on the nature of object immersed in the liquid.

C
Ice floats in water because the density of ice is more than that of water.

D
Force acting on a unit area is called thrust.

Solution

Answer is A.

The Archimedes principle, states that the buoyant force exerted on a body immersed in a fluid is equal to the weight of the fluid the body displaces. In other words, to calculate the buoyant force on an object we assume that the submersed part of the object is made of water and then calculate the weight of that water.
This principle is valid for any fluid not only liquids (such as water) but also gases (such as air).

Hence, only the statement in option A is true.
Question 5
1 / -0

The liquid in which iron can float is:

A
Water

B
Kerosene

C
Mercury

D
Glycerine

Solution

Objects having a density less than that of the liquid in which they are immersed, float on the surface of the liquid. If the density of the object is more than the density of the liquid in which it is immersed then it sinks into the liquid.
The density of iron is less than the density of mercury. Iron floats on mercury.
Question 6
1 / -0

If the distance between two particles is halved, the gravitational force increases by

A
four times

B
two times

C
eight times

D
none of these

Solution

The gravitational force between two bodies $$F\propto \dfrac{1}{r^2}$$

Hence, when $$r$$ will become half then Force will increase four times.
Question 7
1 / -0

The force of gravitation exists.

A
Only at the surface of the earth

B
Everywhere in the universe

C
Only inside the earth

D
Only at the surface of the moon

Solution

Everybody having mass applies gravitational force on each other. It is inversely proportional to $$r^2$$ where $$r$$ is the distance between the. As distance increases force decreases. And when the body comes close to any heavy mass then its force is dominated but when goes away then force acting decreases and the force acting is balanced by other bodies surrounding the object so we got free space where we feel no force is acting on us.
But gravitation exists everywhere but decreases with distance.
Question 8
1 / -0

The value of G depends on

A
the nature of the interacting bodies

B
the size of the interacting bodies

C
the mass of the interacting bodies

D
none of these

Solution

G is symbol used for gravitational constant, it is a universal constant and independent from type, place, mass, density, volume everything.
it is always constant.
so option D is the answer.
Question 9
1 / -0

A rock has a mass of $$25 \ kg$$ on earth. What will be its mass on the moon? ($${g_{moon} = 1.6\ m/s^2}$$)

A
$$25 \ kg$$

B
$$2.5 \ kg$$

C
$$250 \ kg$$

D
$$40 \ kg$$

Solution

Mass is an inherent property of an object and does not change with change in position or state of matter. Mass of a body is always conserved.
Question 10
1 / -0

The force of gravitation between two bodies can be zero if the separation between the bodies becomes

A
1

B
0

C
-1

D
infinity

Solution

Gravitational force between two bodies of mass $$m$$ and $$m$$, separated by a distance $$r$$ is $$F=\dfrac{GMm}{r^2}$$
When $$r = \infty$$ then $$F=0$$ as $$\dfrac{1}{\infty}=0$$
So the correct answer is option D.

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Gravitation Test - 24

Result

Gravitation Test - 24

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SHARING IS CARING

Question 1

6 N

36 N

12 N

1 N

Solution

Question 2

its weight increases

its weight decreases

its weight remains unchanged

it becomes completely weightless

Solution

Question 3

only small bodies

only terrestrial bodies

only big bodies

all types of bodies

Solution

Question 4

Archimedes' principle can also be applied to gases

The buoyant force depends on the nature of object immersed in the liquid.

Ice floats in water because the density of ice is more than that of water.

Force acting on a unit area is called thrust.

Solution

Question 5

Water

Kerosene

Mercury

Glycerine

Solution

Question 6

four times

two times

eight times

none of these

Solution

Question 7

Only at the surface of the earth

Everywhere in the universe

Only inside the earth

Only at the surface of the moon

Solution

Question 8

the nature of the interacting bodies

the size of the interacting bodies

the mass of the interacting bodies

none of these

Solution

Question 9

$$25 \ kg$$

$$2.5 \ kg$$

$$250 \ kg$$

$$40 \ kg$$

Solution

Question 10

1

0

-1

infinity

Solution

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