Gravitation Test

Result

Gravitation Test - 21

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

What is the density of water?

A
$$1000 g cm^{-3}$$

B
$$1 kg m^{-3}$$

C
$$1 g cm^{-3}$$

D
none of these.

Solution

The mass and size of the molecules in a liquid and how closely they are packed together determine the density of the liquid. Just like a solid, the density of a liquid equals the mass of the liquid divided by its volume. $$D = \dfrac{m}{v}$$. The density of water is 1 gram per cubic centimeter.
Question 2
1 / -0

When a solid block is fully immersed in water, the volume of the water displaced is:

A
greater than the volume ofthe block

B
less than the volume of the block

C
equal to the volume of the block

D
depends upon the manner in which the block is immersed in the liquid

Solution

Archimedes principle states that when a body is wholly or partially immersed in a fluid, it appears to suffer a loss in weight equal to the weight of the fluid it displaces.
Hence, when a solid block is fully immersed in water, the volume of the water is equal to the volume of the block as the density of water is unity in cgs.
Question 3
1 / -0

Acceleration due to gravity of a body during free fall does not depend upon the:

A
mass of earth

B
mass of body

C
universal gravitational constant

D
radius of earth

Solution

We know that: $$g=\dfrac{GM}{R^2}$$, where $$G=$$ gravitational constant, $$M=$$ mass of the earth and $$R=$$ radius of the earth.

So, $$g$$ does not depend on the mass of the falling body.
Question 4
1 / -0

------------ is the force of attraction between any two bodies in the universe.

A
Gravitation

B
Polarity

C
Induction

D
Joule

Solution

Any two objects attract each other with a force $$F_g=\dfrac{GMm}{R^2}$$ where $$G$$ is the gravitational constant, $$M$$ and $$m$$ the masses of the two bodies and $$R$$ is the distance along the line joining their centre of mass
Question 5
1 / -0

Mass is a _______ quantity and weight is a _______ quantity.

A
scalar, vector

B
vector, scalar

C
tensor, scalar

D
vector, vector

Solution

Mass: Mass is a measure of quantity of matter. hence it is a scalar quantity.
Weight: Force by which earth pulls an object is called weight of that object. Hence it is a vector quantity.
Hence Option A
Question 6
1 / -0

The S.I. units of thrust is same as that of

A
Force/Area

B
Force x Area

C
Force

D
None of these

Solution

When a system expels or accelerates mass in one direction, the accelerated mass will cause a force of equal magnitude but opposite direction on that system. The force applied on a surface in a direction perpendicular or normal to the surface is called thrust.
Thrust has the same unit as the force. That is, newton.
Question 7
1 / -0

In the relation F= $$\dfrac{G M m}{r^{2}}$$, the quantity $$G$$

A
depends on the value of g at the place of observation.

B
is used only when the earth is one of the two masses.

C
is greatest at the surface of the earth.

D
is universal constant in nature.

Solution

$$G$$ is the universal gravitational constant which remains constant at all places in the universe. $$G$$ is equivalent to the force of attraction between two bodies of unit mass and unit distance apart.
Question 8
1 / -0

The force of attraction between two unit point masses separated by a unit distance is called

A
Gravitational potential

B
Acceleration due to gravity.

C
Gravitational field

D
Universal gravitational constant.

Solution

Universal gravitational constant is the force of attraction between two bodies of unit mass and at a unit distance from each other.
Question 9
1 / -0

If the distance between two bodies is doubled then the force of gravitation acting between them becomes_______times of its initial value.

A
$$1/4 th$$

B
$$1/8 th$$

C
$$1/3 rd$$

D
two

Solution

We know that,
$$F_g=\dfrac{GMm}{(R)^2}$$
According to question, the Distance between two bodies is doubled.

$$F'_g=\dfrac{GMm}{(2R)^2}$$
On comparing above equations

$$F_g'=F_g/4$$

ie, 1/4 times of initial value.
Question 10
1 / -0

Which of the following is not true for Universal law of gravitation?

A
It is the gravitational force between the sun and the earth, which makes the earth move around the sun.

B
The tides formed in sea are because of gravitational pull exerted by the sun and the moon on the surface of water.

C
It is the gravitational pull of the earth which keeps us and other bodies firmly on the ground.

D
The gravitational force exerted by sun on earth is larger than that exerted by earth on sun.

Solution

Newton's law of universal gravitation states that any two bodies in the universe attract each other with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.
Hence , gravitational force exerted by sun on earth is exactly equal to that exerted by earth on sun

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Gravitation Test - 21

Result

Gravitation Test - 21

Score

-

Rank

-

SHARING IS CARING

Question 1

$$1000 g cm^{-3}$$

$$1 kg m^{-3}$$

$$1 g cm^{-3}$$

none of these.

Solution

Question 2

greater than the volume ofthe block

less than the volume of the block

equal to the volume of the block

depends upon the manner in which the block is immersed in the liquid

Solution

Question 3

mass of earth

mass of body

universal gravitational constant

radius of earth

Solution

Question 4

Gravitation

Polarity

Induction

Joule

Solution

Question 5

scalar, vector

vector, scalar

tensor, scalar

vector, vector

Solution

Question 6

Force/Area

Force x Area

Force

None of these

Solution

Question 7

depends on the value of g at the place of observation.

is used only when the earth is one of the two masses.

is greatest at the surface of the earth.

is universal constant in nature.

Solution

Question 8

Gravitational potential

Acceleration due to gravity.

Gravitational field

Universal gravitational constant.

Solution

Question 9

$$1/4 th$$

$$1/8 th$$

$$1/3 rd$$

two

Solution

Question 10

It is the gravitational force between the sun and the earth, which makes the earth move around the sun.

The tides formed in sea are because of gravitational pull exerted by the sun and the moon on the surface of water.

It is the gravitational pull of the earth which keeps us and other bodies firmly on the ground.

The gravitational force exerted by sun on earth is larger than that exerted by earth on sun.

Solution

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.