Gravitation Test

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Gravitation Test - 19

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Weekly Quiz Competition

Question 1
1 / -0

The cause of floating of clouds in atmosphere is:

A
low viscosity.

B
low temperature.

C
low pressure.

D
low density.

Solution

Clouds are made of water vapour which is less dense than air. So buoyant force dominates the force of gravity and makes clouds reach such a height where the density of air is equal to the density of water vapour. So the correct answer is 'D'.
Question 2
1 / -0

The density of a substance is $$7100 kg m^{-3}$$, its relative density is :

A
$$7100$$

B
$$71$$

C
$$7.1$$

D
$$71\times 105$$

Solution

Given: Density of the substance: $$7100\ kg/m^3$$, Density of water at $$4^oC$$ = $$1000\ kg/m^3$$

$$Relative \ density = \dfrac{Density \ of \ substance}{Density \ of \ water\ at\ 4^oC}$$

$$=\dfrac{7100}{1000}=7.1$$

Hence, option C is correct.
Question 3
1 / -0

Buoyant force exerted by a fluid on a given body is :

A
equal to the volume of body

B
equal to the weight of body

C
equal to the volume of fluid displaced by the body

D
equal to the weight of fluid displaced by the body

Solution

Buoyant Force is an upward force exerted by a fluid that opposes the weight of an immersed object. The magnitude of this upward force is given by Archimedes' principle which states that:
When a body is immersed fully or partially in a fluid, it experiences an upward force that is equal to the weight of the fluid displaced by it.

So option D is correct.
Question 4
1 / -0

When a body is fully immersed in a liquid the apparent loss in the weight of body is equal to :

A
volume of liquid displaced by the body

B
density of the liquid

C
weight of liquid displaced by the body

D
none of these

Solution

According to Archimedes principle, the weight of water displaced is equal to the weight of immersed part.For a solid floating in a liquid, its weight acting vertically down at its centre of gravity is equal to the weight of the liquid displaced by the immersed part of the solid acting vertically up at its centre of buoyancy. In the floating condition, the apparent weight and the apparent density of the solid are zero and the body is said to be weightless.
Question 5
1 / -0

Buoyant force experienced by a solid is _____ the weight of the fluid displaced by it

A
more than

B
less than

C
equal to

D
cant say

Solution

Archimedes principle states that the weight of the fluid displaced by a body that is immersed in a fluid will be equal to the force the fluid applies to the body in the opposite direction of gravity.
Question 6
1 / -0

When a solid is completely immersed in a fluid, the apparent loss of weight of solid is _______ weight of fluid displaced

A
more than

B
less than

C
equal to

D
cant say

Solution

From the principle of Archimedes, loss of weight is equal to the weight of the liquid displaced.
Question 7
1 / -0

State the S.I. units of mass and weight.

A
g and kg

B
kg and g

C
kg and N

D
N and kg

Solution

SI unit of Mass $$= kg$$
SI unit of weight $$= Newton(N)$$
Question 8
1 / -0

How are $$g$$ and $$G$$ related?

A
$$g=\dfrac{GM}{R^3}$$

B
$$g=\dfrac{M}{GR^2}$$

C
$$g=\dfrac{GM}{R^2}$$

D
$$g=\dfrac{GM}{R}$$

Solution

Acceleration due to gravity is given by:
$$g = \dfrac{GM}{r^{2}}$$
where:
$$r:$$ distance
$$G:$$ Gravitaional constant ($$G=6.673 \times 10^{-11} Nm^{2} kg^{-2}$$)
$$M:$$ Mass of the object
Question 9
1 / -0

Newton universal law of gravitation applies to:

A
small bodies only

B
planets only

C
both small and big bodies

D
only valid for solar system

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. Since any two bodies can be there so it doesn't matter whether they are small or large.
So, It is applicable to both small and big bodies.
Question 10
1 / -0

Thrust is a $$\underline{ }$$ quantity

A
vector

B
scalar

C
both A and B

D
can't say

Solution

The force acting on an object perpendicular to the surface is called thrust. Since it is a force and it has direction so it is vector quantity and SI Unit of thrust is Newton.

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Gravitation Test - 19

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Gravitation Test - 19

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SHARING IS CARING

Question 1

low viscosity.

low temperature.

low pressure.

low density.

Solution

Question 2

$$7100$$

$$71$$

$$7.1$$

$$71\times 105$$

Solution

Question 3

equal to the volume of body

equal to the weight of body

equal to the volume of fluid displaced by the body

equal to the weight of fluid displaced by the body

Solution

Question 4

volume of liquid displaced by the body

density of the liquid

weight of liquid displaced by the body

none of these

Solution

Question 5

more than

less than

equal to

cant say

Solution

Question 6

more than

less than

equal to

cant say

Solution

Question 7

g and kg

kg and g

kg and N

N and kg

Solution

Question 8

$$g=\dfrac{GM}{R^3}$$

$$g=\dfrac{M}{GR^2}$$

$$g=\dfrac{GM}{R^2}$$

$$g=\dfrac{GM}{R}$$

Solution

Question 9

small bodies only

planets only

both small and big bodies

only valid for solar system

Solution

Question 10

vector

scalar

both A and B

can't say

Solution

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