Gravitation Test

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Gravitation Test - 26

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Weekly Quiz Competition

Question 1
1 / -0

The SI unit of thrust is

A
N

B
dyne

C
kgwt

D
$$Nm^{-2}$$

Solution

The force acting on an object perpendicular to the surface is called thrust. It is a vector quantity and SI unit of thrust is Newton.

So option (A) is correct.
Question 2
1 / -0

If the symbols have their usual meanings then $$\dfrac {gR^2}{M}$$ represents.

A
$$G$$

B
$$G^2$$

C
$$\dfrac {1}{G}$$

D
$$\dfrac {1}{G^2}$$

Solution

We know that the acceleration due to the gravity of a planet is $$g=\dfrac{GM}{R^2}$$, where $$G$$ is the gravitational constant, $$M$$ is the mass of the planet and $$R$$ is the radius of the planet.
$$\Rightarrow \dfrac{gR^2}{M}=G $$

Hence the correct answer is option $$A $$.
Question 3
1 / -0

Any solid will float in water if its relative density is :

A
greater than unity

B
equal to unity

C
less than unity

D
infinite

Solution

A body with a density less than that of water will float in water.
Now we know for a body, its relative density $$=\dfrac{\text{density of the body}}{\text{density of water}}$$

Hence a body with relative density or specific gravity less than $$1$$ will float in water.
Question 4
1 / -0

If the density of a metal is 8.2 g/cc, its relative density is.

A
8.2

B
1/8.2

C
0.082

D
820
Question 5
1 / -0

The gravitational attraction between the two bodies increases when their masses are

A
reduced and distance is reduced

B
increased and distance is reduced

C
reduced and distance is increased

D
increased and distance is increased

Solution

$$F = \dfrac{Gm_1m_2}{r^2}$$, here F is the gravitational force of attraction which increases when masses are increased (directly proportional) and distance is reduced (indirectly proportional).
Question 6
1 / -0

A force of 50 N is applied on a nail of area 0.001 sq cm. Then the thrust on the nail is equal to

A
$$50$$ N

B
$$100$$ N

C
$$0.05$$ N

D
$$10$$ N

Solution

The force applied on a surface in a direction perpendicular or normal to the surface is called thrust.
Hence $$Force=Thrust$$ (1)
Given: $$Force=50N$$ (2)
From (1) and (2)
$$Thrust=50N$$
Question 7
1 / -0

Any solid will sink in water, if its relative density is :

A
less than unity

B
equal to unity

C
greater than unity

D
zero

Solution

A substance with a density greater than that of water will sink in water.

Hence a substance with relative density greater than unity will sink.
Question 8
1 / -0

The total force exerted by a body perpendicular to a surface is called.

A
Pressure

B
Thrust

C
Impulse

D
Collision

Solution

Thrust is defined as the force exerted by a body perpendicular to a surface.
Hence, option (B) is correct
Question 9
1 / -0

The upward force acting on the body immersed in a fluid is called :

A
equilibrium force

B
buoyant force

C
true weight

D
net force

Solution

Buoyancy or buoyant force is equal to the upward force acting on the body immersed in the liquid. It is an upward force exerted by a fluid that opposes the weight of an immersed body.
Option B is correct.
Question 10
1 / -0

A force of 50 N is applied on a nail of area $$0.001\ cm^2$$. Then the thrust applied is:

A
$$50\ N$$

B
$$100\ N$$

C
$$0.05\ N$$

D
$$10\ N$$

Solution

Thrust is the upward force.
Here value of force is $$50\ N$$
So, the thrust $$=50\ N$$

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Gravitation Test - 26

Result

Gravitation Test - 26

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SHARING IS CARING

Question 1

N

dyne

kgwt

$$Nm^{-2}$$

Solution

Question 2

$$G$$

$$G^2$$

$$\dfrac {1}{G}$$

$$\dfrac {1}{G^2}$$

Solution

Question 3

greater than unity

equal to unity

less than unity

infinite

Solution

Question 4

8.2

1/8.2

0.082

820

Question 5

reduced and distance is reduced

increased and distance is reduced

reduced and distance is increased

increased and distance is increased

Solution

Question 6

$$50$$ N

$$100$$ N

$$0.05$$ N

$$10$$ N

Solution

Question 7

less than unity

equal to unity

greater than unity

zero

Solution

Question 8

Pressure

Thrust

Impulse

Collision

Solution

Question 9

equilibrium force

buoyant force

true weight

net force

Solution

Question 10

$$50\ N$$

$$100\ N$$

$$0.05\ N$$

$$10\ N$$

Solution

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