Gravitation Test

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Gravitation Test - 32

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Weekly Quiz Competition

Question 1
1 / -0

When an object is immersed in water, it displaces $$20\,kg$$ of water. How much is the buoyant force acting on the object in Newtons?

A
$$100$$

B
$$200$$

C
$$0$$

D
$$400$$

Solution

According to the Archimedes principle, the buoyant force acting on an object immersed in liquid is equal to the weight of liquid it displaces. Hence the buoyant force acting on the given object=$$20kg\times 10m/s^2=200N$$
Question 2
1 / -0

What is the relation between thrust and pressure?

A
Pressure directly proportional to thrust

B
Pressure indirectly proportional to thrust

C
No relation

D
none

Solution

Hence pressure=$$P=\dfrac{Thrust}{Area}$$
$$\implies Pressure\propto Thrust$$
Question 3
1 / -0

Thrust is which type of force:

A
Parallel

B
Perpendicular

C
Both parallel and perpendicular

D
None

Solution

Since thrust is a force, it is a vector quantity having both a magnitude and a direction. The engine does work on the gas and accelerates the gas to the rear of the engine; the thrust is generated in the opposite direction from the accelerated gas.
The force which is perpendicular to the surface on which it is acted is called a thrust.
Question 4
1 / -0

Always an attractive force is acted between two bodies and this force depends upon the masses of the bodies and the distance between them. This force is:

A
inertia

B
unbalanced forces

C
action and reaction force pair

D
universal gravitation

E
restoring force

Solution

Newton's gravitational law states that there is always an attractive force between two bodies in universe and this force is directly proportional to the product of masses of two bodies and inversely proportional to square of the distance between the bodies ,this force is called universal gravitational force
$$F\propto\dfrac{mm'}{{r}^{2}}$$
where $$m$$ and $$m'$$ are the masses of bodies and $$r$$ is the distance between them.
therefore the given condition describes the universal gravitation.
Question 5
1 / -0

If the densities of two substances are equal, then what is the relative density of one substance with respect to another?

A
More than 1

B
Less than 1

C
1

D
None

Solution

Relative density is defined as the ratio of density of substance to density of given reference material.
$$\therefore$$ Relative density $$d_R =\dfrac{d_1}{d_2} = \dfrac{d}{d} = 1$$ $$(\because d_1 = d_2=d)$$
Question 6
1 / -0

A ball is dropped off a high building and strikes the ground with an impact velocity of 30 m/s. The height of the building is :

A
15 m

B
20 m

C
30 m

D
45 m

E
60 m

Solution

Given:
Initial velocity of the ball $$u = 0$$
Final velocity of the ball when it reaches the ground $$v = 30 m/s$$
Acceleration = Gravitational acceleration $$g = 10 \space m/s^2$$
Height $$h = ?$$
Using $$v^2 - u^2 = 2g h$$ where $$a = g = 10 m/s^2$$
$$\therefore$$ $$30^2 - 0^2 = 2 \times 10 \times h$$
$$\Rightarrow h = 45 \space m$$
Question 7
1 / -0

Fill in the blank.
As per Archimedes principle the buoyant force on a submerged object is equal to_______ of liquid displaced by object.

A
Height

B
Weight

C
Nature

D
Volume

Solution

According to the Archimedes principle, the buoyant force of a submerged object is equal to the weight of the liquid displaced.
$$\therefore$$ Buoyant force $$B = \rho gV$$ where $$\rho$$ and $$V$$ is the density of liquid and volume of liquid displaced respectively.
Question 8
1 / -0

What do you mean by Thrust or Buoyant force?

A
The upward force exerted by liquid when a body is immersed in the liquid

B
The downward force exerted by liquid when a body is immersed in the liquid

C
The upward force exerted by body when a body is immersed in the liquid

D
The downward force exerted by body when a body is immersed in the liquid

Solution

Thrust or Buoyant force is defined as the upward force exerted by liquid on the body when it is immersed in the liquid.
$$F_b = \rho\times V\times g$$
Question 9
1 / -0

What is known as thrust?

A
force orthogonal to an area

B
force acting along an area

C
any force

D
none of these

Solution

The force which is perpendicular to the surface on which it is acts is called a thrust.
A perpendicular force is also called 'normal' or 'orthogonal' to that surface.
Hence correct answer is option A.
Question 10
1 / -0

Why does a mug full of water feel lighter inside water?

A
Because of Buoyant force

B
Because of Gravitational force

C
Because of an increase in velocity

D
Because of its kinetic energy

Solution

When a mug full of water is placed into water, it experiences an upward thrust. This upward thrust is known as the buoyant force. According to the Archimedes' principle, this force is equal to the weight of the fluid that the body displaces.

Hence, the net force experienced by the mug will be,
$$F_{net} = F_{weight} - F_{upthrust}$$

As a result, it appears lighter when placed inside water.

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Gravitation Test - 32

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Gravitation Test - 32

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SHARING IS CARING

Question 1

$$100$$

$$200$$

$$0$$

$$400$$

Solution

Question 2

Pressure directly proportional to thrust

Pressure indirectly proportional to thrust

No relation

none

Solution

Question 3

Parallel

Perpendicular

Both parallel and perpendicular

None

Solution

Question 4

inertia

unbalanced forces

action and reaction force pair

universal gravitation

restoring force

Solution

Question 5

More than 1

Less than 1

1

None

Solution

Question 6

15 m

20 m

30 m

45 m

60 m

Solution

Question 7

Height

Weight

Nature

Volume

Solution

Question 8

The upward force exerted by liquid when a body is immersed in the liquid

The downward force exerted by liquid when a body is immersed in the liquid

The upward force exerted by body when a body is immersed in the liquid

The downward force exerted by body when a body is immersed in the liquid

Solution

Question 9

force orthogonal to an area

force acting along an area

any force

none of these

Solution

Question 10

Because of Buoyant force

Because of Gravitational force

Because of an increase in velocity

Because of its kinetic energy

Solution

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