Gravitation Test

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Gravitation Test - 28

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Weekly Quiz Competition

Question 1
1 / -0

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

A
$$50 N$$

B
$$100 N$$

C
$$0.05 N$$

D
$$10 N$$

Solution

Thrust is the other name of force so if force = 50N then thrust = 50N
so option (A) is correct
Question 2
1 / -0

Give reason as to why relative density has no unit.

A
because its imaginary

B
because it is a ratio of two dimensionally same quantities

C
because it is a ratio of two dimensionally different quantities

D
none of these

Solution

We know relative density is a ratio of two densities. Hence it has no unit
Question 3
1 / -0

The upward force exerted by a liquid on an object is called _______.

A
Upward force

B
Top force

C
Buoyant force

D
Fluid force

Solution

When an object is immersed in a liquid then the liquid exerts a force in the upward direction, known as Buoyant force. It is an upward force exerted by a fluid that opposes the weight of an object immersed in a fluid.

Hence option (C) is correct.
Question 4
1 / -0

An object can be completely immersed in a liquid when:

A
The upward and downward forces are balanced.

B
The downward force is more than the upward force.

C
Both A and B

D
None of the above

Solution

The downward force acting on an object is the gravity of the earth and the upward force is the buoyant force exerted by the liquid on the object. The keep the liquid completely immersed in liquid the upward and downward force should either be balanced or the downward force must be more than the upwards force.
Question 5
1 / -0

Which of the following is true for the universal law of gravitation?
(a) It acts on all the objects irrespective of their nature, shape, and size
(b) $$F \propto M \times m$$
(c) It acts along the line joining the centers of the two objects.
(d) $$ F \propto\frac{1}{d^2}$$

A
a and c

B
b and d

C
a, b and d

D
All of the above

Solution

According to the universal law of gravitation, the force with which an object attracted another object is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.
$$\therefore F \propto\dfrac{M\times m}{d^2}$$;
i.e., $$F \propto M \times m$$ and $$F \propto \dfrac{1}{d^2}$$
It acts along the line joining the centers of those objects and it is said to be universal because it is applicable to all objects.
Question 6
1 / -0

The density of gold is $$19.32\:g/cm^3$$. Find its relative density.

A
14.52

B
26.71

C
19.32

D
18.74

Solution

relative density of gold = $$\dfrac{\rho _(gold)}{\rho_(water)}$$ = $$\dfrac{19.32}{1}$$ = 19.32
so option(C) is correct
Question 7
1 / -0

Archimedes' principle states that the buoyant force applied to an object

A
is greater the weight of the fluid the object displaces

B
is equal to the weight of the fluid the object displaces

C
is less than the weight of the fluid the object displaces

D
is zero

Solution

Archimedes' principle states that the buoyant force applied to an object is equal to the weight of the fluid that object displaces.
Hence Option B
Question 8
1 / -0

Who derived the Universal Law for Gravitation?

A
Newton

B
Galileo

C
Kepler

D
Einstein

Solution

Sir Isaac Newton derived the Universal Law of Gravitation.
Question 9
1 / -0

Why is the weight of an object less on the moon than on earth?

A
Density of moon is less than density of earth

B
Moon is a satellite of earth

C
Moon is far from earth

D
Moon's gravitational force is less than that of earth

Solution

The weight of an object is the gravitational force acting on it. Since, the gravitational force of the moon is $${\frac{1}{6}}^{th}$$ of earth. The weight of an object on moon is also $${\frac{1}{6}}^{th}$$ as compared to its weight on earth.
Question 10
1 / -0

Find the thrust exerted by a box of mass 2.5 kg:

A
-24.5 N

B
24.5 N

C
21.45 N

D
-25 N

Solution

Thrust is the fore exerted perpendicular to the surface
Thust,
$$F = m\times g$$
$$m = 2.5\ kg$$; mass of the box
$$g = 9.8\ ms^{-2}$$; acceleration due to gravity
$$\Rightarrow F= 2.5 \times 9.8 $$
$$\Rightarrow F=24.5N$$

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Re-Attempt Weekly Quiz Competition

Gravitation Test - 28

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Gravitation Test - 28

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SHARING IS CARING

Question 1

$$50 N$$

$$100 N$$

$$0.05 N$$

$$10 N$$

Solution

Question 2

because its imaginary

because it is a ratio of two dimensionally same quantities

because it is a ratio of two dimensionally different quantities

none of these

Solution

Question 3

Upward force

Top force

Buoyant force

Fluid force

Solution

Question 4

The upward and downward forces are balanced.

The downward force is more than the upward force.

Both A and B

None of the above

Solution

Question 5

a and c

b and d

a, b and d

All of the above

Solution

Question 6

14.52

26.71

19.32

18.74

Solution

Question 7

is greater the weight of the fluid the object displaces

is equal to the weight of the fluid the object displaces

is less than the weight of the fluid the object displaces

is zero

Solution

Question 8

Newton

Galileo

Kepler

Einstein

Solution

Question 9

Density of moon is less than density of earth

Moon is a satellite of earth

Moon is far from earth

Moon's gravitational force is less than that of earth

Solution

Question 10

-24.5 N

24.5 N

21.45 N

-25 N

Solution

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