force of gravity, solids and fluids - Category wise Question and Answer Practice Test with Solutions

Question : 16

Assertion (A)
Gravitational attraction is a central force and therefore in motion of planets in the solar system, the angular momentum is conserved.
Reason (R)
In the motion of planets of the solar system, equal areas are swept in equal time.

a) A is true but R is false

b) Both A and R are true but R is not the correct explanation of A

c) Both A and R are ture and R is the correct explanation of A

d) A is false but R is true

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Question : 17 [IAS Prelim]

Assertion (A):
An iron ball floats on mercury but gets immersed in water.
Reason (R) :
The specific gravity of iron is more than that of mercury.

a) A is true but R is false

b) Both A and R are true but R is not a correct explanation of A

c) Both A and R are true and R is the correct explanation of A

d) A is false but R is true

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Question : 18 [SSC CGL]

A body is at rest on the surface of earth. Which of the following statements is correct?

a) Frictional force acts on the body.

b) Only upward force acts on the body.

c) Only weight of the body acts on it.

d) Net upward force is equal to the net downward force.

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Question : 19

Assertion (A) :
A beaker filled with water at 4°C overflows if the temperature is decreased or increased.
Reason (R) :
Density of water is maximum at 4°C.

a) A is true but R is false

b) Both A and R are true but R is not a correct explanation of A

c) Both A and R are true and R is the correct explanation of A

d) A is false but R is true

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Question : 20

Match the Column I and Column II.

Choose the correct option from the codes given below for (A), (B), (C), (D).

a) (A) → (3) ; (B) → (1) ; (C) → (4) ; (D) → (2)

b) (A) → (2) ; (B) → (2) ; (C) → (4) ; (D) → (3)

c) (A) → (2) ; (B) → (1) ; (C) → (3) ; (D) → (4)

d) (A) → (4) ; (B) → (3) ; (C) → (1) ; (D) → (2)

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