set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

Assertion (A) :
The weight of a body decreases with the increase of altitude on earth.
Reason (R) :
The earth is not a perfect sphere.

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

Question : 2

The specific gravity of a substance is measured by a hydrometer at the sea level. If the measurement is done at the top of a mountain, what would be the specific gravity ?

a) Less than that measured at the sea level

b) More than that measured at the sea level

c) Zero

d) Same as that measured at the sea level

Question : 3

The substance which exhibits practically no elastic effect is

a) Fe

b) quartz

c) rubber

d) Cu

Question : 4

The weight of a body is 9.8 N at the place where g = 9.8 ms–2. Its mass is

a) 10 kg

b) 9.8 kg

c) zero

d) 1 kg

Question : 5

Match the Column I and Column II.

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)

Question : 6

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