MCQ SET 01 Physics Class 11

Section – A: Multiple Choice Questions

Question 1:

Which of the following is the correct representation of a 10 cm long scale?

(A) The scale of the length is 10 cm.
(B) This is a 10 cm long scale.
(C) This is a 10 cm long scale.
(D) The scale of the length is 10 c.m.

Answer: (A) The scale of the length is 10 cm.

Explanation: Units should be symbolically represented without dots unless they appear at the end of a sentence as a full stop.

Question 2:

The displacement (in meters) of a body varies with time t (in seconds) as x = t² - 2t - 3. The displacement is zero for a positive value of t equal to:

(A) 1 s
(B) 4 s
(C) 3 s
(D) 2 s

Answer: (C) 3 s

Explanation: Given x = t² - 2t - 3. For x = 0, 0 = (t + 1)(t - 3) so t = 3, -1.

Question 3:

If A = B + C and the magnitudes of A, B, and C are 5, 4, and 3, respectively, then the angle between A and C is:

(A) sin^-1 (3/5)
(B) cos^-1 (3/5)
(C) cos^-1 (4/5)
(D) sin^-1 (4/5)

Answer: (B) cos^-1 (3/5)

Question 4:

Application of lubricants cannot reduce:

(A) Static friction
(B) Sliding friction
(C) Rolling friction
(D) Inertia

Answer: (D) Inertia

Question 5:

A force of 49 N is just able to move a block of mass 10 kg on a rough horizontal surface. The coefficient of friction is:

(A) 0.5
(B) 1.0
(C) 0
(D) 0.8

Answer: (A) 0.5

Question 6:

When a body is dropped from a tower, then there is an increase in its:

(A) Weight
(B) Acceleration
(C) Velocity
(D) Gravitational potential energy

Answer: (C) Velocity

Question 7:

A cyclist comes to a skidding stop in 20 m. During this process, the force on the cycle due to the road is 100 N and is directly opposed to the motion. Work done by the road on the cycle is:

(A) -2000 J
(B) 2000 J
(C) 1000 J
(D) 100 J

Answer: (A) -2000 J

Question 8:

On which of the following factors does the moment of inertia of an object not depend?

(A) Axis of rotation
(B) Angular velocity
(C) Distribution of mass
(D) Mass of an object

Answer: (B) Angular velocity

Question 9:

Escape velocity of an object of mass m is proportional to:

(A) m²
(B) m
(C) m^-1
(D) m⁰

Answer: (D) m⁰

Question 10:

Rigidity modulus and Young’s modulus are respectively η and Y. A copper wire of length L and area of cross-section A is pulled so that its length becomes 5L and area of cross-section becomes A/5. So:

(A) Y increases, η decreases.
(B) η increases, Y decreases.
(C) Both Y and η increase.
(D) Both Y and η remain unchanged.

Answer: (D) Both Y and η remain unchanged.