MCQ On Class 11 Physics Chapter 14 Oscillations

1 The period of thin magnet is 4 sec. if it is divided into two equal halves then the time period of each part will be

A 4 sec

B 1 sec

C 2 sec

D 8 sec

Answer:2 sec

2 The bob of a simple pendulum is a spherical hollow ball filled with water. A plugged hall near the bottom of the oscillating bob gets suddenly unplugged. During observation, till water is coming out, the time -period of the oscillation would

A first decrease and then increase to the original value

B first increase and then decrease to the original value

C increase towards a saturation value

D remain unchanged

View Answer

Answer:first increase and then decrease to the original value

3 In damped oscilation, the angular frequency of the oscillator

A keeps on decreasing

B keeps on increasing

C emains the same

D fluctuates

View Answer

Answer:emains the same

4 When a particle performing uniform circular motion of radius 10 cm undergoes the SHM, what will be its amplitude?

A 10 cm

B 5 cm

C 2.5 cm

D 20 cm

View Answer

Answer:10 cm

5 In damped oscilation the directions of the restoring force and the resistive force

A are the same

B are opposite

C may be same or opposite

D have no relation with each other

View Answer

Answer:may be same or opposite

6 One of the two clocks on the earth is controlled by a pendulum and other by a spring. If both the clocks are taken to the moon, then which clock will have the same time – period of the earth?

A spring clock

B pendulum clock

C both

D none

View Answer

Answer:spring clock

7 The displacement y of a particle executing periodic motion is given by y = 4 cos² (t/2) sin (1000t). This expression may be considered to be a result of superposition of the following number of harmonic motions.

A two

B three

C four

D five

View Answer

Answer:three

8 In the case of forced oscillations, which of the following statements is not true?

A frequency equals that of external periodic force

B amplitude depends upon the damping coefficient

C amplitude tends to infinity at resonance

D higher the damping coefficient, lower is the amplitude at resonance

View Answer

Answer:amplitude tends to infinity at resonance

9 Spring is pulled down by 2 cm. What is amplitude of motion?

A 0 cm

B 6 cm

C 2 cm

D cm

View Answer

Answer:2 cm

10 Time period of simple pendulum of length l and a place where acceleration due to gravity is g is T. what is the period of a simple pendulum of the same length at a place where the acceleration due to gravity is 1.029 is,

A T

B 1.02 T

C 0.99 T

D 1.01 T

View Answer

Answer:0.99 T

11 The acceleration of particle executing S.H.M. when it is at mean position is

A Infinite

B Varies

C Maximum

D Zero

View Answer

Answer:Zero

12 Length of a simple pendulum executing simple harmonic motion is increased by 21%. The percentage increase in the time – period of the pendulum of increased length is

A 10%

B 1%

C 21%

D 42%

View Answer

Answer:10%

13 The maximum velocity for particle in SHM is 0.16 m/s and maximum acceleration is 0.64 m/s2. The amplitude is

A 4 × 10^-2 m

B 4 × 10^-1 m

C 4 × 10 m

D 4 × 100 m

View Answer

Answer:4 × 10^-2 m

14 If a simple harmonic oscillator has got a displacement of 0.02 m and acceleration equal to 2.0 ms^-2 at any time, the angular frequency of the oscillator is equal to

A 10 rad s^-1

B 1 rad s^-1

C 100 rad s^-1

D 1 rad s^-1

View Answer

Answer:10 rad s^-1

15 If a hole is bored along the diameter of the earth and a stone is dropped into the hole

A The stone reaches the centre of the earth and stops there

B The stone reaches the other side of the earth and stops there

C The stone executes simple harmonic motion about the centre of the earth

D The stone reaches the other side of the earth and escapes into space

View Answer

Answer:The stone executes simple harmonic motion about the centre of the earth

16 The period of a simple harmonic oscillator is 2 sec. The ratio of its maximum velocity and maximum acceleration is

A ∏

B 1/∏

C 2∏

D 4

View Answer

Answer:1/∏

17 If the length of seconds pendulum is increased by 2%, how may seconds it will lose per day?

A 3427 sec

B 3727 sec

C 3927 sec

D 864 sec

View Answer

Answer:864 sec

18 In SHM, graph of which of the following is a straight line?

A T.E. against displacement

B P.E. against displacement

C Acceleration against time

D Velocity against displacement

View Answer

Answer:T.E. against displacement

19 The motion of a particle executing simple harmonic motion is given by X = 0.01 sin 100p (t + 0.05), where X is in metres ant t in second. The time period in second is

A 0.001

B 0.02

C 0.1

D 0.2

View Answer

Answer:0.02

20 For a magnet of time period T magnetic moment is M, if the magnetic moment becomes one fourth of the initial value, then the time period of oscillation becomes.

A Half of initial value

B One fourth of initial value

C Double of initial value

D Four time initial value

View Answer