Oscillation and Waves UPSC Questions

Physics

Oscillation and Waves MCQ Questions


7.
The simple harmonic motion is represented by x = A cos(ωt + φ), then 'ω' is
A.
Phase constant
B.
Displacement
C.
Angular frequency
D.
Amplitude
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ANSWER :
C. Angular frequency
8.
What is the length of a simple pendulum, which ticks seconds ?
A.
1 m
B.
2 m
C.
3 m
D.
4 m
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ANSWER :
A. 1 m
9.
If T is the time period of an oscillating pendulum, which one of the following statements is/are correct ? (i) The motion repeats after time T only once (ii) T is the least time after which motion repeats itself (iii) The motion repeats itself after nT, where n is a positive integer (iv) T remains the same only for small angular displacements
A.
(i), (ii) and (iii) only
B.
(ii), (iii) and (iv) only
C.
(i), (iii) and (iv) only
D.
All the above
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ANSWER :
B. (ii), (iii) and (iv) only
10.
In mechanical oscillation of a body oscillates about its mean position which is also its _____
A.
Force
B.
Motion
C.
Watt
D.
Equilibrium position
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ANSWER :
D. Equilibrium position
11.
A child swinging on a swing in sitting position, stands up. Then the time period of swing will
A.
Increase
B.
Decrease
C.
Remains Constant
D.
None of the above
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ANSWER :
B. Decrease
12.

Which of the following statement is/are correct about oscillations?
(i) Phase constant is dimensionless
(ii) The phenomenon of increase in amplitude when the driving force is close to the natural frequency of the oscillator is called resonance
(iii) When a system (such as a simple pendulum or a block attached to a spring) is displaced from its equilibrium position and released, it oscillates with its natural frequency w, and the oscillations are called free oscillations
(iv) All free oscillations eventually die out because of the ever present damping forces. However, an external agency can maintain these oscillations. These are called forced or driven oscillations

A.

(i) only

B.

(ii) and (iii) only

C.

(i), (ii) and (iii) only

D.

All the above

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ANSWER :

D. All the above