Chapter 1: Waves — Online MCQ Test
PHYSICS · CLASS 12 INTERMEDIATE 2 YEAR · Telangana State Board
Practice Chapter 1: Waves with a free chapter-wise online MCQ test.
This chapter covers: This chapter covers wave motion speed of transverse and longitudinal waves principle of superposition Doppler effect in sound wave interference and standing waves in pipes and stre....
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Chapter 1: Waves — Important Questions & Answers
What is the speed of a transverse wave on a stretched string given by?
- A. v = T/μ
- B. v = √(T/μ)
- C. v = √(μ/T)
- D. v = Tμ
Answer: B. v = √(T/μ)
The wave speed on a stretched string depends on the tension T and mass per unit length μ as v = √(T/μ).
The wave speed on a stretched string depends on the tension T and mass per unit length μ as v = √(T/μ).
Which of the following is a longitudinal wave?
- A. Light wave
- B. Water surface wave
- C. Sound wave in air
- D. Wave on a stretched string
Answer: C. Sound wave in air
In sound waves, the particles of the medium vibrate parallel to the direction of wave propagation, so it is longitudinal.
In sound waves, the particles of the medium vibrate parallel to the direction of wave propagation, so it is longitudinal.
A wave of frequency 200 Hz travels with speed 300 m/s. Its wavelength is:
- A. 0.67 m
- B. 1.5 m
- C. 2 m
- D. 60000 m
Answer: B. 1.5 m
Using v = fλ, we get λ = v/f = 300/200 = 1.5 m.
Using v = fλ, we get λ = v/f = 300/200 = 1.5 m.
A sound source moving away from a stationary observer produces a frequency of 480 Hz. If the original frequency is 500 Hz, the observed change is due to:
- A. increase in velocity of sound
- B. increase in amplitude only
- C. Doppler effect causing decrease in apparent frequency
- D. reflection of sound from the source
Answer: C. Doppler effect causing decrease in apparent frequency
When the source moves away, the wavefronts get stretched and the observed frequency decreases, which is the Doppler effect.
When the source moves away, the wavefronts get stretched and the observed frequency decreases, which is the Doppler effect.
A source of sound of frequency f moves with speed v_s toward a stationary observer. If the speed of sound is v, the apparent frequency is:
- A. f(v - v_s)/v
- B. f(v + v_s)/v
- C. f v/(v - v_s)
- D. f v/(v + v_s)
Answer: C. f v/(v - v_s)
For a moving source approaching a stationary observer, the Doppler formula is f' = f v/(v - v_s). The observed frequency increases.
For a moving source approaching a stationary observer, the Doppler formula is f' = f v/(v - v_s). The observed frequency increases.