Chapter Exam

Chapter 1: Waves — Online MCQ Test

Q: What is the speed of a transverse wave on a stretched string given by?

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).

Q: Which of the following is a longitudinal wave?

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.

Q: A wave of frequency 200 Hz travels with speed 300 m/s. Its wavelength is:

Answer: B. 1.5 m — Using v = fλ, we get λ = v/f = 300/200 = 1.5 m.

Q: 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:

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.

PHYSICS · CLASS 12 INTERMEDIATE 2 YEAR · Telangana State Board

Practice Chapter 1: Waves with a free chapter-wise online MCQ test for Telangana State Board CLASS 12 INTERMEDIATE 2 YEAR PHYSICS. 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.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 1: Waves — Important Questions & Answers (FAQ)

Frequently asked questions from Telangana State Board CLASS 12 INTERMEDIATE 2 YEAR PHYSICS — Chapter 1: Waves, with answers and explanations. These are sample questions; the exam has its own separate question set.

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).

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.

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.

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.

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.