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Frequency & Amplitude — Homi Bhabha Exam Physics MCQs with Solutions
Free Homi Bhabha Exam Physics Frequency & Amplitude MCQs with step-by-step solutions (6 questions). Part of Sound. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Frequency & Amplitude · medium · theory
The pitch (shrillness) of a sound depends on its:
A. amplitude
B. wavelength only
C. speed
D. frequency ✓ Correct
Solution: Higher frequency gives a higher pitch; loudness depends on amplitude.
Q2 — Frequency & Amplitude · medium · theory
The loudness of a sound depends on its:
A. frequency
B. amplitude ✓ Correct
C. pitch
D. speed
Solution: A larger amplitude means a louder sound; pitch depends on frequency.
Q3 — Frequency & Amplitude · medium · numerical
A tuning fork vibrates 480 times in 2 s. Its frequency is:
A. 120 Hz
B. 960 Hz
C. 480 Hz
D. 240 Hz ✓ Correct
Solution: Frequency $= \dfrac{\text{number of vibrations}}{\text{time}} = \dfrac{480}{2} = 240$ Hz.
Q4 — Frequency & Amplitude · hard · numerical
A sound wave has a speed of 340 m/s and a frequency of 170 Hz. Its wavelength is:
A. 0.5 m
B. 510 m
C. 2.5 m
D. 2 m ✓ Correct
Solution: Wavelength $= \dfrac{v}{f} = \dfrac{340}{170} = 2$ m.
Q5 — Frequency & Amplitude · hard · numerical
The time period of a wave of frequency 250 Hz is:
A. 250 s
B. 0.04 s
C. 0.004 s ✓ Correct
D. 0.25 s
Solution: Time period $= \dfrac{1}{f} = \dfrac{1}{250} = 0.004$ s.
Q6 — Frequency & Amplitude · hard · theory
Two sounds have the same loudness, but one is shriller than the other. The shriller sound has a greater:
A. frequency ✓ Correct
B. speed
C. time period
D. amplitude
Solution: Shrillness (pitch) is decided by frequency; equal loudness means equal amplitude.