BPSC CCE Prelims
Sound and Waves Previous Year Questions (PYQs)
Practice solved questions for Sound and Waves with detailed step-by-step solutions, key insights, and trend analysis for BPSC CCE PRELIMS.
Solved Previous Year Questions
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In which medium, the speed of sound is maximum?
Detailed Explanation:
Speed of sound depends on elasticity and density of the medium — highest in solids, moderate in liquids, lowest in gases.
Steel (solid) ≈ 5000–6000 m/s, Water (liquid) ≈ 1500 m/s, Air (gas) ≈ 343 m/s, Hydrogen (gas) ≈ 1284 m/s. Among given options, steel has maximum speed.
One of the properties associated with X-rays is that they can be deflected by
Detailed Explanation:
X-rays are electromagnetic waves with no electric charge, so they travel unaffected by electric or magnetic fields.
Only charged particles (like electrons, protons, alpha particles) experience deflection in electric or magnetic fields; neutral electromagnetic radiation (X-rays, gamma rays, light) passes straight through.
Shrillness of sound is determined by
Detailed Explanation:
Shrillness (or pitch) of sound is determined by the frequency of the sound wave.
Since frequency is inversely proportional to wavelength (f = v/λ, where v is constant in a given medium), wavelength determines pitch—shorter wavelength means higher frequency and shriller sound.
Amplitude determines loudness, not shrillness, while velocity depends on the medium and does not determine pitch.
Therefore, Option 3 (wavelength) is correct as it is directly related to frequency/pitch.
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Before playing the orchestra in a musical concert, a sitarist tries to adjust the tension and pluck the string suitably. By doing so, he/she is adjusting
Detailed Explanation:
✅ Statement 1 – Correct: Tuning a sitar before an orchestra involves adjusting the tension of the strings to match the frequency (pitch) with other instruments, ensuring all instruments play in harmony at the same musical scale.
❌ Statement 2 – Incorrect: Amplitude determines the loudness of sound, not the tuning; adjusting tension changes frequency/pitch, not amplitude.
❌ Statement 3 – Incorrect: Intensity (energy per unit area) is related to amplitude and distance, not directly adjusted through string tuning; tuning modifies frequency only.
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