The centre of mass of a uniform semicircular ring of radius R lies at distance from centre MCQ with Answer and Explanation

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The centre of mass of a uniform semicircular ring of radius R lies at distance from centre

A. R/π

B. R/2

C. 2R/π

D. R/3

Answer: Option C

Solution (By JKExamLibrary)

For semicircular ring, y_cm = 2R/π from centre.

This question belongs to: Science Physics

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The material of a permanent magnet should have

A. High retentivity, high coercivity

B. High retentivity, low coercivity

C. Low retentivity, high coercivity

D. Low retentivity, low coercivity

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Correct Answer: Option A

Explanation:
Permanent magnets need high retentivity and high coercivity to stay magnetized. Steel, alnico.

This question belongs to: Science Physics

Question #2 Report Error

A radioactive nucleus emits a beta particle. Its mass number

A. Remains unchanged

B. Decreases by 1

C. Increases by 1

D. Decreases by 2

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Correct Answer: Option A

Explanation:
β⁻ decay: n → p + e⁻, so A unchanged, Z increases by 1.

This question belongs to: Science Physics

Question #3 Report Error

The characteristic of sound that distinguishes between two sounds of same pitch and loudness is

A. Wavelength

B. Frequency

C. Quality

D. Intensity

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Correct Answer: Option C

Explanation:
Timbre or quality depends on waveform/harmonics. Different instruments same note sound different.

This question belongs to: Science Physics

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