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. 2R/π

B. R/3

C. R/π

D. R/2

Answer: Option A

Solution (By JKSSB Mock Tests)

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

This question belongs to: Science Physics

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An ammeter is always connected in

A. Across supply

B. Parallel with circuit

C. Series with circuit

D. Either series or parallel

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Correct Answer: Option C

Explanation:
Ammeter measures current, must be in series so full current flows through it. Low internal resistance to minimize voltage drop. Voltmeter measures potential difference, connected in parallel, high resistance.

This question belongs to: Science Physics

Question #2

Rainbow formation involves:

A. Diffraction

B. Refraction only

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D. Reflection only

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Correct Answer: Option C

Explanation:
Rainbow: sunlight enters raindrop (refraction + dispersion), reflects internally (TIR), exits with further refraction. Primary rainbow: one TIR; secondary: two TIRs. Memory tip: 'Rainbow = refraction + dispersion + TIR in water droplets'. Application question testing atmospheric optics, frequently appearing in competitive exams.

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Question #3

The wavelength of a wave is the distance between two consecutive

A. Crests

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C. Crest and trough

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Correct Answer: Option B

Explanation:
Wavelength is distance between successive crests or successive troughs.

This question belongs to: Science Physics

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