In a longitudinal wave, the distance between two consecutive compressions is called MCQ with Answer and Explanation

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In a longitudinal wave, the distance between two consecutive compressions is called

A. Frequency

B. Rarefaction

C. Wavelength

D. Amplitude

Answer: Option C

Solution (By JKSSB Mock Tests)

Wavelength is distance between successive compressions or rarefactions.

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Satellite orbital velocity v = √(GM/r). If radius doubles, velocity becomes:

A. Same

B. √2 times

C. Half

D. 1/√2 times

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Correct Answer: Option D

Explanation:
v ∝ 1/√r. If r' = 2r, v' = v/√2. Orbital velocity decreases with increasing radius. Memory aid: 'Higher orbit ⇒ slower speed; v ∝ r⁻¹/²'. Proportional reasoning question testing gravitation formula application, frequently appearing in competitive exams without heavy calculation.

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Question #2

A body of mass 2 kg is raised to height 10 m and dropped. Potential energy just before dropping is (g=10)

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Correct Answer: Option D

Explanation:
PE = mgh = 2×10×10 = 200 J.

This question belongs to: Science Physics

Question #3

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

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Correct Answer: Option A

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

This question belongs to: Science Physics

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