A man of mass 60 kg stands on a weighing machine in a lift accelerating upward at 2 m/s². Reading in kg wt (g=10) is MCQ with Answer and Explanation

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A man of mass 60 kg stands on a weighing machine in a lift accelerating upward at 2 m/s². Reading in kg wt (g=10) is

A. 60 kg

B. 80 kg

C. 48 kg

D. 72 kg

Answer: Option D

Solution (By JKSSB Mock Tests)

Apparent weight = m(g+a) = 60×12 = 720 N. In kg wt, 720/10 = 72 kg. So machine shows 72 kg. Downward acceleration would show less.

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A wave completes 20 oscillations in 4 seconds. Frequency is

A. 5 Hz

B. 80 Hz

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Correct Answer: Option A

Explanation:
f = 20/4 = 5 Hz.

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