A body is thrown vertically upwards with kinetic energy 100 J. At highest point, kinetic energy is MCQ with Answer and Explanation

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A body is thrown vertically upwards with kinetic energy 100 J. At highest point, kinetic energy is

A. 200 J

B. 100 J

C. 0 J

D. 50 J

Answer: Option C

Solution (By JKSSB Mock Tests)

At highest point velocity zero, so K.E. = 0. All converted to P.E.

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Question #1

Which of the following has the shortest wavelength?

A. Infrared

B. X-rays

C. Gamma rays

D. Ultraviolet

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Correct Answer: Option C

Explanation:
Gamma rays have wavelengths < 10⁻¹² m, shortest in EM spectrum. X-rays 10⁻¹⁰-10⁻⁸ m. UV 10⁻⁸-4×10⁻⁷ m. IR longer. So gamma rays shortest. Highest frequency, energy.

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Question #2

The device used to convert DC to AC is

A. Rectifier

B. Generator

C. Transformer

D. Inverter

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Correct Answer: Option D

Explanation:
Inverter converts DC to AC. Rectifier AC to DC.

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Question #3

The energy dissipated as heat in a resistor is given by

A. All of the above

B. VIt

C. I²Rt

D. V²t/R

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Correct Answer: Option A

Explanation:
All expressions equivalent (Joule's law).

This question belongs to: Science Physics

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