The power of a lens is measured in MCQ with Answer and Explanation

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The power of a lens is measured in

A. Lux

B. Watt

C. Metre

D. Dioptre

Answer: Option D

Solution (By JKSSB Mock Tests)

Dioptre (D) = m⁻¹. Power = 1/f in metres. Convex positive, concave negative. Optometry uses dioptre.

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Question #1

A pulley system has 4 pulleys. Its velocity ratio (number of supporting ropes) is

A. 8

B. 2

C. 1

D. 4

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Correct Answer: Option D

Explanation:
For ideal block and tackle with n movable pulleys, VR = n = 4.

This question belongs to: Science Physics

Question #2

Which of the following is an isotope of hydrogen?

A. Tritium

B. Protium only

C. All of these

D. Deuterium

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Correct Answer: Option C

Explanation:
Protium (¹H), Deuterium (²H), Tritium (³H) are all isotopes of hydrogen, differing in neutron number.

This question belongs to: Science Physics

Question #3

For an organ pipe completely closed at one end, the fundamental frequency is f. What are the frequencies of the next two higher harmonics?

A. 4f and 6f

B. 3f and 5f

C. 2f and 3f

D. 2f and 4f

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Correct Answer: Option B

Explanation:
An organ pipe closed at one end features a node at the closed end and an antinode at the open end. Because of these boundary conditions, it can only support odd harmonics. If the fundamental frequency (1st harmonic) is f, the next permissible frequencies are the 3rd harmonic (3f), 5th harmonic (5f), 7th harmonic (7f), and so forth.

This question belongs to: Science Physics

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