A pulley system has 4 pulleys. Its velocity ratio (number of supporting ropes) is MCQ with Answer and Explanation

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

A. 8

B. 1

C. 2

D. 4

Answer: Option D

Solution (By JKSSB Mock Tests)

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

This question belongs to: Science Physics

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Question #1

The electromagnetic waves used in radar are

A. Infrared

B. Ultraviolet

C. Microwaves

D. Radio waves

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Correct Answer: Option C

Explanation:
RADAR uses microwaves (short wavelength radio waves). Often classified as microwaves.

This question belongs to: Science Physics

Question #2

Instrument measuring humidity:

A. Anemometer

B. Hygrometer

C. Barometer

D. Hydrometer

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Correct Answer: Option B

Explanation:
Hygrometer measures atmospheric humidity (water vapor content). Barometer: pressure; Hydrometer: liquid density; Anemometer: wind speed. Memory tip: 'Hygro = moisture; meter = measure'. Instrument identification frequently tested in competitive exams to verify practical physics knowledge.

This question belongs to: Science Physics

Question #3

A body covers 12 m in the 2nd second and 20 m in the 4th second of its motion. Assuming uniform acceleration, what is its initial velocity?

A. 6 m/s

B. 2 m/s

C. 8 m/s

D. 4 m/s

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Correct Answer: Option A

Explanation:
The distance covered in the nth second is Sn = u + a/2 * (2n - 1). For n=2: 12 = u + a/2 * (3) => 2u + 3a = 24. For n=4: 20 = u + a/2 * (7) => 2u + 7a = 40. Subtracting equations: 4a = 16 => a = 4 m/s^2. Substitute 'a' back: 2u + 3(4) = 24 => 2u = 12 => u = 6 m/s.

This question belongs to: Science Physics

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