Which of the following is NOT a unit of pressure? MCQ with Answer and Explanation

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Which of the following is NOT a unit of pressure?

A. Torr

B. Watt

C. Bar

D. Pascal

Answer: Option B

Solution (By JKExamLibrary)

Watt is power. Others are pressure units.

This question belongs to: Science Physics

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Question #1

The heating effect of electric current is utilised in

A. Electric generator

B. Electric motor

C. Electric fuse

D. Galvanometer

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Correct Answer: Option C

Explanation:
Fuse uses heating effect (Joule heating I²R). When current exceeds limit, fuse wire melts due to heat, breaking circuit. Motor uses magnetic effect, generator uses electromagnetic induction, galvanometer detects current. Iron box, heater also use heating effect.

This question belongs to: Science Physics

Question #2

Beats frequency = |f₁ - f₂|. For 256 Hz and 260 Hz, beats per second:

A. 4

B. 2

C. 258

D. 516

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Correct Answer: Option A

Explanation:
Beat frequency = |260 - 256| = 4 Hz ⇒ 4 beats/second. Interference of close frequencies causes amplitude modulation. Memory aid: 'Beats = frequency difference; used in tuning instruments'. Wave interference calculation frequently tested in competitive exams.

This question belongs to: Science Physics

Question #3

A body weighs 100 N on Earth's surface. Weight at a height equal to Earth's radius is

A. 0 N

B. 25 N

C. 100 N

D. 50 N

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Correct Answer: Option B

Explanation:
g' = g (R/(R+h))² = g (1/2)² = g/4. Weight = 100/4 = 25 N.

This question belongs to: Science Physics

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