Angular momentum dimensions: MCQ with Answer and Explanation

Angular momentum dimensions:
A. [ML²T⁻¹]
B. [M⁰L⁰T⁰]
C. [MLT⁻¹]
D. [ML²T⁻²]
Answer: Option A
Solution (By JKSSB Mock Tests)
L = r × p: [L][MLT⁻¹] = [ML²T⁻¹]. Same as Planck's constant. Memory tip: 'Angular momentum: [ML²T⁻¹]; action quantities share dimensions'. Dimensional analysis frequently tested in competitive exams.

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Practice More Physics Questions

Question #1
The phenomenon of electromagnetic induction is the basis for the working of:
A. Transformer
B. Generator
C. Both (b) and (c)
D. Electric motor

Correct Answer: Option C


Explanation:
Electromagnetic induction (changing magnetic flux induces EMF) is the principle behind generators (mechanical energy to electrical) and transformers (AC voltage conversion). Electric motors work on the reverse principle: force on current-carrying conductor in magnetic field. Memory aid: 'Induction applications: generators, transformers, induction cooktops; motors use motor effect'. This application question tests electromagnetism fundamentals, frequently examined in competitive exams. Always distinguish induction (generator/transformer) from motor effect (motor); competitive exams often combine both in device-based questions.

This question belongs to: Science Physics
Question #2
The speed of light in vacuum is
A. 3 × 10⁴ m/s
B. 3 × 10¹⁰ m/s
C. 3 × 10⁸ m/s
D. 3 × 10⁶ m/s

Correct Answer: Option C


Explanation:
c = 2.9979 × 10⁸ m/s, commonly 3×10⁸ m/s. In glass slower. It's a universal constant, maximum speed. Used in relativity, E=mc².

This question belongs to: Science Physics
Question #3
The dimensional formula for work is
A. [MLT⁻²]
B. [ML²T⁻²]
C. [MLT⁻¹]
D. [ML²T⁻¹]

Correct Answer: Option B


Explanation:
Work = Force × displacement = [MLT⁻²][L] = [ML²T⁻²].

This question belongs to: Science Physics