The dimensional formula of strain is MCQ with Answer and Explanation

Question Report Error

The dimensional formula of strain is

A. [T⁻¹]

B. [MLT⁻²]

C. [M⁰L⁰T⁰]

D. [L]

Answer: Option C

Solution (By JKExamLibrary)

Strain = ΔL/L, dimensionless, so [M⁰L⁰T⁰].

This question belongs to: Science Physics

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Practice More Physics Questions

Question #1 Report Error

The phenomenon of superconductivity is characterized by:

A. Infinite electrical resistance

B. Zero electrical resistance below critical temperature

C. High thermal conductivity

D. Zero magnetic permeability

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Correct Answer: Option B

Explanation:
Superconductivity occurs in certain materials below a critical temperature T_c, where electrical resistance drops abruptly to zero, and magnetic fields are expelled (Meissner effect). Option B describes insulators; C and D are unrelated. Memory aid: 'Superconductor: R=0 below T_c; perfect diamagnetism'. This modern physics concept is frequently tested in competitive exams. Always distinguish superconductivity (zero resistance) from perfect conductivity (theoretical limit); real superconductors exhibit Meissner effect, a defining property.

This question belongs to: Science Physics

Question #2 Report Error

Electric motor works on principle of:

A. Electrostatic attraction

B. Electromagnetic induction

C. Force on current in magnetic field

D. Thermal expansion

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Correct Answer: Option C

Explanation:
Motor: current-carrying conductor in magnetic field experiences Lorentz force (F = ILB), causing rotation. Generator uses reverse principle (induction). Memory tip: 'Motor: electricity ⇒ motion (force); Generator: motion ⇒ electricity (induction)'. Device principle question frequently tested in competitive electromagnetism sections.

This question belongs to: Science Physics