Skip to content
Login Register

#physics MCQ

14 public questions tagged with this topic.

PHYSICS

Which of the following equations is dimensionally inconsistent?

(a) [v] = [L T^{-1], [u + a t] = [L T^{-1] + [L T^{-2] [T] = [L T^{-1], consistent. (b) [s] = [L], [v t + a t] = [L] + [L T^{-1], inconsistent. (c) [F] = [M L T^{-2], [m v² / r] = [M L² T^{-2] / [L] = [M L T^{-2], consistent. (d) [E] = [M L² T^{-2], [F r] = [M L T^{-2] [L] = [M L² T^{-2], consistent.

Ref: NCERT Physics Textbook for Class XI and XII, Chapter: Units and Measurements and Physical World, Topic: Dimensional analysis and fundamental principles.

View Details
PHYSICS

In forward bias, the effective barrier height of a p-n junction is:

In forward bias, the applied voltage ( V ) opposes the built-in potential ( V_0 ), reducing the effective barrier height to V_0 - V, allowing more carriers to cross the junction.

Ref: NCERT Physics Textbook - Latest Edition for Academic Session 2026-27 (Rationalized Textbook for Class XI and XII, continuing as per NCERT advisory for 2026-27),Topic: Fundamental laws, definitions and applications as per latest NCERT. The section explains governing laws, formulas like μ₀ = 4π.

View Details
CHEMISTRY

Which component of an electromagnetic wave vibrates perpendicular to its direction of propagation?

Electromagnetic waves consist of electric and magnetic fields oscillating perpendicular to each other and to the wave’s direction. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Relevant Chemistry topic covering principles and examples as per NCERT.

View Details
Universal Law of Gravitation

Which of the following statements is correct about the gravitational force between two masses?

F = Gm1m2r2 is always attractive, as masses are positive and the force vector points toward each other, making option 1 correct. As per NCERT, applying relevant law/formula with correct units and sign convention leads to It is always attractive. This satisfies dimensional consistency and physical conditions given, so option A is scientifically correct.

Ref: Halliday & Resnick, Fundamentals of Physics, 11th ed., Chapter 13: Gravitation.

View Details