Dimensional Analysis MCQs for Class 11 Physics
Dimensional Analysis MCQs – Class 11 Physics
Class: CBSE Class 11
Subject: Physics
Section: Physical World & Measurement
Topic: Dimensional Analysis
CBSE Board Examinations • NCERT Based • Concept-Oriented MCQs
1. The dimensional formula of force is:
Answer: (C) MLT-2
Explanation: Force = mass × acceleration. Mass has dimension M and acceleration has dimensions LT-2. Thus, force = M × LT-2 = MLT-2.
Explanation: Force = mass × acceleration. Mass has dimension M and acceleration has dimensions LT-2. Thus, force = M × LT-2 = MLT-2.
2. The dimensional formula of pressure is:
Answer: (A) ML-1T-2
Explanation: Pressure = force/area. Force = MLT-2 and area = L2. So pressure = MLT-2/L2 = ML-1T-2.
Explanation: Pressure = force/area. Force = MLT-2 and area = L2. So pressure = MLT-2/L2 = ML-1T-2.
3. Which of the following quantities is dimensionless?
Answer: (B) Strain
Explanation: Strain is the ratio of change in length to original length. Since it is a ratio of similar quantities, it has no dimensions.
Explanation: Strain is the ratio of change in length to original length. Since it is a ratio of similar quantities, it has no dimensions.
4. The dimensional formula of energy is:
Answer: (A) ML2T-2
Explanation: Energy = work = force × displacement. Force = MLT-2 and displacement = L. So energy = ML2T-2.
Explanation: Energy = work = force × displacement. Force = MLT-2 and displacement = L. So energy = ML2T-2.
5. Which physical quantity has the same dimensions as torque?
Answer: (B) Work
Explanation: Torque = force × distance = MLT-2 × L = ML2T-2, which is the same as work or energy.
Explanation: Torque = force × distance = MLT-2 × L = ML2T-2, which is the same as work or energy.