Units and Measurements MCQs with Answers
Units and Measurements MCQs – Class 11 Physics
Class: CBSE Class 11
Subject: Physics
Section: Physical World & Measurement
Topic: Units and Measurements
CBSE Board Examinations • NCERT Based • Concept-Oriented MCQs
1. The SI unit of length is:
Answer: (C) Meter
Explanation: The SI system defines the meter as the standard unit of length, accepted internationally.
Explanation: The SI system defines the meter as the standard unit of length, accepted internationally.
2. Which of the following is a fundamental unit?
Answer: (C) Ampere
Explanation: Ampere is one of the seven fundamental SI units, used to measure electric current.
Explanation: Ampere is one of the seven fundamental SI units, used to measure electric current.
3. The number of significant figures in 0.00450 is:
Answer: (B) 3
Explanation: Leading zeros are not significant. The digits 4, 5, and the trailing zero after decimal are significant.
Explanation: Leading zeros are not significant. The digits 4, 5, and the trailing zero after decimal are significant.
4. Which instrument is most suitable for measuring the diameter of a thin wire?
Answer: (C) Screw gauge
Explanation: A screw gauge provides very high precision and is ideal for measuring very small dimensions.
Explanation: A screw gauge provides very high precision and is ideal for measuring very small dimensions.
5. Which of the following quantities has no unit?
Answer: (C) Relative density
Explanation: Relative density is the ratio of two densities, making it a dimensionless quantity.
Explanation: Relative density is the ratio of two densities, making it a dimensionless quantity.
