Units and Measurement Class 11 Physics Chapter 1 Important 25 MCQs with Answers and Explanations

Units and Measurement Class 11 Physics Chapter 1 Important 25 MCQs with Answers and Explanations | NCERT & CBSE Set 1

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Question 1 of 25

What is measurement?

Calculation of quantity Comparison with a standard unit Estimation of value Observation only

Question 2 of 25

The internationally accepted system of units is called:

CGS FPS MKS SI

Question 3 of 25

SI stands for:

Standard International Scientific Institute Système International d’Unités System of Indicators

Question 4 of 25

Which is the SI base unit of length?

Centimetre Metre Kilometre Millimetre

Question 5 of 25

Which is the SI base unit of mass?

Gram Milligram Kilogram Quintal

Question 6 of 25

Which is the SI unit of time?

Minute Hour Second Day

Question 7 of 25

How many SI base quantities are there?

5 6 7 8

Question 8 of 25

Which of the following is a base quantity?

Force Energy Velocity Length

Question 9 of 25

Which SI base unit is used for electric current?

Volt Ampere Coulomb Ohm

Question 10 of 25

The SI unit of thermodynamic temperature is:

Celsius Fahrenheit Kelvin Joule

Question 11 of 25

The SI unit of amount of substance is:

Gram Mole Atom Litre

Question 12 of 25

The SI unit of luminous intensity is:

Lux Lumen Candela Watt

Question 13 of 25

The unit of plane angle is:

Steradian Degree Radian Metre

Question 14 of 25

The unit of solid angle is:

Degree Radian Steradian Lumen

Question 15 of 25

Significant figures indicate:

Size of quantity Precision of measurement Unit conversion Error only

Question 16 of 25

How many significant figures are there in 287.5?

2 3 4 5

Question 17 of 25

All non-zero digits are:

Insignificant Significant Approximate Rounded

Question 18 of 25

Zeros between two non-zero digits are:

Not significant Significant Approximate Ignored

Question 19 of 25

Number of significant figures in 0.02308 is:

3 4 5 2

Question 20 of 25

Number of significant figures in 3.500 is:

2 3 4 5

Question 21 of 25

Trailing zeros in a decimal number are:

Not significant Significant Ignored Variable

Question 22 of 25

Scientific notation is expressed as:

a + b a × 10ᵇ a/b ab

Question 23 of 25

The order of magnitude of Earth’s diameter (1.28 × 10⁷ m) is:

10⁶ 10⁷ 10⁸ 10⁹

Question 24 of 25

In multiplication, the final result should have:

Maximum significant figures Minimum significant figures of given data Average significant figures No restriction

Question 25 of 25

In addition or subtraction, the result should retain:

Least decimal places Most decimal places Most significant figures No decimal places

Post Description (Short Intro)

Prepare for CBSE Class 11 Physics Chapter 1 – Units and Measurement with these 50 important multiple-choice questions (MCQs). Each question includes the correct answer and detailed explanation to help students strengthen concepts related to SI Units, Significant Figures, Dimensional Analysis, Scientific Notation, and Measurement. Useful for CBSE Board Exams, School Tests, Olympiads, NEET, JEE, SSC, and other competitive exams.

Units and Measurement MCQs

50 Important MCQs on Units and Measurement with Answers | Class 11 Physics Chapter 1

units-and-measurement-important-50-mcqs-class-11-physics

Practice 50 important MCQs from Class 11 Physics Chapter 1 Units and Measurement. Includes SI Units, Significant Figures, Dimensions, Dimensional Analysis, Scientific Notation, and detailed explanations for CBSE, NEET, JEE, SSC, and competitive exams.

FAQ
Q1. What is the SI unit of length?

The SI unit of length is the metre (m).

Q2. How many SI base quantities are there?

There are 7 SI base quantities: Length, Mass, Time, Electric Current, Temperature, Amount of Substance, and Luminous Intensity.

Q3. What are significant figures?

Significant figures are the meaningful digits in a measured quantity that indicate its precision.

Q4. What is dimensional analysis?

Dimensional analysis is a method used to check equations, derive relations, and convert units using dimensions of physical quantities.

Q5. Which quantity is dimensionless?

Refractive Index and Angle are examples of dimensionless quantities.

Q6. Why is Units and Measurement important?

It forms the foundation of Physics and is frequently asked in CBSE Board Exams, NEET, JEE Main, SSC, Railway, and other competitive examinations.

Q7. What is Avogadro’s Number?

Avogadro’s Number is 6.022 × 10²³, representing the number of particles in one mole of a substance.

Q8. What is the SI unit of temperature?

The SI unit of thermodynamic temperature is Kelvin (K).

Q9. What is the principle of homogeneity?

According to this principle, only quantities having the same dimensions can be added or subtracted.

Q10. Are these MCQs useful for competitive exams?

Yes, these MCQs are highly useful for CBSE, NEET, JEE, CUET, SSC CGL, CHSL, Railway, NDA, and other competitive exams.