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 2

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Question 1 of 25

2.745 rounded off to three significant figures becomes:

2.75 2.74 2.73 2.76

Question 2 of 25

The dimensions of volume are:

[L²] [L³] [ML²] [ML³]

Question 3 of 25

The dimensions of velocity are:

[LT] [LT⁻¹] [L²T⁻¹] [MLT⁻¹]

Question 4 of 25

The dimensions of acceleration are:

[LT⁻¹] [LT⁻²] [MLT⁻²] [L²T⁻²]

Question 5 of 25

The dimensions of force are:

[MLT⁻²] [ML²T⁻²] [LT⁻²] [ML⁻¹T⁻²]

Question 6 of 25

The dimensions of density are:

[ML³] [M⁻¹L³] [ML⁻³] [M⁻³L]

Question 7 of 25

A dimensional formula expresses a quantity in terms of:

Units only Base quantities Symbols only Constants only

Question 8 of 25

Dimensional analysis is useful for:

Checking equations Unit conversion Deriving relations All of these

Question 9 of 25

According to the principle of homogeneity:

Different dimensions can be added Same dimensions can be added Units are ignored Constants are added

Question 10 of 25

Velocity and force:

Can be added Have same dimensions Cannot be added Are dimensionless

Question 11 of 25

Which quantity is dimensionless?

Density Velocity Refractive Index Force

Question 12 of 25

Angle is:

Dimensionless Length Area Time

Question 13 of 25

The argument of a trigonometric function must be:

Length Force Dimensionless Mass

Question 14 of 25

Which formula is dimensionally correct for kinetic energy?

mv²/2 m²v³ ma mv

Question 15 of 25

Dimensional consistency guarantees:

Correct equation always Wrong equation Only possible correctness Exact answer

Question 16 of 25

A dimensionally incorrect equation is:

Always correct Always wrong Sometimes correct Approximate

Question 17 of 25

The dimensions of momentum are:

[MLT⁻¹] [MLT⁻²] [ML²T⁻²] [LT⁻¹]

Question 18 of 25

The dimensions of energy are:

[MLT⁻²] [ML²T⁻²] [ML²T⁻¹] [LT⁻²]

Question 19 of 25

The dimensions of power are:

[ML²T⁻³] [ML²T⁻²] [MLT⁻²] [LT⁻¹]

Question 20 of 25

Which system used centimetre, gram and second?

MKS FPS CGS SI

Question 21 of 25

Which system used foot, pound and second?

CGS FPS MKS SI

Question 22 of 25

Which system used metre, kilogram and second?

FPS CGS MKS SI

Question 23 of 25

Avogadro number is:

6.022 × 10²³ 3 × 10⁸ 9.8 1.6 × 10⁻¹⁹

Question 24 of 25

One mole contains:

10²⁰ particles 10²² particles 6.022 × 10²³ particles 10²⁵ particles

Question 25 of 25

The International System of Units was developed by:

NASA BIPM ISRO UNESCO

Prepare for CBSE Class 11 Physics Chapter 1 – Units and Measurement with these 25 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

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

units-and-measurement-important-25-mcqs-class-11-physics

Practice 25 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.