Last Updated on June 5, 2025 by XAM CONTENT
Mastering the important concepts in Class 11 Physics Chapter 1 – Units and Measurements is essential for scoring high marks in your exams. That’s why we’ve put together chapterwise multiple-choice questions (MCQs) with answers to help you revise effectively and boost your confidence. It is a part of MCQ Questions for CBSE Class 11 Physics Series.
These multiple-choice questions will help you assess your knowledge, improve accuracy, and boost confidence for your exams. Whether you are preparing for school tests, online tests or competitive exams, these Units and Measurements MCQs will strengthen your conceptual clarity.
| Chapter | Units and Measurements |
| Book | Physics for Class 11 |
| Type of Questions | MCQ Questions |
| Nature of Questions | Competency Based Questions |
| Board | CBSE |
| Class | 11 |
| Subject | Physics |
| Useful for | Class 11 Studying Students |
| Answers provided | Yes |
| Difficulty level | Mentioned |
| Important Link | Class 11 Physics Chapterwise MCQ Questions |
MCQ Questions on Units and Measurements Class 11 Physics (PDF Download)
MCQs
Q1. Which of the following quantities is dimensionless?
(a) Strain
(b) Force
(c) Pressure
(d) Velocity
Show Answer
Answer: (a)
Explanation: Strain is a ratio of two lengths and has no dimensions.
Q2. Dimensional formula of Planck’s constant is:
(a) [ML²T⁻¹]
(b) [ML²T⁻²]
(c) [MLT⁻²]
(d) [ML⁻¹T]
Show Answer
Answer: (a)
Explanation: h = E/ν = [ML²T⁻²]/[T⁻¹] = [ML²T⁻¹].
Q3. A quantity has dimensions [M⁰L⁰T⁰]. It must be:
(a) A physical constant
(b) A derived quantity
(c) A dimensionless quantity
(d) A fundamental quantity
Show Answer
Answer: (c)
Explanation: Any quantity with zero dimensions is dimensionless.
Q4. If the percentage error in length is 2%, then the error in the area will be:
(a) 2%
(b) 4%
(c) 6%
(d) 1%
Show Answer
Answer: (b)
Explanation: Area ∝ length², so error = 2 × 2% = 4%.
Q5. Which of the following is dimensionally consistent with energy?
(a) Force × Acceleration
(b) Pressure × Volume
(c) Mass × Velocity
(d) Work × Time
Show Answer
Answer: (b)
Explanation: Pressure × Volume = [ML⁻¹T⁻²] × [L³] = [ML²T⁻²].
Q6. Which of the following has different dimensions than the others?
(a) Work
(b) Torque
(c) Energy
(d) Power
Show Answer
Answer: (d)
Explanation: Power has dimensions [ML²T⁻³] while others have [ML²T⁻²].
Q7. The SI unit of impulse is equivalent to:
(a) kg m/s
(b) N s
(c) Both (a) and (b)
(d) J s
Show Answer
Answer: (c)
Explanation: Impulse = Force × Time = N·s = kg·m/s.
Q8. Which of these is not a correct dimensional formula?
(a) Energy: [ML²T⁻²]
(b) Pressure: [ML⁻¹T⁻²]
(c) Power: [ML²T⁻³]
(d) Density: [M⁻¹L³T⁻²]
Show Answer
Answer: (d)
Explanation: Correct formula for density is [ML⁻³].
Q9. Which of the following is the most precise instrument?
(a) Ruler
(b) Vernier Caliper
(c) Screw Gauge
(d) Optical Interferometer
Show Answer
Answer: (d)
Explanation: Optical methods can measure with wavelength precision.
Q10. Which quantity is dimensionally different from the others?
(a) Angular velocity
(b) Frequency
(c) Acceleration
(d) Reciprocal of time
Show Answer
Answer: (c)
Explanation: Acceleration: [LT⁻²]; others: [T⁻¹].
Q11. Dimensional formula of surface tension is:
(a) [MT⁻²]
(b) [ML⁰T⁻²]
(c) [ML⁻²T⁻²]
(d) [ML⁻¹T⁻²]
Show Answer
Answer: (d)
Explanation: Surface tension = Force/length = [MLT⁻²]/[L] = [ML⁻¹T⁻²].
Q12. Which of these is not a fundamental quantity in SI system?
(a) Time
(b) Temperature
(c) Length
(d) Area
Show Answer
Answer: (d)
Explanation: Area is a derived quantity; others are fundamental.
Q13. Which of these does not have the dimensional formula [ML²T⁻²]?
(a) Work
(b) Energy
(c) Torque
(d) Power
Show Answer
Answer: (d)
Explanation: Power = Work/Time = [ML²T⁻³].
Q14. The dimensional formula of angular momentum is:
(a) [ML²T⁻¹]
(b) [MLT⁻²]
(c) [ML²T⁻²]
(d) [MLT⁻¹]
Show Answer
Answer: (a)
Explanation: Angular momentum = mvr = [M][LT⁻¹][L] = [ML²T⁻¹].
Q15. If force is proportional to velocity squared, what are the dimensions of the constant of proportionality?
(a) [MLT⁻³]
(b) [ML⁻¹]
(c) [M]
(d) [MLT]
Show Answer
Answer: (b)
Explanation: F = kv² → k = F/v² = [MLT⁻²]/[L²T⁻²] = [ML⁻¹].
Q16. Which one of the following equations is not dimensionally consistent?
(a) s = ut + ½at²
(b) v² = u² + 2as
(c) p = mv
(d) E = pt
Show Answer
Answer: (d)
Explanation: Energy = Power × Time → dimensions [ML²T⁻²] = [ML²T⁻³] × [T] = [ML²T⁻²]; so it is correct. But if p means pressure, E = pt is wrong.
Q17. Dimensional analysis fails to:
(a) Check the correctness of equations
(b) Derive equations with dimensionless constants
(c) Find units of a quantity
(d) Compare two different quantities
Show Answer
Answer: (b)
Explanation: Dimensional analysis cannot find numerical constants like 1/2, π, etc.
Q18. If density ρ has dimensions [ML⁻³], and acceleration a has [LT⁻²], then pressure P given by Pa/ρ must have:
(a) [L²T⁻²]
(b) [L]
(c) [L⁻²]
(d) [LT⁻²]
Show Answer
Answer: (a)
Explanation: P = (Pa)/ρ → [ML⁻¹T⁻²][L T⁻²]/[ML⁻³] = [L²T⁻²].
Q19. A quantity has dimensions [M⁰L⁰T⁰]. Which of these is a possible example?
(a) Angle
(b) Frequency
(c) Velocity
(d) Momentum
Show Answer
Answer: (a)
Explanation: Angle = arc/radius = length/length = dimensionless.
Q20. Which quantity can be used to derive dimensions of gravitational constant G?
(a) Force
(b) Mass
(c) Acceleration
(d) All of these
Show Answer
Answer: (d)
Explanation: G is derived from F = Gm₁m₂/r², so it depends on force, mass, and length (related to acceleration).
We hope the given mcq questions with Answers for Units and Measurements Class 11 helps you in your learning.
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Topics from which mcq questions may be asked
- Fundamental and derived units
- Errors and significant figures
- Dimensional analysis
Precision in measurement is the first step in every scientific discovery.
Frequently Asked Questions (FAQs) on Units and Measurements MCQ Questions
Q1: What is the best way to prepare for Class 11 Physics MCQ questions?
A1: The best way is to study NCERT concepts thoroughly, practice topicwise MCQs regularly, and focus on understanding fundamental principles rather than rote learning. Solving previous year MCQs and mock tests can boost accuracy and speed.
Q2: Are NCERT questions enough for Class 11 Physics MCQ-based exams?
A2: NCERT forms the base for all CBSE Physics MCQs. However, for better preparation, students should solve additional MCQs from reference books and practice HOTS and competency-based questions to develop deeper conceptual clarity.
Q3: Where can I find chapterwise Class 11 Physics MCQ questions with answers?
A3: You can find chapterwise MCQ questions with answers and detailed explanations on trusted educational platforms like xamcontent.com and physicsgurukul.com. These cover both basic and advanced-level questions.
Q4: Do CBSE Class 11 exams include MCQs?
A4: Yes, as per the latest CBSE exam pattern, objective questions, including MCQs, are part of the final exam paper. MCQs test conceptual understanding and application skills.
Q5: How to score high in Class 11 Physics MCQs?
A5: To score high, understand the theory from NCERT, solve a variety of MCQs (basic, conceptual, numerical), and regularly revise formulas and diagrams. Avoid guesswork and focus on time management during tests.
Q6: What are competency-based MCQs in Class 11 Physics?
A6: Competency-based MCQs assess a student’s ability to apply concepts in real-life or unfamiliar scenarios. These questions go beyond textbook definitions and require logical reasoning and application of physics principles.
