Chapter Exam

Chapter 1: Units and Measurements — Online MCQ Test

Q: What is the SI unit of length?

Answer: A. Meter — The meter (m) is the fundamental SI unit for measuring length. Other options are either non-SI or derived units.

Q: Which of the following is NOT a fundamental unit in SI system?

Answer: C. Newton — Newton is a derived unit (unit of force = kg·m/s²). Kilogram, second, and ampere are fundamental SI units.

Q: The dimension of force is ___________.

Answer: A. [M L T⁻²] — Force = mass × acceleration, so dimensions are [M] × [L T⁻²] = [M L T⁻²].

Q: Among the following, which quantity has dimensions [M L T⁻³]?

Answer: C. Power — Power = Energy/Time, so dimensions are [M L² T⁻²]/[T] = [M L² T⁻³]. Note: The correct option shows [M L T⁻³] appears to be incorrect, but [M L² T⁻³] is power.

Q: Which of the following equations is dimensionally incorrect?

Answer: D. p = mv/t — For p = mv/t: [M L T⁻¹] ≠ [M][L T⁻¹]/[T] = [M L T⁻²]. The correct equation should be p = mv or F = ma = m(v/t).

PHYSICS · CLASS 11 FIRST PUC · Karnataka State Board

Practice Chapter 1: Units and Measurements with a free chapter-wise online MCQ test for Karnataka State Board CLASS 11 FIRST PUC PHYSICS. This chapter covers: With the senses like ears, eyes etc., scientists gather information and make observations. A few of them are like figuring out the colour and texture, while others would be complex.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 1: Units and Measurements — Important Questions & Answers (FAQ)

Frequently asked questions from Karnataka State Board CLASS 11 FIRST PUC PHYSICS — Chapter 1: Units and Measurements, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is the SI unit of length?

A. Meter ✓
B. Centimeter
C. Kilometer
D. Foot

Answer: A. Meter
The meter (m) is the fundamental SI unit for measuring length. Other options are either non-SI or derived units.

Which of the following is NOT a fundamental unit in SI system?

A. Kilogram
B. Second
C. Newton ✓
D. Ampere

Answer: C. Newton
Newton is a derived unit (unit of force = kg·m/s²). Kilogram, second, and ampere are fundamental SI units.

The dimension of force is ___________.

A. [M L T⁻²] ✓
B. [M L² T⁻²]
C. [M L T⁻¹]
D. [M L² T⁻¹]

Answer: A. [M L T⁻²]
Force = mass × acceleration, so dimensions are [M] × [L T⁻²] = [M L T⁻²].

Among the following, which quantity has dimensions [M L T⁻³]?

A. Force
B. Energy
C. Power ✓
D. Momentum

Answer: C. Power
Power = Energy/Time, so dimensions are [M L² T⁻²]/[T] = [M L² T⁻³]. Note: The correct option shows [M L T⁻³] appears to be incorrect, but [M L² T⁻³] is power.

Which of the following equations is dimensionally incorrect?