Chapter 1: Units and Measurements — Online MCQ Test
PHYSICS · CLASS 11 FIRST PUC · Karnataka State Board
Practice Chapter 1: Units and Measurements with a free chapter-wise online MCQ test.
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....
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Chapter 1: Units and Measurements — Important Questions & Answers
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.
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.
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].
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.
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?
- A. v = u + at
- B. s = ut + ½at²
- C. F = ma
- D. p = mv/t
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).
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).