Class 11 Physics · Chapter 1 · Test 2
Precision, Accuracy and Dimensions
46 MCQs This test covers the rules for significant figures, rounding, precision versus accuracy and the assessment of total uncertainty. It also covers dimensions of physical quantities, checking equations and deriving formulas by dimensional analysis.
46 questions · 35 min · 46 marks
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Sample questions
The first 5 of 46. Try each one, then tap to see the answer.
Question 1
The product 2.2 x 2.089 m^2 expressed to the appropriate number of significant figures is:
- A4.595 m^2
- B4.59 m^2
- C4.60 m^2
- D4.6 m^2
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Answer: D
The least accurate factor 2.2 has two significant figures so the answer is 4.6 m^2.
Question 2
The result of the division 45.2 / 6.0 in the appropriate number of significant figures is:
- A7.5
- B7.53
- C7.533
- D7.5333
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Answer: A
6.0 has two significant figures so the quotient is written as 7.5.
Question 3
The result of 24.4 m x 100.0 m / 5.0 m in the appropriate number of significant figures is:
- A488 m
- B4900 m
- C4.88 x 10^2 m
- D4.9 x 10^2 m
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Answer: D
The least accurate factor 5.0 has two significant figures so the answer is 4.9 x 10^2 m.
Question 4
The dimensions of energy are:
- A[MLT^-2]
- B[ML^2T^-2]
- C[ML^2T^-3]
- D[ML^-1T^-2]
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Answer: B
Kinetic energy = 1/2 mv^2 has dimensions M x (LT^-1)^2 = ML^2T^-2.
Question 5
Identify the pair which has identical dimensions:
- AWork and power
- BAngular momentum and torque
- CMoment of inertia and moment of force
- DImpulse and momentum
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Answer: D
Impulse = force x time = MLT^-1 which is the dimension of momentum.
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