Class 11 Physics · Chapter 1 · Test 1
Physical Quantities and Uncertainty
44 MCQs This test covers physical quantities, SI base and derived units, prefixes, scientific notation and the conventions for writing SI units. It also covers non-SI units, least count, and absolute, fractional and percentage uncertainty.
43 questions · 35 min · 43 marks
Sample questions
The first 5 of 43. Try each one, then tap to see the answer.
Question 1
The purpose of studying physics is:
- ASpace exploration only
- BTo understand nature and develop technology for the benefit of the world
- CDestructive technology for warfare
- DChemistry research only
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Answer: B
Physics provides basic principles that help us understand nature and produce technology that turns dreams into realities.
Question 2
A steel pipe is between 0.7 m and 0.8 m long. Which instrument is appropriate for an accuracy of 0.001 m?
- AA micrometer screw gauge
- BA metre rule
- CA ten metres measuring tape
- DA Vernier Calipers
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Answer: B
A metre rule has a least count of 1 mm = 0.001 m so it suits this length and accuracy.
Question 3
The diameter of a ball is measured with Vernier Calipers and the reading is shown in the figure. What is the diameter of the ball?
- A1.30 cm
- B1.39 cm
- C1.40 cm
- D1.51 cm
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Answer: B
The main scale reading plus the Vernier scale coincidence multiplied by the least count gives 1.39 cm.
Question 4
One complete turn of the thimble is 0.50 mm and there are 50 lines on the circular scale. The reading shown on the micrometer gauge is:
- A3.67 mm
- B3.17 mm
- C4.17 mm
- D4.20 mm
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Answer: B
Least count = 0.50 mm / 50 = 0.01 mm. Reading = main scale reading + circular scale reading x least count = 3.17 mm.
Question 5
Significant figures are defined as:
- AThe digits in a measurement that we feel reasonably sure about
- BThe figures which are reasonably reliable
- CAll accurately known digits and the first doubtful digit
- DAll of the above
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Answer: D
All the given statements describe significant figures.
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