Free Physical Quantities and Units MCQs with Answers
35 Physical Quantities and Units MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Physical quantities combine a numerical value with a unit, and are expressed using SI base units or derived units such as newtons, joules and pascals. The topic covers prefixes, unit conversion, dimensional analysis, significant figures and measurement uncertainty, while distinguishing scalar quantities from vectors where direction matters.
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35 questions · page 4 of 4
31. Which of the following is closest to a yard:
- A. 0.01 m
- B. 0.1 m
- C. 1 m
- D. 100 m
Explanation: The correct answer is 1 meter because a yard is approximately 0.9144 meters, making 1 meter the closest option. A yard is a unit of length used in the imperial system, and when converted to the metric system, it measures just under one meter. The other options are either too small (0.01 m and 0.1 m) or too large (100 m) to be considered close to a yard.
Correct answer: 1 m32. 1nm x 1km =
- A. 1um
- B. 1mm
- C. 1pm
- D. 1fm
Explanation: 1nm×1km=(10−9m)×(103m)=10−6m21 μm=10−6 m1nm×1km=1μm
Correct answer: 1um33. Which of the following is the correct way of writing units:
- A. 71 Newton
- B. 12mu s
- C. 8 Kg
- D. 43 kg m-3
Explanation: Option d is correct because it follows the standard convention for writing units in the International System of Units (SI).
Correct answer: 43 kg m-334. The SI unit of pressure is.
- A. Pascal
- B. mmHg
- C. torr
- D. atm
Explanation: The Pascal (Pa) is the SI unit of pressure, defined as one newton per square meter (N/m²). It is a measure of the force applied per unit area.
Correct answer: Pascal35. Mercury is 13.6 times as dense as water.
- A. Qualitative
- B. Quantitative
- C. Both A and B
- D. None of these
Explanation: The statement carries both kinds of information at once. It is qualitative in saying mercury is denser than water, and quantitative in fixing that comparison at a measured factor of 13.6. A purely qualitative statement would name the property without attaching any number to it.
Correct answer: Both A and B