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 2 of 2
- A. 1
- B. 2
- C. 3
- D. 4
Explanation: Given,Area= circumference πr² = 2πrCutting π and r on both sidesr = 2
Correct answer: 2- A. bar
- B. atm
- C. Pascal
- D. erg
Explanation: Fact. According to the formula Pressure=Force/Area 1 N/m2 = 1 Pascal
Correct answer: Pascal- A. 1/24 x 1/60 x 1/60 of a mean solar day
- B. The second as defined by the electronic digital watch
- C. Duration of 9,192,631,770 vibrations of a cesium-133 atom
- D. Minute
Explanation: The SI unit of time is the second, symbolized as 's'. The modern definition is based on the cesium-133 atom's vibrations: specifically…
Correct answer: Duration of 9,192,631,770 vibrations of a cesium-133 atom- A. 1.7588×10^19 Coulomb
- B. 1.6022×10^-19 Coulomb
- C. 1.2057×10^19 Coulomb
- D. 0.6022×10^19 Coulomb
Explanation: 1.6022×10^-19 Coulomb: This option is correct. The charge of an electron is approximately -1.6022×10^-19 Coulomb.
Correct answer: 1.6022×10^-19 Coulomb- A. Weber
- B. Weber meter^-2
- C. Tesla
- D. Henry
Explanation: Henry is the SI unit of inductance, symbolized by the letter H.
Correct answer: Henry- A. 4/3 π radian
- B. 4/3 π steradian
- C. 4 π radian
- D. 4 π streradian
Explanation: One steradian is the solid angle of a sphere subtended by a portion of the surface whose area is equal to the square of the sphere's…
Correct answer: 4 π streradian- A. 50 mA
- B. 50 µA
- C. 500 mA
- D. 500 µA
Explanation: The current of 0.05 A can be expressed as 50 mA because 'milli' means one thousandth, making 0.05 A equivalent to 50 milliamperes.
Correct answer: 50 mA- A. 104
- B. 109
- C. 10-6
- D. 1012
Explanation: Tera donates multiplication by one trillion or 10¹².OPTION A: The prefix "myria" OPTION B: The prefix "Giga" stands for 10^9.OPTION C: The…
Correct answer: 1012- A. Mass, acceleration, temperature, kinetic energy
- B. Mass, volume, electrical potential, kinetic energy
- C. Acceleration, temperature, volume, electric charge
- D. Momentum, electric intensity, density, magnetic flux.
Explanation: A scalar quantity contains only magnitude and no direction, making options B the correct answer.
Correct answer: Mass, volume, electrical potential, kinetic energy- A. Kg m s-1
- B. Kg m-1 s-2
- C. Kg m2 s-2
- D. Kg m-2 s-1
Explanation: Pressure is calculated as force per unit area. In this case, the correct unit of pressure is Kg m-1 s-2.
Correct answer: Kg m-1 s-2- 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.
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: 1um- 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-3- 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).
Correct answer: Pascal- 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…
Correct answer: Both A and B