Free Measurements MCQs with Answers
262 Measurements 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 are expressed with SI base and derived units, while measurement limits are described through accuracy, precision, absolute and percentage error, and significant figures. Dimensional analysis checks equations, derives relationships and detects inconsistent units, but it cannot determine numerical constants or distinguish quantities with identical dimensions.
Last updated
262 questions · page 13 of 14
- A. 7
- B. 8
- C. 5
- D. 3
Explanation: The number of significant figures in a measurement includes all the certain digits plus the first uncertain digit.
Correct answer: 7- A. 3 s.f
- B. 2 s.f
- C. 5 s.f
- D. 8 s.f
Explanation: When determining the number of significant figures in a measurement, focus on the digits that are known with certainty and the first…
Correct answer: 3 s.f- A. Five
- B. One
- C. Two
- D. Three
Explanation: All non zero digits are significant figures and in this case there are 3 significant or non zero digits hence option D is the right choice.
Correct answer: Three- A. Adjusting an ammeter to remove its zero error before measuring a current
- B. Measuring several internodal distances on a standing wave to find the mean internodal distance
- C. Measuring the diameter of a wire repeatedly and calculating the average
- D. Timing a large number of oscillations to find a period
Explanation: Systematic error means that measurements of the same thing will vary in predictable ways.
Correct answer: Adjusting an ammeter to remove its zero error before measuring a current- A. 17%
- B. 30%
- C. 15%
- D. 90%
Explanation: Kinetic Energy = mv^2/2Percentage Error in KE = Percentage Error in Mass + 2(Percentage Error in Speed) The question states percentage…
Correct answer: 17%- A. 0
- B. 1
- C. 2
- D. 3
Explanation: The number 500 is a whole number and has three significant figures: the digit '5' and the two trailing zeros.
Correct answer: 3- A. 2%
- B. 4%
- C. 6%
- D. 8%
Explanation: First we find out the % uncertainty in current (0.05)/2.5 x 100 = 2%. Then we note the formula of power dissipated is 12 x R so the =…
Correct answer: 6%- 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 streradian254. A student measures a current as 0.05 A. Which of the following correctly expresses this result?
- 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 m259. 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