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.
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262 questions · page 11 of 14
- A. 4.6 x 10^-3
- B. 4.6 x 10^-2 cm
- C. 460 x 10
- D. 46 x 10^-2
Explanation: To express 0.0046 in scientific notation, we want to represent it as a number between 1 and 10 multiplied by a power of 10.0.0046 can be…
Correct answer: 4.6 x 10^-3- A. 6.653 Km
- B. 0.635 Km
- C. 6.35 x 10^4 m
- D. 0.635 x 10^8 mm
Explanation: Comparing these values, the smallest quantity among the options is (0.635) kilometers, which corresponds to option B.
Correct answer: 0.635 Km- A. 3 x 10^6
- B. 3 x 10^18
- C. 3 x 10^12
- D. 3 x 10^-6
Explanation: The given question is 6×10-12 / 2×10-6. We divide the integers and powers of ten separately. 6/2 = 3 whereas 10-12 / 10-6 = 10-6.
Correct answer: 3 x 10^-6- A. 1.2 x 10^6
- B. 1.2 x 10^3
- C. 1.2 x 10^-6
- D. 1.2 x 10^-3
Explanation: To convert kg to g we will multiply by 1000. To convert cm to m we divide by 100 so, to convert cm3 to m3 we will divide by 1003 =…
Correct answer: 1.2 x 10^-3- A. 105 Nm-2
- B. 104 Nm-2
- C. 106 Nm-2
- D. 107 Nm-2
Explanation: 1 dyne per square centimeter (dyn/cm²) is equivalent to 0.1 pascal (Pa) in the International System of Units (SI).Therefore, 10⁶ dyn/cm²…
Correct answer: 105 Nm-2- A. 1/84,400 of means solar day
- B. 9192631770 vibrations of cesium atom
- C. 1/60th of minute
- D. 1/3156 x 10^7 of a year
Explanation: The present international standard of time, as measured by atomic clocks, is defined by the exact number of vibrations or oscillations of…
Correct answer: 9192631770 vibrations of cesium atom- A. Geometrical quantities
- B. Luminous intensity
- C. Electric current
- D. Temperature
Explanation: his is correct. The radian and steradian are indeed used to measure specific geometrical concepts:Radian: measures plane angles.Steradian…
Correct answer: Geometrical quantities- A. Gram, joule, and second.
- B. Gram, centimetre, and dyne.
- C. Kilogram, metre, and second.
- D. Kilogram, newton, and second.
Explanation: The correct answer is Option C: 'Kilogram, metre, and second'. These are the base units in the SI system for the fundamental quantities of…
Correct answer: Kilogram, metre, and second.- A. 0.001 cm.
- B. 0.1 mm.
- C. 1 mm.
- D. 1 cm
Explanation: The least count of a measuring instrument is the smallest measurement that can be accurately read.
Correct answer: 1 mm.- A. Gram, joule and second.
- B. Gram, centimetre and dyne.
- C. Kilogram, metre and second
- D. Kilogram, newton and second,
Explanation: The correct answer is Option C:kilogram, metre and second. These are the base units in the SI system for mass, length, and time…
Correct answer: Kilogram, metre and second- A. spherometre.
- B. screw gauge.
- C. measuring tape.
- D. Vernier callipers.
Explanation: The correct answer is the spherometre because it is designed to measure spherical objects accurately, making it the most appropriate…
Correct answer: spherometre.- A. I only
- B. III only
- C. I and II
- D. II and III
Explanation: A spherometer is a precision instrument primarily used to measure: * The radius of curvature of spherical surfaces, such as lenses and…
Correct answer: I only- A. A
- B. B
- C. C
- D. D
Explanation: L = n * (λ/4)where 'n' represents the harmonic number (n = 1, 3, 5, ...
Correct answer: B214. The given diagram shows two different scales on a Vernier callipers.The reading on the main scale is
- A. 6 cm
- B. 6.5 cm
- C. 7 cm
- D. 7.4 cm
Explanation: To determine the reading on the main scale of the Vernier caliper shown in the diagram, we need to observe the position of the zero mark…
Correct answer: 6.5 cm- A. 35
- B. 38
- C. 40
- D. 45
Explanation: To find the measurement using a screw gauge, you need to add the reading from the main scale to the reading from the circular scale.
Correct answer: 38- A. size of the object is very small.
- B. mass of the object is very large.
- C. speed of the object is equal to the speed of light
- D. speed of the object is much smaller than that of light.
Explanation: The relative change in mass, length, and time of an object can be observed when the speed of the object is much smaller than that of…
Correct answer: speed of the object is much smaller than that of light.- A. 327 ms-1
- B. 328 ms-1
- C. 330 ms-1
- D. 300 ms-1
Explanation: a) 327 m/s:This option provides a result with three significant figures.
Correct answer: 327 ms-1- A. 10%
- B. 4%
- C. 3%
- D. 2%
Explanation: b) 4%:This option suggests that the maximum error in the calculated density of the steel ball is 4%.
Correct answer: 4%- A. 5nJ -> 5 mJ -> 5 kJ -> 5 MJ
- B. 5 nJ -> 5 kJ -> 5 MJ -> 5 mJ
- C. 5 kJ -> 5 mJ -> 5 MJ -> 5 nJ
- D. 5 mJ -> 5 nJ -> 5 kJ -> 5 MJ
Explanation: In order to solve this you must know the value and symbol of the number prefix.
Correct answer: 5nJ -> 5 mJ -> 5 kJ -> 5 MJ- A. Green cadmium light
- B. Violet cadmium light
- C. Red cadmium light
- D. Blue cadmium light
Explanation: Michelson measured the length of the standard meter using the interference fringes produced by red cadmium light.
Correct answer: Red cadmium light