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 1 of 2
- 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: B8. 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. 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- A. 104 ergs
- B. 105 ergs
- C. 106 ergs
- D. 107 ergs
Explanation: One Joule is the amount of work done when a force of 1 newton displaces a mass through a distance of 1 meter in the direction of the force…
Correct answer: 107 ergs- A. Distance travelled by earth in one year
- B. Distance travelled by star in one year
- C. Distance travelled by light in one year
- D. Distance travelled by light in one galactic year
Explanation: The following is the solution:Option C is correct since it gives the right definition of one light year.Option A is incorrect since it…
Correct answer: Distance travelled by light in one year- A. (Amperes)2ohm
- B. Joules/ sec
- C. Amperes x volts
- D. Amperes/volt
Explanation: Power is measured in watts. P = I x V (power is current times voltage) and it is NOT current divided by voltage.
Correct answer: Amperes/volt- A. Kg ms-2
- B. Kgm2s-2
- C. Kgm2s-3
- D. None of these
Explanation: According to Newton's 2nd lawF=maWhere F is force , m is mass and a is acceleration .
Correct answer: Kg ms-2- A. Giga
- B. Tera
- C. Mega
- D. Deca
Explanation: The correct answer is Tera, as it represents 1012, the largest power of ten among the options.
Correct answer: Tera- A. Ampere
- B. Volt
- C. Coulomb
- D. Calorie
Explanation: The correct answer is Coulomb, which is the SI unit used to measure electric charge.
Correct answer: Coulomb- A. Am
- B. Js-1
- C. As
- D. C
Explanation: In terms of SI base units, 1 C is the equivalent of 1 ampere-second, which can be expressed as 1 C = 1 A ⋅ 1 s (or C = A ⋅ s).
Correct answer: As- A. Base Quantities
- B. Physical Quantities
- C. Derived Quantities
- D. Supplementary Quantities
Explanation: Physical Quantities, by definition, are quantities that can be measured with the help of an instrument to give a numerical value with a…
Correct answer: Physical QuantitiesPhysical Quantities and Units MCQs: common questions
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