JEE Physics Units and Measurements MCQs Set 01

Physics Objective Questions and Answers: Units and Measurements

Access targeted multiple-choice questions for Units and Measurements designed to align with the latest JEE academic syllabus for JEE Physics. These objective practice sets help students evaluate their conceptual understanding and improve exam readiness.

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Navigate directly to the 50 objective questions for Units and Measurements using the digital viewer below. Each practice set includes verified answer keys, allowing students to instantly cross-check their work and identify areas requiring further revision.

 

Question: The base quantity among the following is

  • a) Length
  • b) Area
  • c) Speed

Answer: Length

 

Question: Which of the following is not a unit of time?

  • a) Light year
  • b) Hour
  • c) Minute

Answer: Light year

 

Question: One astronomical unit is a distance equal to

  • a) 1.496 × 1011 m
  • b) 9.46 × 1015 m
  • c) 3 × 108 m
  • d) None of this

Answer: 1.496 × 1011 m

 

Question: The volume of a cube having sides 1.2 m is appropriately expressed as

  • a) 1.728 × 106 cm3
  • b) 1.7 × 106 cm3
  • c) 1.8 × 106 cm3
  • d) All of these

Answer: 1.728 × 106 cm3

 

Question: Ampere second is a unit of

  • a) Charge
  • b) Current
  • c) Energy
  • d) Power

Answer: Charge

 

Question: The most precise reading of the mass of an object, among the following is

  • a) 20.01 g
  • b) 20 × 100 g
  • c) 20.0 g
  • d) 20 g

Answer: 20.01 g

 

Question: The most accurate reading of the length of a 6.28 cm long fibre is

  • a) 6.5 cm
  • b) 6 cm
  • c) 5.99 cm
  • d) 6.0 cm

Answer: 6.5 cm

 

Question: Which of the following is a unit that of force?

  • a) mN
  • b) N m
  • c) nm
  • d) N s

Answer: mN

 

Question:  The value of 60° in radian is

  • a)

    9

  • b)

    9a

  • c)

    9c

  • d) All of these

Answer:

9

 

Question: The total plane angle subtended by a circle at its centre is

  • a)

    10b

  • b)

    10a

  • c)

    10

  • d)

    10d

Answer:

10b

 

Question:

11

  • a)

    11

  • b)

    111

  • c)

    11b

  • d) All of these

Answer:

11

 

Question: One unified atomic mass unit represents a mass of magnitude

  • a) 1.66 × 10–27kg
  • b) 1030 kg
  • c) 1.66 × 1027 kg
  • d) 10–30 kg

Answer: 1.66 × 10–27kg

 

Question: If the average life of a person is taken as 100 s, the age of the universe on this scale is of the order

  • a) 1010 s
  • b) 108 s
  • c) 1017 s
  • d) 109 s

Answer: 1010 s

 

Question: Which of the following is the most precise measurement?

  • a) 300 × 10–5 m
  • b) 30 × 10–4 m
  • c) 0.0030 m
  • d) 3 × 10–3 m

Answer:  300 × 10–5 m

 

Question: The number of significant figures in a pure number 410 is

  • a) Infinite
  • b) One
  • c) Three
  • d) Two

Answer: Infinite

 

Question: Thickness of a pencil measured by using a screw gauge (least count .001 cm) comes out to be 0.802 cm. The percentage error in the measurement is

  • a) 0.125%
  • b) 2.43%
  • c) 4.12%
  • d) 2.14%

Answer: 0.125%

 

Question: The percentage error in the measurement of the voltage V is 3% and in the measurement of the current is 5%2%. The percentage error in the measurement of the resistance is

  • a) 5%
  • b) 1%
  • c) 2%
  • d) 3%

Answer: 5%

 

Question:  The relative error in the measurement of the side of a cube is 0.027. The relative error in the measurement of its volume is

  • a) 0.081
  • b) 0.046
  • c) 0.054
  • d) 0.027

Answer: 0.081

 

Question: Zero error in an instrument introduces

  • a) Systematic error
  • b) Random error
  • c) Least count error
  • d) Personal error

Answer: Systematic error

 

Question: A packet contains silver powder of mass 20.23 g ± 0.01 g. Some of the powder of mass 5.75 g ± 0.01 g is taken out from it. The mass of the powder left back

  • a) 14.48 ± 0.02 g
  • b) 14.48 g ± 0.00 g
  • c) 14.5 g ± 0.1 g
  • d) 14.5 g ± 0.2 g

Answer: 14.48 ± 0.02 g

 

More Questions..............................

 

Question: The addition of three masses 1.6 g, 7.32 g and 4.238 g, addressed upto proper decimal places is

  • a) 13.2 g
  • b) 13.158 g
  • c) 13.16 g
  • d) 13.15 g

Answer: 13.2 g

 

Question: The area of a sheet of length 10.2 cm and width 6.8 cm addressed upto proper number of significant figures is

  • a) 69 cm2
  • b) 70 cm2
  • c) 69.4 cm2
  • d) 69.36 cm2

Answer: 69 cm2

 

Question:  The radius of a sphere is (2.6 ± 0.1) cm. The percentage error in its volume is

  • a)

    23b

  • b)

    23c

  • c)

    23d

  • d) None of this

Answer:

23b

 

Question: The uncertain digit in the measurement of a length reported as 41.68 cm is

  • a) 8
  • b) 6
  • c) 1
  • d) 4

Answer: 8

 

Question: We can reduce random errors by

  • a) Taking large number of observations
  • b) By following proper technique of experiment
  • c) Corrected zero error
  • d) Al of this

Answer: Taking large number of observations

 

Question: The number of significant figures in the measured value 0.0204 is

  • a) Three
  • b) Five
  • c) Four
  • d) Two

Answer: Three

 

Question: The number of significant figures in the measured value 26000 is

  • a) Two
  • b) Five
  • c) Three
  • d) Infinite

Answer: Two

 

Question: The number of significant zeroes present in the measured value 0.020040, is

  • a) Three
  • b) One
  • c) Two
  • d) Five

Answer: Three

 

Question: The number of significant figures in the measured value 4.700 m is the same as that in the value

  • a) 470.0 m
  • b) 4070 m
  • c) 0.047 m
  • d) 4700 m

Answer: 470.0 m

 

Question:  If a calculated value 2.7465 g contains only three significant figures, the two insignificant digits in it are

  • a) 6 and 5
  • b) 4 and 6
  • c) 7 and 4
  • d) 2 and 7

Answer: 6 and 5

 

Question: An object of mass 4.237 g occupies a volume 1.72 cm3. The density of the object to appropriate significant figures is

  • a) 2.46 g cm–3
  • b) 2.463 g cm–3
  • c) 2.5 g cm–3
  • d) 2.50 g cm–3

Answer: 2.46 g cm–3

 

Question: Round off the value 2.845 to three significant figures

  • a) 2.84
  • b) 2.85
  • c) 2.80
  • d) 2.83

Answer:  2.84

 

Question: A length 5.997 m rounded off to three significant figures is written as

  • a) 6.00 m
  • b) 5.99 m
  • c) 5.95 m
  • d) 5.90 m

Answer: 6.00 m

 

Question: The order of the magnitude of speed of light in SI unit is

  • a) 8
  • b) 16
  • c) 4
  • d) 7

Answer: 8

 

Question: The values of a number of quantities are used in a mathematical formula. The quantity that should be most precise and accurate in measurement is the one

  • a) Having smallest magnitude
  • b) Used in the numerator
  • c) Having largest magnitude
  • d) Used in the denominator

Answer: Having smallest magnitude

 

Question: What are the dimensions of the change in velocity?

  • a) [LT–1]
  • b) [MLT–1]
  • c) [LT–2]
  • d) None of this

Answer: [LT–1]

 

Question: The dimensional formula for energy is

  • a) [ML2T–2]
  • b) [MLT–2]
  • c) [M–1L2T]
  • d) All of these

Answer: [ML2T–2]

 

Question: The pair of the quantities having same dimensions is

  • a) Wavelength, focal length
  • b) Displacement, velocity
  • c) Time, frequency
  • d) Force, acceleration

Answer: Wavelength, focal length

 

Question: The dimensional formula for relative refractive index is

  • a) [M0L0T0]
  • b) [M1L0T0]
  • c) [M1L1 T1]
  • d) [MLT–1]

Answer: [M0L0T0]

 

Question: The dimensional formula [ML–1T–2] is for the quantity

  • a) Pressure
  • b) Acceleration
  • c) Force
  • d) Work

Answer: Pressure

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Multiple Choice Questions (MCQs) for JEE Physics Units and Measurements

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