Back to UNITS & MEASUREMENTS

Your Progress

0 / 210 Answered

Correct

Incorrect

Accuracy

NEET • PHYSICS • UNITS & MEASUREMENTS

Units & measurements practice · Medium

Choose an answer to check it, or open “View answer” to study the explanation. Sign in to save progress to your account.

Practice format and chapter quiz

The practice player uses single-correct-answer MCQs. Chapter quizzes help you review a topic; they are not full-length NEET mock papers.

Take a chapter quiz →

Showing 91-120 of 210 questions

Preparing practice and saved progress…

91 Medium

91 of 210

Understanding +4 | -1

A student measured the diameter of a wire using a screw gauge with the least count

0.001 \mathrm{~cm}

and listed the measurements. The measured value should be recorded as

View answer and explanation

Correct option: D

5.320 \mathrm{~cm}

Option D is correct because the measured value should be recorded with the same number of decimal places as the least count of the instrument.

92 Medium

92 of 210

Analyzing +4 | -1

Which of the following is dimensionless?

View answer and explanation

Correct option: A

\frac{{{v^2}}}{{r\mathrm{g}}}

Option A (8) is correct because the time taken for collision is directly proportional to the side length when masses are scaled proportionally.

93 Medium

93 of 210

Analyzing +4 | -1

Assertion : The error in the measurement of radius of the
sphere is 0.3%.The permissible error in its surface area is
0.6%.
Reason : The permissible error is calculated by the formula

\frac{{\Delta A}}{A} = \frac{{4\Delta r}}{r}

View answer and explanation

Correct option: C

Assertion is correct, reason is incorrect

Assertion is correct, reason is incorrect. The assertion is correct, but the reason is incorrect. The correct formula for the permissible error is

\frac{{\Delta A}}{A} = 2\frac{{\Delta r}}{r}

94 Medium

94 of 210

Remembering +4 | -1

The quantity having the same units in all systems of units is

View answer and explanation

Correct option: B

time

Option B (time) is correct because the concept and measurement of time are fundamental and consistent across all systems of units.

95 Medium

95 of 210

Remembering +4 | -1

Universal time is based on

View answer and explanation

Correct option: C

Vibrations of cesium atom

Option C (Vibrations of cesium atom) is correct because Universal Time (UTC) is based on the atomic time standard provided by cesium atomic clocks.

96 Medium

96 of 210

Application +4 | -1

The velocity of a freely falling body changes as

{g^p}{h^q}

, where g is acceleration due to gravity and h is the height. The values of p and q are

View answer and explanation

Correct option: B

\frac{1}{2},\frac{1}{2}

Option B (

\frac{1}{2},\frac{1}{2}

) is correct because dimensional analysis confirms that the velocity is proportional to the square root of both g and h.

97 Medium

97 of 210

Understanding +4 | -1

The dimensions of couple are

View answer and explanation

Correct option: A

M{L^2}{T^{ - 2}}

Option A (

M{L^2}{T^{ - 2}}

) is correct because couple is defined as force times distance, and the dimensions of force are

MLT^{-2}

and distance is L.

98 Medium

98 of 210

Application +4 | -1

Consider a new system of units in which c(speed of light in vacuum), h(Planck’s constant) and G(gravitational constant) are taken as fundamental units. Which of the following would correctly represent mass in this new system?

View answer and explanation

Correct option: A

\sqrt {\frac{{hc}}{G}}

Option A (

\sqrt {\frac{{hc}}{G}}

) is correct because it gives the correct dimensional analysis for mass in terms of c, h, and G.

99 Medium

99 of 210

Analyzing +4 | -1

If L,C and R represent inductance, capacitance and resistance respectively, then which of the following does not represent dimensions of frequency

View answer and explanation

Correct option: D

\frac{C}{L}

Option D (

\frac{C}{L}

) is correct because the ratio of capacitance to inductance does not have the dimensions of frequency (which is inverse of time).

100 Medium

100 of 210

Understanding +4 | -1

The dimensions of

1/2\,\varepsilon {E^2}

are same as

View answer and explanation

Correct option: A

Energy density (energy per unit volume)

Option A (Energy density (energy per unit volume)) is correct because the expression

1/2 \epsilon E^2

represents the energy density stored in an electric field.

101 Medium

101 of 210

Understanding +4 | -1

Inductance L can be dimensionally represented as

View answer and explanation

Correct option: A

M{L^2}{T^{ - 2}}{A^{ - 2}}

Option A (

M{L^2}{T^{ - 2}}{A^{ - 2}}

) is correct because the energy stored in an inductor is given by

E = (1/2)LI^2

, so

L = (2E)/I^2

102 Medium

102 of 210

Application +4 | -1

One  light  year  is defined as the distance travelled by light in one year. The speed of light is

3 \times {10^8}\mathrm{m}{\mathrm{s}^{ - 1}}

. The same in metre is

View answer and explanation

Correct option: B

9.461 \times {10^{15}}m

Option B (

9.461 \times {10^{15}}m

) is correct because it is the product of the speed of light and the number of seconds in a year.

103 Medium

103 of 210

Application +4 | -1

The dimensions of universal gravitational constant are

View answer and explanation

Correct option: B

{M^{ - 1}}{L^3}{T^{ - 2}}

Option B (

{M^{ - 1}}{L^3}{T^{ - 2}}

) is correct because it is derived from Newton's law of gravitation, F = G(m1m2/r²).

104 Medium

104 of 210

Application +4 | -1

What is the area of a disc of radius 1.1 cm?

View answer and explanation

Correct option: D

3.8\mathrm{\;c}{\mathrm{m}^2}

Option D (

3.8\mathrm{\;c}{\mathrm{m}^2}

) is correct because the area should be rounded to two significant figures.

105 Medium

105 of 210

Remembering +4 | -1

One yard in SI units is equal

View answer and explanation

Correct option: B

0.9144 metre

Option B (0.9144 metre) is correct because it is the standard conversion factor between yards and meters.

Explore Other Chapters in PHYSICS

View All →

WORK-ENERGY-POWER 355 MCQs MECHANICAL PROPERTIES OF FLUIDS 317 MCQs MOTION IN PLANE 307 MCQs MAGNETIC EFFECT OF CURRENT 282 MCQs THERMAL PROPERTIES OF MATTER 269 MCQs GRAVITATION 258 MCQs

106 Medium

106 of 210

Application +4 | -1

The dimensional formula of magnetic flux is

View answer and explanation

Correct option: D

\left[ {\mathrm{M}{\mathrm{L}^2}{\mathrm{T}^{ - 2}}{\mathrm{A}^{ - 1}}} \right]

Option D ([

\mathrm{M}{\mathrm{L}^2}{\mathrm{T}^{ - 2}}{\mathrm{A}^{ - 1}}

]) is correct because magnetic flux is given by

\phi = B \cdot A

, where B is the magnetic field and A is the area. The dimension of B is [MT^-2A^-1] and the dimension of A is [L²], so the dimension of magnetic flux is [ML²T^-2A^-1].

107 Medium

107 of 210

Understanding +4 | -1

Crane is British unit of volume (one crane = 170.4742). convert crane into SI units.

View answer and explanation

Correct option: A

0.170474{m^3}

Option A (

0.170474{m^3}

) is correct because 1 crane is equal to 170.4742 liters, and 1 liter is equal to 0.001 cubic meters.

108 Medium

108 of 210

Remembering +4 | -1

Unit of moment of inertia in MKS system

View answer and explanation

Correct option: C

kg \times {m^2}

Option C (

kg \times {m^2}

) is correct because moment of inertia is mass times the square of the distance from the axis of rotation.

109 Medium

109 of 210

Understanding +4 | -1

Which of the following is not a dimensionless quantity?

View answer and explanation

Correct option: C

Permeability of free space

({\mu _0})

Option C (Permeability of free space

({\mu _0})

) is correct because permeability has dimensions, while the other options are dimensionless quantities.

110 Medium

110 of 210

Application +4 | -1

Frequency is the function of density (ρ) , length (a) and surface tension (T). Then its value is

View answer and explanation

Correct option: A

k\sqrt T /{\rho ^{1/2}}{a^{3/2}}

Option A (

k\sqrt T /{\rho ^{1/2}}{a^{3/2}}

) is correct because frequency depends on density, length, and surface tension, and dimensional analysis leads to this relationship.

111 Medium

111 of 210

Analyzing +4 | -1

Which of the following sets have different dimensions?

View answer and explanation

Correct option: D

Dipole moment, Electric flux, Electric field

Option D (Dipole moment, Electric flux, Electric field) is correct because dipole moment has dimensions of [LTA], electric flux has dimensions of [ML³T⁻³A⁻¹], and electric field has dimensions of [MLT⁻³A⁻¹], which are all different.

112 Medium

112 of 210

Understanding +4 | -1

A student has measured the length of a wire equal to 0.04580 m. This value of length has the number of significant figures equal to

View answer and explanation

Correct option: B

Four

Option B (Four) is correct because the number 0.04580 has four significant figures (4, 5, 8, and the trailing 0).

113 Medium

113 of 210

Understanding +4 | -1

Which of the following measurement is most precise?

View answer and explanation

Correct option: D

3.00 mm

Option D (3.00 mm) is correct because it has the smallest unit, indicating the highest precision.

114 Medium

114 of 210

Remembering +4 | -1

What is the use of thin strip at the back of Vernier caliper?

View answer and explanation

Correct option: B

For measuring depth of cylinder

Option B (For measuring depth of cylinder) is correct because the thin strip is designed for measuring depths.

115 Medium

115 of 210

Remembering +4 | -1

Size of universe is about

View answer and explanation

Correct option: D

10 million light years

Option D (10 million light years) is correct because the size of the observable universe is estimated to be around 10 million light years.

116 Medium

116 of 210

Understanding +4 | -1

Which is dimensionless?

View answer and explanation

Correct option: D

Energy/work

Option D (Energy/work) is correct because both energy and work have the same dimensions [ML²T⁻²], making their ratio dimensionless.

117 Medium

117 of 210

Application +4 | -1

A student measures the distance traversed in free fall of a body, initially at rest in a given time. He uses this data to estimate g, the acceleration due to gravity. If the maximum percentage errors in measurement of the distance and the time are

{e_1}

and

{e_2}

respectively, the percentage error in the estimation of g is

View answer and explanation

Correct option: B

{e_1} + 2{e_2}

Option B (

{e_1} + 2{e_2}

) is correct because the percentage error in g is the sum of the percentage error in distance and twice the percentage error in time.

118 Medium

118 of 210

Application +4 | -1

The specific resistance ρ of a circular wire of radius r. Resistance R and and length l is given by

\rho = \frac{{\mathrm{\pi }{r^2}R}}{l}.

Given,

r = 0:\left( {24 \pm 0.02} \right)cm,\,R = \left( {30 \pm 1} \right)\mathrm{\Omega }

and

l = \left( {4.80 \pm 0.01} \right)cm.

The percentage error in ρ is nearly

View answer and explanation

Correct option: D

0.202

Option D (0.202) is correct because it involves calculating the percentage error in specific resistance using the given formula and error values for r, R, and l.

119 Medium

119 of 210

Remembering +4 | -1

The dimensions of power are

View answer and explanation

Correct option: A

{M^1}{L^2}{T^{ - 3}}

Option A (

{M^1}{L^2}{T^{ - 3}}

) is correct because power is work done per unit time, and its dimensions are derived from the dimensions of work and time.

120 Medium

120 of 210

Analyzing +4 | -1

With the usual notations, the following equation

{S_t} = u + \frac{1}{2}a\left( {2t - 1} \right)\;

View answer and explanation

Correct option: C

Both numerically and dimensionally correct

Option C (Both numerically and dimensionally correct) is correct because the equation represents the distance traveled in the t-th second, which is both numerically and dimensionally consistent.

Revision notes and key takeaways

Review UNITS & MEASUREMENTS in your textbook or class notes, then use this set to check your understanding.

Showing 91-120 of 210 questions

Your Progress

Units & measurements practice · Medium

Explore Other Chapters in PHYSICS

Continue Your Practice

Your practice