Solving the Class 11 Physics MCQ Questions of Units and Measurements with Answer can be of best assistance as you will know about every one of the ideas and concepts. Have a look at the MCQ Question and cross-check your answers during preparation. These MCQ Questions for Class 11 Units and Measurements with answers clear for a speedy amendment of the Chapter consequently assisting you with upgrading subject knowledge.

Here you will find the MCQ Question from Some of the fundamental units

• Mass
• Time
• Temperature
• Length
• Electric current

Learn various MCQ Questions for class 11 Physics which are given below: –

Practice MCQ Questions for class 11 Physics Chapter-Wise

1. Physical quantities are

(a) quantities such as degrees, radians and steradians
(b) quantities such as length, mass, time, electric current, thermodynamic temperature, amount of substance, and luminous intensity
(c) quantities such as pounds, dollars and rupees
(d) quantities such as kilos, pounds and gallons

2. The dimensions of kinetic energy is

(a) [M²L²T]
(b) [ML²T]
(c) [ML²T^-2]
(d) [ML²T^-1]

3. The atmospheric pressure is 10⁶ dyne/cm². What is its value in SI unit?

(a) 10⁵ newton/m²
(b) 10⁶ newton/m²
(c) 10⁴ newton/m²
(d) 10³ newton/m²

 4. In a system of units if force (F), acceleration (A) and time (T) are taken as fundamentals units then the dimensional formula of energy is

(a) FA²T
(b) FAT²
(c) FA²T
(d) FAT

5. The dimensions of kinetic energy is same as that of

(a) force
(b) pressure
(c) work
(d) momentum

6. Which of the following groups have different dimensions?

(a) Potential difference, EMF, voltage
(b) Pressure, stress, Youngs modulus
(c) Heat, energy, work done
(d) Dipole moment, electric flux, electric field

7. Electron volt is a unit of

(a) charge
(b) potential difference
(c) energy
(d) magnetic force

8. The volume of a cube in m³ is equal to the surface area of the cube in m². The volume of the cube is

(a) 64 m³
(b) 216 m³
(c) 512 m³
(d) 196 m³

9. In SI system the fundamental units are

(a) meter, kilogram, second, ampere, Kelvin, mole and candela
(b) meter, kilogram, second, coulomb, Kelvin, mole and candela
(c) meter, Newton, second, ampere, Kelvin, mole and candela
(d) meter, kilogram, second, ampere, Kelvin, mole and flux

10.  A particle starting from the origin (0, 0) moves in a straight line in the (x, y) plane. Its coordinates at a later time are the path of the particle makes with the x-axis an angle of

(a) 30°
(b) 45°
(c) 60° 
(d) 0°

11.  Absolute error of the measurement is

(a) the difference between the individual measurement and the true value of the quantity cubed
(b) the difference between the individual measurement and the true value of the quantity squared
(c) the difference between two individual measurements and their mean
(d) the difference between the individual measurement and the true value of the quantity

12. Light year is a unit of

(a) time
(b) distance
(c) sunlight intensity
(d) mass

13. Which one of the following pairs of quantities and their units is a proper match?

(a) Magnetic flux – weber
(b) Capacitance – henry
(c) Impulse – N/sec
(d) Power – farad

14. One second is defined to be equal to

(a) 9192631770 periods of the cesium clock
(b) 1650763.73 periods of the cesium clock
(c) 652189.63 periods of the krypton clock
(d) 1650763.73 periods of the krypton clock

15.  One pico farad is equal to

(a) 10^–12 farad
(b) 10^–24 farad
(c) 10^–18 farad
(d) 10^–6 farad

16. Torr’ is the unit of

(a) pressure
(b) volume
(c) density
(d) flux

17. Very large distances such as the distance of a Planet or a star from Earth can be measured by

(a) Parallax method
(b) All of these
(c) Millikan’s oil drop method
(d) Spectrograph

18. Unit of specific resistance is

(a) ohm – m
(b) ohm/m
(c) ohm m³
(d) ohm/m²

19. The division of energy by time is X. The dimensional formula of X is same as that of

(a) power
(b) electric field
(c) momentum
(d) torque

20. Which of the following is a dimensional constant?

(a) Gravitational constant
(b) Dielectric constant
(c) Refractive index
(d) Relative density

21. Systematic errors can be

(a) either positive or negative
(b) negative only
(c) positive only
(d) None of these

22. The magnitude of any physical quantity:

(a) depends on the method of measurement
(b) does not depend on the method of measurement
(c) is more in the SI system than in the CGS system
(d) is directly proportional to the fundamental units of mass, length and time

23. Temperature can be expressed as a derived quantity in terms of any of the following 

(a) Length and mass
(b) Mass and time
(c) Length, mass, and time
(d) None of these

24. Ampere - hour is a unit of 

(a) Quantity of electricity
(b) Strength of electric current
(c) Power
(d) Energy

25. Parsec is a unit of :

(a) Distance
(b) Velocity
(c) Time
(d) Angle

Answer:

1. Answer: (b) quantities such as length, mass, time, electric current, thermodynamic temperature, amount of substance, and luminous intensity

Explanation: In physics, a physical quantity is any physical property that can be quantified, that is, can be measured using numbers. Examples of physical quantities are mass, amount of substance, length, time, temperature, electric current, light intensity, force, velocity, density, and many others.

2. Answer: (c) [ML²T^-2]

Explanation: The formula for the kinetic energy is written as:

Kinetic energy = 1/2mv²

= M[LT⁻¹]²

= [ML²T^-2]

3. Answer: (a) 10⁵ newton/m²

Explanation: Pressure = F/A  

​∵10⁶dyne cm⁻²

=10⁵ Nm⁻²

 4. Answer: (b) FAT²

Explanation: E = KF^aA^bT^c 

[ML2T⁻²] = [MLT⁻²]^a [LT⁻²]^b [T]^c 

[ML²T⁻²] = [M^aL^a+bT^−2a−2b+c]

⇒ a = 1,a+b = 2 ⇒ b = 1

and −2a−2b+c=−2 ⇒ c = 2

∴E = KFAT²

5. Answer: (c) work

Explanation: The dimension of kinetic energy is the same as that of work.

6. Answer: (d) Dipole moment, electric flux, electric field

Explanation: Dipole moment = (charge) \(\times\) (distance)

Electric flux = (electric field) \(\times\) (area)

7. Answer: (c) energy

Explanation: electron volt, unit of energy commonly used in atomic and nuclear physics, equal to the energy gained by an electron (a charged particle carrying unit electronic charge) when the electrical potential at the electron increases by one volt.

8. Answer: (b) 216 m³

Explanation: Let length of side of the cube be a then volume of cube = a³

Also, surface area of cube = 6a²

Given, volume of cube = surface area of cube

or a³ = 6a²

⇒ a = 6 m

Thus, volume of the cube = (6)³ =216m³

9. Answer: (b) meter, kilogram, second, coulomb, Kelvin, mole and candela

Explanation: There are seven basic units in the SI system: the meter (m), the kilogram (kg), the second (s), the kelvin (K), the ampere (A), the mole (mol), and the candela (cd).

10.  Answer: (c) 60° 

Explanation: \(tan\theta=\frac{3}{\sqrt3}=\sqrt3\)

= tan 60°

11.  Answer: (a) the difference between the individual measurement and the true value of the quantity cubed

Explanation: Absolute error is simply the amount of physical error in a measurement. For example, if you know a length is 3.535 m + 0.004 m, then 0.004 m is an absolute error. Absolute error is positive. The absolute error is the difference between the measured value and the actual value.

12. Answer: (b) distance

Explanation: A light-year is a measurement of distance and not time (as the name might suggest). A light-year is the distance a beam of light travels in a single Earth year, or 6 trillion miles (9.7 trillion kilometers).

13. Answer: (a) Magnetic flux – weber

Explanation: The unit of the Electric field is N/C or V/m.

The unit of the magnetic field is Weber.

The unit of power is Watt.

The unit of the Capacitance is Farad.

14. Answer: (a) 9192631770 periods of the cesium clock

Explanation: The second is defined as being equal to the time duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the fundamental unperturbed ground-state of the caesium-133 atom.

15. Answer: (a) 10^–12 farad

Explanation: 1 pF (picofarad, one trillionth (10⁻¹²) of a farad) = 0.000000000001 F = 0.001 nF.

16. Answer: (a) pressure

Explanation: The torr (symbol: Torr) is a unit of pressure based on an absolute scale, defined as exactly 1760 of a standard atmosphere (101325 Pa).

17. Answer: (a) Parallax method

Explanation: Astronomers estimate the distance of nearby objects in space by using a method called stellar parallax, or trigonometric parallax. Simply put, they measure a star's apparent movement against the background of more distant stars as Earth revolves around the sun.

18. Answer: (a) ohm – m

Explanation: The metric unit for specific resistance is the ohm-meter (Ω-m), or ohm-centimeter (Ω-cm)

19. Answer: (a) power

Explanation: Energy per unit time is Power. Hence the dimensions would be of the Power.

20. Answer: (a) Gravitational constant

Explanation: Relative density, refractive index and Poisson ratio all the three are ratios, therefore they are dimensionless constants. Only universal gravitational constant has dimension [M⁻¹L³T²]. Others have no dimensions.

21. Answer: (a) either positive or negative

Explanation: Unlike random error, systematic errors tend to be consistently either positive or negative – because of this, systematic error is sometimes considered to be bias in measurement.

22. Answer: (b) does not depend on the method of measurement

Explanation: The magnitude of any physical quantity clocs not depend on the method of measurement because magnitude is absolute.

23. Answer: (d) None of these

Explanation: Temperature cannot be expressed in the terms of mass, length and time. Temperature is expressed in kelvin.

24. Answer: (a) Quantity of electricity

Explanation: Ampere-hour is the unit of quantity of electricity or quantity of electric charge.

25. Answer: (a) Distance

Explanation: The parsec (symbol: pc) is a unit of length used to measure the large distances to astronomical objects outside the Solar System, approximately equal to 3.26 light-years or 206,000 astronomical units (au), i.e. 30.9 trillion kilometres (19.2 trillion miles).

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