NEET Physics Mock Test

Units, Measurements & Dimensions

NEET Physics Mock Test

Units, Measurements & Dimensions

Instructions

• Each question carries 4 marks.
• 1 Mark will be deducted for each incorrect answer.
• Select an option and click 'Show Answer' to verify.

1

The dimensional formula for thermal conductivity is:

[A] \( M^1L^1T^{-3}\Theta^{-1} \)

[B] \( M^1L^{-3}T^{-1}\Theta^{-1} \)

[C] \( M^1L^1T^{-3}\Theta \)

[D] \( M^3L^{-1}T^{-3}\Theta \)

Answer: [A] — From Fourier’s Law.

2

Newton-second is the unit of:

[A] Velocity

[B] Angular momentum

[C] Momentum

[D] Energy

Answer: [C]

3

A light-year is a unit of:

[A] Time

[B] Distance

[C] Energy

[D] Luminous intensity

Answer: [B]

4

Which pair has identical dimensions?

[A] Stress and Pressure

[B] Tension and Surface tension

[C] Planck's constant and Angular momentum

[D] Angle and Strain

Answer: [C]

5

The SI unit of luminous intensity is:

[A] Candela

[B] Lux

[C] Lumen

[D] Tesla

Answer: [A]

6

If \(L = 2.331 \text{cm}\) and \(B = 2.1 \text{cm}\), \(L + B =\)?

[A] 4.431 cm

[B] 4.43 cm

[C] 4.4 cm

[D] 4 cm

Answer: [C]

7

The mass of a silver wire is (0.6 ± 0.006) g, radius (0.5 ± 0.005) mm, length (4 ± 0.04) cm. Maximum % error in density is:

[A] 4%

[B] 3%

[C] 6%

[D] 7%

Answer: [A]

8

In vernier calipers, 20 vernier divisions match 16 main scale divisions (1 MSD = 1 mm). Least count = ?

[A] 0.02 mm

[B] 0.05 mm

[C] 0.1 mm

[D] 0.2 mm

Answer: [D]

9

Which of the following pairs have the same dimensions?

[A] Energy and Angular momentum

[B] Impulse and Momentum

[C] Power and force

[D] Stress and Pressure

Answer: [B]

10

The SI unit of universal gravitational constant (G) is:

[A] N·m²/kg²

[B] J/kg·K

[C] m/s²

[D] kg/m³

Answer: [A]

11

Which physical quantity has dimensions $$ ML^2T^{-2} $$?

[A] Energy

[B] Momentum

[C] Power

[D] Force

Answer: [A]

12

How many base units are there in SI system?

[A] 7

[B] 6

[C] 8

[D] 9

Answer: [A]

13

Which of the following is dimensionless?

[A] Strain

[B] Pressure

[C] Power

[D] Mass

Answer: [A]

14

Which one is the physical quantity with SI unit of coulomb?

[A] Electric charge

[B] Capacitance

[C] Current

[D] Resistance

Answer: [A]

15

Which is the correct dimensional formula of Young’s modulus?

[A] $$ML^{-1}T^{-2}$$

[B] $$MLT^{-2}$$

[C] $$ML^2T^{-2}$$

[D] $$ML^{-2}T^2$$

Answer: [A]

16

The unit of Stefan’s constant is:

[A] W/m²K⁴

[B] J·kg⁻¹K⁻¹

[C] J/K

[D] N/C

Answer: [A]

17

Which of the following is not a fundamental quantity?

[A] Time

[B] Temperature

[C] Mass

[D] Velocity

Answer: [D]

18

Dimensional formula of pressure is:

[A] $$ML^{-1}T^{-2}$$

[B] $$MLT^{-2}$$

[C] $$MT^{-1}$$

[D] $$ML^2T^{-2}$$

Answer: [A]

19

Relative density has:

[A] No dimension

[B] Dimension of density

[C] Dimension of mass

[D] Dimension of volume

Answer: [A]

20

Which is the correct dimensional formula for resistance?

[A] $$ML^2T^{-3}A^{-2}$$

[B] $$ML^2T^{-2}A^{-2}$$

[C] $$ML^2T^{-3}A^{-1}$$

[D] $$ML^2T^{-2}A^{-1}$$

Answer: [A]

21

The dimensional formula for surface tension is:

[A] $$MT^{-2}$$

[B] $$ML^0T^{-2}$$

[C] $$MLT^{-2}$$

[D] $$ML^{-2}T^{-2}$$

Answer: [A]

22

Which pair is not dimensionally same?

[A] Torque, Work

[B] Energy, Work

[C] Impulse, Momentum

[D] Power, Force

Answer: [D]

23

The dimensional formula for Planck's constant is:

[A] $$ML^2T^{-1}$$

[B] $$MLT^{-1}$$

[C] $$ML^2T^{-2}$$

[D] $$ML^{-2}T^2$$

Answer: [A]

24

The SI unit of entropy is:

[A] J/K

[B] J·kg⁻¹

[C] W/K

[D] J

Answer: [A]

25

The dimensional formula of specific heat is:

[A] $$L^2T^{-2}\theta^{-1}$$

[B] $$ML^2T^{-2}\theta^{-1}$$

[C] $$ML^0T^{-2}\theta^{-1}$$

[D] $$ML^2T^{2}\theta^{-1}$$

Answer: [B]

26

The percentage error in mass (m), velocity (v), and radius (r) are 2%, 4%, and 3% respectively. Find % error in kinetic energy?

[A] 10%

[B] 8%

[C] 4%

[D] 12%

Answer: [A]

27

The dimensional formula of magnetic induction (B) is:

[A] $$MT^{-2}A^{-1}$$

[B] $$MLT^{-2}A^{-1}$$

[C] $$MT^{-1}A^{-1}$$

[D] $$M^{-1}LT^{-2}A^{-1}$$

Answer: [A]

28

The SI unit of elastic modulus is:

[A] Pascal

[B] Henry

[C] Joule

[D] Ohm

Answer: [A]

29

Which quantity is measured in ampere-hour?

[A] Quantity of charge

[B] Current

[C] Power

[D] Voltage

Answer: [A]

30

The SI unit for measuring luminous intensity is:

[A] Candela

[B] Lux

[C] Lumen

[D] Tesla

Answer: [A]

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