Units and Measurement NEET MCQ

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Welcome to Units and Measurement NEET MCQ, your essential guide to mastering the fundamentals of units and measurements! In this comprehensive collection of multiple-choice questions (MCQs), each question is thoughtfully accompanied by both the correct answer and a detailed explanation. Designed specifically for NEET (National Eligibility-cum-Entrance Test) preparation, these MCQs serve as a powerful tool to not only test your knowledge of units and measurements but also to provide you with a thorough understanding of the subject.

1. Which of the following is the SI unit of force?

a) Dyne
b) Newton
c) Gram-force
d) Pound

Answer:

b) Newton

Explanation:

The SI (System International) unit of force is the Newton (N).

2. How many significant figures are in the number 0.005600?

a) 2
b) 3
c) 4
d) 5

Answer:

b) 3

Explanation:

The significant figures in the number are 5, 6, and 0 after the 6.

3. What is the unit of luminous intensity in the SI system?

a) Candela
b) Lux
c) Lumen
d) Radiant

Answer:

a) Candela

Explanation:

The SI unit for luminous intensity is Candela.

4. 1 micron is equal to:

a) 10^-3 m
b) 10^-6 m
c) 10^-9 m
d) 10^-12 m

Answer:

b) 10^-6 m

Explanation:

1 micron is equivalent to 10^-6 meters.

5. The dimensional formula for gravitational constant (G) is:

a) [M^-1 L^3 T^-2]
b) [M L^2 T^-2]
c) [M L^-1 T^-2]
d) [M^2 L^3 T^-1]

Answer:

a) [M^-1 L^3 T^-2]

Explanation:

Dimension of G is [M^-1 L^3 T^-2].

6. Which is a scalar quantity?

a) Velocity
b) Displacement
c) Acceleration
d) Mass

Answer:

d) Mass

Explanation:

Mass is a scalar as it has magnitude only without direction.

7. The number of significant figures in 0.06900 is:

a) 2
b) 3
c) 4
d) 5

Answer:

c) 4

Explanation:

The significant figures are 6, 9, and the two zeroes after 9.

8. If the actual length of an object is 4.5 cm and the measured length is 5.0 cm, the relative error is:

a) 0.1
b) 0.5
c) 0.11
d) 0.56

Answer:

c) 0.11

Explanation:

Relative error = (Measured value – Actual value) / Actual value = (5.0 – 4.5) / 4.5 = 0.11.

9. The unit of Planck's constant is:

a) Js
b) J/m
c) Jm
d) J/s

Answer:

a) Js

Explanation:

Planck's constant (h) has a unit of Joule second (Js).

10. Which is a fundamental unit?

a) Newton
b) Joule
c) Kelvin
d) Watt

Answer:

c) Kelvin

Explanation:

Kelvin is a fundamental unit representing temperature.

11. Parsec is a unit of:

a) Time
b) Distance
c) Speed
d) Frequency

Answer:

b) Distance

Explanation:

Parsec is a unit of astronomical distance.

12. One atmospheric pressure is equal to:

a) 760 mm of Hg
b) 1 mm of Hg
c) 1000 Pa
d) 2000 bar

Answer:

a) 760 mm of Hg

Explanation:

One atmospheric pressure is equivalent to 760 mm of mercury column.

13. The dimensions of impulse are equivalent to:

a) Force
b) Energy
c) Momentum
d) Power

Answer:

c) Momentum

Explanation:

Impulse and momentum both have dimensions [MLT^-1].

14. Light year is a unit of:

a) Time
b) Speed of light
c) Distance
d) Frequency

Answer:

c) Distance

Explanation:

A light year is the distance light travels in one year.

15. The number 0.00678 rounded off to three significant figures is:

a) 0.00678
b) 0.0068
c) 0.00680
d) 0.007

Answer:

b) 0.0068

Explanation:

Rounding off to three significant figures, the number becomes 0.0068.

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