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Physical World and Measurement Practice Questions

NEET · Physics · 1324 free MCQs with instant results and detailed explanations.

1324
Total
331
Easy
562
Medium
431
Hard

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Topics in Physical World and Measurement

Units and Dimensions 321
Errors in Measurement 184
Significant Figures 167
Physics Scope 176
Units and Measurements 138
Dimensional Analysis 175
Errors 163

Sample Questions from Physical World and Measurement

Here are 10 sample questions. Start a quiz to get randomized questions with scoring.

Q1
Easy
If the length is measured in meters and time in seconds, what is the unit of speed?
A. m/s
B. kg/s
C. m²/s
D. J/s
Show Answer & Explanation
Correct Answer: A
Speed is defined as distance divided by time. Therefore, if distance is in meters and time in seconds, the unit of speed is meters per second (m/s).
Q2
Easy
What dimension does the unit of energy (Joule) have?
A. [M1 L2 T-2]
B. [M1 L1 T-2]
C. [M1 L1 T-1]
D. [M0 L1 T0]
Show Answer & Explanation
Correct Answer: A
A Joule is defined as the work done when a force of one Newton displaces an object by one meter. Hence, its dimensional formula is [M1 L2 T-2].
Q3
Easy
Which of the following is a derived unit in SI?
A. Newton
B. Meter
C. Kilogram
D. Second
Show Answer & Explanation
Correct Answer: A
The Newton is a derived unit as it is based on the base units of mass (kilogram), length (meter), and time (second).
Q4
Medium
What is the dimension of the gravitational constant G?
A. [M^-1 L^3 T^-2]
B. [M L^2 T^-2]
C. [M^1 L^3 T^-1]
D. [M^-1 L^2 T^2]
Show Answer & Explanation
Correct Answer: A
The dimensional formula of G is derived from Newton's law of gravitation, which shows it as [M^-1 L^3 T^-2].
Q5
Medium
Which of the following is a base unit in the SI system?
A. Newton
B. Joule
C. Meter
D. Volt
Show Answer & Explanation
Correct Answer: C
The meter is a base unit in the SI system, while the others are derived units.
Q6
Medium
What are the dimensions of pressure?
A. [M L^-1 T^-2]
B. [M L^1 T^-2]
C. [M L^2 T^-2]
D. [M^1 L^2 T^-1]
Show Answer & Explanation
Correct Answer: A
Pressure is defined as force per unit area, which gives its dimensions as [M L^-1 T^-2].
Q7
Medium
Which of the following quantities has the dimension [M^0 L^0 T^0]?
A. Mass
B. Length
C. Time
D. Numerical Value
Show Answer & Explanation
Correct Answer: D
A numerical value is dimensionless, hence it has dimensions of [M^0 L^0 T^0].
Q8
Hard
If the speed of light is considered as 3 x 10^8 m/s, which of the following represents the unit of energy in terms of fundamental dimensions?
A. M^1L^2T^-2
B. M^2L^2T^-1
C. M^1L^2T^-1
D. M^1L^1T^-1
Show Answer & Explanation
Correct Answer: A
Energy is defined as work done, and work is force times distance. The unit of force is kg·m/s², and work (energy) is therefore kg·m²/s², which simplifies to M^1L^2T^-2.
Q9
Hard
Which of the following quantities is dimensionally consistent with the equation: F = ma + mg?
A. Force
B. Acceleration
C. Mass
D. Energy
Show Answer & Explanation
Correct Answer: A
Both 'ma' and 'mg' represent forces; therefore, the left side of the equation must also represent force, ensuring dimensional consistency.
Q10
Hard
The dimension of the gravitational constant G is expressed as M^-1L^3T^-2. What is the dimension of the quantity G in terms of energy?
A. M^1L^2T^-2
B. M^-1L^2T^-2
C. M^2L^2T^-2
D. M^1L^1T^-1
Show Answer & Explanation
Correct Answer: A
The gravitational potential energy U = -G(m1*m2)/r results in G having dimensions that ultimately equate to energy dimensions when rearranged.

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Physical World and Measurement — NEET Physics Practice Questions Online

This page contains 1324 practice MCQs for the chapter Physical World and Measurement in NEET Physics. The questions are organized by difficulty — 331 easy, 562 medium, 431 hard — so you can choose the right level for your preparation.

Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 7 topics, giving you comprehensive coverage of the entire chapter.