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Units and Measurements Practice Questions

JEE · Physics · 1305 free MCQs with instant results and detailed explanations.

1305
Total
285
Easy
578
Medium
442
Hard

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Topics in Units and Measurements

SI Units 290
Vernier and Screw Gauge 186
Errors in Measurement 198
Dimensional Analysis 313
Significant Figures 318

Sample Questions from Units and Measurements

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

Q1
Easy
The SI unit for electric current is:
A. Volt
B. Ampere
C. Ohm
D. Watt
Show Answer & Explanation
Correct Answer: B
The ampere is the base unit of electric current in the SI system.
Q2
Easy
What SI unit is used for measuring luminous intensity?
A. Lumen
B. Lux
C. Candela
D. Foot-candle
Show Answer & Explanation
Correct Answer: C
Candela is the SI unit of luminous intensity.
Q3
Easy
Which of the following is the SI unit for the amount of substance?
A. Mole
B. Gram
C. Liter
D. Cubic Meter
Show Answer & Explanation
Correct Answer: A
Mole is the SI unit for measuring the amount of substance.
Q4
Medium
Which of the following units is used to measure the amount of substance in the SI system?
A. Mole
B. Kilogram
C. Liter
D. Meter
Show Answer & Explanation
Correct Answer: A
The mole is the SI unit for measuring the quantity of substance, specifically the amount of particles such as atoms or molecules.
Q5
Medium
A length is measured as 25.5 m with an uncertainty of ±0.2 m. What is the absolute error in this measurement?
A. 0.2 m
B. 25.7 m
C. 25.3 m
D. 0.5 m
Show Answer & Explanation
Correct Answer: A
The absolute error is the uncertainty associated with the measurement, which in this case is ±0.2 m.
Q6
Medium
If a force is measured as 10 N with a percentage uncertainty of 5%, what is the absolute uncertainty in the force measurement?
A. 0.5 N
B. 0.2 N
C. 1 N
D. 0.05 N
Show Answer & Explanation
Correct Answer: A
The absolute uncertainty can be calculated by multiplying the measured value by the percentage uncertainty (10 N * 0.05 = 0.5 N).
Q7
Medium
Which of the following is the correct SI unit for measuring pressure?
A. Newton
B. Pascal
C. Joule
D. Bar
Show Answer & Explanation
Correct Answer: B
Pressure is defined as force per unit area, and the SI unit for pressure is the Pascal (Pa), which is equivalent to one Newton per square meter.
Q8
Hard
A cylindrical rod of length 1.5 m and radius 0.02 m is made of a material with a density of 8000 kg/m³. What is its mass in kilograms?
A. 2.01
B. 2.54
C. 3.02
D. 4.00
Show Answer & Explanation
Correct Answer: B
The volume of the cylinder is given by V = πr²h, and mass is calculated by multiplying density and volume.
Q9
Hard
The speed of light in vacuum is approximately 3.00 × 10^8 m/s. What is this speed expressed in kilometers per second?
A. 300000
B. 3×10^5
C. 3×10^6
D. 30×10^7
Show Answer & Explanation
Correct Answer: B
To convert meters per second to kilometers per second, divide by 1000.
Q10
Hard
If the gravitational constant G is expressed in SI units as 6.674 × 10^-11 N m²/kg², what is the unit of G in terms of base SI units?
A. kg m/s²
B. m³/(kg s²)
C. N/(kg m)
D. m²/(kg s)
Show Answer & Explanation
Correct Answer: B
The unit of G can be derived from its definition involving force and mass.

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Units and Measurements — JEE Physics Practice Questions Online

This page contains 1305 practice MCQs for the chapter Units and Measurements in JEE Physics. The questions are organized by difficulty — 285 easy, 578 medium, 442 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 5 topics, giving you comprehensive coverage of the entire chapter.