Practice Units and MeasurementRRB PYQ questions from Railway examinations, including RRB NTPC PYQ, RRB Group D PYQ, RRB JE PYQ, RRB ALP PYQ and RRB Technician PYQ. This topic-wise Physics question set covers important concepts related to Units and Measurement, helping you revise essential Physics concepts and understand the types of questions asked in RRB examinations.
Each question includes the correct answer and an explanation to help you understand the concept, strengthen your Physics fundamentals, and revise important Heat topics for RRB Railway examinations.
Start practicing Units and MeasurementRRB PYQs and strengthen your Physics preparation
11
In the SI system, which of the following options best describes the fundamental quantities?
RRB ALP (Stage-II); RRB ALP (Stage-I)
2025; 2025
✓ Answer:CLength, mass, time
Length, mass and time are among the seven SI base quantities; pressure, speed, acceleration, force and power are derived quantities.
12
Ampere-second is the unit of.
RRB ALP (Stage-II); RRB J.E.
2025; 2014
✓ Answer:ACharge
Electric charge is Q = It, so ampere × second equals coulomb.
13
What is the SI unit of resistivity?
RRB ALP (Stage-II); RRB Group D
2025; 2022; 2022; 2022; 2018; 2018; 2018
✓ Answer:DOhm-meter
From R = ρL/A, resistivity is ρ = RA/L, giving the SI unit Ω·m.
14
According to the SI system of units, how many fundamental units are used to measure physical quantities?
RRB ALP (Stage-II)
2025
✓ Answer:B7
The SI system has seven base units: metre, kilogram, second, ampere, kelvin, mole and candela.
15
Which of the following is the SI unit of temperature?
RRB Group D; RRB RPF Constable
2018; 2025
✓ Answer:DKelvin
Kelvin is the SI base unit of thermodynamic temperature.
16
Which of the following is the unit used to measure the amount of work done on a body?
RRB ALP (Stage-I); RRB Technicians Grade-III
2024; 2024
✓ Answer:AJoule
Work is measured in joules because W = Fd for force along displacement, and N·m = J.
17
What are the SI units of mass and weight of a body respectively?
RRB Technicians Grade-III
2024
✓ Answer:DKg, Newton
Mass is measured in kilogram, while weight is a force and is measured in newton.
18
The physical quantity having a unit of volt/ampere is
RRB Group D
2022
✓ Answer:DResistance
Volt per ampere is the ohm, the SI unit of electrical resistance.
19
Loudness of sound is measured in
RRB Group D
2018
✓ Answer:CDecibel
Sound level or loudness is commonly expressed in decibels (dB).
20
The SI unit of induced potential difference is
RRB Group D
2022; 2018; 2018
✓ Answer:CV
Induced emf is a potential difference, so its SI unit is volt (V).
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