WBCS Mains Physics Units & Measurements Questions 2023

Q. Powndal is a unit of

(A) mass
(B) weight
(C) momentum
(D) energy

Correct Answer: (B) weight

Q. What do we see at speedometer of a car?

(A) Average speed
(B) Average velocity
(C) Instantaneous speed
(D) Instantaneous velocity

Correct Answer: (C) Instantaneous speed

Q. X-unit = ?

(A) 10⁻¹⁵ m
(B) 10⁻¹² m
(C) 10⁻¹⁰ m
(D) 10⁻¹³ m

Correct Answer: (C) 10⁻¹⁰ m

Q. Which of the following is a vector quantity?

(A) Current
(B) Current density
(C) Power
(D) Wattless current

Correct Answer: (B) Current density

WBCS Mains Physics Units & Measurements Questions 2022

Q. The pressure gauge required for measuring high pressure of the order of 10⁵ psi is

(A) U-Tube manometer
(B) Bourdon pressure gauge
(C) Mc Cleod gauge
(D) Pirani gauge

Correct Answer: (B) Bourdon pressure gauge

WBCS Mains Physics Units & Measurements Questions 2021

Q. Pascal is a unit of

(A) Air pressure
(B) Density
(C) Viscosity
(D) Distance

Correct Answer: (A) Air pressure

Q. Velocity of wind is measured by

(A) Speedometer
(B) Tachometer
(C) Anemometer
(D) Hygrometer

Correct Answer: (C) Anemometer

Q. The unit of energy in MKS system is

(A) Volt
(B) Erg
(C) Ohm
(D) Joule

Correct Answer: (D) Joule

WBCS Mains Physics Units & Measurements Questions 2020

Q. In terms of basic units of mass (M), length (L) and time (T), dimension of energy is

(A) ML²T⁻¹
(B) MLT
(C) MLT⁻¹
(D) ML²T⁻²

Correct Answer: (D) ML²T⁻²

Q. The unit of density in CGS system is

(A) gm/cm⁴
(B) gm/cm³
(C) gm/cm²
(D) gm/cm

Correct Answer: (B) gm/cm³

Q. Which of the following pairs represent units of the same physical quantity?

(A) Kelvin and Joule
(B) Kelvin and Calorie
(C) Newton and Calorie
(D) Joule and Calorie

Correct Answer: (D) Joule and Calorie

WBCS Mains Physics Units & Measurements Questions 2019

Q. The unit of radioactivity is

(A) Co
(B) Ci
(C) Cr
(D) Cq

Correct Answer: (B) Ci

Q. Which of the following pairs, the two physical quantities have different dimensions?

(A) Planck’s constant and angular momentum
(B) Impulse and linear momentum
(C) Moment of inertia and moment of a force
(D) Energy and torque

Correct Answer: (C) Moment of inertia and moment of a force

Q. Which of these are used to measure optical activity?

(A) Polarimeter
(B) Planometer
(C) Psychrometer
(D) Photometer

Correct Answer: (A) Polarimeter

Q. Which is the cheapest device for measuring flow/discharge rate?

(A) Venturimeter
(B) Pitot tube
(C) Orificemeter
(D) None of the above

Correct Answer: (C) Orificemeter

WBCS Mains Physics Units & Measurements Questions 2018

Q. Electric power has the unit of

(A) Volt
(B) Watt
(C) Coulomb
(D) Ampere

Correct Answer: (B) Watt

Q. The pressure gauge used for measuring very low vacuum of the order of 10⁻⁵ torr is

(A) Bourdon pressure gauge
(B) Hot filament ionization gauge
(C) McLeod gauge
(D) Inclined tube manometer

Correct Answer: (B) Hot filament ionization gauge

WBCS Mains Physics Units & Measurements Questions 2017

Q. Weber is the unit of

(A) Intensity of magnetization
(B) Permeability
(C) Magnetic flux
(D) Magnetic susceptibility

Correct Answer: (C) Magnetic flux

Q. One nanometer is equal to

(A) 10⁻¹⁵ m
(B) 10⁻⁹ m
(C) 10⁻¹⁸ m
(D) 10⁻¹² m

Correct Answer: (B) 10⁻⁹ m

Q. The aspect ratio is the ratio of

(A) x axis : y axis
(B) Sin theta : Cos theta
(C) Length : Width
(D) None of the above

Correct Answer: (C) Length : Width

Q. Diamond has the Moh’s scale hardness number of

(A) 5
(B) 7
(C) 10
(D) 9

Correct Answer: (C) 10

WBCS Mains Physics Units & Measurements Questions 2016

Q. Parsec is a measure of

(A) brightness of heavenly bodies
(B) density of the earth
(C) orbital velocity of the stars
(D) astronomical distance

Correct Answer: (D) astronomical distance

Q. Which of the following is used by the mountaineers and the pilots to measure pressure?

(A) Simple barometer
(B) Fortin’s barometer
(C) Manometer
(D) Aneroid barometer

Correct Answer: (D) Aneroid barometer

Q. The celsius temperature is a / an

(A) relative temperature
(B) absolute temperature
(C) specific temperature
(D) approximate temperature

Correct Answer: (A) relative temperature

Q. REM is a unit of

(A) radiation dosage
(B) binding energy
(C) packing fraction
(D) radioactivity

Correct Answer: (A) radiation dosage

WBCS Mains Physics Units & Measurements Questions 2015

Q. Which one is the unit of radio activity?

(A) Curie
(B) Tesla
(C) Henry
(D) Uranium

Correct Answer: (A) Curie

Q. Electron Volt is the unit of

(A) Potential difference
(B) Charge
(C) Energy
(D) Power

Correct Answer: (C) Energy