Physics MCQs for Competitive Examination
Q. 1
Which of the following physical quantities is a scalar quantity?
(A) Weight
(B) Impulse
(C) Young’s Modulus
(D) Acceleration
Answer: (C) Young’s Modulus
Explanation:
Q. 2
Rate of change of momentum is
(A) Area
(B) Pressure
(C) Force
(D) Velocity
Answer: (C) Force
Explanation:
Q. 3
Who discovered the Theory of Relativity?
(A) Albert Einstein
(B) Issac Newton
(C) Michael Faraday
(D) Niels Bohr
Answer: (A) Albert Einstein
Explanation:
Q. 4
Which device is used to measure the depth of the ocean?
(A) Lexometer
(B) Nanometer
(C) Hydrometer
(D) Fathometer
Answer: (D) Fathometer
Explanation:
Q. 5
What is the unit of electric resistance?
(A) Joule
(B) Dynes
(C) Pascal
(D) Ohm
Answer: (C) Ohm
Explanation:
Q. 6
Which of the following is not a vector quantity?
(A) Work
(B) Displacement
(C) Force
(D) Velocity
Answer: (A) Work
Explanation:
Q. 7
What is the unit of relative density?
(A) Kg/m
(B) Kg/m²
(C) Kg/m³
(D) No unti
Answer: (C) Kg/m³
Explanation:
Q. 8
Light travels fastest in
(A) Nitrogen
(B) Air
(C) Vacuum
(D) Steel
Answer: (C) Vacuum
Explanation:
Q. 9
Impulse is equal to
(A) Change in momentum
(B) Change in force
(C) Change in velocity
(D) Change in acceleration
Answer: (A) Change in momentum
Explanation:
Q. 10
Acceleration is
(A) Inversely proportional to force
(B) Inversely proportional to mass
(C) Directly proportional to force
(D) Directly proportional to mass
Answer: (C) Directly proportional to force
Explanation:
Q. 11
Which of the following statement about displacement is false?
(A) It can be positive, negative or zero
(B) Displacement is never greater than Distance
(C) Its SI unit is meter
(D) It is always positive
Answer: (D) It is always positive
Explanation:
Q. 12
Which physical quantity is measured in “Siemens”?
(A) Electric potential
(B) Electrical conductance
(C) Magnetic flux
(D) Refractive index
Answer: (B) Electrical conductance
Explanation;
Q. 13
If a body slides over a surface, the force resisting the motion between them is called
(A) Friction
(B) Centripetal force
(C) Inertia
(D) Centrifugal force
Answer: (A) Friction
Explanation:
Q. 14
What is the SI unit of force?
(A) Pascal
(B) Boyle
(C) Newton
(D) Watt
Answer: (C) Newton
Explanation:
Q. 15
Which device is used to convert the Alternating Current into Direct Current?
(A) Ammeter
(B) Galvanometer
(C) Rectifier
(D) Transformer
Answer: (C) Rectifier
Explanation:
Q. 16
The washing machine works on the principle of
(A) Dialysis
(B) Diffusion
(C) Reverse Osmosis
(D) Centrifugation
Answer: (D) Centrifugation
Explanation:
Q. 17
Energy travels from the Sun to the Earth through
(A) Conduction
(B) Convection
(C) Radiation
(D) Modulation
Answer: (C) Radiation
Explanation:
Q. 18
The material used in Electric Heater is
(A) Tungsten
(B) Nichrome
(C) Brass
(D) Steel
Answer: (B) Nichrome
Explanation:
Q. 19
Anemometer is an instrument used to measure
(A) Velocity
(B) Wind direction
(C) Wind speed
(D) Temperature
Answer: (C) Wind speed
Explanation:
Q. 20
The unit of measure of noise is
(A) Decibel
(B) Hertz
(C) Amplifier
(D) Accoustics
Answer: (A) Decibel
Explanation: