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Physics MCQs | Objective Type Questions SET-27
Q1. Which of the following principle is used to produce low temperatures ?
(a) Superconductivity
(b) Joule Kelvin effect
(c) Thermoelectric effect
(d) Adiabatic demagnetization
Ans. : (d) Adiabatic demagnetization
Q2. A photoelectric cell converts
(a) mechanical energy to electric energy
(b) heat energy to mechanical energy
(c) light energy to chemical energy
(d) light energy to electrical energy
Ans. : (d) light energy to electrical energy
Q3. Two stones of different masses are dropped simultaneously from the top of a building
(a) Smaller stone reaches the ground earlier
(b) Larger stone reaches the ground earlier
(c) Both the stones reach the ground at the same time
(d) None of these
Ans. : (c) Both the stones reach the ground at the same time
Q4. The device used to change the speed of an electric fan is
(a) Amplifier
(b) Regulator
(c) Switch
(d) Rectifier
Ans. : (b) Regulator
Q5. Fog is an example of
(a) Gas dispersed in gas
(b) Liquid dispersed in gas
(c) Solid dispersed in gas
(d) Solid dispersed in liquid
Ans. : (b) Liquid dispersed in gas
Q6. A concave lens always forms an image which is
(a) real and erect
(b) virtual and erect
(c) real and inverted
(d) virtual and inverted
Ans. : (b) virtual and erect
Q7. The modulus of rigidity Is the ratio of
(a) longitudinal stress to longitudinal strain
(b) Volume stress to volume strain
(c) shearing stress to shearing strain
(d) tensile stress to tensile strain
Ans. : (c) shearing stress to shearing strain
Q8. The propagation of sound waves in a gas involves
(a) adiabatic compression and rarefaction
(b) isothermal compression and rarefaction
(c) isochoric compression and rarefaction
(d) isobaric compression and rarefaction
Ans. : (a) adiabatic compression and rarefaction
Q9. Heat transfer horizontally within the atmosphere Is called
(a) Conduction
(b) Convection
(c) Absorption
(d) Advection
Ans. : (d) Advection
Q10. Noise is measured In
(a) Watt
(b) REM
(c) Centigrade
(d) Decibel
Ans. : (d) Decibel
