Free MCQs & Online Quiz Practice for Exams

Q: A spring-mass system executes SHM. If load is added, the time period will be: (Entry test 2012)

A) increased

B) decreased

C) the same

D) halved

Q: Hooke's law correlates: (Entry test 2012)

A) force & displacement

B) force & extension

C) force & compression

D) stress & strain

Q: Spring constant of a spring is k. If cut into two halves, spring constant of one half is: (Entry test 2012)

A) k+2

B) k/2

C) 2k

D) k

Q: A body vibrates with amplitude x. If displacement is half of amplitude, ratio of total energy to potential energy is: (Entry test 2009)

A) 1:1

B) 1:2

C) 1:4

D) 4:1

Q: A particle moving in a circle with uniform speed has motion that is: (Entry test 2009)

A) periodic & SHM

B) variable

C) periodic but not SHM

D) none of these

Q: If SHM displacement is x = sin(20πt) cm, amplitude is: (Entry test 2015)

A) (5/π)m

B) (5/π)cm

C) 20π cm

D) 100 cm

Q: If absolute temperature of a gas is doubled and pressure is increased four times then its volume becomes (Entry test 2015)

A) Half

B) Double

C) 4 times

D) Unchanged

Q: Which one of the following is of a characteristic of an isothermal change? (Entry test 2010)

A) Enthalpy is constant

B) Temperature is constant

C) Pressure is constant

D) No heat enters or leaves the system

Q: The statement that heat cannot spontaneously flow from a colder to a hotter body is a result of the (Entry test 2014)

A) Henry's law

B) First law of thermodynamics

C) Second law of thermodynamics

D) Third law of thermodynamics

Q: At a constant temperature when the volume of a given mass of a gas is doubled, its density becomes (Entry test 2011)

A) double

B) One fourth

C) Four times

D) Half

Q: The process which is performed quickly is (Entry test 2011)

A) Reversible process

B) Irreversible process

C) Both a and b

D) Neither a nor b

Q: For all irreversible processes, the entropy of the system (Entry test 2011)

A) Decreases

B) Remains constant

C) Is zero

D) Increases

Q: The first law of thermodynamics has a statement which implies that (Entry test 2012)

A) No heat enters or leaves the system

B) The temperature remains constant

C) All work is mechanical

D) Energy is conserved

Q: During a reversible adiabatic expansion of an ideal gas, which of the following is not true (Entry test 2015)

A) P·Vᵞ = constant

B) PV = constant

C) PV = nRT

D) TVᵞ = constant

Q: In isothermal process there is no change in (Entry test 2009)

A) Pressure

B) Work done

C) Internal energy

D) Volume

Q: Ultrasonic waves can be diffracted if the size of the obstacle is about (Entry test 2015)

A) 1 cm

B) 1 m

C) 1 ft

D) 1 µm

Q: Colors of thin film result from (Entry test 2015)

A) Dispersion

B) Interference of light

C) Absorption of light

D) Scattering of light

Q: Traffic signals are red while the eyes are more sensitive to green because (Entry test 2010)

A) Green has less speed

B) Red light has long wavelength

C) Green has less refraction

D) It is made as a rule

Q: A device used for the precise measurement of wavelength is (Entry test 2010)

A) Grating plate

B) Polaroid

C) Prism

D) Michelson interferometer

Q: When light enters from air to glass, it suffers a change in (Entry test 2011)

A) Wavelength

B) Speed

C) Frequency

D) Wavelength & speed