Free MCQs & Online Quiz Practice for Exams

Q: When a stationary wave is formed then its frequency is

A) Same as that of the individual waves

B) Twice that of the individual waves

C) Half that of the individual waves

D) √2 that of the individual waves

Q: The fundamental frequency of a closed organ pipe is f. If both the ends are opened then its fundamental frequency will be

A) f

B) 0.5f

C) 2f

D) 4f

Q: If the amplitude of a wave is doubled then its intensity is

A) Doubled

B) Halved

C) Quadrupled

D) One fourth

Q: A sound source is moving towards stationary listener with ¹/₁₀th of the speed of sound. The ratio of apparent to real frequency is

A) 11/10

B) [11/10]²

C) [9/10]²

D) 10/9

Q: The principle of Young's double slits experiment is based on the division of:

A) Amplitude

B) Frequency

C) Velocity

D) Wavelength

Q: Which one of the following properties proves the transverse wave nature of light?

A) Interference

B) Refraction

C) Polarization

D) Diffraction

Q: Coloured fringes observed in soap bubbles are the example of:

A) Diffraction

B) Interference

C) Polarization

D) Reflection

Q: During a sunny day we see the objects in a classroom even when all the electric lights are off, due to:

A) Reflection of light

B) Refraction of light

C) Diffraction of light

D) Interference of light

Q: The principle of Michelson interferometer is based on the division of:

A) Wavefront

B) Amplitude

C) Frequency

D) Speed of light

Q: In the Young's double slit experiment the separation between the slits is halved and the distance between the slits and the screen is doubled. The fringe width is:

A) Halved

B) Unchanged

C) Doubled

D) Quadrupled

Q: Signal from a remote control to the device operated by it travels with the speed of:

A) Sound

B) Light

C) Ultrasonic

D) Supersonics

Q: Light of wavelength λ is incident normally on a diffraction grating for which the slit spacing is equal to 3λ. What is the sine of the angle between the second order maximum and the normal?

A) 1/6

B) 1/3

C) 2/3

D) 1

Q: Which of the following gives three regions of the electromagnetic spectrum in order of increasing wavelength, visible radiation?

A) Radio waves, Ultraviolet, X-rays

B) Gamma rays, Microwaves, Visible radiation

C) Ultraviolet, Infra-red, Microwaves

D) Visible radiation, Gamma rays, Radio waves

Q: Two monochromatic radiations X and Y are incident normally on a diffraction grating. The second order intensity maximum for X coincides with the third order intensity maximum for Y. The ratio λₓ/λᵧ is:

A) 3/2

B) 2/3

C) 1/2

D) 2/1

Q: The tip of a needle does not give a sharp image. It is due to:

A) Polarization

B) Interference

C) Diffraction

D) Refraction

Q: Assume we can change the equilibrium state of a system via two different processes. Assume that the initial and the final state are the same. Which of the quantities ΔU, ΔQ, ΔW, and ΔT must be the same for the two processes?

A) only ΔQ and ΔW

B) only ΔU and ΔT

C) only ΔQ and ΔT

D) only ΔU and ΔW

Q: In any process the maximum amount of mechanical energy that can be converted to heat:

A) Depends upon the amount of friction

B) Depends upon the intake and exhaust temperature

C) Depends upon whether kinetic or potential energy is involved

D) Is 100%

Q: In an isothermal change internal energy:

A) Decreases

B) Increases

C) Becomes zero

D) Remains constant

Q: A thermos bottle containing hot coffee is vigorously shaken. Consider coffee as the system, then its temperature:

A) Increases

B) Decreases below 0°C

C) Remains the same

D) Decreases

Q: Maximum work can be obtained in the process called:

A) Cyclic

B) Isothermal

C) Adiabatic

D) Isochoric