Physics Chapter 9 Physical Optics Mcqs Test Online Punjab Class 11th

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Question 1 of 12

Physics

1. Two monochromatic radiating 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.
What is the ratio wavelength X/wavelength Y ?

½

2/1

2/3

3/2

Question 1 of 12

Question 2 of 12

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

Interference

Diffraction

Refraction

Polarization

Question 2 of 12

Question 3 of 12

3. During a sunny day we see the objects in a class room even when all the electric lights are off, due to:

Interference of light

Refraction of light

Reflection of light

Diffraction of light d

Question 3 of 12

Question 4 of 12

4. Which one of the following properties proves the transverse wave nature of light.

Refraction

Interference

Polarization

Diffraction

Question 4 of 12

Question 5 of 12

5. The principle of Young’s double slits experiment is based on the division of:

Wavelength

Velocity

Frequency

Amplitude

Question 5 of 12

Question 6 of 12

6. The principle of Michelson interferometer is based on the division of

Amplitude

Speed of light

Wave front

Frequency

Question 6 of 12

Question 7 of 12

7. In the Young’s double slit experiment the separation between the slits is halved and the distance between the slits and the screen is double. The fringe width is

Doubled

Quadrupled

Halved

Unchanged

Question 7 of 12

Question 8 of 12

8. Which of the following three regions of the electromagnetic spectrum in order of increasing wavelength, visible radiation.

Visible radiation, gamma rays, radio waves

Radio waves, ultraviolet, X-rays

Gamma rays, microwave, visible radiation

Ultraviolet, infra-red microwaves

Question 8 of 12

Question 9 of 12

9. Coloured fringes observed in soap bubbles are the examples of

Polarization

Reflection

Diffraction

Interference

Question 9 of 12

Question 10 of 12

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

Ultrasonic

Light

Sound

Supersonics

Question 10 of 12

Question 11 of 12

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

2/3

1

1/3

1/6

Question 11 of 12

Question 12 of 12

12. Which one of the following properties of light does not change when it enters from one medium to another medium?

Frequency

Velocity

Amplitude

Wavelength

Question 12 of 12

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