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

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Question 1 of 12

Physics

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

Diffraction

Polarization

Interference

Refraction

Question 1 of 12

Question 2 of 12

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

Polarization

Interference

Diffraction

Reflection

Question 2 of 12

Question 3 of 12

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

Sound

Supersonics

Ultrasonic

Light

Question 3 of 12

Question 4 of 12

4. 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

Quadrupled

Halved

Unchanged

Doubled

Question 4 of 12

Question 5 of 12

5. 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:

1

1/3

1/6

2/3

Question 5 of 12

Question 6 of 12

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

Refraction

Diffraction

Polarization

Interference

Question 6 of 12

Question 7 of 12

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

Wavelength

Velocity

Amplitude

Frequency

Question 7 of 12

Question 8 of 12

8. 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 ?

2/1

3/2

2/3

½

Question 8 of 12

Question 9 of 12

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

Velocity

Amplitude

Frequency

Wavelength

Question 9 of 12

Question 10 of 12

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

Radio waves, ultraviolet, X-rays

Ultraviolet, infra-red microwaves

Visible radiation, gamma rays, radio waves

Gamma rays, microwave, visible radiation

Question 10 of 12

Question 11 of 12

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

Diffraction of light d

Interference of light

Refraction of light

Reflection of light

Question 11 of 12

Question 12 of 12

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

Speed of light

Frequency

Wave front

Amplitude

Question 12 of 12

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