Physics – Class 12 Mock Test 7

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Question 1 of 10

1. Which among the following is a portion of a transparent refracting medium bound by one spherical surface and the other plane surface?

Lens

Prism

Concave mirror

Plane mirror

Question 1 of 10

Question 2 of 10

2. Identify the factor is not the same for coherent waves.

Frequency

Amplitude

Phase difference constant

Wavelength in phase with each other

Question 2 of 10

Question 3 of 10

3. Pick out the formula for dispersive power from the following.

Dispersive power = mean deviation + angular deviation

Dispersive power = \(\frac {mean \, deviation}{angular \, dispersion }\)

Dispersive power = \(\frac {angular \, dispersion}{mean \, deviation}\)

Dispersive power = mean deviation * angular dispersion

Question 3 of 10

Question 4 of 10

4. A radio can tune to any station in the frequency range from 2.5 MHz to 15 MHz bands. What is the corresponding wavelength band?

40 m to 140 m

20 m to 120 m

10 m to 110 m

30 m to 130 m

Question 4 of 10

Question 5 of 10

5. What is the SI unit of power of a lens?

Diopter

Unit less

Watts

Joule

Question 5 of 10

Question 6 of 10

6. Find the magnification of the lens if the focal length of the lens is 10 cm and the size of the image is -30 cm.

Question 6 of 10

Question 7 of 10

7. How much intensity of the image is increased if the diameter of the objective of a telescope is doubled?

Four times

Two times

Eight times

Sixteen times

Question 7 of 10

Question 8 of 10

8. On what factor does the normal shift through a refracting medium depend?

Convection

Angle of Prism

Angle of deviation

The thickness of the refracting medium

Question 8 of 10

Question 9 of 10

9. Which of the following causes dispersion?

Reflection

Total internal dispersion

Total internal reflection

Refraction

Question 9 of 10

Question 10 of 10

10. A boy uses spectacles of focal length -50 cm. Name the defect of the vision he is suffering from.

Astigmatism

Hypermetropia

Presbyopia

Myopia

Question 10 of 10