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Half Book 1

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20
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0
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1

The breakdown strength of air is approximately:

2

Which device is used to detect electric charge?

3

Eardrum is also known as:

4

The refractive index of a medium depends upon:

5

Sound travels fastest in:

6

Acoustic lenses are used to focus:

7

The part of the eye that controls the amount of light entering is:

8

Which state of matter is most compressible?

9

Formula for heat is:

10

Excessive reverberation can be reduced by using:

11

Constructive interference results in:

12

The angle between the incident ray and the normal is called:

13

Which law of reflection states that the angle of incidence is equal to the angle of reflection?

14

Which lens is thicker at the center than at the edges?

15

Interference occurs when:

16

Gravitational lensing provides evidence for:

17

The unit of frequency is:

18

If the volume of gas is reduced, pressure will:

19

In a convex lens, parallel rays of light after refraction meet at:

20

Which surface reflects most heat?

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