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1

A lens with focal length 0.5 m has power:

2

The unit of frequency is:

3

Which region of Earth is the main source of geothermal heat?

4

Latent heat is the heat required to:

5

Atoms of the same element with different mass numbers are called:

6

Overexposure to ultraviolet radiation may cause

7

Static charges are produced mainly by:

8

Unpleasant and unwanted sound is called:

9

Coefficient of linear expansion depends on:

10

Which device is used to detect radiation?

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