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Physics

Physics
Which of the following has the highest frequency?

Microwaves
Cosmic rays
X-rays
Radio waves

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Physics
Which one of the following determines the sharpness of image in a camera ?

The focal length of the lens
The exposure time
Size of the camera
The aperture

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Physics
At what temperature (in degree Celsius), the numerical values on Celsius and Fahrenheit scales become equal?

–273
–40
40
273

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Physics
The type of mirror used in automobiles to see the traffic on the rear side is

Convex
Plano-Convex
Concave
Plane

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Physics
In mirrors the back surface is coated with a thin layer of :

Silver
Silver nitrate
Red oxide
Mercury

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Physics
When an electric bulb breaks, there is an explosive sound. That is due to

The chemical reaction between the gases inside the bulb
None of these
The air outside rushing in to fill the vacuum inside the bulb
The compressed gases inside rushing out suddenly

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