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Physics

Physics
A boat will submerge when it displaces water equal to its own:

Surface area
Density
Volume
Weight

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Physics
In an optical fibre the signal is transmitted

Due to refraction
In a curved path
In a straight line path
Due to total internal reflection

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Physics
When the barometer reading dips suddenly, it is an indication of

Dry weather
Storm
Hot weather
Calm weather

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Physics
A parallel-plate capacitor,with air in between the plates, has capacitance C. Now the space between the two plates of the capacitor is filled with a dielectric of dielectric constant 7. Then the value of the capacitance will become

C/7
14C
C
7C

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

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

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Physics
In very cold countries alcohol is used as a thermometric liquid because

It will not stick to the glass tube
Alcohol is a poor conductor of heat
Its freezing point is very low
Alcohol can be coloured for its level to be seen easily

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