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Physics

Physics
The density of water is 1 g/cc. This is strictly valid at

25°C
4°C
0°C
100°C

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Physics
An electron and a proton starting from rest get accelerated through potential difference of 100 kV. The final speed of the electron and the proton are Ve and Vp respectively. Which of the following relations is correct?

Ve = Vp
Ve > Vp
Ve < Vp
Cannot be determined

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Physics
The speed of light in air is

8 × 103 m/s
3 × 108 m/s
Infinity
3 × 10–8 m/s

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Physics
The snow on the mountains does not melt all at once when it is heated by the sun because:

It becomes very hard
It has a low specific heat capacity
It has a high latent heat of fusion
It reflects most of the heat from the sun

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Physics
Which of the following metals is used for the manufacture of heating elements provided in electric iron ?

Chromium
Nickel
Nichrome
Tungsten

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Physics
Lux is the SI unit of

intensity of illumination
luminous efficiency
luminous flux
luminous intensity

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