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

Nickel
Chromium
Tungsten
Nichrome

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Physics
It is more difficult to walk on a sandy road than on a concrete road because

sand is soft and concreter is hard.
the friction between sand and feet is more than that between concrete and feet.
the friction between sand and feet is less than that between concrete and feet.
the sand is grainy but concrete is smooth.

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Physics
For an ideal gas, which one of the following statements does not hold true?

The potential energy of the gas molecules is zero
The speed of all gas molecules is same
There is no interactive force between the molecules.
The kinetic energies of all gas molecules are not same

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Physics
Rainbows are produced when sunlight :

Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction and internal reflection.
None of the given statements is correct.
Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction
Incident on raindrops hanging in the atmosphere is dispresed after suffering reflection.

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