Physics
Temperature of distant luminous bodies can be determined by

Colour thermometers
Gas thermometers
Mercury thermometers
Pyrometers

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Physics
Solar eclipse will take place when

the earth is between the moon and the sun
the sun is between the moon and the earth
the moon is between the sun and the earth
the moon does not lie on the line joining the sun and the earth

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

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

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