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Science

Which of the following is used as a coolant in nuclear reactors?

A balloon filled with helium rises in air as

Citrus fruits belong to the family

If the doors of a refrigerator are left open for a few hours, the room temperature will

Optic fibre are mainly used for which of the following?

The chemical name of table salt is

The scientist who first isolated a virus in pure crystalline form was awarded a Nobel prize for his contribution. Which of the following was this scientist?

Where should an object be placed so that a real and inverted image of the same size is obtained using a convex lens?

Which of the following is used as a lubricant?

A barometer is kept inside a bell jar. Air is slowly pumped out of the jar.