How many world heritage sites have been protected by

Which part of a plant is responsible for photosynthesis?  

The energy emitted by the Sun is primarily due to what process?

A transistor works as an amplifier only when:

Which of the following gas is used in the manufacture of Vanaspati Ghee? 

Which of the following statement is correct?

I. Magnetite is a natural magnet

II. A freely suspended magnet always aligns in N-S direction

Which law states that energy can neither be created nor destroyed?

Find the force exerted on a body of mass 2 kg moving with an acceleration of 3 m/s².

The Mohs scale is used to measure:

The order of wavelengths for ordinary light is:

The unit of electric power is —