शिक्षाशास्त्र एवं

Which of the following compounds form nitrites with nitrous acid?

An ice block with a piece of lead embedded in it floats in water. If ice melts the water level –

Kindly Study the following questions carefully and choose the right answer.

The frequency range of human hearing is approximately:

Which part of the body is affected by tuberculosis (TB)?

What is the minimum distance one has to stand at from a wall to hear an echo?

The acceleration due to gravity on the surface of the Earth is approximately:

Which organ controls reflex actions?

Necessary element of change in solar energy to electric energy –

`Short-sight' in human eye can be corrected by using proper –