Why is difficult to hold one's breath beyond a limit?

What is ferromagnetic substance? Why it cannot be magnetised beyond a certain limit?

Why cooking is difficult at high altitude?

Shreyas went to a garden on a wintry morning. When he came back,he found it difficult to breath and started wheezing.What could be the possible condition and how can he be treated?

State whether the following statements are true or false. Correct the false statements:, Forecasting is difficult for places where climatic changes are slow and of a limited nature.

While experimentation, why do you think it is difficult to assign any effect seen to any single hormone?

Answer the following questions : If the value of g suddenly becomes twice its value , it will become two times more difficult to pull a heavy object along the floor. why ?

If the value of g suddenly becomes twice its value,it will become two time more difficult to pull a heavy object along the floor.Why?

The act of drawing wire beyond elastic limit without rupture is called

When the stress is increased beyond the elastic limit, the length of the wire starts increasing without increasing the force. This point is called