Is gas given with oxygen to patients for diagnosis of breathing problem?

What happens to the speed of a cycle when it travels on a rough surface?

Curd contains mainly______acid.

In the following is not an example of refraction of light.

If the pH value of a substance is lower than 7, it would be considered as–

Which of the following is the most common kidney stone-forming compound?

Which of the following is false?
Sound waves are _________ waves.

Which cell has double outer membrane?