The sum total of all the chemical reactions occurring in our body is known as

$A$ patient brought to a hospital with myocardial infarction is normally immediately given

Which of the following is known as the $Christmas$ tree?

$A$ circular disc of radius $R$ is removed from a bigger circular disc of radius $2R$ such that the circumferences of the discs touch. The centre of mass of the new disc is at a distance $\alpha R$ from the centre of the bigger disc. The value of $\alpha$ is

If two compounds have the same empirical formula but different molecular formula,they must have:

In order to double the frequency of the fundamental note emitted by a stretched string,the length is reduced to $\frac{3}{4}$ of the original length and the tension is changed. The factor by which the tension is to be changed is