The major product of the following reaction is:

If $\tan \theta + \cot \theta = 2$,then $\sin \theta$ is equal to

The ensheathing of muscles is called:

Which of the following metals releases hydrogen gas upon reaction with cold dilute $HNO_3$?

An athlete completes one round of a circular track of radius $R$ in $40 \ s$. What will be his displacement at the end of $2 \ min \ 20 \ s$?

For a normal eye,the cornea of the eye provides a converging power of $40 \ D$ and the least converging power of the eye lens behind the cornea is $20 \ D$. Using this information,the distance between the retina and the cornea-eye lens can be estimated to be.......... $cm$.