Suppose there is a hole in a copper plate. On heating the plate,the diameter of the hole would:

Which of the following is generally used for induced mutagenesis in crop plants?

$A$ primary coil and a secondary coil are placed close to each other. $A$ current, which changes at the rate of $25 \, A$ in a millisecond, is present in the primary coil. If the mutual inductance is $92 \times 10^{-6} \, H$, then the value of the induced emf in the secondary coil is:

In plants,what is the function of $CAM$?

$A$ block can slide on a smooth inclined plane of inclination $\theta$ kept on the floor of a lift. When the lift is descending with an acceleration $a$,the acceleration of the block relative to the incline is:

Which of the following has the lowest melting point?