The $IUPAC$ name of the given compound is:

The coefficient of $x^n$ in $\frac{1-2x}{e^x}$ is:

Which one of the following is commonly used in the transfer of foreign $DNA$ into crop plants?

The length of a magnet is large compared to its width and breadth. The time period of its oscillation in a vibration magnetometer is $2 ~s$. The magnet is cut along its length into three equal parts and three parts are then placed on each other with their like poles together. The time period of this combination will be

Which scientist proposed the theory of continuity of germplasm?

In the circuit shown in the figure,neglecting source resistance,the voltmeter and ammeter readings will respectively be: