Which type of primary xylem is present in the given figure?

Hemp fibers are obtained from which plant?

Which one of the following halogens liberates oxygen,when passed through hot concentrated $KOH$ solution?

Which of the following statements is true for an $N$-type semiconductor?

$A$ simple pendulum of mass $200\, g$ and length $100\, cm$ is moved aside until the string makes an angle of $60^\circ$ with the vertical. The kinetic and potential energies of the bob,when the string is inclined at $30^\circ$ to the vertical,are

Two uniform rods of equal length but different masses are rigidly joined to form an $L$-shaped body,which is then pivoted as shown. If in equilibrium the body is in the shown configuration,the ratio $M/m$ will be: