Which of the following plants is known for its hallucinogenic properties?

The number of turns in the primary and secondary coils of a transformer are $50$ and $200$ respectively. If the current in the primary coil is $4 ~A$,then the current in the secondary coil is: (in $~A$)

Which metal does not react with cold water but releases $H_2$ gas upon reacting with steam?

During the electrolysis of copper sulphate aqueous solution using copper electrodes,the reaction taking place at the cathode is:

The type of bonds present in sulphuric anhydride $(SO_3)$ are:

Two particles $A$ and $B$ of masses $m$ and $2m$ are suspended from massless springs of force constants $K_1$ and $K_2$. During their oscillation,if their maximum velocities are equal,then the ratio of amplitudes of $A$ and $B$ is