In male cockroaches,sperms are stored in which part of the reproductive system?

$A$ small metal ball is suspended in a uniform electric field with the help of an insulated thread. If a high-energy $X-$ray beam falls on the ball,then the ball

Among the nitrates of alkali metals,which one can be decomposed to its oxide on strong heating?

Carbon,Silicon,and Germanium atoms have four valence electrons each. Their valence and conduction bands are separated by energy band gaps represented by $(E_g)_C$,$(E_g)_{Si}$,and $(E_g)_{Ge}$ respectively. Which one of the following relationships is true in their case?

Chemical $A$ is used for water softening to remove temporary hardness. $A$ reacts with sodium carbonate to produce caustic soda. When $CO_2$ is passed through a solution of $A$,it turns milky. What is the chemical formula of $A$?

In the isoelectronic series of metal carbonyls,the $CO$ bond strength is expected to increase in the order: