If $A$ and $B$ are any two sets,then $A \cup (A \cap B)$ is equal to

Two identical capacitors have the same capacitance $C$. One of them is charged to a potential $V_1$ and the other to $V_2$. The negative ends of the capacitors are connected together. When the positive ends are also connected,the decrease in energy of the combined system is

The half-life of radioactive Radon is $3.8 \ days$. The time at the end of which $1/20^{th}$ of the Radon sample will remain undecayed is ............ $days$ (Given $\log_{10}e = 0.4343$)

The resolving limit of a healthy human eye is about:

In mammals,histamine is secreted by .........

Gibberellins can promote seed germination because of their influence on