In a reversible isothermal process,the change in internal energy is ...... .

Enzymes are sensitive to

In which activities other than studies should the energy of boys be utilized?

The following figure shows a logic gate circuit with two inputs $A$ and $B$ and an output $C$. The voltage waveforms of $A$,$B$,and $C$ are as shown in the figure. The logic gate is:

Which one of the following is correct about the stability of the given ions?

$A$ bullet of mass $10 ~g$ is fired horizontally with a velocity $1000 ~ms^{-1}$ from a rifle situated at a height $50 ~m$ above the ground. If the bullet reaches the ground with a velocity $500 ~ms^{-1}$,the work done against air resistance in the trajectory of the bullet is : $(g=10 ~ms^{-2})$ (in $~J$)