Which pyrimidine bases are present in $DNA$?

$Assertion\,(A):$ Audio signal of frequency $10 kHz$ cannot be transmitted over long distance without modulation.

$Reason\,(R):$ Length of the antenna required $\lambda /$, should have practical value.

If the angles of a triangle are in the ratio $4:1:1$,then the ratio of the longest side to the perimeter is

If $f(x) = \frac{1}{x^2} \int_3^x (2t - 3f'(t)) dt$,then $f'(3)$ is equal to

What will be the volume of $CO_2$ at $NTP$ obtained on heating $10 \ g$ of ($90\%$ pure) limestone (in $L$)?

If $\sin (y+z-x), \sin (z+x-y)$ and $\sin (x+y-z)$ are in $AP$,then