The number of nodal planes in a $p_x$ orbital is

$A$ diatomic ideal gas is used in a Carnot engine as the working substance. If during the adiabatic expansion part of the cycle the volume of the gas increases from $V$ to $32V$,the efficiency of the engine is

Name the ion responsible for unmasking of active sites for myosin for cross-bridge activity during muscle contraction.

$A$ person speaking normally produces a sound intensity level of $40\, dB$ at a distance of $1\, m$. If the threshold intensity level for reasonable audibility is $20\, dB$,the maximum distance at which he can be heard clearly is ..... $m$.

$\int_0^\pi \frac{1}{1+\sin x} \, dx$ is equal to

Which mixture forms a buffer when dissolved in $1 \, L$ of water?