The decreasing order of bond dissociation energies of $C-C$,$C-H$,and $H-H$ bonds is:

$A$ conducting rod $AC$ of length $4l$ is rotated about a point $O$ in a uniform magnetic field $\vec B$ directed into the paper. $AO = l$ and $OC = 3l$. Then

If $10$ volumes of dihydrogen gas reacts with $5$ volumes of dioxygen gas,how many volumes of water vapour would be produced?

$\operatorname{cosec} 15^{\circ} + \sec 15^{\circ}$ is equal to :

Which valve is located between the right atrium and the right ventricle?

If $\log x : \log y : \log z = (y - z) : (z - x) : (x - y)$,then