Which of the following pairs of straight lines intersect at right angles?

When an ideal diatomic gas is heated at constant pressure,the fraction of the heat energy supplied which increases the internal energy of the gas is:

$A$ small metal sphere of radius $a$ is falling with a velocity $v$ through a vertical column of a viscous liquid. If the coefficient of viscosity of the liquid is $\eta$,then the sphere encounters an opposing force of

Which of the following is a pair of functional isomers?

Haploids are more suitable for mutation studies than diploids. This is because