How does the $pH$ of blood in arteries compare to that in veins?

The cathode of a photoelectric cell is changed such that the work function changes from $W_1$ to $W_2$ $(W_2 > W_1)$. If the current before and after the change are $I_1$ and $I_2$ respectively,with all other conditions remaining unchanged,then (assuming $h\nu > W_2$):

If $\sqrt{9 x^2+6 x+1} < (2-x)$,then:

If a solid sphere is rolling,the ratio of its rotational kinetic energy to the total kinetic energy is given by:

In a potentiometer experiment,the balancing length for a cell is $240 \ cm$. When a resistance of $2 \ \Omega$ is connected in parallel with the cell,the balancing length becomes $120 \ cm$. The internal resistance of the cell is ................. $\Omega$.

The most abundant prokaryotes helpful to humans in making curd from milk and in production of antibiotics are categorised as