$A$ piece of semiconductor is connected in series in an electric circuit. On increasing the temperature,the current in the circuit will

The time taken by an object to slide down a $45^{\circ}$ rough inclined plane is $n$ times the time it takes to slide down a perfectly smooth $45^{\circ}$ inclined plane. The coefficient of kinetic friction between the object and the inclined plane is:

Give signs used for floral formula.

In the following pairs,the one in which both transition metal ions are colourless is

If a gas is compressed isothermally,then the r.m.s. velocity of the molecules

In the circuit shown in the following figure,the value of $Y$ is