In the given figures,which path is the shortest?

Which are the most primitive types of organisms?

If a copper rod carries a direct current,the magnetic field associated with the current will be

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:

The probability distribution of a random variable $X$ is given by:

$X=x$	$P(X=x)$
$0$	$0.4$
$1$	$0.3$
$2$	$0.1$
$3$	$0.1$
$4$	$0.1$

The variance of $X$ is:

Which of the following substances acts as both an oxidizing agent and a reducing agent?