A Carnot engine has an efficiency of $\frac{1}{6}$. When the temperature of sink is reduced by 62 K , its efficiency is doubled. The temperature of the source is
$37^{\circ} \mathrm{C}$
$62^{\circ} \mathrm{C}$
$99^{\circ} \mathrm{C}$
$124^{\circ} \mathrm{C}$
A cell is balanced against 240 cm and 100 cm of potentiometer wire, respectively, when in open circuit and when short-circuited through a resistance of $5 \Omega$. The internal resistance of the cell is
$1.4 \Omega$
$2.4 \Omega$
$7 \Omega$
$9 \Omega$
Two bodies with kinetic energies in the ratio $3: 1$ are moving with equal linear momentum. The ratio of their masses is
$1: 1$
$1: 2$
$1: 3$
$1: 4$
In a circuit shown, if $10 \Omega$ resistor is replaced by $20 \Omega$, then the current drawn from the battery is

10 A
4 A
2 A
8 A
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