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
A uniform metal wire has length ' $L$ ', mass ' $M$ ' and area of cross-section ' A '. It is under tension ' $T$ ' and ' $V$ ' is the speed of transverse wave along the wire. The density of the wire is
$\quad \mathrm{TV}^2 \mathrm{~A}$
$\frac{\mathrm{T}}{\mathrm{V}^2 \mathrm{~A}}$
$\frac{\mathrm{A}}{\mathrm{TV}^2}$
$\frac{\mathrm{V}^2}{\mathrm{AT}}$
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