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
$\quad \mathrm{TV}^2 \mathrm{~A}$
$\frac{\mathrm{T}}{\mathrm{V}^2 \mathrm{~A}}$
$\frac{\mathrm{A}}{\mathrm{TV}^2}$
$\frac{\mathrm{V}^2}{\mathrm{AT}}$
The main difference in the working of a step-up transformer and CE amplifier is
the transformer decreases the power whereas the amplifier keeps the power constant.
the transformer increases the power whereas the amplifier decreases the power.
the amplifier increases the power but the transformer can not increase the power.
the amplifier decreases the power but the transformer keeps the power constant.
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