A ball falls under gravity from a height of 10 m with an initial downward velocity u . It loses one third of its energy in collision and then rises back to 5 m . The initial velocity u is $\left(\mathrm{g}=10 \mathrm{~ms}^{-2}\right)$
$10 \mathrm{~ms}^{-1}$
$1 \mathrm{~ms}^{-1}$
$7.07 \mathrm{~ms}^{-1}$
$0.707 \mathrm{~ms}^{-1}$

In the given circuit, an ideal voltmeter connected across $6 \Omega$ reads 5 V . The internal resistance $r$ of each cell is:
$0.1 \Omega$
$0.2 \Omega$
$0.5 \Omega$
$0.01 \Omega$
A machine gun fires a bullet of mass m with a velocity of $1000 \mathrm{~m} / \mathrm{min}$. The man holding the gun can exert a force of 200 N on the gun. The product of mass of each bullet and the number of bullets fired in one sec is
24
5
12
6
Four masses each 2 kg are placed at the corners A, B, C, D of a mass less square frame. 40 kg mass is at the centre O of a square frame of side 0.2 m . It is to be rotated about an axis passing through the centre O and perpendicular to the plane of the frame. Calculate the torque in $\mathrm{N}-\mathrm{m}$ required to produce an angular acceleration of $\frac{\pi}{2} \mathrm{rads}^{-2}$.
$\frac{\pi}{25}$
$\frac{\pi}{12.5}$
$\frac{2 \pi}{12.5}$
$\frac{2 \pi}{25}$
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