A charge of $8 \mu \mathrm{C}$ exists at the centre of the square $A B C D$. The work done in moving a $4 \mu C$ point charge from corner A to corner B is (Along side AB )
4 J
8 J
2 J
zero J
A stone is projected at an angle $60^{\circ}$ to the horizontal. The ratio of kinetic energy of the stone at point of projection to its kinetic energy at highest point of flight will be $\left(\cos 60^{\circ}=0.5\right)$
$1: 4$
$4: 1$
$\quad 2: 1$
$\sqrt{3}: 2$
The loudness and pitch of sound note respectively depend upon
intensity and velocity only.
velocity and frequency only.
frequency and number of harmonics.
intensity and frequency.
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
$37^{\circ} \mathrm{C}$
$62^{\circ} \mathrm{C}$
$99^{\circ} \mathrm{C}$
$124^{\circ} \mathrm{C}$
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