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
$37^{\circ} \mathrm{C}$
$62^{\circ} \mathrm{C}$
$99^{\circ} \mathrm{C}$
$124^{\circ} \mathrm{C}$
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
$1.4 \Omega$
$2.4 \Omega$
$7 \Omega$
$9 \Omega$
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