If the ratio of the nuclear radii of two atoms is $2: 3$ then the ratio of their mass numbers is:
$8: 27$
$4:9$
$ 27:8$
$9: 4$
The ratio of the angle of deviation produced by a thin prism, when it is placed in air to the angle of deviation produced when it is immersed in water of refractive index $\frac{4}{3}$ is:
$4: 1$
$8: 9$
$ 9:8$
$1: 4$
A vessel of volume $27 \times 10^4 \mathrm{cc}$, contains a mixture of Hydrogen (molar mass $=2 \mathrm{~g} \mathrm{~mol}^{-1}$ ) and oxygen (molar mass $=32 \mathrm{~g} \mathrm{~mol}^{-1}$ ) gas at standard temperature and pressure. If the mass of hydrogen is 16 g , find the mass of oxygen gas contained in the vessel.
160 g
129.7 g
64 g
72 g
In a uniform electric field $10^6 N C^{-1}$ an electric dipole of length 4 cm is placed with its axis making an angle $60^{\circ}$ with the electric field. If the dipole experiences a torque of $8 \sqrt{3} \mathrm{~N} \mathrm{~m}$.
Find the potential energy of the dipole.
$-8 J$
$ 8 J$
$-16 J$
$16 J$
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