List of practice Questions

The wheels are made circular because
The width of the forbidden band is small in the case of
The waves used by artificial satellites for communication is
The weakest interparticle forces are present in
The wavelength of sodium light in glass if it is 589.3 nm in air is (The refractive index of glass is 1.5).
The wavelength of X-rays which gives a diffraction angle, 2 $\theta$, equal to $16.80^{\circ}$ for a first order diffraction for a crystal with interplanar distance 0.200 nm, is (given sin $8.4^{\circ}$ and 0.146)
The wavelengths involved in the spectrum of deuterium $( 1^{D^2 })$ are slightly different from that of hydrogen spectrum, because
The volume of water to be added to 100 $cm^3$ of 0.5 $NH_2SO_4$ to get decinormal concentration is
The volume V and depth x of water in a vessl are connected by the relation $V = 5x - \frac{x^2}{6}$ and the volume of water is increasing , at the rate of $5 \, cm^3/sec$, when x = 2 cm. The rate at which the depth of water is increasing, is
The wave impedance of free space is
The volume of atom in comparison to the volume of nucleus is of the order of
The volume of hydrogen at NTP displaced by that.amount of current which displaced 1 .08 g of Ag(equivalent weight of Ag = 108) will be
The volume of the tetrahedron whose coterminous edges are $ \hat{j}+\hat{k}$, $ \hat{i}+\hat{k}$, $\hat{i}+\hat{j}$ is
The volume of 1.0 g of hydrogen in litres at N.T.P.is
The volume of 1 litre is equal to
The volume of a metal sphere increases by $0.24\%$ when its temperature is raised by $40^{\circ}C$. The coefficient of linear expansion of the metal is
The volume of an air bubble increases by x% as it rises from the bottom of a lake to its surface. If the height of the water barometer is H, the depth of the lake is
The volume occupied by 0.04 g molecule of nitric oxide at 0$^\circ$C and 760 torr is
The voltage drop across a forward biased diode is 0.7 V. In the following circuit, the voltages across the $10\,\Omega$ resistance in series with the diode and $20\,\Omega$ resistance are
The voltage of an A.C. source varies with time according to the equation $V=50\, \sin\,100\pi\,t\,\cos\,100\pi\,t$ . Where 't' is the sec and 'V' is in volts. Then
The velocity-time graph of a body is shown in figure. The displacement covered by the body in 8 s is
The velocity-time graph of a body moving in a straight line shown in the figure. The displacement and distance travelled by the body in 6 s are respectively
The vernier scale of a travelling microscope has $50$ divisions which coincide with $49$ main scale divisions. If each main scale division is $0.5\, mm$, then the least count of the microscope is
The velocity of centre of mass of the system remains constant, if the total external force acting on the system is
The velocity of light in air is $3 \times 10^8 \,m s^{-1}$ and that in water is $2.2 \times 10^8\, m s^{-1}$. The polarising angle of incidence is