List of practice Questions

The depression of freezing point is directly proportional to

The derivative of an even function is always

The density of a metal which crystallises in $bcc$ lattice with unit cell edge length $300\,pm$ and molar mass $50 \,g \,mol^{-1}$ will be

The density of air at N.T.P. is 1.293 gm/lit. If the pressure is tripled keeping its temperature constant its density becomes

The density of core of a planet is $\rho_1$ and that of the outer shell is $\rho_2$. The radii of core and that of the planet are $R$ and $2R$ respectively. Gravitational acceleration at the surface of planet is same as at a depth. The ratio between $\frac{\rho _{1}}{\rho _{2}}$ is

The density of neon will be highest at

The deficiency of this micro nutrient results in ??ittle leaf?

The definition of current gain is given by

The density of a cube is measured by measuring its mass and the length of its side. If the maximum errors in the measurement of mass and length are $4\%$ and $3\%$, respectively, then the maximum error in the measurement of the density is

The de Broglie Wavelength of a molecule of thermal energy KT (K is Boltzmann constant. and T is absolute temperature) is given by

The de Broglie wavelength of a photon is twice the de Broglie wavelength of an electron. The speed of the electron is $v_{e}=\frac{c}{100}$ then

The decay constant of radium is $ 4.28 \times 10^{-4} $ per yr .Its half-life is approximately

The decomposition of a hydrocarbon follows the equation $k=\left(4.5\times10^{11}s^{-1}\right)e^{-28000 K /T}.$ What will be the value of activation energy?

The decomposition of $ {KClO_3}$ to KCl and $ {O_2}$ on heating is an example of

The current passing through a choke coil of 15 henry is decreasing at the rate of 0.2 ampere per second. The e.m.f. developed across the coil :

The curve showing the variation of adsorption with pressure at constant temperature is called

The de-Broglie equation suggests that an electron has

The curie weiss law is obeyed by iron

The current amplification factor $\alpha$ of a common base transistor and the current amplification factor $\beta$ of a common emitter transistor are not related by

The current in $ac$ circuit will be wattless when :

The coxal bone consists of

The critical angle for light going from a medium in which wave length is 4000A$^\circ$ to medium in which its. wavelength is 6000A$^\circ$ is

The critical micelle concentration $(CMC)$ is defined as

The critical temperature of the gas is the temperature

The counting rate observed from a radioactive source at t = 0 seconds was 1600 counts per second and t = 8 seconds it was 100 count per second. The counting rate observed, as counts per second at t = 6 seconds will be :