List of practice Questions

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 :
The coupling coefficient of the perfectly coupled coils is :
The covalent nature of $AlCl_3$ can be justified orthe basis of
The correct structure of zwitter ion of sulphanilic acid is
The count rate from $100\, cm^{3}$ of a radioactive liquid is $c$. Some of this liquid is now discarded. The count rate of the remaining liquid is found to be $c/10$ after three half-lives. The volume of the remaining liquid, in $cm^{3}$, is
The correct statement of the law of equipartition of energy is
The correct statement variation of the conductivity of semiconductors like Ge and Si is given by
The correct structure of monomers of buna-$S$ is
The correct relationship between free energy change in a reaction and the corresponding equilibrium constant, $K_c$ is