List of practice Questions

Three houses are available in a locality. Three persons apply for the houses. Each applies for one house without consulting others. The probability that all the three apply for the same house, is:
The work functions for metals A, B and C are respectively 1.92 eV, 2.0 eV and 5 eV. According to Einstein's equation the metals which will emit photoelectrons for a radiation of wavelength 4100 $\mathring{A} $ is/are
The velocity of bullet is reduced from $200\, m / s$ to $100\, m / s$ while travelling through a wooden block of thickness of $10\, cm$. The retardation assuming to be uniform, will be :
The value of the "spin only" magnetic moment for one of the following configurations is 2.84 BM. The correct one is :
The Van't Hoff factor $'i'$ accounts for
The time period of a charged particle undergoing a circular motion in a uniform magnetic field is independent of its:
The theory of chemical evolution of life' was proposed by .
The temperature of the system decreases in an
The surface tension of which of the following liquids is maximum?
The sum of the series $1+\frac{1}{4\cdot2!}+\frac{1}{16\cdot 4!}+\frac{1}{64\cdot 6!} + \ldots \infty$ is :
The structure of diborane $(B_2H_6)$ contains :
The $SI$ unit of magnetic flux is
In a simple microscope, if the final image is located at 25 cm from the eye placed close to the lens, then the magnifying power is:
A black body at 200 K is found to exit maximum energy at a wavelength 14 $ \mu m $ . When its temperature is raised to 1000 K, then wavelength at which maximum energy emitted is :
Joule second is the unit of:
The half-life of radium is 1620 years and its atomic weight is 226 kg per kilomol. The number of atoms that will decay from its 1 gm sample per second will be :(Avogadros number $ N=6.023\,\times {{10}^{23}} $ atoms/mol)
The capacity of a condenser is $ 4\times {{10}^{-6}} $ farad and its potential is 100 volts. The energy released on discharging it fully will be:
An electron having charge $ 1.6\,\times {{10}^{-19}}\,C $ and mass $ 9\times {{10}^{-31}}\,kg $ is moving with $ 4\times {{10}^{6}}\,kg $ speed in a magnetic field of $ 2\times {{10}^{-1}} $ tesla in a circular orbit. The force acting on an electron and the radius of circular orbit will be:
If $ {{E}_{1}} $ be the electric field strength of a short dipole at a point on its axial line and $ {{E}_{2}} $ that on the equatorial line at the same distance, then:
The ratio of thermal conductivity of two rods of different material is 5 : 4. The two rods of same area of cross-section and same thermal resistance will have the lengths in the ratio :
The peak value of $AC$ voltage on a $220\, V$ mains is:
The oxidation state of Cr in $[Cr(NH_3)_4Cl_2]^+$ is :
The order of reactivity of the following alcohols towards conc. $ HCl $ is:
The number of cranial nerves in frog and man is:
The normal to the curve $x=a\left(cos\,\theta+\theta\,sin\,\theta \right). y=a\left(sin\,\theta -\theta\,cos\,\theta \right)$ at any point $'\theta'$ is such that :