List of practice Questions

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 :

The moment of inertia of uniform semicircular disc of mass $M$ and radius $r$ about a line perpendicular to the plane of the disc through the centre is:

The molar freezing point constant for water is $ 1.86{}^\circ C/mole $ . If $342\, g$ of cane sugar $ (C_{12}H_{22}O_{11})$ is dissolved in $1000 \,g$ of water, the solution will freeze at:

The major product obtained on treatment of $CH_3 CH_2 CH(F)CH_3$ with $CH_3 O^- /CH_3 OH$ is

The magnetic moment $(\mu ) $ of a revolving electron around the nucleus varies with principal quantum number $n$ as

The lanthanide contraction is responsible for the fact that:

The oxidation state of $M^{3+}$ after removing three electrons is:

The oil of wintergreen is:

The lightest as is: