List of practice Questions

The enthalpy of formation of $NH_3$ is $- 4 6\, kJ \, mol^{-1}$. The enthalpy change for the reaction : $2 NH _{3}(g) \longrightarrow N _{2}(g)+3 H _{2}(g)$ is

The magnetic Lorentz force experienced by a charge q, entering a magnetic field B with a velocity v is

Which of the following prevents the conversion of prothrombin to thrombin in an undamaged blood vessel ?

The foot of the perpendicular from the point $(2, 4)$ upon $x + y = 4$ is

The r.m.s. velocity of molecules of a gas of density $4 \,kg \,m^{-3}$ and pressure $1.2 \times10^{5} Nm^{-2}$ is

The magnifying power of telescope is high if

$1$ mole of photon, each of frequency $2500\,s^{-1},$ would have approximately a total energy of :

Which one of the following is called a carbylamine?

For any complex number $z$, the minimum value of $\left|z\right|+\left|z-1\right|$ is

If angle of incidence is twice the angle of refraction in a medium of refractive index $ \mu $ , then angle of incidence is

The volume of $ 2 \,N\, H_2SO_4 $ solution is $ 0.1 \,dm^3 $ . The volume of its decinormal solution (in $ dm^3 $ ) will be

In the following reaction sequence, Ethyl amine $ \ce{->[HNO_2]} A \ce{->[PCl_5]}B \ce{->[NH_3]} C $ the compound $ 'C' $ is

Copper is a divalent metal. The value of its electrochemical equivalent is $ 3.29 \times 10^{-4}\, g $ . Its atomic mass is

If an electron is revolving around the hydrogen nucleus at a distance of $ 0.1 \,nm $ , what should be its speed ?

A ray of light is incident at polarising angle such that its deviation is $ 24^{\circ} $ , then angle of incidence is

Electric potential of earth is taken zero. No electric field exists on earth surface.

The longest wavelength line in the Lyman series of the hydrogen spectrum is

A $ 2V $ battery, a $ 990 \, \Omega $ resistor and a potentiometer of $ 2m $ length, all are connected in series of the resistance of potentiometer wire is $ 10 \, \Omega $ , then the potential gradient of the potentiometer wire is

$ 0.1\, M $ solution of which of the following has almost unity degree of dissociation ?

Two sources are said to be coherent if they produce waves

An $L C R$ series circuit containing a resistance of $120 \,\Omega$ has angular resonance frequency $4 \times 10^{5} \,rad \,s ^{-1}$. At resonance the voltage across resistance and inductance are $60\, V$ and $40 \,V$ respectively. The values of $L$ and $C$ are

The distance between an object and a divergent lens is $m$ times the focal length of the lens. The linear magnification produced by the lens is

If the charge on a capacitor is increased by $2$ coulomb, the energy stored in it increases by $21\%$. The original charge on the capacitor is

$30\, cc$ of $\frac {M}{3}\, HCl, 20\, cc$ of $\frac {M}{N} HNO_3$ and $40\, cc$ of $\frac {M}{4}$ $NaOH$ solutions are mixed and the volume was made up to $1\, dm^3$. The $pH$ of the resulting solution is

One of the following is not a property of field lines