List of practice Questions

Mitotic stages are not observed in

Identify the compound that exhibits tautomerism.

Populations are said to be allopatric when ................

Four children belonging to same parents have the following blood groups A, B, AB and O. Hence the genotypes of the two parents are

The rate of the reaction $ {2 N_2 O_5 -> 4 NO_2 + O_2}$ can be written in three ways: $\frac{-d [N_2 O_5]}{dt} = k [N_2 O_5]$ $\frac{d[NO_2]}{dt} = k' [N_2 O_5]$ $\frac{d[O_2]}{dt} = k" [N_2 O_5]$ The relationship between k and k' and between k and k'' are-

Which one of the following is an intermediate in the reaction of benzene with $CH_3Cl$ in the presence of anhydrous $AlCl_3$?

A neutron, a proton, an electron and an $\alpha$-particle enter a region of uniform magnetic field with the same velocities. The magnetic field is perpendicular and directed into the plane of the paper. The tracks of the particles are labelled in the figure. The electron follows the track

The deflection in a moving coil galvanometer is reduced to half when it is shunted with a $40\, \Omega$ coil. The resistance of the galvanometer is

A particle executing a simple harmonic motion has a period of $6\,sec$. The time taken by the particle to move from the mean position to half the amplitude, starting from the mean position is.

Sky wave propagation is used in

The frequency of an $FM$ transmitter without signal input is called

With reference to the pituitary, which of the following statements is true?

The thermonuclear reaction of hydrogen inside the stars is taking place by a cycle of operations. The particular element which acts as a catalyst is

Increasing order of carbon-carbon bond length for the following is $\underset{(A)}{C_2H_4}\,\, \underset{(B)}{C_2H_2}\,\, \underset{(C)}{C_6H_6}\,\, \underset{(D)}{C_2H_6}$

The following data is obtained during the first order thermal decomposition of $2A_{(g)} \rightarrow B_{(g)} + C_{(s)}$, at constant volume and temperature The rate constant in $min^{-1}$ is

$\alpha$ - maltose consists of

Consider the following gaseous equilibria with equilibrium constants $K_1$ and $K_2$ respectively. $SO_{2(g)} + \frac{1}{2} O_{2(g)} \leftrightharpoons SO_{3(g)}$ $2SO_{3(g)} \leftrightharpoons 2SO_{2(g)} + O_{2(g)}$ The equilibrium constants are related as

A small uncharged metallic sphere is positioned exactly at a point midway between two equal and opposite point charges. If the sphere is slightly displaced towards the positive charge and released then

The freezing point depression constant for water is $-1.86^{\circ} Cm^{-1}$. If $5.00 \,g$ $Na_2SO_4$ is dissolved in $45.0\,g$ $H_2O$, the freezing point is changed by $- 3.82^{\circ} C$. Calculate the Van't Hoff factor for $Na_2SO_4$.

In the following equation, x, t and F represent respectively, displacement, time and force : $F = a+bt + \frac{1}{c+dx} + A \,sin \left(\omega t + \phi\right).$ The dimensional formula for $A?d$ is

The ratio of minimum wavelengths of Lyman and Balmer series will be

With respect to the velocity constant of a reaction, which one of the following statement is not correct?

Consider the following processes : $\Delta H (kJ / mol)$ ½ A → B + 150 3B → 2C + D -125 E + A → 2D +350 For B + D → E + 2C, ΔH will be-

Which of the following is correct option for free expansion of an ideal gas under adiabatic condition ?

The root mean square velocity of the molecules in a sample of helium is $ \frac{5}{7} $ th that of the molecules in a simple of hydrogen. If the temperature of hydrogen sample is $ 0^{\circ} C $ then that of helium sample is about