List of practice Questions

In human beings, the eggs are

Which of the following is free-living aerobic and non-photosynthetic nitrogen-fixing bacterium?

Viruses possess

The embryonated egg of Ascaris represents

In an A.C.circuit containing only capacitance, the current

Two waves of intensities $ I $ and $ 4I $ produce interference, the intensity, where they interfere constructively is:

A beam of light is passed through a polaroid and the latter is rotated with the beam of light as axis. The intensity of the emergent light varies between a maximum and minimum. Then the light used is

At $0\, K$ temperature, a $p$ - type semiconductor

Which of the following can give iodometric titration?

The circuit shown in the figure contains two diodes each with a forward resistance of 50 \(\Omega\) and with infinite backward resistance. If the battery voltage is 6 V, the current through the 100 \(\Omega\) resistance (in ampere) is
 

Rate constant of a first order reaction is $ 0.0693\,\,{{\min }^{-1}} $ . If we start with $ 20\,mol\,{{L}^{-1}}, $ it is reduced to $ 2.5\,mol\,{{L}^{-1}} $ in:

Which one of the following compounds has $sp^2-$ hybridisation?

Among $KO_2$, $AlO_2^-$ , $BaO_2$ and $NO_2^+$, unpaired electron is present in

A metal ball of mass 2 kg moving with speed of 36 km/h has a head on collision with a stationary ball of mass 3 kg. If after collision, both the balls move as a single mass, then the loss in K.E. due to collision is

Smoke is an example of:

The equation $\sqrt{x+1}-\sqrt{x-1}=\sqrt{4x-1}$ has

Five dry cells each of e.m.f. 1.5 V and internal resistance $ 1\Omega $ are connected in parallel. The emf of the combination is:

A steady current flows in a metallic conductor of non-uniform cross-section. The quantity/quantities constant along the length of the conductor is/are

Siemens is a unit of

Lowering of vapour pressure is highest for

Azeotropic mixture of $ HCl $ and water has

Vapour pressure of benzene at $30^{\circ} C$ is $121.8\, mm$. when $15\, g$ of a non-volatile solute is dissolved in $250\, g$ of benzene, its vapour pressure is decreased to $120.2\, mm$. The molecular weight of the solute is

Addition of $ HgC{{l}_{2}} $ to $ SnC{{l}_{2}} $ gives a brown black colour which is due to the

A charged hollow sphere does not produce an electric field at any

Which contains both polar and non-polar bonds?