List of practice Questions

Which of the following is an unsaturated acid ?
A point source of light produces an illumination $I$ at a point. When the distance between them is made four times its original value, the intensity at that point becomes
Calculate the current I in the circuit shown
The total number of orbitals in a shell can be given in the form of $n$. The principal quantum number is
Which one of the following is the strongest acid?
A dark pattern on a China dish appears brighter than the rest of the dish, when it is strongly heated and taken to a dark room. This is an illustration of
Evolutionary convergence is characterised by
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
 
Circuit
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