Match List - I with List - II.

List - I (Electromagnetic waves)	List - II (Uses)
(A) Radio waves	(I) Aircraft navigation
(B) Ultraviolet rays	(II) Physical therapy
(C) Infrared waves	(III) Television communication systems
(D) Microwaves	(IV) Kill germs in water purifiers

Choose the correct answer from the options given below :

The energy of the electron in any given state for the hydrogen atom is \( -13.6/n^2 \, \text{eV} \). Identify the correct statements among the following.
(A) The negative sign in \( -13.6 \, \text{eV} \) signifies that the electron is bound to the nucleus.
(B) The negative sign in \( -13.6 \, \text{eV} \) signifies that the electron requires 13.6 eV energy to be separated from the nucleus.
(C) 3.4 eV energy is required to take the electron from the ground to the first excited state.
(D) To find the energy of the third excited state, the value of n is 4.
Choose the correct answer from the options given below:

The magnitude of the magnetic field due to a short bar magnet having a magnetic moment of 0.2 \( \text{Am}^2 \), at a distance of 50 cm from the centre of the magnet on its axial line will be:

In the figure, assuming the diodes to be ideal:

The correct relation between the transistor parameters \(\alpha\) and \(\beta\) is -

Two particles carrying a charge of q = 2 nC each connected by an insulating string are placed r = 1 m apart on a smooth horizontal surface. The tension in the string is

A point source heating device of 1000 W with 10% efficiency is 7m from the observational location. Find the peak value of electric field produced by the radiation at that location.

"Answer the question on basis of passage given below:
\(G = \frac{\kappa A}{l}\) =k(both \(A\) and \(l\) are unity in their appropriate units in m or cm)
Molar conductivity of a solution at a given concentration is the conductance of the volume \(V\) of solution containing one mole of electrolyte kept between two electrodes with area of cross section \(A\) and distance of unit length (\(l\)). Therefore,
\(\Lambda_m = \frac{\kappa A}{l}\)
Since \(l = 1\) and \(A = V\) (volume containing 1 mole of electrolyte),
\(\Lambda_m = \kappa V\)
Calculate \(\Lambda_m\) for aluminium sulphate. When \(\Lambda_m\) for aluminium chloride, sulphuric acid and hydrochloric acid are 236.2, 459.8 and 121.4 S cm\(^2\) mol\(^{-1}\) respectively:"

A mature embryo sac of an angiosperm is:

A ray of light incident at 25° on one refracting surface of a prism of angle 60° suffers a deviation of 50°. What will be the angle of emergence?

The unit digit of \(12^{12}\) is :

The average value of a.c. over a full cycle in an ac circuit is : (Given \( I_0 \) = Peak current)

Which of the following equations represents the Ampere-Maxwell law?