A. If the ionisation energy of hydrogen atom is 13.6 eV then its ionisation potential is 13.6 V.
B. All the setries of hydrogen spectrum have their respective shortest wavelength line corresponding to n = \(\infty\).
C. Paschen, Brackett and Pfund series all the three series are obtained in UV region.
D. The total energy of an electron is equal to the negative of its kinetic energy in the same orbit.
Choose the most appropriate answer from the options given below:

The current in a wire varies with time according to the relationship; I = (2 + 2 t) A, where t is time in seconds. The charge passing through a cross-section of the wire in the time interval between t = 0 s to t = 4 s is

Two charges of equal magnitude and at distance r exert a force F on each other. If each charge is doubled and the distance between them is halved, then the new force acting on each charge will be

Displacement current goes through the gap between the plates of a capacitor when the charge of the capacitor is

The capacitance of capacitor increases when :
(A) its charge increases
(B) its supply voltage decreases
(C) common area of the plates increases
(D) separation between the plates decreases
Choose the correct answer

The electric field component of an electromagnetic wave in vacuum is \( \vec{E} = 3 \cos(1.8y + 5.4 \times 10^8 t) \, \text{N/C} \), where y is in meter and t is in seconds. The frequency of the wave is (approximately)

The shortest wavelength in the Balmer series of a hydrogen atom is (Given: \(R=1.1 \times 10^7 m^{-1}\) )

Two long and parallel straight wires A and B carrying currents of 10.0 A and 5.0 A in the same direction are separated by a distance of 5.0 cm. Estimate the force on a 10 cm section of wire A.

The value of is \(\left|\begin{array}{cc}x^2-x+1 & x-1 \\ x+1 & x+1\end{array}\right|\) equal to

In an experiment, a student measures the terminal potential difference (\( V \)) of a cell (emf \( E \) and internal resistance \( r \)) as a function of current \( I \) and plots a graph with \( V \) on the y-axis and \( I \) on the x-axis.
The slope of the graph between \( V \) and \( I \) is:

Minimum boiling azeotropes show __________ deviation from Raoult's Law at a specific composition.

The IUPAC name of \(\text{CH}_2\text{ = CH-C(CH}_3\text{) (OH)-CH}_2\text{-OCH}_3\) is :

Read the following passage carefully and answer the given questions.
Immune System in the Body
The human immune system consists of lymphoid organs, tissues, cells and soluble molecules like antibodies. The primary lymphoid organs are bone marrow and thymus where immature lymphocytes differentiate into antigen-sensitive lymphocytes. After maturation the lymphocytes migrate to secondary lymphoid organs like spleen, lymph nodes, tonsils, Peyer's patches of small intestine and appendix. The secondary lymphoid organs provide the sites for interaction of lymphocytes with the antigen, which then proliferate to become effector cells. The bone marrow is the main lymphoid organ where all blood cells including lymphocytes are produced. Each antibody molecule has four peptide chains, two small called light chains and two longer called heavy chains. Hence, an antibody is represented as H2L2. Different types of antibodies are produced in our body. IgA, IgM, IgE, IgG are some of them. Techniques like radiography (use of X-rays), CT (computed tomography) and MRI (magnetic resonance imaging) are very useful to detect cancers of the internal organs.
Which one of the following technique is not useful for the detection of cancers of internal organs?