The internal resistance of a cell of emf 2 V is 0.1 \( \Omega \). It is connected to an external resistance of 3.9 \( \Omega \). The terminal potential difference across the cell will be

The waves used by artifical satellite for communication purposes are

A double-slit apparatus is immersed in a liquid of refractive index \(\mu=\frac{4}{3}\). It has slit separation of \(10^{-3} m\) and distance between the plane of slits and screen is 133 cm . The slits are illuminated by a parallel beam of light of wavelength 630 nm in air. What is the fringe width?

A long straight conductor carries a current of 304 A. The magnitude of the magnetic field due to the current at a distance of 6 cm from the conductor is

Seven lead accumulators, each of emf 2 V, and internal resistance \( 0.07 \text{ } \Omega \), are connected in series with an external resistance \( 9.51 \text{ } \Omega \). The current in the circuit is

Match List-I with List-II

List-I	List-II
(A) Gyromagnetic ratio	(I) \( 4 \times 10^{-5} \text{ T} \)
(B) Permeability of free space	(II) \( 9.27 \times 10^{-24} \text{ Am}^2 \)
(C) Earth's magnetic field at equator	(III) \( 8.8 \times 10^{10} \text{ C/kg} \)
(D) Bohr magneton	(IV) \( 12.56 \times 10^{-7} \text{ TmA}^{-1} \)

Choose the correct answer from the options given below:

A metal wire under constant potential difference, when heated, shows that the drift velocity of the electron :

Read the following passage carefully and answer the given questions.
The B-lymphocytes produce an army of proteins in response to pathogens. Each antibody molecule has four peptide chains, two small called light chains and two longer called heavy chains. Virus-infected cells secrete proteins called interferons which protect non-infected cells from further viral infection. Symptoms of allergic reactions include sneezing, watery eyes, running nose and difficulty in breathing. The use of drugs like anti-histamine, adrenalin and steroids quickly reduce the symptoms of allergy.
Lymphoid organs are the organs where origin and/or maturation and proliferation of lymphocytes occur. The primary lymphoid organs are bone marrow and thymus. After maturation the lymphocytes migrate to secondary lymphoid organs like spleen, lymph nodes, tonsils, Peyer's patches of small intestine and appendix. Heroin commonly called smack is chemically diacetylmorphine which is a white, odourless, bitter crystalline compound. This is obtained by acetylation of morphine, which is extracted from the latex of poppy plant Papaver somniferum.
Which one of the following organs is not a secondary lymphoid organ in humans?

The intercept made by the plane \(2 x-3 y+5 z+4=0\) on \(z\)-axis is :

If the matrix \(A=\left[\begin{array}{ccc}0 & -3 & x+y \\ 3 & x-2 y & 5 \\ -6 & -5 & 0\end{array}\right]\) is skew-symmetric then values of \(x\) and \(y\) respectively are :

If the area of a triangle with vertices \((-3,0),(3,0)\) and \((0, k)\) is 9 sq. units, then \(k\) equals

Choose the correct statement for the collision theory of chemical reactions

The area (in sq.units) of region bounded by \(y^2=9 x, x=2, x=4\) and the \(x\)-axis in the first quadrant is