A coil of inductance $$300$$ $$mH$$ and resistance $$2\Omega$$ is connected to a source of voltage $$2$$ $$V$$. The current reaches half of its steady state value in

One conducting $$U$$ tube can slide inside another as shown in figure, maintaining electrical contacts between the tubes. The magnetic field $$B$$ is perpendicular to the plane of the figure. If each tube moves towards the other at a constant speed $$v,$$ then the $$emf$$ induced in the circuit in terms of $$B,l$$ and $$v$$ where $$l$$ is the width of each tube, will be

The moment of inertia of a uniform semicircular disc of mass $$M$$ and radius $$r$$ about a line perpendicular to the plane of the disc through the center is

An annular ring with inner and outer radii $$R_1$$ and $$R_2$$ is rolling without slipping with a uniform angular speed. The ratio of the forces experienced by the two particles situated on the inner and outer parts of the ring, {{{F_1}} \over {{F_2}}}\, is

Which one of the following statements is NOT true about the effect of an increase in temperature on the distribution of molecular speeds in a gas?

Reaction of one molecule of HBr with one molecule of 1,3-butadiene at 40oC gives predominantly

Of the five isomeric hexanes, the isomer which can give two monochlorinated compounds is

2 methylbutane on reacting with bromine in the presence of sunlight gives mainly

Which types of isomerism is shown by 2,3-dichlorobutane?

The IUPAC name of the coordination compound K3[Fe(CN)6] is

The oxidation state of Cr in [Cr(NH3)4Cl2]+ is :

Which of the following compounds shows optical isomerism?

The value of the ‘spin only’ magnetic moment for one of the following configurations is 2.84 BM. The correct one is :

Which one of the following cyano complexes would exhibit the lowest value of paramagnetic behaviour? (At. No. Cr = 24, Mn = 25, Fe = 26, Co = 27)

The solubility product of a salt having general formula MX2, in water is: 4 $$\times$$ 10-12 . The concentration of M2+ ions in the aqueous solution of the salt is :

Hydrogen ion concentration in mol / L in a solution of pH = 5.4 will be :

What is the conjugate base of OH-?

Pick out the isoelectronic structure from the following : \eqalign{ & \left( i \right)\,\,\,\,\,\,C{H_3}^ + \cr & \left( {ii} \right)\,\,\,\,{H_3}{O^ + } \cr & \left( {iii} \right)\,\,\,N{H_3} \cr & \left( {iv} \right)\,\,\,\,C{H_3}^ - \cr}

In a multi-electron atom, which of the following orbitals described by the three quantum members will have the same energy in the absence of magnetic and electric fields? (A) n = 1, l = 0, m = 0 (B) n = 2, l = 0, m = 0 (C) n = 2, l = 1, m = 1 (D) n = 3, l = 2, m = 1 (E) n = 3, l = 2, m = 0

Of the following sets which one does NOT contain isoelectronic species?