Solution:
In a hydrogen atom, electron revolves around a fixed proton nucleus in circular path. This can be explained by Bohr model. But in case of ionised H-molecule which consists of two protons in nucleus and where protons are separated by a small distance of the order of angstrom, cannot be explained by Bohr model. Hence in this case the ground state the electron would not move in circular orbits, the electrons orbit would go around the protons.
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Assertion : Radioactivity of 
undecayed radioactive nuclei of half life of 50 days is equal to that of 1.2 
number of undecayed nuclei of some other material with half life of 60 days
Reason : Radioactivity is proportional to half-life.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
A transformer is employed to
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(a) Obtain a suitable dc voltage |
(b) Convert dc into ac |
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(c) Obtain a suitable ac voltage |
(d) Convert ac into dc |
A thin equiconvex lens is made of glass of refractive index 1.5 and its focal length is 0.2 m, if it acts as a concave lens of 0.5 m focal length when dipped in a liquid, the refractive index of the liquid is
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(a) |
(b) |
(c) |
(d) |
An object is placed first at infinity and then at 20 cm from the object side focal plane of the convex lens. The two images thus formed are 5 cm apart. The focal length of the lens is
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(a) 5 cm |
(b) 10 cm |
(c) 15 cm |
(d) 20 cm |
If a change in current of 0.01 A in one coil produces a change in magnetic flux of 1.2 
in the other coil, then the mutual inductance of the two coils in henries is
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(a) 0 |
(b) 0.5 |
(c) 1.2 |
(d) 3 |
