A solid metallic sphere has a charge +3Q. Concentric with this sphere is a conducting spherical shell having charge -Q. The radius of the sphere is a and that of the spherical shell is b(b > a). What is the electric field at a distance R(a < R < b) from the centre
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(a) |
(b) |
(c) |
(d) |
(c) 
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A proton (mass m and charge +e) and an α - particle (mass 4m and charge +2e) are projected with the same kinetic energy at right angles to the uniform magnetic field. Which one of the following statements will be true
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(a) The α - particle will be bent in a circular path with a small radius that for the proton |
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(b) The radius of the path of the α - particle will be greater than that of the proton |
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(c) The α - particle and the proton will be bent in a circular path with the same radius |
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(d) The α - particle and the proton will go through the field in a straight line |
For the production of characteristic 
X-ray, the electron transition is
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(a) n = 2 to n = 1 |
(b) n = 3 to n = 2 |
(c) n = 3 to n = 1 |
(d) n = 4 to n = 1 |
An example of a diamagnetic substance is
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(a) Aluminium |
(b) Copper |
(c) Iron |
(d) Nickel |
For non-conductors, the energy gap is
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(a) 6 eV |
(b) 1.1 eV |
(c) 0.8 eV |
(d) 0.3 eV |
Fermi level of energy of an intrinsic semiconductor lies
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(a) In the middle of forbidden gap |
(b) Below the middle of forbidden gap |
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(c) Above the middle of forbidden gap |
(d) Outside the forbidden gap |
The reciprocal of resistance is
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(a) Conductance |
(b) Resistivity |
(c) Voltage |
(d) None of the above |
