The magnetic susceptibility does not depend upon the temperature in
|
(a) Ferrite substances |
(b) Ferromagnetic substances |
|
(c) Diamagnetic substances |
(d) Paramagnetic substances |
(c) Diamagnetic substances
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Carbon dating is best suited for determining the age of fossils if their age in years is of the order of
(a) 
|
(b) 
|
(c) 
|
(d) 
|
An arbitrary shaped closed coil is made of a wire of length L and a current I ampere is flowing in it. If the plane of the coil is perpendicular to magnetic field 
, the force on the coil is
|
(a) Zero |
(b) IBL |
(c) 2IBL |
(d) |
The internal resistance of a cell depends on
|
(a) The distance between the plates |
(b) The area of the plates immersed |
|
(c) The concentration of the electrolyte |
(d) All the above |
Assertion : Magnetic flux can produce induced e.m.f.
Reason : Faraday established induced e.m.f. experimentally.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If assertion is false but reason is true. |
Two wires of equal diameters, of resistivities 
and 
and lengths l1 and l2, respectively, are joined in series. The equivalent resistivity of the combination is
|
(a) |
(b) |
(c) 
|
(d) 
|
Sodium has body centred packing. If the distance between two nearest atoms is 3.7 Å, then its lattice parameter is
|
(a) 4.8 Å |
(b) 4.3 Å |
(c) 3.9 Å |
(d) 3.3 Å |
A concave and convex lens have the same focal length of 20 cm and are put into contact to form a lens combination. The combination is used to view an object of 5 cm length kept at 20 cm from the lens combination. As compared to the object, the image will be
|
(a) Magnified and inverted |
|
(b) Reduced and erect |
|
(c) Of the same size as the object and erect |
|
(d) Of the same size as the object but inverted |
In hydrogen atom, if the difference in the energy of the electron in n = 2 and n = 3 orbits is E, the ionization energy of hydrogen atom is
|
(a) 13.2 E |
(b) 7.2 E |
(c) 5.6 E |
(d) 3.2 E |
