Explanation:
The magnetic susceptibility of diamagnetic materials doesn’t depend upon temperature. This is often because there’s an outsized barrier between the bottom state and therefore the excited states of diamagnetic substances. Hence, it remains constant during the change of temperature. All the other statements are false.
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The electrochemical equivalent of magnesium is 0.126 mg/C. A current of 5 A is passed in a suitable solution for 1 hour. The mass of magnesium deposited will be
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(a) 0.0378 gm |
(b) 0.227 gm |
(c) 0.378 gm |
(d) 2.27 gm |
A one metre long wire is lying at right angles to the magnetic field. A force of 1 kg wt. is acting on it in a magnetic field of 0.98 Tesla. The current flowing in it will be
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(a) 100 A |
(b) 10 A |
(c) 1 A |
(d) Zero |
Assertion : Semiconductors do not Obey's Ohm's law.
Reason : Current is determined by the rate of flow of charge carriers.
|
(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. |
To obtain electrons as majority charge carriers in a semiconductor, the impurity mixed is
|
(a) Monovalent |
(b) Divalent |
(c) Trivalent |
(d) Pentavalent |