Explanation:
Majority carrier in a n − type semiconductor are holes. This statement is false.
Since, in n−type semiconductor, the pentavalent impurity atoms donate electrons o the host crystal and the semiconductor doped with donars (pentavalent impurity) is called n − type semiconductor.
Therefore majority carrier in a n−type semiconductor are electrons.
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An electron, a proton, a deuteron and an alpha particle, each having the same speed are in a region of constant magnetic field perpendicular to the direction of the velocities of the particles. The radius of the circular orbits of these particles are respectively Re, Rp, Rd and Ra. It follows that
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(a) |
(b) |
(c) |
(d) |
Assertion : The stars twinkle while the planets do not.
Reason : The stars are much bigger in size than the planets.
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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. |
An e.m.f. of 5 volt is produced by a self inductance, when the current changes at a steady rate from 3 A to 2 A in 1 millisecond. The value of self inductance is
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(a) Zero |
(b) 5 H |
(c) 5000 H |
(d) 5 mH |
For protecting a sensitive equipment from the external magnetic field, it should be
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(a) Placed inside an aluminium cane |
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(b) Placed inside an iron cane |
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(c) Wrapped with insulation around it when passing current through it |
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(d) Surrounded with fine copper sheet |
