semiconductor-electronics--materials-devices-and-simple-circuits Question 5
Question: Q. 7. In Figure,
(a) 1 and 3 both correspond to forward bias of junction.
(b) 3 corresponds to forward bias of junction and 1 corresponds to reverse bias of junction.
(c) 1 corresponds to forward bias and 3 corresponds to reverse bias of junction.
(d) 3 and 1 both correspond to reverse bias of junction.
[NCERT Exemplar]
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Solution:
Ans. Correct option : (b)
Explanation: when
Q. 8. Hole is
(a) an anti-particle of electron.
(b) a vacancy created when an electron leaves a covalent bond.
(c) absence of free electrons.
(d) an artificially created particle.
[NCERT Exemplar] Ans. Correct option : (b)
Explanation: Atoms of semiconductor are binding by covalent bonds between the atoms of same or different type. Due to thermal agitation when an electron leaves its position and become free, then it leaves a vacancy of electron, this vacancy in the bond (covalent) is called hole.
