41
When the temperature of an extrinsic semiconductor is increased, the pronounced effect is on……
Answer: Minority carriers
Questions
42
In an intrinsic semiconductor, the number of free electrons ………
Answer: Equals the number of holes
43
At absolute temperature, an intrinsic semiconductor has ……….
Answer: No holes or free electrons
44
At room temperature, an intrinsic silicon crystal acts approximately as ……
Answer: An insulator
45
With forward bias to a pn junction , the width of depletion layer ………
Answer: Decreases
46
At room temperature, an intrinsic semiconductor has ……….
Answer: A few free electrons and holes
49
In a semiconductor, current conduction is due to ……..
Answer: Holes and free electrons
50
The impurity level in an extrinsic semiconductor is about ….. of pure semiconductor.
Answer: 1 atom for 108 atoms
51
Addition of trivalent impurity to a semiconductor creates many ……..
Answer: Holes
53
When a pentavalent impurity is added to a pure semiconductor, it becomes ………
Answer: n-type semiconductor
54
The strength of a semiconductor crystal comes from ……..
Answer: Electron-pair bonds
56
How is charge carriers produced in intrinsic semiconductors?
Answer: By impure atoms
57
Which of the following is known as indirect band gap semiconductors?
Answer: Germanium
58
How is the resistance of semiconductor classified?
Answer: Negative temperature co-efficient
59
Under normal conditions a diode conducts current when it is ……………
Answer: forward biased
60
When a pure semiconductor is heated, its resistance …………..
Answer: Goes down
