N-type and P-type Semiconductors Quiz PDF: Questions and Answers - 11

MCQ 51: Which of the following is not a trivalent impurity atom?

1. Boron
2. Indium
3. Gallium
4. Phosphorous

MCQ 52: Emitter current of BJT in case of amplifier circuit is equals to

1. collector current + base current
2. collector current + base current
3. collector current / base current
4. (collector current / base current)+1

MCQ 53: If the gate to source voltage in an n-channel depletion MOSFET is made more negative, drain current

1. will increase
2. will decrease
3. become zero
4. become infinite

MCQ 54: For germanium, mobility of electrons is

1. 1.5
2. 1.66
3. 2.66
4. 3

MCQ 55: Impurity atoms are added to increase number of holes in intrinsic silicon are called

1. bivalent impurities
2. pentavalent impurities
3. trivalent impurities
4. divalent impurities