(a) holes
(b) electrons
(c) ions
(d) holes and electrons
Q2. Assertion (A): In p-n-p transistor collector current is termed negative.
Reason (R): In p-n-p transistor holes are majority carriers.
(a) Both A and R are true and R is correct explanation of A
(b) Both A and R are true but R is not a correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
Q3. The most commonly used semiconductor material is
(a) silicon
(b) germanium
(c) mixture of silicon and germanium
(d) none of the above
Q4. In which of these is reverse recovery time nearly zero?
(a) Zener diode
(b) Tunnel diode
(c) Schottky diode
(d) PIN diode
Q5. A transistor has a current gain of 0.99 in the CB mode. Its current gain in the CC mode is
(a) 100
(b) 99
(c) 1.01
(d) 0.99
Q6. The amount of photoelectric emission current depends on
(a) frequency of incident radiation
(b) intensity of incident radiation
(c) both frequency and intensity of incident radiation
(d) none of the above
(a) Both A and R are true and R is correct explanation of A
(b) Both A and R are true but R is not a correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
Q8. Voltage series feedback (Also called series-shunt feedback) results in
(a) increase in both I/P and O/P impedances
(b) decrease in both I/P and O/P impedances
(c) increase in I/P impedance and decrease in O/P impedance
(d) decrease in I/P impedance and increase in O/P impedance
Q9. How many free electrons does a p type semiconductor has?
(a) only those produced by thermal energy
(b) only those produced by doping
(c) those produced by doping as well as thermal energy
(d) any of the above
Q10. Which of the following has highest resistivity?
(a) Mica
(b) Paraffin wax
(c) Air
(d) Mineral oil
You may also like to read:
