BASIC ELECTRONICS
1. For 180 K ohm resistor with 10 %
tolerance, the color
band will be in the
sequence of
a. Brown-grey-yellow-gold
b. Brown-grey-yellow-silver
c. Brown-blue-yellow-silver
d. Brown-grey-yellow-gold
Answer: brown-grey-yellow-silver
2. Transistor is
a. A passive component
b. Active component
c. None of these
d. Both a & b
Answer: active component
3. Inductor is
a. Active component
b. Passive component
c. None of these
d. Both a & b
Answer: passive component
4. In electronics the term IC denotes
a. Industrial control
b. Integrated circuits
c. Internal combustion
d. International circuits
Answer: integrated circuits
5. What is the unit of inductance?
a. Joule
b. Farad
c. Henry
d. Watts
Answer: henry
6. Which value is equal to one Pico farad?
a. 106
farad
b. 1012 farad
c. 10−6farad
d. 10−12 farad
Answer: 10−12 farad
7. Which of the following elements comprise of the passive
devices? a. Resistors, capacitors & SCRs
b. Vacuum tubes, SCRs & diodes
c. Transformers, inductors & diodes
d. Transformers, TRIACs & DIACs
Answer: transformers, inductors &diodes
8. Active devices can also be used as …..
a. Amplifiers
b. Choppers
c. Converters
d. Inverters
Answer: amplifiers
9. A CRO is a
a. Cathode ray oscillator
b. Cathode ray oscilloscope
c. Capacitor- resistor oscillator
d. Capacitor- resistor output
Answer: cathode ray oscilloscope
10. There are two main characteristics of a
resistor are …. a. Current & voltage
b. Current & power
c. Resistance & power
d. Resistance & current
Answer: resistance & power
1. The DC current through each diode in a bridge rectifier
equals:
a. The load current
b. Half the DC load current
c. Twice the DC load current
d. One-fourth the DC load current
Answer: the load current
2. In a power supply diagram, which block indicates a smooth
dc output? a. Transformer
b. Filter
c. Rectifier
d. Regulator
Answer: regulator
3. Testing a good diode with an ohmmeter should indicate
a. High resistance when forward or reversebiased
b. Low resistance when forward or reversebiased
c. High resistance when reverse biased & low resistance when forward biased
d. High resistance when forward biased &
low
resistance when reverse biased
Answer: high resistance when reverse biased & low
resistance when forward
biased
4. Shunting the ac component away from the load is the task
of a:
a. Transformer
b. Filter
c. Regulator
d. Rectifier
Answer: filter
5. When used as a voltage regulator, Zener diode is normally
a. Not biased
b. Forward biased
c. Reverse biased
d. None of the above
Answer: reverse biased
6. For a germanium diode, the barrier potential is
a. 0.3 volt
b. 0.3 eV
c. 0.7 volt
d. 0.7 eV
Answer: 0.3 volt
7. The output from an unfiltered half wave or full wave
rectifier is a a. Smooth DC voltage
b. Steady DC voltage
c. Pulsating DC voltage
d. AC voltage
Answer: pulsating DC voltage
8. In the breakdown region, a Zener diode behaves like a
……… source a. Constant voltage
b. Constant current
c. Constant resistance
d. None of the above
Answer: constant voltage
9. A Zener diode has …… breakdown
a. Undefined
b. Zero
c. Sharp
d. None of the above
Answer: sharp
10.The maximum efficiency of a half wave
rectifier is …… a. 40.6 %
b. 81.2 %
c. 50 %
d. 25 %
Answer: 40.6 %
1. In a BJT
a. The base region is sandwiched between emitter &
collector
b. The collector is sandwiched between base & emitter
c. The emitter region is sandwiched between base &
collector
d. None of the above
Answer: the base region is sandwiched between emitter &
collector
2. Amplifiers & oscillators using BJT, operate in ……
region
a. Inverted mode
b. Active….
c. Cut off
d. Saturation
Answer: active
3. The arrow in a transistor terminal represents
a. Emitter
b. Collector
c. Base
d. None of the above
Answer: emitter
4. Transistor is a device which is a
a. Transferring voltage device
b. Current operated one
c. Power operated one
d. Voltage operated one
Answer: current operated one
5. Transistor works as an open switch when emitter junction
is ….. biased & collector
junction is …. biased
a. Forward, forward
b. Reverse, reverse
c. Reverse, forward
d. Forward, reverse
Answer: reverse, reverse
6. When a transistor is in active region the resistance is
between
a. Emitter to collector
b. Base to collector
c. Emitter to base
d. All of the above
Answer: base to collector
7. In a NPN transistor, ………. are the
minority carrier. a. Electron
b. Holes
c. Donor ions
d. Acceptor ions
Answer: holes
8. In a transistor ……..
a. IB=IC+IB
b. IC=IE+IB
c. IE=IC+IB
d. IE=IC-IB
Answer: IE=IC+IB
9. The value of α of a transistor is ……
a. 0
b. 1
c. More than 1
d. Less than 1
Answer: less than 1
10. The value of β of a transistor is ……
a. Between 20 & 500
b. 1
c. Less than 1
d. 0
Answer: between 20 & 500
1. Junction Field Effect Transistor (JFET) contain how many
diodes?
a. 4
b. 3
c. 2
d. 1
Answer: 2
2. A “U” shaped, opposite-polarity material built near a
JFET-channel center
is called the: a. Gate
b. Block
c. Drain
d. Heat sink
Answer: Gate
3. What is the input impedance of a common-gate configured
JFET?
a. Very low
b. Low
c. High
d. Very high
Answer: very low
4. JFET terminal “legs” are connections to the drain, the
gate, & the:
a. Channel
b. Source
c. Substrate
d. Cathode
Answer: source
5. With the E-MOSFET, when gate input voltage is zero, drain
current is: a. Atsaturation
b. Zero
c. IDSS
d. Widening the channel
Answer: zero
6. How will electrons flow through a p-channel JFET?
a. From source to drain
b. From source to gate
c. From drain to gate
d. From drain to source
Answer: from drain to source
7. A JFET is also called …….Transistor
a. Unipolar
b. Bipolar
c. Unijunction
d. None of the above
Answer: unipolar
8. A MOSFET is sometimes called ………JFET
a. Many gate
b. Open gate
c. Insulated gate
d. Shorted gate
Answer: insulated gate
9. The pinch-off voltage of a JFET is about ….
a. 5 V
b. 0.6 V
c. 15 V
d. 25 V
Answer: 5 V
10.The gate voltage in a JFET at which drain current becomes
zero is
called........... voltage a. Saturation
b. Pinch-off
c. Active
d. Cut-off
Answer: pinch-off
1. An electric current is the
(A) flow of electrons.
(B) opposition to electrons.
(C) storage of charge.
(D) ionization of atom.
Answer : A
2. Electric pressure is also called
(A) resistance.
(B) power.
(C) voltage.
(D) energy.
Answer :C
3. Which of the following is best conductor of electricity?
(A) aluminum.
(B) silver.
(C) copper.
(D) gold.
Answer :B
4. The dielectric material used in variable capacitor is
generally
(A) mica.
(B) air.
(C) ceramic.
(D) electrolyte.
Answer :B
5. What does a capacitor store?
(A) Current.
(B) Charge.
(C) Voltage.
(D) Power.
Answer : B
6. Power consumed in a pure inductive circuit is
(A) zero.
(B) less.
(C) high.
(D) infinity.
Answer :A
7. A capacitor block
(A) DC.
(B) AC.
(C) both AC or DC.
(D) none of the above.
Answer :A
8. An inductor blocks
(A) AC.
(B) DC.
(C) both AC or DC.
(D) none of the above.
Answer :A
9. Frequency of direct current is
(A) zero.
(B) unity.
(C) 50 Hz.
(D) infinity.
Answer :A
10. Power factor of direct current is
(A) zero.
(B) lagging.
(C) unity.
(D) leading.
Answer :C
11. The number of cycle per second is called
(A) frequency.
(B) time period.
(C) angular displacement.
(D) angular velocity.
Answer :A
12. An instrument which detects electric current is known as
(A) induction meter.
(B) watt meter.
(C) galvanometer.
(D) none of these.
Answer :C
13. The substances which have a large number of free
electrons and offer
a low resistance are called
(A) insulators.
(B) inductors.
(C) conductors.
(D) semi-conductors.
Answer :C
14. The property of a conductor due to which it passes
current is called
(A) reluctance.
(B) conductance.
(C) admittance.
(D) inductance.
Answer :B
15. Reciprocal of the conductance is called
(A) admittance.
(B) resistance.
(C) reluctance.
(D) reactance.
Answer :B
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