Basic Electronics Multiple choice Question with Answers

  Questions

PART 1

1. An electric battery supplies AC current.

1. True
2.  False

2. What device converts light energy to electrical energy?

1. Dynamo
2. Solar cell
3. Light Polarizer
4. Turbine

3. Which device converts electrical energy to light energy?

1. LED
2. LCD
3. LDR
4. None of these

4. What device is used to store electrical energy in an electric field?

1. Generator
2. Battery
3. Capacitor
4. Field-effect transistor

5. The device which converts sound energy to electrical energy?

1. Mic
2. Speaker
3. Amplifier
4. Modulator

6. Which is the instrument used to measure electrical power?

1. Voltmeter
2. Wattmeter
3. Ammeter
4. Galvanometer

7. Electrons are positively charged particles.

1. True
2.  False

8. A good conductor should have low resistance.

1. True
2.  False

9. What is the full form of CRO?

1. Collector-ray oscilloscope
2. Collector-reel oscilloscope
3. Cathode-ray oscilloscope
4. Cathode-ray optics

10. Find the odd one out.

1. Solar Panel
2. Battery
3. DC Generator
4. Incandescent Lamp

  PART 1 – Answers

1 – B

2 – B

3 – A

4 – C

5 – A

6 – B

7 – B

8 – A

9 – C

10 – D

Explanation to selected questions

10. D – Incandescent Lamp: All other devices converts other forms of energies into electrical energy (generates electricity) whereas an incandescent lamp converts electrical energy to light energy.

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PART 2

1. Pick the Odd one out

1. Resistors
2. Capacitors
3. Inductor
4. Transistor

2. The device which converts AC into DC is called?

1. Amplifier
2. Oscillator
3. Rectifier
4. Filter

3. Which one is the main electronic component in a rectifier circuit?

1. Capacitor
2. Diode
3. Light Emitting Diode
4. Resistor

4. How many terminals does a BJT (Bipolar Junction Transistor) have?

1. 3 Terminal
2. 2 Terminal
3. 1 Terminal
4. 4 Terminal

5. According to Ohms Law, the voltage drop across a resistor, V =? ( I – Current, R- Resistance, V – Voltage drop, P – Power)

1. V = I / R
2. V = P/ R
3. V = P * R
4. V = I R

6. Which one is a semiconductor element?

1. Porcelain
2. Silicon
3. Silver
4. Copper

7. What is the unit of electrical resistance?

1. Ampere
2. Volt
3. Ohms
4. Farad

8. Current through a Resistor is directly proportional to its resistance.

1. True
2. False

9. In which circuit the LED will ON?

A.B.

C. D.

10. An inductor stores energy in the form of ___________ .

1. Magnetic field
2. Static electricity
3. Electric field
4. Light field

  PART 2 – Answers

1 – D

2 – C

3 – B

4 – A

5 – D

6 – B

7 – C

8 – B

9 – B

10 – A

Explanation to selected questions

1. D – Transistor: Transistor is an active component, rest are passive components.

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PART 3

1. Amplification factor (β) of a common emitter transistor is? (Ic – Colelctor current, Ib – Base current, Ie – Emitter current)

1. β = Ic/Ib
2. β = Ie/Ib
3. β = Ib/Ic
4. β = Ic/Ie

2. How many depletion layers are there in a transistor ?

1. Four
2. One
3. Three
4. Two

3. Leakage current of a diode __________ with increase in temperature.

1. Remains constant
2. Decreases
3. Increases
4. None of the above

4. The collector of a Transistor is _________ doped.

1. Moderately
2. Heavily
3. Lightly
4. None of these

5. The capacitive reactance is directly proportional to the frequency of the applied AC signal.

1. True
2. False

6. _______ is a device that changes Direct current (DC) to Alternating current (AC).

1. Voltage regulator
2. Rectifier
3. Inverter
4. Filter

7. In a P-N junction diode no mobile charge carriers are present in the _____________.

1. N region
2. P region
3. Depletion region
4. None of these

8. Extrinsic semiconductors are pure semiconductors.

1. True
2. False

9. Silicon controlled rectifier (SCR) is a member of ________________ family.

1. Resistor
2. Transistor
3. Diode
4. Thyristor

10. The ratio of the strength of the desired signal to that of the unwanted interference signal is called as __________.

1. SNR
2. Attenuation
3. Gain
4. Bit Error Rate

  PART 3 – Answers

1 – A

2 – D

3 – C

4 – A

5 – B

6 – C

7 – C

8 – B

9 – D

10 – A

Explanation to selected questions

5.B – False, because capacitive reactance is inversely proportional to the frequency.