Basic Electronics MCQ Part-1

Basic Electronics

1. Electronics is that branch if engineering which deals with the application of___________.

a. Generation of small power 

b. Fission of uranium nuclei

c. Electronic devices

d. Production of electronic components

2. An electron device means the device in which the conduction of electrons takes place through_________.

a. Vacuum

b. A semiconductor

c. A gas

d. A gas, semiconductor or vacuum

 

3. Which one of the following is used as an active device in electronic circuits ?

a. Loudspeaker

b. SCR

c. Electric heater

d. Transformer

4. The colour code of a 1 kilo ohm resistance is________.

a. Black, Brown, Red

b. Red, Brown, Brown

c. Brown, Black, Red

d. Black, Black, Red

5. Neutralizing capacitors are normally used in__________.

a. Operational amplifier

b. RF and IF amplifier

c. Video amplifier

d. Audio amplifier

6. Which one of the following has the ability to act as an open circuit for dc and a short circuit for ac of high frequency__________.

a. A resistor

b. A inductor

c. A capacitor

d. None of the above

7. A device having characteristics very close to that of an ideal voltage source is__________.

a. FET

b. Transistor

c. Zener diode

d. Vacuum diode

8. The maximum number of electrons which the valence shall of an atom can have is __________.

a. 2

b. 6

c. 8

d. 18

9. According to free electron theory, electrons in a metal are subjected to_________.

a. Sinusoidal potential

b. Square-wave potential

c. Constant potential

d. Non-sinusoidal potential

10. For thermionic emission________.

a. The work function of the material has no importance

b. A material with low work function is preferable

c. A material with high work function is preferable

11. Thermionic emission is employed in_________.

a. Photo devices

b. Only in  BJTs

c. Vacuum tubes

d. Semiconductor devices

12. A photocell is illuminated by a small bright source placed 1 m away. When the same source of light is placed two metres away, the electrons emitted by the photocathode_______.

a. Are half as numerous 

b. Are one-quarter as numerous 

c. Each carry one quarter of their previous energy

d. Each carry one quarter of their previous moments

13. Which of the following statements is not correct ?

a. Electron emission takes place in vacuum

b. The amount of energy required for the escape of electrons varies with different materials

c. Metals with lower work function will emit electrons at lower temperatures

d. At ordinary temperature, the energy of free electrons in the metal is more than the work function of the metal

 

14. In a vacuum tetrode secondary emission is because of emission of_________.

a. Electron belonging to the second orbit of the atoms of cathode

b. Electrons from the plate due to bombardment of the fast moving electrons emitted from the cathode

c. High velocity electrons from the cathode

d. Electrons from the filament due to heat energy

15. The best vacuum tube for amplification is_________.

a. Diode

b. Triode

c. Tetrode

d. Pentode

 

16. In a crystal lattice, what are the vacancies created by the absence of certain atoms known as ?

a. Crystal defects

b. Pauli defects

c. Schottky defects

d. Hertz defects

17. The bonding forces in compound semiconductors, such as GaAs, arise from_________.

a. Covalent bonding 

b. Ionic bonding

c. Metallic bonding

d. Combination of ionic and covalent bonding

18. Elements can reach a stable atomic structure by__________.

a. Collisions between atoms

b. Losing electrons only

c. Gaining electrons only

d. Losing or gaining or sharing electrons

 

19. Which one of the following materials does not have a covalent bond ?

a. Diamond

b. Silicon

c. Metal 

d. Organic polymers

20. The nature of crystal binding in germanium is________.

a. Covalent

b. Silicon

c. Metal

d. Van der Waal type

21. The covalent bond is formed by________.

a. Removing the electron completely

b. Transfer of electrons between atoms

c. Sharing of electrons between atoms

d. Sharing of variable number of electrons by a variable number of atoms

22. Conduction electrons have more mobility than holes because they_____.

a. Have negative charge

b. Are lighter

c. Need less energy to move them

d. Experience collision loss frequently

23. Which of the following statements is correct ?

a. Copper has partially filled conduction band

b. Energy gap between conduction and valence bands in diamond is smaller than in silicon

c. Diamond has a completely filled conduction band between empty valence band

d. Silicon has a partially filled conduction band and an empty valence band 

24. An atom is said to be ionized when any one of its orbiting electron________.

a. Is completely removed

b. Comes to the ground state

c. Jumps from one orbit to another 

d. Is raised to an higher orbit

25. An electron in the conduction band _________.

a. Is bound to its parent atom

b. Is located near the top of the crystal

c. Has no charge

d. Has a higher energy than an electron in the valence band

 

26. A semiconductor has a__________.

a. Constant temperature coefficient of resistance

b. Positive temperature coefficient of resistance

c. Negative temperature coefficient of resistance

 

Basic Electronics MCQ Part-2

Basic Electronics MCQ Part-3