1. Electronics is the study of flow of:
A) Electrons
B) Protons
C) Neutrons
D) Photons
2. A material whose conductivity lies between conductor and insulator is called:
A) Conductor
B) Semiconductor
C) Insulator
D) Electrolyte
3. Silicon and germanium are examples of:
A) Conductors
B) Insulators
C) Semiconductors
D) Electrolytes
4. The process of adding impurities to a semiconductor is called:
A) Ionization
B) Neutralization
C) Polarization
D) Doping
5. A semiconductor formed by adding pentavalent impurity is called:
A) N-type semiconductor
B) P-type semiconductor
C) Intrinsic semiconductor
D) Neutral semiconductor
6. In N-type semiconductor, majority charge carriers are:
A) Holes
B) Electrons
C) Protons
D) Neutrons
7. A semiconductor formed by adding trivalent impurity is called:
A) Neutral semiconductor
B) Intrinsic semiconductor
C) P-type semiconductor
D) Metallic semiconductor
8. In P-type semiconductor, majority charge carriers are:
A) Electrons
B) Protons
C) Neutrons
D) Holes
9. A PN junction allows current mainly in:
A) One direction
B) Both directions equally
C) Reverse direction only
D) No direction
10. A diode is mainly used as:
A) Amplifier
B) Rectifier
C) Transformer
D) Capacitor
11. A device used to convert AC into DC is called:
A) Amplifier
B) Oscillator
C) Rectifier
D) Motor
12. Forward biasing of diode means:
A) Positive terminal connected to N-side
B) Negative terminal connected to P-side
C) No battery connection
D) Positive terminal connected to P-side
13. In reverse biasing, diode acts like:
A) Insulator
B) Conductor
C) Amplifier
D) Transformer
14. LED stands for:
A) Light Energy Device
B) Light Emitting Diode
C) Low Energy Diode
D) Light Electronic Device
15. LEDs are commonly used in:
A) Heating appliances
B) Water pumps
C) Electronic displays
D) Motors
16. Transistor is mainly used for:
A) Cooling
B) Heating
C) Reflection
D) Amplification
17. A transistor has ______ terminals.
A) Three
B) Two
C) Four
D) One
18. The three terminals of a transistor are:
A) Anode, cathode, gate
B) Emitter, base, collector
C) Source, drain, gate
D) Positive, negative, neutral
19. The transistor acts as an amplifier because it:
A) Reduces current
B) Stores charge
C) Increases signal strength
D) Produces light
20. The smallest unit of digital information is:
A) Bit
B) Byte
C) Kilobyte
D) Megabyte
21. One byte is equal to:
A) 2 bits
B) 4 bits
C) 6 bits
D) 8 bits
22. Digital electronics uses:
A) Continuous signals
B) Binary numbers
C) Analog signals only
D) Magnetic waves
23. Binary system consists of digits:
A) 0 and 1
B) 1 and 2
C) 0 to 9
D) A and B
24. IC stands for:
A) Internal Circuit
B) Input Circuit
C) Integrated Circuit
D) Internal Conductor
25. A diode allows current in:
A) Reverse direction only
B) Both directions equally
C) No direction
D) One direction only
26. The cathode terminal of a diode is connected to:
A) N-type semiconductor
B) P-type semiconductor
C) Metal core
D) Insulator
27. The anode terminal of diode is connected to:
A) N-type semiconductor
B) P-type semiconductor
C) Neutral region
D) Metal plate
28. The process of converting AC into pulsating DC is called:
A) Amplification
B) Modulation
C) Rectification
D) Oscillation
29. Which electronic component emits light when current passes through it?
A) LED
B) Resistor
C) Capacitor
D) Transformer
30. Semiconductor devices are commonly made from:
A) Copper
B) Iron
C) Aluminum
D) Silicon
31. A transistor can be used as a:
A) Heater
B) Switch
C) Lens
D) Mirror
32. The majority charge carriers in P-type semiconductor are:
A) Electrons
B) Protons
C) Holes
D) Neutrons
33. The majority charge carriers in N-type semiconductor are:
A) Electrons
B) Holes
C) Protons
D) Neutrons
34. The central region of transistor is called:
A) Emitter
B) Collector
C) Cathode
D) Base
35. The emitter region of transistor is:
A) Lightly doped
B) Heavily doped
C) Neutral
D) Insulated
36. The collector region of transistor is used to:
A) Emit charge carriers
B) Block current
C) Collect charge carriers
D) Produce light
37. An intrinsic semiconductor is:
A) Pure semiconductor
B) Doped semiconductor
C) Metallic conductor
D) Insulator
38. The conductivity of semiconductor increases with increase in:
A) Resistance
B) Pressure
C) Voltage only
D) Temperature
39. Which device is used to amplify weak signals?
A) Diode
B) Transistor
C) Capacitor
D) Resistor
40. A diode in forward bias has:
A) Low resistance
B) High resistance
C) Infinite resistance
D) Zero current
41. A diode in reverse bias has:
A) Low resistance
B) Medium resistance
C) High resistance
D) Zero voltage
42. The basic purpose of rectifier is to produce:
A) Alternating current
B) Magnetic field
C) Light energy
D) Direct current
43. A transistor made from two P-type and one N-type layers is called:
A) PNP transistor
B) NPN transistor
C) Rectifier
D) Amplifier diode
44. A transistor made from two N-type and one P-type layers is called:
A) PNP transistor
B) NPN transistor
C) LED transistor
D) Rectifier
45. Which device is commonly used in remote controls?
A) Capacitor
B) Transformer
C) Infrared LED
D) Resistor
46. The unit used to represent computer memory is:
A) Byte
B) Volt
C) Ampere
D) Ohm
47. Which of the following is a semiconductor device?
A) Transformer
B) Heater
C) Motor
D) Diode
48. The binary number system is based on powers of:
A) 10
B) 2
C) 8
D) 16
49. Which impurity is added to form P-type semiconductor?
A) Pentavalent impurity
B) Neutral impurity
C) Trivalent impurity
D) Metallic impurity
50. Electronics mainly deals with control of:
A) Electron flow
B) Light rays
C) Sound waves
D) Heat energy