1. The basic unit of electric charge is:
(A) Electron
(B) Coulomb
(C) Proton
(D) Neutron
2. The charge on one electron is approximately:
(A) 1.6 × 10⁻¹⁹ C
(B) 3.2 × 10⁻¹⁹ C
(C) 1.6 × 10⁻⁸ C
(D) 3.2 × 10⁻¹⁸ C
3. The material having least resistance is:
(A) Silver
(B) Copper
(C) Aluminum
(D) Iron
4. The device which converts AC into DC is called:
(A) Oscillator
(B) Amplifier
(C) Rectifier
(D) Filter
5. In a semiconductor, the charge carriers are:
(A) Electrons and holes
(B) Only electrons
(C) Only holes
(D) Ions
6. The most commonly used semiconductor material is:
(A) Silicon
(B) Copper
(C) Iron
(D) Silver
7. A diode conducts current in:
(A) No direction
(B) Reverse bias
(C) Both directions
(D) Forward bias
8. The reverse breakdown in a diode occurs due to:
(A) High reverse voltage
(B) High forward current
(C) Temperature drop
(D) Low bias
9. The unit of resistance is:
(A) Ohm
(B) Watt
(C) Volt
(D) Ampere
10. The unit of capacitance is:
(A) Coulomb
(B) Henry
(C) Farad
(D) Ohm
11. The function of a capacitor in an electronic circuit is to:
(A) Store electric charge
(B) Convert energy
(C) Regulate voltage
(D) Amplify signal
12. The color code of a 1 kΩ resistor (±5%) is:
(A) Brown, Black, Orange, Silver
(B) Brown, Black, Red, Gold
(C) Red, Black, Brown, Gold
(D) Yellow, Violet, Red, Gold
13. The transistor is used mainly for:
(A) Induction
(B) Storage
(C) Rectification
(D) Amplification and switching
14. The transistor has how many terminals?
(A) Three
(B) Two
(C) Four
(D) One
15. In a PNP transistor, the majority carriers are:
(A) Holes
(B) Electrons
(C) Both
(D) None
16. The base of a transistor is:
(A) Thick and lightly doped
(B) Thick and heavily doped
(C) Thin and heavily doped
(D) Thin and lightly doped
17. The device which converts DC into AC is called:
(A) Inverter
(B) Rectifier
(C) Filter
(D) Transformer
18. The output of a full-wave rectifier is:
(A) Pure DC
(B) Pulsating DC
(C) AC
(D) Constant voltage
19. A zener diode is used for:
(A) Voltage regulation
(B) Amplification
(C) Switching
(D) Rectification
20. The transistor works in which region as an amplifier?
(A) Breakdown region
(B) Cut-off region
(C) Saturation region
(D) Active region
21. The input impedance of a common-base transistor is:
(A) Low
(B) High
(C) Very high
(D) Medium
22. The output of a NOT gate is:
(A) The inverse of input
(B) Same as input
(C) Double the input
(D) Zero
23. The binary number 1010 equals to decimal:
(A) 8
(B) 12
(C) 10
(D) 14
24. The logic gate which gives output 1 when all inputs are 1 is:
(A) AND gate
(B) OR gate
(C) NAND gate
(D) NOR gate
25. The Boolean expression for an OR gate is:
(A) A + B
(B) A.B
(C) A ⊕ B
(D) A’ + B
26. The most common logic family used today is:
(A) TTL
(B) CMOS
(C) ECL
(D) RTL
27. The term LED stands for:
(A) Light Electric Device
(B) Light Energy Device
(C) Laser Energy Diode
(D) Light Emitting Diode
28. A photodiode works on the principle of:
(A) Light incident changes current
(B) Temperature change
(C) Voltage drop
(D) Sound energy
29. The input to an operational amplifier is:
(A) Constant
(B) Single-ended
(C) Differential
(D) None
30. The gain of an ideal op-amp is:
(A) One
(B) Zero
(C) Infinite
(D) Very low
31. The frequency of DC signal is:
(A) Zero
(B) 50 Hz
(C) 100 Hz
(D) Infinite
32. The function of a filter circuit is to:
(A) Amplify signal
(B) Remove ripples from rectified output
(C) Convert AC to DC
(D) Produce oscillation
33. The device used to generate a repetitive waveform is:
(A) Oscillator
(B) Amplifier
(C) Rectifier
(D) Transformer
34. The component which stores energy in a magnetic field is:
(A) Inductor
(B) Capacitor
(C) Resistor
(D) Transformer
35. The transformer operates on the principle of:
(A) Photoconductivity
(B) Electrolysis
(C) Heating effect
(D) Electromagnetic induction
36. The turn ratio of a step-up transformer is:
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37. The transistor which conducts more current for a small base current is said to have:
(A) High β (beta)
(B) Low β
(C) Constant β
(D) Zero β
38. In an NPN transistor, current flows from:
(A) Base to collector
(B) Emitter to collector
(C) Collector to emitter
(D) Collector to base
39. The main function of a voltage divider bias circuit is to:
(A) Stabilize transistor operation
(B) Increase current
(C) Reduce voltage
(D) Improve gain
40. The device used for measuring current is:
(A) Voltmeter
(B) Ammeter
(C) Ohmmeter
(D) Wattmeter
41. The device used to measure voltage is:
(A) Voltmeter
(B) Ammeter
(C) Wattmeter
(D) Galvanometer
42. The SI unit of power is:
(A) Watt
(B) Volt
(C) Ampere
(D) Joule
43. The transistor works as a switch in which regions?
(A) Breakdown
(B) Active
(C) Cut-off and saturation
(D) Linear
44. The avalanche breakdown occurs in:
(A) Zener diode
(B) LED
(C) Rectifier diode
(D) Transistor
45. The N-type semiconductor is obtained by adding:
(A) Pentavalent impurity
(B) Trivalent impurity
(C) Neutral atom
(D) Magnetic material
46. The P-type semiconductor has:
(A) No holes
(B) Equal electrons and holes
(C) More electrons
(D) More holes than electrons
47. The junction of P-type and N-type semiconductor forms a:
(A) PN junction
(B) Transistor
(C) Resistor
(D) Capacitor
48. The frequency range of audio signals is:
(A) 0 to 10 Hz
(B) 20 Hz to 20 kHz
(C) 100 kHz to 1 MHz
(D) Above 1 MHz
49. The component used for tuning in radios is:
(A) Variable capacitor
(B) Fixed resistor
(C) Inductor
(D) Diode
50. The transistor amplifier output is taken from:
(A) Collector
(B) Base
(C) Emitter
(D) Junction