Question Paper - Model
Time Allowed: 3 Hours
Instructions:
- The question paper consists of two parts: Part A and Part B.
- Part A contains multiple-choice questions. Each question carries 1 mark.
- Part B contains short-answer questions. Each question carries 5 marks.
- Attempt all questions.
Part A - Multiple Choice Questions (20 Marks)
1. Which of the following is not a type of amplifier?
a) Common-emitter amplifier
b) Common-base amplifier
c) Common-source amplifier
d) Cascaded amplifier
2. The purpose of a capacitor in a filter circuit is to:
a) Block DC signals
b) Pass AC signals
c) Store electrical energy
d) Amplify signals
3. Which of the following is not a type of modulation?
a) Amplitude modulation
b) Frequency modulation
c) Pulse modulation
d) Digital modulation
4. The process by which a radio receiver extracts the original audio signal from a modulated carrier is called:
a) Demodulation
b) Modulation
c) Amplification
d) Filtering
5. The most common type of semiconductor material is:
a) Silicon
b) Germanium
c) Gallium arsenide
d) Indium phosphide
6. The frequency range of visible light is:
a) 300 GHz to 300 THz
b) 30 Hz to 30 kHz
c) 300 kHz to 300 MHz
d) 30 MHz to 30 GHz
7. The unit of capacitance is:
a) Farad
b) Ohm
c) Henry
d) Coulomb
8. The unit of inductance is:
a) Farad
b) Ohm
c) Henry
d) Coulomb
9. The wavelength of a radio wave is inversely proportional to its:
a) Frequency
b) Amplitude
c) Phase
d) Polarization
10. The phenomenon by which a charged particle is deflected by a magnetic field is called:
a) Lorentz force
b) Ampère's law
c) Faraday's law
d) Ohm's law
11. The direction of the magnetic field around a current-carrying wire is determined by:
a) Right-hand rule
b) Left-hand rule
c) Ampère's law
d) Faraday's law
12. The maximum efficiency of a transformer is achieved when:
a) The primary and secondary windings have the same number of turns.
b) The primary and secondary windings have different numbers of turns.
c) The primary and secondary windings are made of the same material.
d) The primary and secondary windings are made of different materials.
13. The output voltage of a full-wave rectifier is:
a) Pulsating DC
b) Pure DC
c) AC
d) Square wave
14. The type of transistor that is commonly used as a switch is:
a) PNP transistor
b) NPN transistor
c) JFET
d) MOSFET
15. The logic gate that implements the OR operation is:
a) AND gate
b) NAND gate
c) NOR gate
d) XOR gate
16. The binary equivalent of the decimal number 10 is:
a) 1010
b) 0110
c) 0001
d) 1111
17. The type of memory that is used to store permanent data is:
a) RAM
b) ROM
c) EEPROM
d) Flash
18. The difference between analog and digital signals is:
a) Analog signals are continuous, while digital signals are discrete.
b) Analog signals are discrete, while digital signals are continuous.
c) Analog signals have a higher bandwidth, while digital signals have a lower bandwidth.
d) Analog signals have a lower bandwidth, while digital signals have a higher bandwidth.
19. The purpose of a microprocessor is to:
a) Store data
b) Process data
c) Retrieve data
d) Delete data
20. The type of computer language that is used to program microprocessors is called:
a) Machine language
b) Assembly language
c) High-level language
d) Natural language
Part B - Short Answer Questions (80 Marks)
1. Explain the principle of operation of a PN junction diode.
2. Describe the differences between a BJT and a FET, and give one example of each type of transistor.
3. Explain the concept of modulation and describe the two main types of modulation.
4. Draw and explain the block diagram of a simple receiver.
5. Explain the concept of resonance in a series RLC circuit and derive the resonant frequency formula.
6. Describe the working of a transformer and explain how it is used to step up or step down voltage.
7. Draw the circuit diagram of a full-wave rectifier and explain its operation.
8. Explain the difference between saturated and unsaturated digital logic and give an example of each.
9. Describe the operation of a flip-flop and explain the two main types of flip-flops.
10. Explain the concept of memory addressing and describe the different types of addressing modes used in microprocessors.
