Examination on Basic Technology
Class: JSS 3
Term: Third Term
Time: 1 Hour
Total Marks: 70

SECTION A: OBJECTIVES (40 Marks)
Instruction: Answer all questions.

1. ________ is the process of identifying, locating, and rectifying faults in a system. (a) Installation (b) Maintenance (c) Fault detection (d) Calibration
2. A device that allows current to flow in one direction only is called a ________. (a) resistor (b) capacitor (c) diode (d) inductor
3. The motion of a piston in an internal combustion engine is an example of ________ motion. (a) rotary (b) linear (c) oscillating (d) irregular
4. Which of the following electronic components stores electrical energy in an electric field? (a) Inductor (b) Resistor (c) Transistor (d) Capacitor
5. All of these are types of electronic emission except ________. (a) thermionic emission (b) photoelectric emission (c) magnetic emission (d) field emission
6. Which is NOT an active electronic component? (a) Transistor (b) Diode (c) Integrated Circuit (d) Resistor
7. The main reason for performing regular machine maintenance is to ________. (a) increase power consumption (b) ensure smooth operation (c) complicate fault detection (d) replace all parts prematurely
8. The correct step in troubleshooting a machine fault is to first ________. (a) replace expensive parts (b) observe the symptoms (c) ignore the problem (d) apply more force
9. Which of these is not a common type of machine motion? (a) Rotary (b) Linear (c) Oscillating (d) Colour changing
10. An example of a tool used to measure current without breaking the circuit is a ________. (a) multimeter (b) clamp meter (c) screwdriver (d) hammer
11. ________ motion involves movement along a straight path. (a) Oscillating (b) Rotary (c) Linear (d) Vibratory
12. A multimeter is primarily used to measure ________. (a) only voltage (b) only current (c) voltage, current, and resistance (d) only resistance
13. The emission of electrons from a heated surface is known as ________ emission. (a) photoelectric (b) secondary (c) thermionic (d) field
14. Which of the following is an application of rotary motion? (a) A car’s braking system (b) A bicycle wheel (c) A sliding door (d) A simple pendulum
15. All of these are functions of a resistor in a circuit except ________. (a) limiting current (b) dropping voltage (c) storing charge (d) generating heat
16. Which tool would you use to cut and strip electrical wires? (a) Pliers (b) Screwdriver (c) Wire stripper (d) Multimeter
17. The main function of an inductor in an AC circuit is to ________. (a) amplify signals (b) store energy in a magnetic field (c) block DC current (d) convert AC to DC
18. The correct sequence for effective troubleshooting usually starts with ________. (a) replacing parts randomly (b) gathering information (c) applying maximum power (d) ignoring the manual
19. Which of these is not a type of fault detection tool? (a) Oscilloscope (b) Clamp meter (c) Hammer (d) Multimeter
20. An example of converting rotary motion to linear motion is a ________. (a) simple pulley (b) crank and slider mechanism (c) belt drive (d) gear train
21. ________ emission occurs when light energy dislodges electrons from a material. (a) Thermionic (b) Photoelectric (c) Secondary (d) Field
22. A transistor is an active component because it can ________. (a) only block current (b) amplify and switch signals (c) only store charge (d) resist current flow
23. The mechanism that allows for precise linear movement over a short distance is often achieved using ________. (a) gears (b) slides and slots (c) chains (d) simple levers
24. Which of the following describes reversible rotary motion? (a) A fan spinning continuously (b) A car steering wheel (c) A grinding stone (d) A bicycle pedal
25. All of these are benefits of using Integrated Circuits (ICs) except ________. (a) miniaturization (b) increased reliability (c) higher cost per circuit (d) reduced power consumption
26. Which of these DOES NOT contribute to the efficient operation of a machine? (a) Proper lubrication (b) Balanced design (c) Excessive friction (d) Regular inspections
27. The primary purpose of a diode in a circuit is to ________. (a) amplify current (b) allow current in one direction (c) store voltage (d) resist all current
28. The correct procedure for using an oscilloscope involves ________. (a) connecting it directly to power mains (b) adjusting the time base and voltage scales (c) using it to measure resistance (d) hitting it to get a display
29. Which of these is not a common electronic component? (a) Diode (b) Transistor (c) Capacitor (d) Spanner
30. An example of a machine that uses linear motion for its main operation is a ________. (a) electric fan (b) drilling machine (c) conveyor belt (d) spinning wheel
31. ________ is a general term for fixing a faulty component or system. (a) Diagnosis (b) Repair (c) Inspection (d) Testing
32. The ability of a transistor to act as a switch means it can ________. (a) continuously vary resistance (b) turn a circuit ON or OFF (c) only amplify signals (d) store charge temporarily
33. Secondary emission refers to electrons emitted due to ________. (a) heat (b) light (c) bombardment by other electrons (d) strong electric fields
34. Which of the following tools is specifically designed for visualizing electronic waveforms? (a) Multimeter (b) Clamp meter (c) Oscilloscope (d) Logic probe
35. All of these are factors that can cause machine breakdown except ________. (a) wear and tear (b) lack of lubrication (c) proper maintenance (d) incorrect assembly
36. Which of these DOES NOT represent a function of a lever in motion conversion? (a) Amplifying force (b) Changing direction of motion (c) Storing electrical energy (d) Amplifying distance
37. The main purpose of lubrication in machines is to ________. (a) increase friction (b) prevent corrosion (c) increase wear (d) generate heat
38. The correct way to check for continuity in a circuit is to use a ________. (a) hammer (b) screwdriver (c) multimeter (d) pliers
39. Which of these is not a characteristic of field emission? (a) Occurs under strong electric fields (b) Electrons are pulled from surface (c) Requires high temperature (d) Used in electron microscopes
40. An example of an active electronic device is a ________. (a) resistor (b) capacitor (c) inductor (d) transistor

SECTION B: THEORY (30 Marks)
Instruction: Answer any THREE questions.

1. (a) Define fault detection in the context of engineering systems. (2 marks)
(b) List any three tools commonly used for fault detection and state one specific use for each. (3 marks)
(c) Explain the difference between thermionic emission and photoelectric emission. (3 marks)
(d) Differentiate between an active and a passive electronic component, giving one example of each. (2 marks)

2. (a) What is linear motion? Give two practical examples of linear motion in machines. (2 marks)
(b) Describe how rotary motion can be converted into linear motion, providing one engineering example of such a mechanism. (3 marks)
(c) Identify three common electronic components and briefly state their primary function in a circuit. (3 marks)
(d) Explain the concept of reversible rotary motion and provide an example of a machine or system where it is applied. (2 marks)

3. (a) State two distinct uses for a resistor and two for a capacitor in an electronic circuit. (2 marks)
(b) Explain the significance of Integrated Circuits (ICs) in modern electronic devices, highlighting two key benefits. (3 marks)
(c) Discuss two practical applications of machine motion in everyday engineering systems. (3 marks)
(d) Briefly describe ‘slides and slots’ as a mechanism for achieving precise linear movement. (2 marks)

4. (a) Explain what field emission is and describe one scenario where it occurs. (2 marks)
(b) Outline three general stages involved in the process of troubleshooting a faulty electronic system. (3 marks)
(c) State two fundamental differences between a diode and a transistor. (3 marks)
(d) Give two examples of how levers are used in machines to convert or facilitate motion. (2 marks)

Objective Marking Scheme

Question 1 – ✅ (c) Fault detection
Question 2 – ✅ (c) diode
Question 3 – ✅ (b) linear
Question 4 – ✅ (d) Capacitor
Question 5 – ✅ (c) magnetic emission
Question 6 – ✅ (d) Resistor
Question 7 – ✅ (b) ensure smooth operation
Question 8 – ✅ (b) observe the symptoms
Question 9 – ✅ (d) Colour changing
Question 10 – ✅ (b) clamp meter
Question 11 – ✅ (c) Linear
Question 12 – ✅ (c) voltage, current, and resistance
Question 13 – ✅ (c) thermionic
Question 14 – ✅ (b) A bicycle wheel
Question 15 – ✅ (c) storing charge
Question 16 – ✅ (c) Wire stripper
Question 17 – ✅ (b) store energy in a magnetic field
Question 18 – ✅ (b) gathering information
Question 19 – ✅ (c) Hammer
Question 20 – ✅ (b) crank and slider mechanism
Question 21 – ✅ (b) Photoelectric
Question 22 – ✅ (b) amplify and switch signals
Question 23 – ✅ (b) slides and slots
Question 24 – ✅ (b) A car steering wheel
Question 25 – ✅ (c) higher cost per circuit
Question 26 – ✅ (c) Excessive friction
Question 27 – ✅ (b) allow current in one direction
Question 28 – ✅ (b) adjusting the time base and voltage scales
Question 29 – ✅ (d) Spanner
Question 30 – ✅ (c) conveyor belt
Question 31 – ✅ (b) Repair
Question 32 – ✅ (b) turn a circuit ON or OFF
Question 33 – ✅ (c) bombardment by other electrons
Question 34 – ✅ (c) Oscilloscope
Question 35 – ✅ (c) proper maintenance
Question 36 – ✅ (c) Storing electrical energy
Question 37 – ✅ (b) prevent corrosion
Question 38 – ✅ (c) multimeter
Question 39 – ✅ (c) Requires high temperature
Question 40 – ✅ (d) transistor