21. Zener is_______
- a) Diode
- b) IC
- c) Resistance
- d) Condenser
Answer: A - Zener is a special type of diode designed to operate in reverse breakdown region for voltage regulation.
22. ZENER is a_______
- a) COIL
- b) IC
- c) DIODE
- d) None of this
Answer: C - Zener is a diode that allows current to flow forward like a normal diode and also in reverse when voltage exceeds breakdown voltage.
23. What is 1,000p_______
- a) 0.01n
- b) 0.0001u
- c) 0.1n
- d) 1n
Answer: D - 1000pF (picofarads) = 1nF (nanofarad). 1nF = 1000pF.
24. In case of Short Circuit, _______Current will flow in the Circuit.
- a) Zero.
- b) Very Low
- c) Normal.
- d) Infinite
Answer: D - In a short circuit, theoretically infinite current flows as resistance approaches zero (I = V/R).
25. Rectifier converts_______
- a) AC to AC current
- b) DC to AC current
- c) DC to DC current
- d) AC to DC current
Answer: D - A rectifier converts alternating current (AC) to direct current (DC) using diodes.
26. From what location are the 1st computer instructions available on boot up?
- a) ROM BIOS
- b) CPU
- c) boot.ini
- d) CONFIG.SYS
Answer: A - The first computer instructions on boot up come from ROM BIOS (Basic Input Output System).
27. AT SMPS PG stands for_______
- a) Power gone
- b) Power guard
- c) Power good
- d) Power gate
Answer: C - PG (Power Good) is a signal from SMPS indicating that all voltages are stable and within specification.
28. The access time (tacc) of a memory IC is governed by the IC's_______
- a) volatility
- b) internal address decoder
- c) internal address buffer
- d) internal address decoder and volatility
Answer: B - Access time of a memory IC is governed by its internal address decoder which selects the memory location.
29. Which provides the fastest access to large video files?
- a) Optical drives
- b) IDE hard drives
- c) SCSI hard drives
- d) EIDE hard drives
Answer: C - SCSI (Small Computer System Interface) hard drives provide faster access to large video files compared to IDE/EIDE.
30. What is the best ground for a conductive work bench?
- a) AC outlet
- b) Ground to bend
- c) To another device
- d) Chassis ground
Answer: A - AC outlet ground (third pin) is the best ground for a conductive work bench for ESD protection.
31. Which standard govern parallel communications?
- a) RS232
- b) RS-232a
- c) CAT 5
- d) IEEE 1284
Answer: D - IEEE 1284 is the standard that governs parallel communications for printers and other devices.
32. Printer is a input device_______
- a) TRUE
- b) FALSE
- c) N.A.
- d) N.A.
Answer: B - FALSE. A printer is an output device, not an input device (it produces output on paper).
33. We can show OS information from_______
- a) System Properties
- b) Device Manager
- c) BOTH
- d) None of this
Answer: A - OS information (Windows version, processor, RAM) is shown in System Properties (Right-click My Computer → Properties).
34. Voltage is measured_______
- a) in parallel
- b) in series
- c) after breaking the circuit
- d) after checking resistance
Answer: A - Voltage is measured in parallel across a component using a voltmeter/multimeter.
35. ESD would cause the most damage to which component?
- a) Power supply
- b) Expansion board
- c) Monitor
- d) Keyboard
Answer: B - ESD (Electrostatic Discharge) causes the most damage to sensitive expansion boards like RAM, graphics cards, and motherboards.
36. 15 pin connector use for_______
- a) VGA
- b) Printer
- c) Serial Mouse
- d) None of this
Answer: A - A 15-pin D-sub connector (DE-15) is used for VGA (Video Graphics Array) monitors.
37. CRT Monitor EHT voltage are_______
- a) 20kv
- b) 24kv
- c) 30kv
- d) 40kv
Answer: B - CRT Monitor EHT (Extra High Tension) voltage is approximately 24kV (24,000 volts) for the anode.
38. Any number with an exponent of zero is equal to_______
- a) zero
- b) one
- c) that number
- d) ten
Answer: B - Any number (except 0) raised to the power of zero equals 1 (e.g., 5^0 = 1).
39. Since diodes are destroyed by excessive current, circuits must have_______
- a) higher voltage sources
- b) current limiting resistors
- c) more dopants
- d) higher current sources
Answer: B - Circuits must have current limiting resistors in series with diodes to prevent excessive current damage.
40. The voltages in digital electronics are continuously variable_______
- a) TRUE
- b) FALSE
- c) N.A.
- d) N.A.
Answer: B - FALSE. Digital electronics use discrete voltage levels (0 and 1), not continuously variable voltages (that's analog).