Practice Computer Hardware under Computers for LDC with 20 free MCQs in Hindi and English.
LDC — Computer Hardware
20 Questions • Instant results & explanations • Hindi & English
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Question 1 of 20
In a Barcode Reader, what is the specific role of the internal photodiode?
Question 2 of 20
Which of the following describes the fundamental distinction between Primary Storage and Secondary Storage?
Question 3 of 20
What exactly is 'Toner' in the operational context of a Laser Printer?
Question 4 of 20
An employee works in an office continuously entering data from a manuscript into a command-line interface. Which medical risk is most pertinent to this specific hardware usage?
Question 5 of 20
In a standard keyboard, what mechanism completes the electrical circuit when a key is pressed?
Question 6 of 20
Consider the following differences between Plotters and standard Printers:
1. Printers use pixel grids known as raster graphics to form images.
2. Plotters use automated pens to draw continuous vector lines.
3. Plotters are entirely obsolete and have been replaced by standard Dot Matrix printers for CAD designs.
Which of the statements given above is/are correct?
Question 7 of 20
Match List-I (Printer/Output Component) with List-II (Core Output Material):
List-I
a. Laser Printer
b. Inkjet Printer
c. Speakers
d. Plotters
List-II
1. Audible sound waves via electromagnet
2. Dry plastic powder (Toner)
3. Continuous vector lines via mechanical pens
4. Liquid ink droplets
Question 8 of 20
Which crucial hardware process requires the Central Processing Unit to access the Read-Only Memory (ROM) specifically during the initial moments a computer is powered on?
Question 9 of 20
What is the consequence if the 'Control Unit' fails to perform its decoding function during the Processing Phase?
Question 10 of 20
Given below are two statements, one labeled as Assertion (A) and the other as Reason (R).
Assertion (A): In a laser printer, the toner is naturally attracted to the specific image areas drawn on the photosensitive drum.
Reason (R): The drum is initially positively charged, and the toner used is a negatively charged dry plastic powder, causing electrostatic attraction.
Choose the correct option:
Question 11 of 20
What is the primary cause of 'rotational latency', a severe architectural disadvantage inherent to traditional Hard Disk Drives (HDDs)?
Question 12 of 20
Consider the following chronological and functional statements regarding the xerographic process inside a Laser Printer:
1. The photosensitive drum begins with a negative electrical charge.
2. The laser beam precisely draws the electrostatic image on the rotating drum.
3. Heated rollers are utilized at the end to permanently melt and fuse the toner onto the paper.
Which of the statements given above is/are INCORRECT?
Question 13 of 20
Which of the following display technologies successfully resolved the issue of screen flicker, thereby making it highly energy-efficient and significantly better for reducing eye strain compared to older models?
Question 14 of 20
What happens to the paper handling in a Drum Plotter compared to a Flatbed Plotter?
Question 15 of 20
Which process describes the method OCR software uses to successfully identify and extract characters from a captured digital image?
Question 16 of 20
A user is attempting to operate a modern smartphone's touchscreen using a standard non-conductive plastic stylus. Why does the screen fail to register the touch?
Question 17 of 20
According to the detailed phase explanation, which part of the Central Processing Unit assumes the role of an overarching traffic director, ensuring instructions are decoded before they are mathematically calculated?
Question 18 of 20
For producing massive, highly accurate technical drawings and architectural blueprints, which specialized output device relies on automated mechanical pens to draw continuous high-resolution vector lines?
Question 19 of 20
In the structural hierarchy of CPU cache, what defines the specific operational role and placement of Level 3 (L3) Cache?
Question 20 of 20
What entity is ultimately responsible for translating a raw scan code into a readable standard ASCII or Unicode character?
