Computer Fundamentals — Important Questions

Byte → KB → MB → GB → TB

Step 1: A bit is the smallest unit of data (0 or 1). 8 bits = 1 Byte. Step 2: 1 Kilobyte (KB) = 1024 Bytes. Step 3: 1 Megabyte (MB) = 1024 KB. Step 4: 1 Gigabyte (GB) = 1024 MB. Step 5: 1 Terabyte (TB) = 1024 GB. So the correct ascending order is Byte → KB → MB → GB → TB. All other options incorrectly place KB or MB out of order.

The entire page is transmitted to a drum before toner is applied

Step 1: A laser printer works on the principle of a photocopier. Step 2: It uses a laser beam to create an image on a drum, altering its electrical charge wherever the laser hits. Step 3: The key feature is that the entire page's image is formed on the drum before the toner is applied. Step 4: Because it processes and transmits the entire page at once (not character by character or line by line), it is called a 'page printer'. Step 5: Dot matrix prints character by character and ink-jet prints line by line — neither processes an entire page at once like a laser printer.

Cache Memory

Step 1: The CPU processes data at very high speed, but main memory (RAM) is comparatively slower. Step 2: This speed mismatch reduces overall CPU performance. Step 3: To bridge this gap, Cache Memory is placed between CPU and main memory. Step 4: Cache memory has an access time very close to the CPU's processing speed, and it stores frequently used or currently executing programs/data. Step 5: ROM is non-volatile read-only memory, RAM is main memory, and secondary memory is even slower. So Cache Memory is the correct answer.

Assessing objective examinations with multiple choice questions

Step 1: OMR stands for Optical Mark Recognition (also called mark sense reader). Step 2: It works by sensing the presence or absence of a mark, such as a pencil mark in a box or circle. Step 3: This technology is ideal for evaluating objective-type answer sheets where students fill in bubbles or circles for MCQs. Step 4: Bar codes are read by bar code readers, cheques use MICR, and converting printed text uses OCR. Step 5: OMR is specifically and widely used for checking answer sheets of competitive and objective exams. Hence, option C is correct.