All Free Computer Science and IT MCQs with Answers

31. Which of the following windows do not have start button?

• A. Windows 10
• B. Windows 8
• C. Windows vista
• D. None of these

Explanation: The original Windows 8 removed the traditional Start button from the desktop interface. Windows 8.1 restored it, but the question specifically names Windows 8.

32. Which of the following is/are the logic gate?

• A. AND
• B. OR
• C. NOT
• D. All of these

Explanation: AND, OR, and NOT are all fundamental logic gates used to process binary values. Therefore, the inclusive choice covering all three is correct.

33. From the following who invented Slide Rules?

• A. John Napier
• B. Gottfried Leibnitz
• C. William Oughtred
• D. Blaise Pascal

Explanation: William Oughtred invented the slide rule in the 17th century by applying logarithmic scales to multiplication and division. John Napier developed logarithms, which made the slide rule possible, but did not invent the instrument.

34. CAM Stands for: __________?

• A. Computer Aided Machine
• B. Computer Aided Manufacturing
• C. Computer Automatic Machine
• D. Computer Automatic Manufacturing

Explanation: CAM means Computer-Aided Manufacturing, where computers assist in planning, controlling, or automating manufacturing processes. The word 'Machine' does not form part of the standard expansion.

35. Which of the following is the most powerful computers?

• A. Mainframe Computer
• B. Mini Computers
• C. Micro Computers
• D. Super Computers

Explanation: Supercomputers have the greatest processing speed and computational capacity among the listed categories. Mainframes handle many users and transactions, but they are not generally as powerful for intensive calculations.

36. What computer virus holds the record for being the most widespread computer virus?

• A. I Love You
• B. Nimdad
• C. Melissa
• D. Christmas

Explanation: The ILOVEYOU virus spread globally through email in 2000 and infected millions of computers, making it one of the most widespread viruses recorded. Its deceptive love-letter attachment encouraged users to open it.

37. What is the full form of G-mail?

• A. Gold Mail
• B. Great Mail
• C. Grooming Mail
• D. Google Mail

Explanation: Gmail was originally associated with the name Google Mail, and that name is still used in some countries. The service is commonly branded simply as Gmail.

38. Storage is also known as ________?

• A. Secondary storage
• B. Auxiliary storage
• C. Mass storage
• D. All of above

Explanation: Storage is called secondary, auxiliary, or mass storage because it retains data for long-term use outside the computer's immediate working memory. These terms commonly refer to devices such as hard drives and optical disks.

39. Which element is deficient in milk _________?

• A. Iron
• B. Phosphorus
• C. Sodium
• D. Calcium

Explanation: Milk is relatively deficient in iron, so infants relying heavily on milk may need another source of iron. Milk is well known for providing calcium, which makes calcium the tempting wrong option.

40. The universal format for PACS image storage and transfer is ______?

• A. DICOM
• B. JPEG
• C. BitMap
• D. None of these

Explanation: DICOM, or Digital Imaging and Communications in Medicine, is the standard format and communication protocol for storing and transferring medical images in PACS. JPEG is a general image format and does not provide the full medical-imaging standard.