1. The decimal number 5 is represented in binary as
Answer: B. 101
Computer Science Class 10 Unit 1: Computer Systems MCQs
76 multiple choice questions with the correct answer for each. Tap an option to check yourself, or switch on "Show all answers". This is page 1 of 2.
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2. The ASCII code of the letter 'A' is
Answer: C. 65 (01000001)
3. The ASCII code of 'Z' (90 in decimal) in binary is
Answer: D. 01011010
4. An 8-bit unsigned integer can represent values from
Answer: A. 0 to 255
5. In an 8-bit signed integer representation, the range of values is
Answer: C. -128 to 127
6. The number of different values that can be represented with a 10-bit binary number is
Answer: B. 1024
7. The base of the binary number system is
Answer: A. 2
8. The base of the hexadecimal number system is
Answer: D. 16
9. The hexadecimal number system uses digits
Answer: A. 0–9 and letters A–F
10. The decimal equivalent of binary (1011.101)₂ is
Answer: B. 11.625
11. The decimal equivalent of octal (672)₈ is
Answer: D. 442
12. The decimal equivalent of hexadecimal (1BE8)₁₆ is
Answer: C. 7144
13. The binary equivalent of decimal 179 (integer part) is
Answer: D. 10110011
14. Each octal digit is converted to ______ binary bits.
Answer: A. 3
15. Each hexadecimal digit is converted to ______ binary bits.
Answer: C. 4
16. To convert binary to hexadecimal, group the bits in
Answer: B. fours from the right
17. To convert binary to octal, group the bits in
Answer: D. threes from the right
18. In binary addition, 1 + 1 equals
Answer: B. 10 (0 carry 1)
19. Overflow happens when a calculation result is
Answer: C. too large to fit in the available bits
20. Adding 1 to 255 in an 8-bit unsigned register causes
Answer: A. overflow
21. The 1's complement of a binary number is obtained by
Answer: D. inverting all its bits
22. The 1's complement of binary 01101 is
Answer: A. 10010
23. The 2's complement of a binary number is obtained by taking the 1's complement and then
Answer: C. adding 1 to the LSB
24. The 2's complement of 01010001 is
Answer: B. 10101111
25. The range of an n-bit unsigned binary number is
Answer: B. 0 to 2ⁿ − 1
26. The most common method to represent signed numbers in modern computers is
Answer: D. two's complement
27. The 8-bit two's complement representation of −43 is
Answer: C. 11010101
28. ASCII stands for
Answer: A. American Standard Code for Information Interchange
29. Standard ASCII uses ______ bits and represents 128 characters.
Answer: B. 7
30. Extended ASCII (ASCII-8) uses 8 bits and represents
Answer: A. 256 characters
31. IBM chose to use ______ code in its computers instead of ASCII at first.
Answer: C. EBCDIC
32. Unicode was developed to support
Answer: D. all written languages of the world
33. UTF stands for
Answer: D. Unicode Transformation Format
34. An operating system (OS) is
Answer: C. essential software that manages memory, processes, hardware and software
35. Which of the following is an example of an operating system?
Answer: B. Linux
36. A process is
Answer: A. a program in execution
37. File management allows users to
Answer: D. create, copy, move, rename, delete and search files
38. A batch processing OS
Answer: B. groups similar tasks into batches and executes them sequentially
39. A multiprogramming OS
Answer: C. loads multiple programs into main memory so the CPU is rarely idle
40. A multitasking OS
Answer: A. performs multiple tasks concurrently by rapidly switching between them
41. A time-sharing OS divides CPU time into short intervals called
Answer: D. time slices
42. A real-time operating system (RTOS) is used where
Answer: C. timing is critical, such as medical equipment and traffic control
43. A distributed OS manages
Answer: B. a network of computers
44. An embedded OS is built into
Answer: A. the hardware of a specific device like a microwave oven or TV
45. The five states of a process are start, ready, running, waiting and
Answer: C. terminated
46. A process that is ready for execution but waiting for the CPU is in the
Answer: A. ready state
47. A process being executed by the processor is in the
Answer: D. running state
48. A process waiting for a resource is in the
Answer: B. blocked (waiting) state
49. Every process has at least
Answer: D. one thread
50. Interrupts are signals that
Answer: C. alert the CPU to events needing immediate attention
About Computer Science Class 10 Unit 1 MCQs (Federal Board)
These 76 Computer Science MCQs cover Class 10 Unit 1: Computer Systems of the Federal Board (FBISE) SSC-II (Class 10) syllabus. They are SLO-based MCQs as per the new pattern for FBISE exams. Each question has four options and the correct answer is shown, so you can practise for the annual examination and find the topics you still need to revise. The questions are split over 2 pages of 50. Download the Computer Systems MCQs as a PDF using the button at the top of this page.