The Smart School Computer Science 9th New Attempt the following MCQs (Marks 6) No Question A B C D 1 Which of the following is a valid binary number? 1101102 11011 110.11 1101A 2 What is the octal equivalent of the decimal number 83? 123 111 145 167 3 Which number system is most commonly used by humans in daily life? Binary Octal Decimal Hexadecimal 4 Which of the following is a valid hexadecimal digit? F G 9.5 12 5 Which storage device uses flash memory for faster access? HDD SSD Cloud Storage Tape Drive 6 What is the ASCII code for the letter 'A'? 65 97 48 33 Write short answers of any 8 parts of the question. (2x8=16) (i) What is the range of a 4-byte signed integer? (ii) How is the hexadecimal number system useful in computing? (iii) Explain the process of converting a decimal number to binary with an example. (iv) What is the difference between signed and unsigned integers? (v) List two advantages of the binary number system in computers. (vi) What are the steps to perform binary addition? (vii) Convert the decimal number 45 to binary. (viii) Why is hexadecimal often used in computer science? (ix) Describe the process of converting a decimal number to octal. Attempt any 4 questions from the following. (4x9=36) 1. What is two’s complement? Show how -20 is represented in 8-bit two’s complement. Student Name Roll Number Section Time Allowed 45 minutes Total Marks 30 Chapters 2 Date Examiner Signature Test Paper Generator: App Developer: JAMSHED IQBAL