Welcome to the **9th Class Computer Science Chapter 05 MCQs Online**** Test**. We are presenting you with top MCQ questions from the **9th Class Computer Science Chapter Number Systems**.

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**9th Class Computer Science Chapter 05 MCQs with Answers**

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### MCQs Class 9 Computer Science with Answers

The purpose of these online MCQs tests is to help you evaluate your **9th Class Computer Science Chapter 05 MCQs**. These *Multiple Choice Questions (MCQs)* will prepare you for your academic success in the **9th Class Exams**. 9th Class Computer Science Chapters include Chapter No. 01 Introduction to Computer, Chapter No. 02 Computer Components, Chapter No. 03 Input Output Devices, Chapter No. 04 Storage Device, Chapter No. 05 Number Systems, Chapter No: 06 Boolean Algebra, Chapter No: 07 Computer Software and Chapter No: 08 Introduction To Windows.

**What is ****Number Systems****?**

The number system is simply a system to represent or express numbers. There are various types of number systems and the most commonly used ones are **decimal number system, binary number system, octal number system, and hexadecimal number system**.

**Chapter No: 5 ****Number Systems**

**1: The ASCII is a code.**

(a) 5 bit

(b) 6 bit

(c) **7 bit**

(d) 8 bit

**2: The EBCDIC is a code.**

(a) 5 bit

(b) 6 bit

(c) 7 bit

(d) **8 bit**]

**3: The collection of facts and figures is called**

(a) Information

(b) Statistics

(c) Mathematics

(d) **Data**

**4: The data after processing is called**

(a) **Information**

(b) Processed

(c) Percentage

(d) Information

**5: The set of characters including 26 characters of English alphabets and 10 decimal digits is called**

(a) Numeric data

(b) Alphabet data

(c) **Alphanumeric**

(d) A11

**6: Computers directly understand digits**

(a) Decimal

(b) **Binary**

(c) Octal

(d) Hexadecimal

**7: Computer did not directly understand**

(a) Letters

(b) Decimal

(c) **Both a b**

(d) None

**8: 45, 26, 15, 40 is a**

(a) Arranged data

(b) Mechanical

(c) **Raw**

(d) Fixed

**9: Data is classified into typed**

(a) 2

(b) **3**

(c) 4

(d) None

**10: Binary numbers are**

(a) 1,3

(b) 0,10

(c) **0, 1**

(d) 1,1

**11: Real data contains numbers, which may be**

(a) **Fractions**

(b) Whole Numbers

(c) Both a b

(d) None

**12: The base of decimal number system is**

(a) 2

(b) 8

(c) **10**

(d) 16

**13: The data is represented on a computer by means of a two state ON and OFF system called**

(a) A word

(b) **Binary system**

(c) Octal system

(d) ROM

**14: The base of binary number system is**

(a) **2**

(b) 8

(c) 10

(d) 16

**15: The base of octal number system is**

(a) 2

(b) **8**

(c) 10

(d) 16

**16: The binary number system is used in**

(a) Analog computers

(b) Binary computers

(c) Decimal computers

(d) **Digital computers**

**17: The base of hexadecimal number system is**

(a) 2

(b) 8

(c) 10

(d) **16**

**18: Alphanumeric characters are expressed in terms of binary codes. In ASCII each character is represented as a**

(a) 8 bit code

(b) 4 bit code

(c) 2 bit code

(d) **7 bit**

**19: 2’s complement of 1011.1 is**

(a) 0. 100. 10

(b) **0100.1**

(c) 1011.10

(d) 0100.0

**20: I’s complement of 1011.1 is**

(a) 0. 100.101

(b) 0100.11

(c) **1011.10**

(d) 0100.0

**21: A byte consist of nibbles**

(a) 1

(b) **2**

(c) 3

(d) 4

**22: 10° =**

(a) 10

(b) 0

(c) **1**

(d) 101

**23: The digit from 0 to 9 are called**

(a) **Decimal**

(b) Octal

(c) Binary

(d) Hexa

**24: The binary equivalent of ( 20) _{10 }is**

(a) 1111

(b) 10011

(c) 10010

(d) **10100**

**25: The decimal equivalent of ( 20) _{10} is**

(a) 18

(b) 24

(c) **20**

(d) invalid

**26: Decimal number system consists of**

(a) 0,1,2,3,4,5

(b) 0,1,2,3,4,5,6

(c) 0,1,2,3,4,5,6,7,

(d) **0,1,2,3,4,5,6,7,8,9**

**27: 453 =**

(a) 4 x 10^{2} + 5 x 10 + 3

(b) 10 x 4^{2} + 5 x 10

(c) **4 x 10 ^{2}+ 5 x 10 1 + 3 x 10^{0}**

(d) None

**28: The decimal equivalent of (10) _{s} is**

(a) 9

(b) 10

(c) 11

(d) **8**

**29: (236) _{10} = (?) _{10}**

(a) 158

(b) 157

(c) 155

(d) **236**

**30: (A) _{16 }=?**

(a) 10

(b) 11

(c) **16**

(d) 12

**31: In 645 the most significant digit is**

(a) 4

(b) 5

(c) **6**

(d) 45

**32: In 724 the least significant digit is**

(a) 7

(b) **4**

(c) 2

(d) 72

**33: The number system that contains the range of 10 number and 6 alphabets is**

(a) Decimal

(b) Octal

(c) Binary

(d) **Hexa**

**34: (0001) _{2 }= (?)**

(a) A

(b) 10

(c) **1**

(d) 7

**35: Binary digits are denoted by**

(a) IBT

(b) TBI

(c) **BIT**

(d) BTI

**36: 01001 _{(2)} in decimal system is equal to**

(a) 10

(b) 15

(c) 18

(d) **9**

**37: I’s complement of 01110 is**

(a) 00011

(b) **10001**

(c) 11001

(d) 01010

**38: In binary number system 0 + 0 =?**

(a) 1

(b) **0**

(c) 00

(d) 10

**39: In binary number system 1 X 0 =?**

(a) 1

(b) **0**

(c) 10

(d) 01

**40: ASCII for 6 is equal to**

(a) 0110001

(b) **0110110**

(c) 1101100

(d) 0011010

**41: Which of the following is not a real number?**

(a) 76.2

(b) 6.2

(c) **4**

(d) 4.0

**42: In Hexadecimal number system the value of E is**

(a) 15

(b) 12

(c) **14**

(d) 16

**43: The value of hexadecimal digit A is (a) 9**

(b) **10**

(c) 11

(d) 12

**44: The number 822 represent the**

(a) Binary number

(b) Octal Number

(c) **Decimal**

(d) None

**45: Add 01011101 and 00110010**

(a) 100111

(b) 1010101

(c) **10001111**

(d) 100011111

**46: The binary equivalent of decimal number (3) _{10} is**

(a) 10

(b) **11**

(c) 111

(d) 101

**47: The binary equivalent of (F)16 is**

(a) 1010

(b) 1110

(c) 0111

(d) **1111**

**48: The hexadecimal equivalent of binary number (101001) _{2} is**

(a) 2A

(b) 2B

(c) **29**

(d) 28

**49: The most commonly used character for transmission are**

(a) EBCDIC

(b) BCD

(c) UNI

(d) **ASCII**

**50: In scientific notation power of 10 is called**

(a) Logarithm

(b) Exponent

(c) **Mantissa**

(d) Coefficient