Question 1

In ASCII data representation, which decimal value represents the character 'A'?

Accepted Answer

In ASCII (American Standard Code for Information Interchange), uppercase letter 'A' is represented by decimal value 65.

Question 2

What is the binary representation of the decimal number 13?

Accepted Answer

13 in decimal = 8 + 4 + 1 = 2³ + 2² + 2⁰ = 1101 in binary.

Question 3

Convert the hexadecimal number 2F to decimal.

Accepted Answer

2F in hex = (2 × 16¹) + (15 × 16⁰) = 32 + 15 = 47 in decimal.

Question 4

Which number system uses only digits 0 and 1 for data representation in computers?

Accepted Answer

Binary system is the fundamental number system used by computers to represent all data using only two digits: 0 and 1.

Question 5

How many bits are required to represent the decimal number 255?

Accepted Answer

255 in binary is 11111111, which requires exactly 8 bits (maximum value for 8-bit representation).

Question 6

What is the octal equivalent of the binary number 101110?

Accepted Answer

Binary 101110 grouped as 101(5) and 110(6) = 56 in octal.

Question 7

A byte can represent how many different values?

Accepted Answer

One byte equals 8 bits, and 2^8 = 256 different values (0-255) can be represented.

Question 8

Convert the binary number 11011011 to hexadecimal.

Accepted Answer

Binary 11011011 = 1101 (13 = D) and 1011 (11 = B) in hexadecimal, giving DB.

Question 9

What is the decimal equivalent of the binary number 10110?

Accepted Answer

10110 in binary = 1×16 + 0×8 + 1×4 + 1×2 + 0×1 = 22 in decimal.

Question 10

How many bits are required to represent 256 different values in binary?

Accepted Answer

2^8 = 256, so 8 bits can represent values 0-255 (256 total values), requiring 9 bits for values up to 256.

Question 11

Convert the hexadecimal number 2F to decimal.

Accepted Answer

2F in hexadecimal = 2×16 + 15 = 32 + 15 = 47 in decimal.

Question 12

Which number system uses only the digits 0 and 1?

Accepted Answer

Binary is a base-2 number system that uses only digits 0 and 1 for data representation in computers.

Question 13

What is the octal equivalent of the decimal number 64?

Accepted Answer

64 ÷ 8 = 8 remainder 0; 8 ÷ 8 = 1 remainder 0; 1 ÷ 8 = 0 remainder 1, giving octal 100.

Question 14

A computer stores the decimal number 156 in memory. What is its equivalent representation in hexadecimal (base 16)?

Accepted Answer

156 ÷ 16 = 9 remainder 12 (C in hex); 9 ÷ 16 = 0 remainder 9; reading remainders bottom-to-top gives 9C₁₆.

Question 15

In binary representation, how many bits are required to uniquely represent 512 different data values in a computer system?

Accepted Answer

Since 2⁹ = 512, exactly 9 bits are needed to represent 512 unique values (0 to 511).

AFCAT Data Representation

Data Representation — Practice Questions