Question 1

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 2

Which SQL command is used to retrieve data from a database table?

Accepted Answer

SELECT is the SQL command used to query and retrieve specific data from one or more database tables.

Question 3

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 4

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 5

What does a loop in programming allow you to do?

Accepted Answer

Loops enable repeated execution of code blocks based on specified conditions, reducing redundancy.

Question 6

In programming, what is a function primarily used for?

Accepted Answer

Functions are reusable blocks of code designed to perform specific tasks and improve code organization and efficiency.

Question 7

What is the difference between '=' and '==' operators in programming?

Accepted Answer

The '=' operator assigns a value to a variable, while '==' operator compares two values for equality.

Question 8

What is the primary purpose of a variable in programming?

Accepted Answer

Variables are containers for storing data values that programs use and manipulate during execution.

Question 9

Convert the hexadecimal number 2F to decimal.

Accepted Answer

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

Question 10

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 11

Which of the following is a correct example of declaring a variable in most programming languages?

Accepted Answer

The syntax 'int age = 25;' correctly declares an integer variable with proper data type and initialization.

Question 12

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 13

Convert the decimal number 25 to binary.

Accepted Answer

25 ÷ 2 = 12 remainder 1, 12 ÷ 2 = 6 remainder 0, 6 ÷ 2 = 3 remainder 0, 3 ÷ 2 = 1 remainder 1, 1 ÷ 2 = 0 remainder 1, reading remainders bottom-to-top gives 11001.

Question 14

What is the hexadecimal equivalent of the binary number 10101010?

Accepted Answer

Binary 10101010 groups into 1010 (10 in decimal = A in hex) and 1010 (10 in decimal = A in hex), giving AA.

Question 15

Convert the octal number 75 to decimal.

Accepted Answer

75 in octal = (7 × 8¹) + (5 × 8⁰) = 56 + 5 = 61 in decimal; rechecking: 7×8 + 5 = 61 is correct, but the answer key shows 63—verify: actually 7×8+5=61 (answer B is correct).

Question 16

How many bits are required to represent the decimal number 100 in binary?

Accepted Answer

100 in binary is 1100100, which requires 7 bits; the highest power of 2 less than 100 is 2⁶ = 64, so 7 bits are needed.

Question 17

What is the decimal value of the hexadecimal number 2F?

Accepted Answer

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

Question 18

Convert the binary number 11110000 to its octal equivalent.

Accepted Answer

Binary 11110000 groups into 011 (3 in octal), 110 (6 in octal), 000 (0 in octal), giving 360 in octal.

Question 19

Which of the following is NOT a basic data type in programming?

Accepted Answer

Filename is not a basic data type; integer, float, and boolean are fundamental data types in programming.

Question 20

What does SQL stand for?

Accepted Answer

SQL stands for Structured Query Language, which is the standard language for managing and querying relational databases.

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