Octal uses a base of 8 (0-7), whereas hexadecimal uses a base of 16 (0-9, A-F).

Multiply each digit by powers of 2 and sum them up.

It is widely used in programming, color codes, and memory addressing .

Binary arithmetic is essential for computer processing, logic circuits, and digital systems .

Binary addition only uses 0 and 1 , whereas decimal addition involves 0-9 .

The sum is 0 , and a carry of 1 is added to the next column.

Question 1

Q1: Why do computers use binary numbers?

Accepted Answer

Computers use binary because they work with electronic circuits that have two states: ON (1) and OFF (0).

Question 2

Q2: What is the difference between octal and hexadecimal?

Accepted Answer

Octal uses a base of 8 (0-7), whereas hexadecimal uses a base of 16 (0-9, A-F).

Question 3

Q3: How do I convert a binary number to a decimal manually?

Accepted Answer

Multiply each digit by powers of 2 and sum them up.

Question 4

Q4: Where is the hexadecimal system used?

Accepted Answer

It is widely used in programming, color codes, and memory addressing.

Question 5

Q5: Why is binary arithmetic important?

Accepted Answer

Binary arithmetic is essential for computer processing, logic circuits, and digital systems.

Question 6

Q6: How is binary addition different from decimal addition?

Accepted Answer

Binary addition only uses 0 and 1, whereas decimal addition involves 0-9.

Question 7

Q7: What happens when 1+1 in binary?

Accepted Answer

The sum is 0, and a carry of 1 is added to the next column.

Number System – Class 7 Computer Science Notes | Examples, Conversions & Practice Questions

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