Kit Library / Mathematics / Electronic Mathematics

⚡ Topic Learning Kit

Number Systems

English 16 leveled MCQs Free

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What you'll study, topic by topic

1

Electronic Mathematics Unit 1: Number Systems, Codes, and Representations

~8 min · full explanation, examples & memory tricks in the app

❓ Leveled MCQ practice

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16 questions laddered from warm-up to topper-level, each with an explanation. A taste:

Which of the following is the base of the hexadecimal number system?

Beginner
A 2 B 16 C 8 D 10
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16

Hexadecimal is a base-16 number system, using digits 0-9 and letters A-F.

What is the binary equivalent of the decimal number 10?

Beginner
A 1010 B 1100 C 1110 D 1001
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1010

Decimal 10 in binary is 1010 because $1 \times 2^3 + 0 \times 2^2 + 1 \times 2^1 + 0 \times 2^0 = 8 + 0 + 2 + 0 = 10$.

Which of the following is NOT a valid BCD code?

Intermediate
A 1010 B 0000 C 0111 D 1001
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1010

BCD (Binary Coded Decimal) uses only the binary patterns 0000 to 1001 to represent decimal digits 0-9. The pattern 1010 represents decimal 10, which is not a single decimal digit, so it is invalid in BCD.

What is the 1's complement of the binary number 1010?

Intermediate
A 0101 B 1100 C 0110 D 1011
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0101

The 1's complement is obtained by flipping each bit: 1 becomes 0 and 0 becomes 1. So 1010 becomes 0101.

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