IT GACE Computer Science Practice Test

Base2 is the name of which number system?

Decimal Number System Binary Number System Octal Number System Hexadecimal Number System

Correct Answer:

Binary Number System

Explanation:

Base indicates how many digits a numbering system uses and how each position is weighted. In base 2, there are only two digits, 0 and 1, and each place value is a power of 2. For example, 1010 in base 2 equals 1×8 + 0×4 + 1×2 + 0×1 = 10 in decimal. This naming reflects two digits being used, which is why it’s the binary number system. (Decimal uses ten digits, octal uses eight, and hexadecimal uses sixteen.) In computing, binary is fundamental because devices operate with two distinct states.

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