This Computer Awareness quiz on Number Systems and Data Representation puts 12 multiple-choice questions to you, the verified MCQs published with GK24's note on the topic, 4 of them asked in real previous-year papers. Every question carries a full explanation of why the correct option is right and why the other options are wrong, so you learn the fact behind the answer rather than the letter. Attempt it right after reading the note, keep to the timer, and use the explanations at the end to mark what needs another look. Sit it again before the exam as a quick revision of the topic.
12 questions with answers and explanations
What is the hexadecimal equivalent of this binary number (1110)2?
Hexadecimal has base 16, and because 2 raised to the power 4 equals 16, exactly four binary bits make one hexadecimal digit.
Read the full explanation →The binary equivalent of octal number 627 is:
Octal has base 8, and because 2 raised to the power 3 equals 8, every octal digit expands into exactly three binary bits.
Read the full explanation →(1101 0001)2 binary number is same as which octal number?
To turn a binary number into octal, group the bits in threes starting from the rightmost bit, adding leading zeros to complete the last group, because three bits cover the eight octal digits.
Read the full explanation →The difference between the two binary numbers 10010000 and 1111001 is:
The safest way to handle a binary subtraction in an examination is to convert both numbers to decimal, subtract, and convert the answer back.
Read the full explanation →How many bits make one nibble?
A bit, short for binary digit, is a single 0 or 1 and is the smallest unit of data a computer handles.
Read the full explanation →One kilobyte (KB) is exactly equal to how many bytes?
Storage units in computing grow in powers of two rather than powers of ten, because addresses are binary. One kilobyte is 2 raised to the power 10 bytes, which equals 1024 bytes.
Read the full explanation →Which of the following is NOT a valid octal number?
The octal system has base 8, so it uses only the eight digits from 0 to 7. The general rule is that the largest digit of any number system is one less than its base, which means the digits 8 and 9 can never appear in an octal number.
Read the full explanation →The decimal equivalent of the binary number 11001 is:
To convert a binary number to decimal, write the place values from the right as 1, 2, 4, 8, 16 and so on, multiply each bit by its place value and add the results.
Read the full explanation →Standard ASCII uses how many bits to represent one character?
ASCII stands for American Standard Code for Information Interchange. In its standard form it is a seven-bit code, so it can represent 2 raised to the power 7, that is 128 different characters: the English capital and small letters, the ten digit symbols, punctuation marks and a set of control…
Read the full explanation →The 2's complement of the binary number 1010 is:
The 2's complement is found in two steps. First take the 1's complement by changing every 0 to 1 and every 1 to 0; for 1010 this gives 0101.
Read the full explanation →In the hexadecimal system, the symbol D stands for which decimal value?
Hexadecimal has base 16 and therefore needs sixteen different symbols. The digits 0 to 9 serve for the first ten values, and because no single digit exists for the values 10 to 15, the letters A to F are borrowed.
Read the full explanation →What is the largest unsigned decimal number that can be stored in one byte?
One byte holds eight bits, and each bit can be either 0 or 1, so the number of different patterns is 2 raised to the power 8, that is 256.
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