Exam 02: Number Systems and Data Representation

Exam 02: Number Systems and Data
Representation
Computer Science Exam Series | Time: 2 hours | Total: 84 marks

Answer all questions. Part A has 50 multiple choice questions (1 mark each). Part B has 8 short
answer questions (3 marks each). Part C has 2 longer questions (5 marks each). In Part A the
correct option is marked with a double tick. Calculators are not allowed. Answer key and model
answers are at the end.


Part A: Multiple Choice (50 marks)
Q1. How many different digits does the binary number system use?
a) 2 ✔✔
b) 8
c) 10
d) 16

Q2. What is the decimal value of binary 1010?
a) 8
b) 10 ✔✔
c) 12
d) 5

Q3. What is the decimal value of binary 1111?
a) 14
b) 16
c) 15 ✔✔
d) 17

Q4. What is the decimal value of binary 10000?
a) 8
b) 16 ✔✔
c) 32
d) 10

Q5. What is the decimal value of binary 11001?
a) 25 ✔✔
b) 19
c) 21
d) 27




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, Q6. What is the decimal value of binary 101101?
a) 43
b) 47
c) 45 ✔✔
d) 41

Q7. What is the decimal value of the 8-bit binary number 11111111?
a) 128
b) 255 ✔✔
c) 256
d) 127

Q8. What is decimal 7 in binary?
a) 101
b) 110
c) 111 ✔✔
d) 1000

Q9. What is decimal 20 in binary?
a) 10010
b) 10100 ✔✔
c) 10110
d) 11000

Q10. What is decimal 37 in binary?
a) 100101 ✔✔
b) 101001
c) 100011
d) 110001

Q11. What is decimal 100 in binary?
a) 1010100
b) 1101100
c) 1100010
d) 1100100 ✔✔

Q12. What is the decimal value of hexadecimal A?
a) 9
b) 10 ✔✔
c) 11
d) 12




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