Computer Science Mock Exam Paper_IGCSE

Calculate the binary numbers:

(a) 10 + 10

(b) 100 + 100

(c) 1000 + 1000

(d) 10000 + 10000

• (a) 100

  (b) 1000

  (c) 10000

  (d) 100000

• (a) 10

  (b) 100

  (c) 1000

  (d) 10000

• (a) 1

  (b) 10

  (c) 100

  (d) 1000

• (a) 101

  (b) 1

  (c) 10

  (d) 100

Calculate the binary numbers:

(a) 1101 − 110

(b) 11011 − 110

(c) 1111 − 111

(d) 110101 − 1010

• (a) 0110

  (b) 010001

  (c) 1001

  (d) 0101111

• (a) 0111

  (b) 010101

  (c) 1000

  (d) 0101011

• (a) 1110

  (b) 110001

  (c) 0001

  (d) 1101111

• (a) 1100

  (b) 110101

  (c) 0011

  (d) 1101110

Calculate the binary numbers:

(a) 1011 × 100.

(b) 110110 × 1000

(c) 11011 × 10000

• (a) 101000

  (b) 110100011

  (c) 110100011

• (a) 101001

  (b) 110100010

  (c) 110100010

• (a) 101101

  (b) 110110010

  (c) 110110010

• (a) 101100

  (b) 110110000

  (c) 110110000

(a) Convert the binary numbers (11101) and (1110) to base 10

(b)  Add together the two base 10 numbers.

(c)  Add together the two binary numbers.

(d)  Convert your answer to base 10 and compare with your answer to (b).

• (a) (27) and (12)

  (b) 41

  (c) 0101001

  (d) 41

• (a) (28) and (13)

  (b) 42

  (c) 0101010

  (d) 42

• (a) (29) and (14)

  (b) 43

  (c) 0101011

  (d) 43

• (a) (26) and (11)

  (b) 40

  (c) 0101001

  (d) 40

(a) Convert the binary numbers (11101) and (10111) to base 10.

(b)  Calculate the difference (subtraction ) between the two base 10 numbers.

(c)  Convert your answer to (b) into a binary number.

(d)  Calculate the difference between the two binary numbers and

compare with your answer to (c).

• (a) (29) and (23)

  (b) 6

  (c) 0110

  (d) 0110

• (a) (28) and (22)

  (b) 7

  (c) 0111

  (d) 0111

• (a) (30) and (20)

  (b) 11

  (c) 1011

  (d) 1011

• (a) (20) and (15)

  (b) 10

  (c) 1010

  (d) 1010

Here are 3 binary numbers:

(1110101) (1011110) (1010011)

Working in binary,

(a)  add together the two smaller numbers,

(b)  add together the two larger numbers,

(c)  take the smallest number away from the largest number,

(d)  add together all three numbers.

• (a) (010110001)

  (b) (011010011)

  (c) (010111)

  (d) (0100100110)

• (a) (010110011)

  (b) (011010111)

  (c) (011111)

  (d) (0101100110)

• (a) (010100001)

  (b) (011000011)

  (c) (010011)

  (d) (0100000110)

• (a) (110110001)

  (b) (111010011)

  (c) (110111)

  (d) (1100100110)

Solve the following equations, where all numbers, including x, are binary:

(a) x +11=1101

(b) x −10 =101

(c) x − 1101 = 11011

(d) x + 1110 = 10001

• (a) 1010

  (b) 111

  (c) 0101000

  (d) 011

• (a) 10101

  (b) 1111

  (c) 0101010

  (d) 0111

• (a) 0101

  (b) 110

  (c) 0101100

  (d) 010

• (a) 1011

  (b) 110

  (c) 0001000

  (d) 111

Calculate the decimal equivalent and check that it is correct.

• 1001

  3+6=9

• 1011

  3+8=11

Convert the following between binary and hex:

(a) A4

(b) D4

(c) 567

(d)F33

• (a) 10100111

  (b) 11010111

  (c) 010101111111

  (d) 111100111111

• (a) 10100100

  (b) 11010100

  (c) 010101100111

  (d) 111100110011

• (a) 10000111

  (b) 11000111

  (c) 010001111111

  (d) 111000111111

• (a) 10100101

  (b) 11010101

  (c) 010101111110

  (d) 111100111110

A shopping mall has an information point. Visitors can use it to find out which shops are in the mall

and where they are located.

(a)  Identify one input device that could be built into the information point.

Give an example of how that device would be used.

(b) Identify one output device that could be built into the information point. Give an example of how that device would be used.