Pre assessment Computer Science

Match the following terms with their definitions in Computing:

• Binary sequence

• A group of 8 0s and 1s

• Byte

• A sequence of 0s and 1s

• Bit

• Very small piece

• Bit

• Binary digit

Which of the following is a binary digit?

• 2

• bit

• 0

• 01

Which of the following is a byte?

• 8

• bit bit bit bit bit bit bit bit

• 01100101

• 1

(a)   is a hexadecimal number.

• SF
• 3D
• 1010
• 4J

How many different sequences can there be with 4 binary digits?

• 4

• 8

• 16

• 32

Which of the following binary numbers is equivalent to decimal (denary) 9?

• 101

• 1001

• 1010

• 10000

Which of the following decimal (denary) numbers is equivalent to binary 110?

• 2

• 6

• 30

• 110

Read the Python program below: b = 42 a = 13 print(a,b) When this program is executed, what will be displayed on the screen?

• 13 42

• 42 13

• a b

#Read the Python program below:

count = 3

while count > 0:

print(count)

count = count +1

#How many times will line 3 be executed?

• 1

• 2

• 3

• 4

• Infinitely (the condition in line 2 will never become False)

What is the binary representation of the decimal number 15?

• 1110

• 1111

• 1010

• 1001