YOUR PRACTICE SPACE · AS TEST LAB

Topic 1.1
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Try 10 Chapter 1 questions, then check your answers against the original mark schemes. Sign in to explore all tests.

10 available question sets

26 total marks

1 syllabus topic

Question group 1 of 10

9618/11/M/J/26 · Question: 1(a)(i)

A computer can store numbers and text in binary.

The computer uses the UNICODE character set.

Complete the table by calculating the missing values.

character	denary	binary	hexadecimal
		0001 1110 1001	1E9
@	64		40
	911	0011 1000 1111
		0001 0101 1101 0110	15D6

working space

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Character	Denary	Binary	Hexadecimal
	489	0001 1110 1001	1E9
@	64	0100 0000	40
	911	0011 1000 1111	38F
	5590	0001 0101 1101 0110	15D6

Question group 2 of 10

9618/11/M/J/26 · Question: 1(a)(ii)

A computer can store numbers and text in binary.

The computer uses the UNICODE character set.

Identify one other character set and explain how it is different from UNICODE.

character set

differences

[3]

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Question group 3 of 10

9618/11/M/J/26 · Question: 1(b)

A computer can store numbers and text in binary.

The computer also uses two’s complement.

Convert the 8-bit two’s complement binary integer 01101011 into denary.

[1]

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Question group 4 of 10

9618/11/M/J/26 · Question: 1(c)

A computer can store numbers and text in binary.

Show how the denary number 30 is subtracted from the binary number 01101011 using binary subtraction.

Show your working.

[2]

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Mark scheme [2]

1 mark for correct working

showing/working binary subtraction

1 mark for correct answer

0100 1101

Method 1: Change +30 to -30 and add

30 in binary: 0001 1110

Flip bits:     1110 0001
              +0000 0001
Add the 1:     1110 0010

Add –30:       0110 1011
               1110 0010
           (1) 0100 1101

Method 2: Direct Subtraction

 0110 1011
–0001 1110
 0100 1101
   11 1     Carries

Guidance

No marks for converting to denary and back

Method 1: Direct subtraction Needs to show the carries for the working mark

Method 2: Change +30 to –30 and add Needs to show the conversion and the addition

Question group 5 of 10

9618/11/M/J/26 · Question: 1(d)

A computer can store numbers and text in binary.

Identify two differences between binary prefixes and decimal prefixes.

[2]

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Question group 6 of 10

9618/12/M/J/26 · Question: 5(a)

Complete the table by calculating the missing values.

denary	unsigned binary	hexadecimal	Binary Coded Decimal (BCD)
160	10100000	A0
	100100001	121	001010001001
2486		9B6	0010010010000110
35123	1000100100110011		00110101000100100011

working space

[4]

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Mark scheme [4]

1 mark for each correctly completed value

denary	unsigned binary	hexadecimal	Binary Coded Decimal (BCD)
160	10100000	A0	0001 0110 0000
289	100100001	121	001010001001
2486	1001 1011 0110	9B6	0010010010000110
35123	1000100100110011	8933	00110101000100100011

Question group 7 of 10

9618/12/M/J/26 · Question: 5(b)

Complete the table by writing the answer to each statement.

statement	answer
The smallest 12-bit two’s complement binary number
The denary value represented by the 8-bit unsigned binary number 01100010 after a logical right shift of 2 places has been applied.
The binary value after a cyclic left shift of 4 places has been applied to the binary number 10010101

[3]

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Mark scheme [3]

1 mark for each correct answer

statement	answer
The smallest 12-bit two's complement binary number	1000 0000 0000
The denary value represented by the 8-bit unsigned binary number 01100010 after a logical right shift of 2 places has been applied.	24
The binary value after a cyclic left shift of 4 places has been applied to the binary number 10010101	0101 1001

Guidance

Note: The first answer must be 12 bits and a binary value

Note: The second answer must be in denary.

Question group 8 of 10

9618/13/M/J/26 · Question: 6(a)

Draw one or more lines to match each denary number with its equivalent unsigned binary, hexadecimal or Binary Coded Decimal (BCD) value(s).

Denary number

3120

289

22516

15851

Equivalent unsigned value

Hexadecimal:121

BCD:00010101100001010001

Binary:110000110000

Hexadecimal:57F4

Binary:11110111101011

BCD:0011000100100000

Connect two boxes by dragging or selecting them. Select a connected pair again to remove its line.

[4]

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Question group 9 of 10

9618/13/M/J/26 · Question: 6(b)

Complete the binary addition. Show all of your working.

carry
	1	1	0	1	0	1	0	0	1	1	1	1
+	1	1	1	1	1	1	0	0	1	1	1	1
result

[2]

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Question group 10 of 10

9618/13/M/J/26 · Question: 6(c)

Convert the two’s complement integer 011010110001 into denary.

[1]

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Denary number

Equivalent unsigned value

Denary number

Equivalent unsigned value

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Topic 1.1
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