Lesson T4.3.2

T4.3.2 Manipulating digital data Quiz: KS3 Computing, Unit 4

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson T4.3.2, Manipulating digital data: 20 multiple choice questions for the KS3 Computing (National Curriculum), Unit 4: Computer systems, written with Revision Ninja.

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The 20 questions

  1. What is the denary value of the binary number 1101?

    • 9
    • 15
    • 11
    • 13

  2. Convert the denary number 6 to binary.

    • 011
    • 101
    • 100
    • 110

  3. What is 0101 + 0011 in binary?

    • 1001
    • 0110
    • 1110
    • 1000

  4. What is 1101 + 0011 in binary?

    • 10100
    • 1100
    • 1110
    • 10000

  5. An AND gate gives an output of 1 only when which condition holds?

    • Both of its inputs are 1
    • At least one of its inputs is 1
    • Exactly one of its inputs is 0
    • Its input is 0

  6. What does an OR gate output when one input is 1 and the other input is 0?

    • 1
    • 0
    • It outputs no signal at all
    • It outputs both values at the same time

  7. What does a NOT gate do?

    • It copies its input to the output without changing its value
    • It stores its input in memory so that it can be used later in the cycle
    • It outputs 1 only when both of its inputs are 1 at the same time
    • It reverses its input, so a 1 becomes 0 and a 0 becomes 1

  8. Which Boolean expression is true when the user is a pupil AND has a valid password?

    • Pupil NOT valid password
    • NOT pupil AND NOT valid password
    • Pupil OR valid password
    • Pupil AND valid password

  9. A logic circuit outputs 1 for an AND gate with inputs 1 and 1. What is the output of a NOT gate fed by that output?

    • 0
    • It outputs 2
    • 1
    • It has no output

  10. Why is run-length encoding a form of lossless compression?

    • The original data can be rebuilt exactly from the encoded version
    • Some of the colour information is removed, which makes the file smaller
    • The data is converted into sound, which is then stored at a lower quality
    • The data is randomly shuffled so that it is shorter to send across the network

  11. Using run-length encoding, how would the text AAAABBBCC be written?

    • 4A3B2C
    • A4B3C2
    • 4A5BC
    • AB4C3

  12. What does a logical shift left do to a binary number such as 0011?

    • It gives 0001, which halves the value of the number and removes the last digit
    • It gives 1100, which is always four times the original value of the number
    • It gives 0011, because shifting a binary number does not change its value at all
    • It gives 0110, which doubles the value of the number

  13. What is the result of adding 1 to the largest 4-bit binary number, 1111, if the answer must stay in 4 bits?

    • 1110, because the final bit is discarded and the value is reduced by one
    • 1111, because the largest value cannot be increased any further by adding one
    • 0000, because the result overflows the 4 bits
    • 10000, which is kept in full because binary has no limit on the number of digits

  14. Which operation changes a binary number so that each bit is reversed?

    • AND, which keeps only the bits that are 1 in both numbers being compared
    • OR, which keeps the bits that are 1 in either of the numbers being compared
    • NOT, which inverts every bit of the number
    • Shift right, which removes the last bit and moves each other bit one place right

  15. A computer adds the binary numbers 0111 and 0001. What is the result?

    • 0110
    • 1010
    • 0100
    • 1000

  16. What is a truth table used for?

    • To list the names of each file stored in a folder on the user's computer
    • To show the number of pixels in each row and column of a bitmap image on screen
    • To record the speed of the processor during each cycle of the instruction set
    • To list every possible combination of inputs and the output a logic circuit gives for each

  17. Which of these is an example of a logical operation used in programming?

    • A command that prints the words of a text file in a larger font on the screen
    • A command that changes the colour of the background image on a web page at random
    • A command that saves a document to a USB drive when the user clicks the save button
    • An IF statement that checks whether a score is greater than 50 AND a time limit has not passed

  18. Why is binary addition useful in a computer?

    • It allows the computer to store files in alphabetical order on the hard drive
    • It allows the monitor to show more colours by reducing the bit depth of each pixel
    • It allows the user to type text more quickly into a word processor on screen
    • The processor uses it to carry out arithmetic on the numbers that represent data

  19. A pupil shifts 0101 one place to the right. What is the result?

    • 0100, which reduces the value of the number by one because the last bit is changed
    • 0010, which halves the value of the original number and discards the final bit
    • 1010, which doubles the value of the original number and adds a new bit to the end
    • 0101, because a shift right does not change the value of a binary number at all

  20. Which is an example of a Boolean condition used in a search?

    • A list of results sorted alphabetically from A to Z by the author's first name
    • Results that are in English AND were published after 2020
    • A file that is saved in a folder with a name that includes the year of publication
    • A result page that is displayed in a larger font to make it easier to read

All KS3 Computing quizzes