Year 9 Computing — course check

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Knowledge check

Year 9 Computing — course check

Choose one answer for each question. Aim for at least 60%. You can practise and try again. Your score is saved only when you submit the saved quiz.

Question 1

A numeric square function should return what for -3?

-9 9 6

Multiplying two negative threes gives positive nine.

Question 2

For permitted ages 12–16 inclusive, which pair tests the upper edge and just outside it?

16 and 17 12 and 13 5 and 6

16 is valid and 17 is immediately invalid.

Question 3

After the first insertion step on [5,1,4], the list is:

[1,4,5] [5,4,1] [1,5,4]

Only the first two items have been put into a sorted prefix.

Question 4

The maximum unsigned eight-bit value is:

256 255 128

2⁸ - 1 = 255.

Question 5

A 20 by 10 image at 8 bits/pixel uses how many bytes of raw pixel data?

200 1,600 20

20 × 10 × 8 bits divided by eight gives 200 bytes.

Question 6

A successful one-time score display proves persistence after reopening:

Always If the page is colourful No; reopening and checking stored state is needed

Visible transient state is not evidence of durable storage.

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