Note AcademyNote Academy
Start

Computer Science · Oct / Nov 2023 · Paper 11 · Question 2

0478

As printed in the paper

The question as text

A car park has a payment machine that allows a customer to pay for their parking. The cost of parking is displayed as a denary number on a screen on the payment machine. The cost of parking is stored in two 8-bit binary registers. For the parking cost of $10.50: • register 1 stores the denary value 10 as binary • register 2 stores the denary value 50 as binary.

Read automatically from the paper; the printed page above is exact.

Show the answer and mark scheme

  • 2(a)[2]

    One mark for each correct part of the fee, in the correct order:

    17
    70

    (Correct fee $17.70)

  • 2(b)[2]

    One mark for each correct binary value:

    Register 1

    00001110

    Register 2

    01100010

  • 2(c)[4]

    One mark for each correct hexadecimal value, in the correct order.

    A
    0
    3
    D

    (Ticket number A03D)

  • 2(d)[2]

    Two from:

    It contains logic gates/switches …
    … that process the values 1 and 0 // have two states

  • 2(e)[4]

    Any four from:

    Compares the ticket number received to stored data
    … that is a database/file of ticket numbers
    … checks the ticket number is listed as paid
    If the data matches/cost is paid it sends a signal to raise the barrier
    If the data does not match/cost is not paid, the barrier remains down
Practise this paper →

Make a free account to save your answers and see your weak topics and ask the AI why a wrong answer is wrong.