GCSE Grade Prediction Tool - Computer Science
Computer Science Grade Predictor
OCR J277 Paper 1 – Question 1: Data Representation (10 marks). Answer every part, then press Mark my answers.
This question is taken from our predicted Paper 1. No calculator.
a) State the main advantage of using the Unicode character set instead of the ASCII character set. [1 mark]
b) Convert the denary number 109 into an 8-bit binary number. Show your working out. [2 marks]
c) Convert the hexadecimal value 4C into denary. Show your working out. [2 marks]
d) A computer performs a 2-place left binary shift on the binary number 0010 1100.
i) State the new binary number after the shift. [1 mark]
ii) Explain the effect this shift has on the original denary value. [1 mark]
e) A logic circuit is represented by the expression:
P = NOT (A AND B)
Complete the truth table for this expression. [3 marks]
| A | B | A AND B | P |
|---|