AQA GCSE Separate Science Physics – Paper 1 Higher Tier Predicted Paper 2023 WITH marking scheme

AQA GCSE Separate Science Physics – Paper 1 Higher Tier Predicted Paper 2023 WITH marking scheme Name …………………………………………………………………… Date ………………… 1 hour 45 minutes allowed. You may use a calculator and an AQA equation sheet. Grade boundaries These are VERY rough guesses! Getting a 7 on this paper does not guarantee you the same mark in the exam. • 9 75% • 8 65% • 7 55% • 6 45% • 5 35% • 4 25% • 3 20% 01 a) Electricity in the UK is distributed by means of a “National Grid”. Define the term “National Grid.” [1 mark] b) State the approximate voltage and frequency at which mains electricity is distributed. [4 marks] i. Voltage: ii. Frequency: c) In Britain, mains electricity plugs have a total of three wires. Describe and explain the wires and the other safety features of the plug. [5 marks] _ d) A student wanted to replace a fuse, the original fuse was a 3 amp, and the replacement was a 13 amp. A safe current for the device is 2 amps; if the resistance across the fuse is 2 calculate the potential difference. [3 marks] Volts e) The fuse contains a thin wire, that allows electricity to flow. Only current below the rating can flow across the fuse. Describe how a fuse works. [2 marks] f) The resistance in the fuse increased to 3 and the potential difference changed to 12V (this is not the answer to part d). Calculate the current. [3 marks] 02 a) Describe the current model describing the structure of an atom. [3 marks] b) Explain why we use the term ‘model of the atom’. [2 marks] c) The image shows part of the periodic table, this part is for carbon. Compare carbon 12 and carbon 14. [4 marks] _ d) The term atom is from the Greek atomon for ‘uncuttable’ since Democritus an Ancient Greek philosopher came up with the idea of atoms. We now know that within atoms there are a few sub-atomic particles. Explain how the model of the atom has changed over the years, you should include the names of any scientist involved. [6 marks] _ 03 A group of students wanted to investigate how the diameter of a wire affected the resistance of the wire. a) The ammeter and voltmeter have not been labelled in the diagram, label them. [2 marks] b) Suggest how you could use the values from these reading to determine the resistance. [1 mark] c) Students attached crocodile clips to either end of a wire and recorded the resistance. However, the students had trouble attaching the crocodile clip precisely. State what kind of error this is and what affect it would have on the results. [2 marks] d) The diameter of the resistance wire A was 3mm, use Area = r2 to calculate the cross-sectional area of the end of wire A. Assume  to be 3.14. Give your answer to two decimal places. [3 marks] _ e) As diameter increases the resistance decreases. i. Describe this relationship. [1 mark] ii. Sketch a graph to show this relationship. [3 marks] iii. Wire B has a diameter of 4mm, compare the resistance in wires A and B. [1 mark] iv. Suggest if wire A or wire B would be best for an electrical cable. [1 mark] f) Two groups used the same section of resistance wire A, to measure resistance. The second group used the same set up, immediately after the first group, without turning off the equipment. Their results were different. Describe how the results would be different and explain why. [3 marks] 04 a) Draw the circuit symbol for a diode. [1 mark] b) Sketch the current/potential difference graph for a diode. [3 marks] c) Explain the shape of this graph. [3 marks] d) Give an example of use for a diode and explain how it works. [2 marks] 05 A student was investigating a complex circuit for 2 minutes and 30 seconds. The student needed to know the charge running through the circuit, but they could not read that information directly. They decided to work out the charge using other values they could read. During this time 67.5kJ of work was done by the circuit and the potential difference recorded across two points was 180V. a) Calculate the power that was used. [4 marks] b) Calculate the current in the circuits. [4 marks] c) Thus calculate the charge in the circuit. [3 marks]