AQA Physics PHYA4 - 20th June 2016 [Exam Discussion Thread]

Hi guys, I think I got 65/75 in unit 4 and about 65/75 in unit 5. Could you give me a rough estimate for the UMS marks please.

Unit 4: 120/120
Unit 5: Depends what option you did.

I did Astro

Unit 4: 120/120
Unit 5: Depends what option you did.

What do you think UMS caps will be for PHYA4 and PHYA5 with astro?

And do you think ISA boundaries might drop a little?

For PHYA4, maybe 64 or 65. For PHYA5 (Astro), 68 or so.

Can't comment on the ISA boundaries, I did the EMPA instead.

Do you really think Unit 5 boundaries will be that high? In June 2015, the full UMS cap for PHA5A was 68, but that paper was far easier..no?

What do you guys think the PHYA5 + Turning points A* boundary will be? 54/75?

You guys probably won't remember this, but if you did the EMPA, do you happen to know whether the electric field strength was increasing or decreasing in that one question? I put it was increasing because the gradient of the graph was increasing (it was sloping downward) but many people said it was decreasing.

Yeah it was increasing

I've got a list of the EMPA questions in rough note form, I'm out at the moment but when I'm home I'll post it.

AQA A2 Physics EMPA, June 2016

Section A Task 1 (16 marks)
Part 1 - Electric field
Record the voltmeter readings when the contact is placed at certain points along the paper. (1 mark)
Plot a graph of voltmeter reading against distance. (2 marks)
State the direction of the electric field. (1 mark)
State and explain how the electric field strength changes with distance. (2 marks)

Part 2 - Capacitor discharge
Record the discharge times at different points along the paper. (1 mark)
Evaluate $\dfrac{T_{100}}{T_{200}}$. (1 mark)
Explain how the calculated value for $\dfrac{T_{100}}{T_{200}}$ can be verified from the graph plotted in Question 1. (4 marks)
The terminals on the paper are now reversed. Sketch the voltmeter reading against distance graph in this case. (2 marks)
Explain what would happen to the value of $\dfrac{T_{100}}{T_{200}}$ in this case. (2 marks)

Section A Task 2 (15 marks)
Explain how you ensured that the ruler was vertical. (2 marks)
Table of results. (4 marks)
Graph. (9 marks)

Section B (24 marks)
Question 1 - Section A Task 2 Analysis
Calculate the gradient of the graph. (4 marks)
Explain the effect (if any) on the graph when using a longer pendulum. (2 marks)
Explain the effect (if any) on the graph if the ruler was reversed. (2 marks)

Question 2 - Mass-spring system and forced oscillations
Explain why the fiducial mark was placed in the shown position. (1 mark)
Calculate the percentage uncertainty in a set of data. (3 marks)
Calculate the natural frequency of the system, using the supplied data. (1 mark)
Add a scale to the horizontal axes. (1 mark)
State the amplitude at the marked point A. (1 mark)
Explain how the student obtained an accurate shape for the graph around its maximum point. (2 marks)
Sketch the graph that would be produced by repeating the experiment using two springs in series. (2 marks)

Question 3 - Experimental skills in an unfamiliar context
Explain why vernier callipers are unsuitable for measuring the width of a stream of water. (1 mark)
Calculate the value of the integer $n$. (2 mark)
Explain how the value of $s$ could be calculated. (1 mark)
Find the units of $s$. (1 mark)

Maximum mark: 55

How many marks do you guys think 43/50 will be in the ISA? It was the one about the pendulum SHM

How many UMS marks would 40/55 be for the EMPA?


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