OFFICIAL AQA GCSE PHYSICS 23rd May 2013 MARK SCHEME

i also put real and inverted

I think he meant 20V?

1) Diagram of eye (2 marks)
1b) Complete table (3 marks)
1c) Near point. What can you conclude from the data (2 marks)
1d) Suggest how data obtained could be improved (1 marks)
1e) Focal length = 40cm calculate power of lens (2 marks)

2) Compare stability of two rafts (2 marks)
2b) Complete ray diagram (4 marks)
2c) Two words to describe nature of image produced by the lens in the camera (2 marks)

3*) Describe the features of ultrasound and x-rays, and what happens when each type of wave entres the human body (6 marks)
3b) Explain why its not safe to use x-rays to produce image of an unborn child (2 marks)
3c) Give one use of ultrasound for medical treatment (1 marks)

4a) What property of liquid enables a hydraulic brake system to work? (1 marks)
4b) Calculate force exerted on the liquid by the master piston? (2 marks)
4c) How does the size of this force compare to force f made by the master piston?...
Give a reason for your answer... (2 marks)

5) G-Machine question.
Name of force...
Direction of force... (2 marks)
5b) State 3 conclusions that can be made from the graph (3 marks)
The speed of G-machine 1 is increased form 20m/s to 40m/s
Change in force? (1 marks)
5c) Explain why side A experiences a force (2 marks)
Draw arrows of the force acting on A and C (1 marks)
When horizontal, side b experiences no force...why? (1 marks)
5d) What can the operators do to make the G-machine rotate faster? (1 marks)
5e) Do you think we should spend money on space exploration? Yes or No? (1 marks)

6) Calculate the upwards force the man applies to the handle of his bag? (2 marks)
6b) When the man lets go of the bag handle, the bag falls and hits the floor. Why? (2 marks)
6c) Pendulum makes 10 complete swings every 160 seconds. Frequency + Unit) (3 marks)

7a) The alternating current flowing through the primary coil of the transformer creates an alternating current in the secondary coil? Why? (3 marks)
7b) Potential difference the charger supplies to the laptop? (2 marks)
Calculate the current in the primary coil? (2 marks)
7c) Give one other advantage of the switch mode transformer? (1 marks)
7d) Suggest one advantage of developing these batteries?

Phew! There you go
Apologies for any typo's.

I said real and inverted is this right

Hey all - can anybody remember the numbers involved for the question on the force calculation with the master piston (4b)? Much appreciated (I do remember that they used standard form incorrectly for one of the numbers though - 14.4 x10 to the minus something I believe - stupid AQA!)

84 n

Hopefully the exam went well for you all. Please post to add to the mark
scheme.
QUESTIONS:
1) Diagram of eye (2 marks)
1b) Complete table (3 marks)
1c) Near point. What can you conclude from the data (2 marks)
1d) Suggest how data obtained could be improved (1 marks)
1e) Focal length = 40cm calculate power of lens (2 marks)


2) Compare stability of two rafts (2 marks)
2b) Complete ray diagram (4 marks)
2c) Two words to describe nature of image produced by the lens in the camera (2 marks)


3*) Describe the features of ultrasound and x-rays, and what happens when each type of wave entres the human body (6 marks)
3b) Explain why its not safe to use x-rays to produce image of an unborn child (2 marks)
3c) Give one use of ultrasound for medical treatment (1 marks)


4a) What property of liquid enables a hydraulic brake system to work? (1 marks)
4b) Calculate force exerted on the liquid by the master piston? (2 marks)
4c) How does the size of this force compare to force f made by the master piston?...
Give a reason for your answer... (2 marks)


5) G-Machine question.
Name of force...
Direction of force... (2 marks)
5b) State 3 conclusions that can be made from the graph (3 marks)
The speed of G-machine 1 is increased form 20m/s to 40m/s
Change in force? (1 marks)
5c) Explain why side A experiences a force (2 marks)
Draw arrows of the force acting on A and C (1 marks)
When horizontal, side b experiences no force...why? (1 marks)
5d) What can the operators do to make the G-machine rotate faster? (1 marks)
5e) Do you think we should spend money on space exploration? Yes or No? (1 marks)


6) Calculate the upwards force the man applies to the handle of his bag? (2 marks)
6b) When the man lets go of the bag handle, the bag falls and hits the floor. Why? (2 marks)
6c) Pendulum makes 10 complete swings every 160 seconds. Frequency + Unit) (3 marks)


7a) The alternating current flowing through the primary coil of the transformer creates an alternating current in the secondary coil? Why? (3 marks)
7b) Potential difference the charger supplies to the laptop? (2 marks)
Calculate the current in the primary coil? (2 marks)
7c) Give one other advantage of the switch mode transformer? (1 marks)
7d) Suggest one advantage of developing these batteries?

ANSWERS:


Q1- a) cornea and retina,
b) (i)Pupil/iris
(ii) ciliary muscle changes shape of lens,
(iii)lens changes shape to focus light from various distances.
(5 marks)

Q2- a)
b)
c) 2.5 D
(5 marks)

Q3- a) 6 mark x-rays
b) why x-rays are unsafe on fetus
c) use of ultrasound (kidney stones) .
(9 marks)

Q4- a) hydraulic pressure in liquid, work out pressure, is force bigger.
(5 marks)

Q5) a) space question- where the astronaut travels and the force, 3 conclusions, graph quesion, how motor works in thing, how it moves (arrows), is space exploration worth it, something else. 12 marks

Q6- a) Boat A had lower centre of mass and wider base(
b) why suitcase is stable
c) 1 Oscillation every 16 seconds
Formula was frequency=1/time period
so 1/16= 0.0625
(7 marks)

Q7 a) ray diagram (4),
b) Real, inverted and diminished (2)
(6 marks)

Q8) a) how transformer works (3), voltage is 20, amps is 0.3, advantage of switch mode, advantage of battery,.
(9 marks)

Sorry, if I take long to put up answers, got Exam tomorrow morning! I'll be getting them to you ASAP

are you 100% sure that the draw the arrows question was only 1 mark?

are you 100% sure that the draw the arrows question was only 1 mark?

Yes, i have the paper in front of me right now

'The draw arrows on the diagram to show the direction of the forces acting on A and C of the coil' is just one mark.
See post #46.

Not him but it definitely was. What else would they mark you on?

Not him but it definitely was. What else would they mark you on?