The Student Room Group

AQA Physics Unit 2 - Unofficial Markscheme

thought i would get one actually filled in so:
in red are the questions/answers i can't remember

TOTAL MARKS REMEMBERED : 56/60


1. BALL IN OIL QUESTION [5]
What could go wrong? [1]

•

She could start/stop the stopwatch at the wrong time

When was the timer started and why? [2]

•

Before

•

Because it took longer than expected

Another question here?

•

?

Why has the ball reached its terminal velocity? [2]

•

Its weight became equal to its drag

Did the ball in warmer oil or cooler oil go faster to the bottom and why? [2]

•

The ball in the warmer oil reached the bottom fastest

•

??


*

2. RADIATION PARTICLES [10]
What is an alpha particle? [1]

•

A helium nucleus (two protons and two neutrons)

Which is the least ionising? [1]

•

Gamma waves

What happens to the ion when it is ionised? [1]

•

It loses electrons and becomes a positively charged ion.

What precautions must people who work with radiation take? [1]

•

Wear a film badge / a lead apron / reduce time exposed to radiation

Differences of Alpha, Beta and Gamma [6]

•

Alpha has the smallest range in air and can penetrate very little, deflects to the negative side of a magnetic field

•

Beta has a medium range in air and can penetrate substances up to aluminium, deflects to the positive side of a magnetic field

•

Gamma has the largest range in air and can penetrate substances up to lead. it does not have a charge so doesn't deflect in a magnetic field

*

3. CIRCUITS QUESTION [8]
Which one of the diagrams shows 4.5V in the cells? [1]

•

It was the diagram with two facing the same way on the top part and one seemingly facing the other way on the lower part (if you went around the circuit they actually worked in the same direction)

What would the voltage of the circuit be? [2]

•

9V + 3V = 12V

•

Because voltage is shared in a series circuit

Where would the ammeter go? [1]

•

Could put it anywhere as long as it was not in parallel

What resistance was the fixed resistor and why? [2]

•

600 Ohms

•

Both resistors had a voltage of 6V when the variable resistor was at 600 ohms and have an equal current, so throw ohm's law they must have the same resistance

What was the current when the resistance of the variable resistor was 200 ohms? [2]

•

0.015 A

*

4. MAINS ELECTRICITY [8]
What are the materials inside a plug? [4]

•

Pins are brass because they conduct electricity

•

Casing is plastic because it is an insulator

Which wire is connected to the fuse? [1]

•

Live Wire

How do the fuse and earth wire work together? [2]

•

The large current travels through the earth wire and sends the current towards the earth

•

The large current melts the fuse and breaks the circuit

How does the current affect the wire? [1]

•

It increases its temperature

*

5. SPRING EXTENSION QUESTION [9]
Which energy is it stored as? [1]

•

Elastic Potential

How do you know it is still in the limit of proportionality? [1]

•

The line is still directly proportional

What is the spring constant of the spring? [2]

•

You could use any point of the graph and get 400

•

Unit: N/m

What is the force for all three springs? [1]

•

300N

What power did the boy produce (chin up question)? [4]

•

Had to use the gravitational potential formula to find the energy

•

Then you multiplied that number by 12 (number of chin ups) and used to power formula

•

52W

*

6. SPACE QUESTION [8]
How does a star form? [2]

•

Dust and gas spiral together through the force of gravity and form a protostar

•

Kinetic energy is produced and the star starts to glow and undergo fusion

What is nuclear fusion? [2]

•

When two smaller nuclei join together to form a larger nucleus

Question here? [?]

•

?

Why can they now see brown dwarfs? [1]

•

New technology developments (i.e new telescopes)

The scientists in the 18th century believed discs formed around stars which eventually became planets.
What would this theory suggest about the rest of the universe? [1]

•

Other stars would have planets orbiting around them

What does the proof of discs forming around a star do? [1]

•

Prove that the theory is true

Our planet contains elements heavier than iron, how does this show the earth was formed from a star? [1]

•

Elements heavier than iron are only produced from the nuclear fusion of very large stars that become supernovas

*

7. JETPACK QUESTION [6]
What is happening to? [1]

•

It is at a terminal velocity (the force gravity is equal to the force of the water)

What is his weight? [3]

•

84kg (can't remember details of this question)

The upwards force of the man was 1850N, what was the acceleration? [2]

•

12

•

Unit: m/s^2

*

MISPLACED QUESTIONS + ANSWERS

There was a question with two graphs where you had the choice of greater than / less than / equal to ?
There was another question where it asked what the distance/time graph showed about the speed?


CREDIT:

Spoiler

(edited 7 years ago)

Scroll to see replies

what precautions must people take when working with radioactive substances?
ans: either wear a film badge or a lead apron
Thankyou, Better than the attempts to make one :')
Original post by aggressively
what precautions must people take when working with radioactive substances?
ans: either wear a film badge or a lead apron


Film badge??? I said radioactive thermometer :')
Do you think I would lose a mark for saying minimise time exposed to radiation
Reply 5
Avatar for Akila1
Akila1
2
84kg
22m/s2
0.015A
Reply 6
Avatar for lily628
lily628
OP
4
Original post by Akila1
84kg
22m/s2
0.015A


hey thanks, do you remember what the questions were to this?
Reply 7
Avatar for lily628
lily628
OP
4
Original post by chelseafc141
Do you think I would lose a mark for saying minimise time exposed to radiation


no i think that's reasonable, it didn't say it had to be a physical object
Reply 8
Avatar for Akila1
Akila1
2
Original post by lily628
hey thanks, do you remember what the questions were to this?


Erm, not too sure
The acceleration one was 3 marks
The mass one was also 3 marks
The current one was 2 marks I believe
Reply 9
Avatar for Akila1
Akila1
2
Supernova: elements heavier than iron are only created during one.
The presence of heavier elements provides strong evidence for the theory.
Ionisation: loses electrons and becomes a positively charged ion.
Fuse and earth wire; large current travels through earth wire and to the earth, this surge in current melts the fuse, disconnecting the live supply.
(edited 7 years ago)
Reply 10
Avatar for lily628
lily628
OP
4
Original post by Akila1
Supernova: elements heavier than iron are only created during one.
The presence of heavier elements provides strong evidence for the theory.
Ionisation: loses electrons and becomes a positively charged ion.
Fuse and earth wire; large current travels through earth wire and to the earth, this surge in current melts the fuse, disconnecting the live supply.


thank you !!
Reply 11
Avatar for Yusuf90
Yusuf90
4
For the ball bearing section there was a question on how it reaches its terminal velocity (3 marks)
Question about how the resistor increases temperature and reduces current through the wire (1 mark)
You can add them in :smile:
Repped you purely for having the motivation to try and finish a mark scheme rather than putting the title of the question sections. No names
Reply 13
Avatar for Ferg.
Ferg.
1
Original post by Akila1
84kg
22m/s2
0.015A


Which question gave you the answer 22m/s and which question gave you 0.015A
For the exposure to radiation question, would I get a mark for saying 'work behind a lead screen' (was thinking of P3)
Also, for the supernova question, would I get any credit for noting that elements heavier than iron cannot be fused in the sun?
i didnt get the question about when the timer was started, i got a multiple answer question not an actual number
wasn't the current question 0.006A because you had to take into account that there was twelve VOLTS instead of three?
For 6. 2) The springs constant. You could use any point on the graph to find the constant. The value was 400.
Reply 18
Avatar for lily628
lily628
OP
4
Original post by Everydaygent
Repped you purely for having the motivation to try and finish a mark scheme rather than putting the title of the question sections. No names


lol thanks!

Original post by Zapperzook
For the exposure to radiation question, would I get a mark for saying 'work behind a lead screen' (was thinking of P3)
Also, for the supernova question, would I get any credit for noting that elements heavier than iron cannot be fused in the sun?


i think so, bc they must know loads of people do p2 + p3

Original post by greenapple10
wasn't the current question 0.006A because you had to take into account that there was twelve VOLTS instead of three?


im not sure, do you remember the exact question?

Original post by Everydaygent
For 6. 2) The springs constant. You could use any point on the graph to find the constant. The value was 400.


ahh thank you!
Original post by lily628
lol thanks!



i think so, bc they must know loads of people do p2 + p3



im not sure, do you remember the exact question?



ahh thank you!


no but i remember it saying 200 ohms, and at 200ohms, there was 9v and 3v aswell...

Quick Reply

Related discussions

Latest

Trending

Trending

Articles for you