2025 OCR AS Level Physics B (Advancing Physics) H157/02 Physics in depth Combined Question Paper & Final Marking Scheme

2025 OCR AS Level Physics B (Advancing Physics) H157/02 Physics in depth
Combined Question Paper & Final Marking Scheme



Oxford Cambridge and RSA


Wednesday 21 May 2025 – Afternoon
AS Level Physics B (Advancing Physics)
H157/02 Physics in depth
Time allowed: 1 hour 30 minutes
*1880048211*




You must have:
• the Data, Formulae and Relationships Booklet
You can use:
• a scientific or graphical calculator
• a ruler (cm/mm)




* H 1 5 7 0 2 *




Please write clearly in black ink. Do not write in the barcodes.

Centre number Candidate number


First name(s)

Last name


INSTRUCTIONS
• Use black ink. You can use an HB pencil, but only for graphs and diagrams.
• Write your answer to each question in the space provided. If you need extra space use
the lined page at the end of this booklet. The question numbers must be clearly shown.
• Answer all the questions.
• Where appropriate, your answer should be supported with working. Marks might be
given for using a correct method, even if your answer is wrong.

INFORMATION
• The total mark for this paper is 70.
• The marks for each question are shown in brackets [ ].
• Quality of extended response will be assessed in questions marked with an asterisk (*).
• This document has 20 pages.

ADVICE
• Read each question carefully before you start your answer.




© OCR 2025 [601/4744/1] OCR is an exempt Charity
DC (PQ/CB) 354593/3 Turn over

, 2
Section A

1 A student carries out an experiment to determine the electromotive force (e.m.f.) and the internal
resistance of a cell. Fig. 1.1 shows the circuit the student uses.

Fig. 1.1




A V




The student changes the resistance of the variable resistor and measures corresponding values
of current through and potential difference across the variable resistor.

The graph in Fig. 1.2 shows the student’s results.

Fig. 1.2

1.60


1.50


1.40


1.30
Potential
difference 1.20
/V
1.10


1.00


0.90

0.80
0.00 0.10 0.20 0.30 0.40 0.50
Current / A




© OCR 2025

, 3
(a) The student concludes that the e.m.f. of the cell is 1.5 V and that its internal resistance is 1.2 Ω.
Explain how the student reaches these conclusions. Include any relevant calculations.

..........................................................................................................................................................

..........................................................................................................................................................

..........................................................................................................................................................

..........................................................................................................................................................

..........................................................................................................................................................

..........................................................................................................................................................

..........................................................................................................................................................

......................................................................................................................................................[4]

(b)
(i) Show that when the current is 0.40 A the number of electrons passing through the variable
resistor each second is 2.5 × 1018.




[2]

(ii) Calculate the energy transferred by one electron as it travels from one end of the variable resistor
to the other when the current is 0.40 A.




Energy transferred = ...................................................... J [3]




© OCR 2025 Turn over

, 4
2 A student carries out an experiment to verify Newton’s 2nd law of motion. Fig. 2.1 shows
equipment used by the student.

Fig. 2.1

100 g masses
Trolley Pulley
String




Runway Falling mass


The student follows these instructions:

• Measure the mass of the trolley.
• Place the trolley on the runway without the falling mass and compensate for the friction of
the wheels.
• Connect the falling mass to the trolley, and with no masses on the trolley release it from rest
at the top of the runway and time how long it takes to travel 1 m with a stopwatch.
• Repeat the experiment two more times and calculate the mean time.
• Repeat the experiment with different numbers of 100 g masses on the trolley.

(a) Explain how the student compensates for the friction of the wheels.

..........................................................................................................................................................

..........................................................................................................................................................

..........................................................................................................................................................

......................................................................................................................................................[2]

(b) The mass of the trolley is 750 g. With 200 g placed on top of it, the mean time taken for the trolley
to travel 1.00 m from rest is 2.2 s.
Show that the acceleration of the trolley is about 0.41 m s–2.




[1]




© OCR 2025