# OCR GATEWAY PHYSICS B1,2,4

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• Created on: 09-05-12 19:32

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SPECIMEN H
GENERAL CERTIFICATE OF SECONDARY EDUCATION
GATEWAY SCIENCE B751/02
PHYSICS B
Unit B751: Physics module P1, P2, P3 (Higher Tier)
Candidates answer on the question paper
A calculator may be used for this paper
OCR Supplied Materials: Duration: 1 hour 15 minutes
None
Other Materials Required:
Pencil
Ruler (cm/mm)
Candidate Candidate
Forename Surname
Centre Number Candidate Number
INSTRUCTIONS TO CANDIDATES
Write your name clearly in capital letters, your Centre Number and Candidate Number in the boxes
above.
Use black ink. Pencil may be used for graphs and diagrams only.
Read each question carefully and make sure that you know what you have to do before starting your
Write your answer to each question in the space provided, however additional paper may be used if
necessary.
INFORMATION FOR CANDIDATES Examiner's Use
Your quality of written communication is assessed in questions marked with Only:
a pencil ().
1 9
A list of equations can be found on page 2.
The number of marks for each question is given in brackets [ ] at the end of 2 10
each question or part question. 3 11
The total number of marks for this paper is 75.
This document consists of 28 pages. Any blank pages are indicated. 4 12
5 13
6 14
7 15
8
Total
© OCR 2011 [QN 600/1149/X] OCR is an exempt Charity Turn over

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EQUATIONS
energy = mass × specific heat capacity × momentum = mass × velocity
temperature change
change in momentum
force =
time
energy = mass × specific latent heat
GPE = mgh
useful energy output (100%)
efficiency =
total energy input
mgh = 1
2 mv2
wave speed = frequency × wavelength
voltage
resistance =
current
power = voltage × current
v = u + at
energy supplied = power × time
v2 = u2 + 2as
distance
average speed =
time

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Section A ­ Module P1
1 Asif has an old gas fire that heats the living room of his house.
(a) The label on the gas fire states that it is 60% efficient.
The energy in a year's gas supply for the fire is 1500 MJ.
Draw a Sankey diagram for Asif's gas fire.

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Asif changes his old gas fire for a new one because he thinks a more efficient fire will save
him money.
Look at the data in the table about new gas fires.…read more

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Sue looks up some information about the specific latent heat of water.
change of state specific latent heat in kJ/kg
melting 334
vaporisation 2260
Sue is heating a 100g of ice.
Look at the graph.
It shows Sue's results.
temperature
A B
100oC
0oC
time
(a) Calculate the energy which is supplied to the water between points A and B on the graph.
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(b) Energy is supplied between A and B.
Explain why the temperature of the water does not change.…read more

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Energy losses in the home can be reduced by energy saving measures.
One measure is to put foam covered with shiny foil as insulation in the cavity.
cavity
foam containing air in cavity
shiny foil
inner block wall outer brick wall
direction of energy loss
Describe how energy is lost through the wall from the inside to the outside and how the
insulation reduces the different types of energy loss.
The quality of written communication will be assessed in your answer to this question.

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This question is about electromagnetic waves.
Look at the information about three types of electromagnetic waves.
type wavelength range in m energy range in J
A ........................ 7 x 10-7 to 1 x 10-3 2 x 10-22 to 3 x 10-19
microwave 1 x 10-3 to 1 x 10-1 3 x 10-24 to 2 x 10-22
B ........................ > 1 x 10-1 < 3 x 10-24
(a) Fill in the two gaps in the table labelled A and B.…read more

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Microwaves are part of the electromagnetic spectrum.
Microwave radiation is used in cooking and also in communications.
David reads the label on the back of his microwave oven.
Stainless Steel Microwave Oven
Model MMSO8
230-240V
Input power 1200W
Microwave frequency 3.44 X 109 Hz
The speed of microwaves is 3.00×108 m/s.
(i) Use the information on the label to calculate the wavelength of these microwaves.
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Lucy's father is deciding whether or not to buy her a mobile phone.
He is concerned that there may be health risks associated with using a mobile phone.
Give an example of a potential health risk and describe how Lucy's father should evaluate
the risks when making his decision.
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The Montreal protocol in 1987 set up an international agreement to phase out the use of CFCs.
Explain why this ban on the use of CFCs is necessary and why it had to be internationally
agreed.
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