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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)…

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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 =…

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Answer all the questions.
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…

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(b) 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.


1 year saving on fuel
model of cost to buy gas
efficiency (%) costs compared to…

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2 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…

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3 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…

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4 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…

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(b) 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
Made in China


The…

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(c) 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…

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5 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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