# Fossil Fuel and Mark

Pages: 11 (1817 words) Published: May 30, 2013
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For Examiner’s Use

General Certificate of Secondary Education June 2007 SCIENCE B Unit Physics P1 PHYSICS Unit Physics P1 Foundation Tier Monday 25 June 2007 9.00 am to 9.45 am PHY1F

F
For Examiner’s Use
Question Mark Question Mark

For this paper you must have: a ruler. You may use a calculator.

Time allowed: 45 minutes Instructions Use blue or black ink or ball-point pen. Fill in the boxes at the top of this page. Answer all questions. Answer the questions in the spaces provided. Do all rough work in this book. Cross through any work you do not want to be marked. Information The maximum mark for this paper is 45. The marks for questions are shown in brackets. You are expected to use a calculator where appropriate. You are reminded of the need for good English and clear presentation in your answers. Advice In all calculations show clearly how you work out your answer.

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Examiner’s Initials

(JuN07PHY1F01)

G/K21760

6/6/6/6/6

PHY1F

2 Answer all questions in the spaces provided.

LEAVE MARGIN BLANK

1 The diagram shows how electricity gets from power stations to consumers.

Transmission cables Power station Consumer Step-up transformer Step-down transformer

(a) Complete the following sentences by drawing a ring around the correct line in each box. (i) The network of cables and transformers linking power stations to consumers is called the national grid line network . (1 mark) (ii) A step-up transformer decreases voltage increases current increases voltage . (1 mark) 230 V 25 000 V 400 000 V

(iii) Electricity is supplied to consumers’ homes at

. (1 mark)

(iv) Making the current in the cables smaller will energy lost in the cables.

increase make no difference to reduce

the (1 mark)

(02)

G/K21760/Jun07/PHY1F

3 (b) Transformers always waste some energy. (i) What effect does the waste energy from a transformer have on the air around the transformer? .................................................................................................................................... (1 mark) (ii) Which one of the following describes the efficiency of a transformer? Draw a ring around your answer. always 100 % less than 100 % more than 100 % (1 mark)

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____

6

Turn over for the next question

Turn over

(03)

G/K21760/Jun07/PHY1F

4 2 Much of the world’s electricity is generated in power stations that burn fossil fuels. (a) The bar chart shows the start-up times for the three types of fossil fuel power station.

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3

2 Start-up time in days 1

0

Coal Gas Oil Type of power station

Which of these power stations would take the longest to start generating electricity? ............................................................................................................................................. (1 mark) (b) Which two of the following statements are good reasons for using fossil fuels to generate electricity? Put a tick ( ) in the box next to each of your choices. Supplies of fossil fuels are limited.

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

Fossil fuels can be used to generate electricity at any time. Fossil fuels are non-renewable.

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A few large power stations can generate the electricity for a million homes. Burning fossil fuels produces carbon dioxide.

.......................................................... (2 marks)

(04)

G/K21760/Jun07/PHY1F

5 (c) Electricity can be generated using energy from the wind. (i) Why does a wind-powered generator not produce carbon dioxide?...