# The energy unit measured by the electricity meter in your home is the

The energy unit measured by the electricity meter in your home is the
A kilowatt-hour B ampere C watt D coulomb E volt.

The correct answer is Akilowatt-hour. The answer A has been clearly marked in pencil with a horizontal line (see below). A B C D E

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SECTION A Answer questions 120 on the answer sheet. 1. Which three colours are used to produce a white area on a television screen? A Blue, green and yellow B Blue, green and red C Yellow, blue and green D Yellow, green and red E Blue, red and yellow 2. Television signals from a satellite are received by a curved reflector as shown.

curved reflector

signal

aerial

A curved reflector is used to A make the signal received at the aerial stronger B protect the aerial from the wind C select one signal from the many signals received at the reflector D convert electrical energy into light energy E convert light energy into electrical energy.

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3. A student directs a ray of light onto a mirror. mirror

ray of light Which line on the diagram shows the ray after reflection? mirror E

A B C

D

4. A student makes the following statements about optical fibres. I Optical fibres transmit light signals at a speed of 200 million metres per second. II Optical fibres are used for telecommunication links. Optical fibres are used mainly to transmit sound signals. III

Which of the statements is/are true? A I only B I and II only C I and III only D II and III only E I, II and III

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5. A microphone and loudspeaker are parts of a telephone. Which row in the table shows the useful energy change in the microphone and the loudspeaker? Energy change in the microphone A B C D E 6. Which circuit shows resistors P and Q connected in parallel with each other? A P B sound to light electrical to sound sound to electrical sound to electrical electrical to sound Energy change in the loudspeaker light to sound electrical to sound electrical to sound sound to electrical sound to electrical

Q

R R

P

Q

C P

D P R R Q Q

E P Q

R

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7. A circuit is set up as shown.

A

V The reading on the ammeter is 3·0 amperes. The reading on the voltmeter is 12 volts. The resistance of the variable resistor is now increased. Which row in the table gives possible new readings on the ammeter and voltmeter? Reading on the ammeter in amperes A B C D E 8. A circuit is set up as shown. 2 2 3 3 4 Reading on the voltmeter in volts 12 14 14 12 12

The energy change in the resistor is A electrical to heat B electrical to light C heat to electrical D light to electrical E electrical to sound.

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9. A circuit is set up as shown. 3 ampere fuse 3·0 volts

A copper rods

1000 ohm resistor

A student holds a copper rod in each hand and notes the reading on the ammeter. Which of the following produces a larger reading on the ammeter? A Changing the 3·0 volt battery to a 1·5 volt battery B Changing the 1000 ohm resistor to a 2000 ohm resistor C Repeating the experiment with wet hands D Replacing the ammeter with a voltmeter E Changing the fuse to a 5 ampere fuse 10. Which of the following best describes a laser beam? A A narrow beam of white light B A wide beam of white light C A wide beam of red light D A narrow beam of green light E A wide beam of green light 11. The diagram shows light rays from a far away object entering a person’s eye. Y

rays of light

V

W

X

Z The person is short sighted. The light rays would focus at A point V B point W C point X D point Y E point Z. [X069/10/02] Page seven [Turn over

12. In the following passage, three words have been replaced by the letters X, Y and Z. Gamma radiation is X to the naked eye. Gamma radiation Y kill living cells. The strength of a source of gamma radiation Z with time. Which row in the table gives the correct words for X, Y and Z? X A B C D E visible invisible visible visible invisible Y can cannot can cannot can Z increases decreases decreases increases decreases

13. An electronic keyboard is connected to a speaker. A key is pressed to produce a note of 400 hertz. Another key is now pressed to produce a note one octave higher. The frequency of the new note is A 600 hertz B 800 hertz C 1000 hertz D 1200 hertz E 1600 hertz. 14. A student makes the following statements about how the frequency of a vibrating string can be increased. I Make the string longer. II Make the string shorter. Make the string tighter. III

Which of the statements is/are correct? A I only B II only C III only D I and III only E II and III only

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15. An alarm clock is inside a jar as shown. rubber stopper string
10 9 8 7 6 5 11 12 1 2 3 4

glass

to vacuum pump The sound from the alarm is heard clearly. All of the air in the jar is now pumped out. The alarm cannot be heard clearly because sound cannot pass through A the string B a vacuum C the glass D air E the rubber stopper.

16. Five cars are acted on by different forces. Which car is speeding up to the right?

A

1000 newtons

2000 newtons

B

2000 newtons

1000 newtons 1000 newtons 1000 newtons

C

2000 newtons

D E

1000 newtons 1000 newtons 1000 newtons

1000 newtons

2000 newtons

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17. A ball is kicked at an angle x as shown.

x The angle is then changed. The graph shows how the horizontal distance travelled by the ball changes as the angle is changed. Horizontal distance travelled in metres 14 12 10 8 6 4 2 0 0 10 20 30 40 50 60 70 80

Angle in degrees The ball travels the greatest horizontal distance when it is kicked at an angle of A 15 degrees B 40 degrees C 45 degrees D 50 degrees E 75 degrees. 18. Which of the following rows contains two output devices and one input device? A Loudspeaker, lamp, LED B Microphone, LDR, switch C Thermistor, switch, buzzer D Electric motor, buzzer, lamp E Loudspeaker, buzzer, thermistor

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19. Which of the following is a symbol for an OR gate? A B C D E

20. A digital signal is applied to the input of a logic gate as shown.

digital signal

input output logic gate

The output signal from the logic gate is A

B

C

D

E

Candidates are reminded that the answer sheet for Section A MUST be placed INSIDE the front cover of the answer book.

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Marks SECTION B Answer questions 2134 in the spaces provided. 21. Radio stations transmit signals at different frequencies. (a) What is meant by the frequency of a radio signal?

1 (b) The table below lists the frequency of different radio stations. AM (amplitude modulated) Station Clyde 2 Forth Two Frequency (kilohertz) 1152 1548 FM (frequency modulated) Station Argyll Clyde 1 Forth One Real Radio Smooth Radio Waves Radio Frequency (megahertz) 106·5 102·5 97·3 100·3 105·2 101·2

One kilohertz = 1000 hertz One megahertz = 1 000 000 hertz (i) In the sentence below, circle one word in the box to make the statement correct. FM radio stations have a AM radio stations. HIGHER/LOWER frequency than 1

(ii) Which station has a frequency that is between Northsound and Clyde 2?

1

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Marks 22. The Earth rotates once every 24 hours. The table below shows the time taken for a satellite to orbit the Earth at different heights above the surface of the Earth. Time to complete one orbit (hours) 12 18 24 30 Approximate height above the surface of the Earth (kilometres) 20 000 28 000 36 000 44 000

(a) Use the table to find the height, in kilometres, of a Geostationary satellite.

1

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Marks 22. (continued) (b) Using the data in the table, plot a line graph on the grid provided.

45 000 40 000 Approximate height (kilometres) 35 000 30 000 25 000 20 000 15 000 10 000 5 000 0 0 5 10 15 20 25 30 Time (hours) 35 40 2

(c) From the graph find the time it would take for a satellite to orbit that is 30 000 kilometres above the Earth.

1

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Marks 23. Luggage scanners at airports use radiation to check bags before they are put onto aircraft. An image on the TV screen can then show up anything that contains metal.

(a) What type of radiation is used in the luggage scanner?

1 (b) The radiation generator used in the scanner operates at a current of 4·0 amperes and a voltage of 220 volts. Calculate the resistance of this generator.

2

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Marks 23. (continued) (c) Airport body scanners are used to detect whether a person is carrying weapons.

A person going through the scanner receives a radiation dose of 0·03 microsieverts every time it is used. A person could have 5000 scans a year before there would be any risk to their health. (i) Calculate the total radiation dose value, in microsieverts, that would create a health risk to passengers.

2 (ii) The security staff taking the scan sit behind a lead glass screen. What is the purpose of the screen?

1

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Marks 24. A vacuum cleaner and its rating plate are shown below.

Model VCUlUP
230 Volts 50 Hertz 1725 Watts
Mode
230

l VCUI
50

OP

Hertz

Volts

1725

Watts

(a) Calculate the current in the vacuum cleaner when it is switched on.

2 (b) A plug is connected to the flex of the vacuum cleaner. Earth Live Neutral Fuse

Complete the table below to identify the colours of the insulation on the wires inside the plug. Terminal Earth Live Neutral [X069/10/02] Page eighteen 1 Colour

24. (continued) (c) The power rating and fuse values of some appliances are shown in the table below. Appliance Bedside lamp Deep-fat fryer Desktop computer Dishwasher Sandwich maker Television Power (watts) 60 3000 150 1200 1000 300 Fuse value (amperes) 3 13 X Y 13 3 Marks

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(i) State the value of fuse X. amperes

(ii) State the value of fuse Y. amperes 2

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Marks 25. To investigate the resistance of different wires, four wires, W, X, Y and Z are tested in turn. All the wires are the same length.

E wire being tested

D (a) At which position in the circuit should an ammeter be placed, D or E?

1 (b) The table shows the current in each wire. Wire W X Y Z Current (amperes) 0·50 0·60 0·22 0·80

(i) Which wire has the smallest resistance?

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Marks 26. Ultrasound is used to determine the depth of the sea.

reflected sound

transmitted sound

(a) State what the term ultrasound means.

1 (b) A pulse of ultrasound is transmitted and the echo is detected 1·2 seconds later. (i) Calculate the time taken for the pulse of ultrasound to reach the sea bed.

1 (ii) The sea bed is 900 metres below the surface. Calculate the speed of sound in water.

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Marks 27. Rescue workers use thermal imaging cameras to detect people who are trapped in collapsed buildings.

(a) Describe how these cameras detect people trapped in a collapsed building.

1 (b) The camera contains the lens shown below.

(i) Name this type of lens.

1 (ii) Complete the diagram above to show the path of the rays once they have passed through the lens.

1

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27. (continued) (c) The list below gives different types of radiation. Microwaves Infrared X-rays Ultraviolet Visible light

Marks

Use some of these radiations to complete the table. Type of Radiation Application Used to detect flaws in metal structures Gamma rays Can be used as a tracer Helps to speed up muscle healing Can be used to identify security markings on banknotes

2

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Marks 28. A student investigates how musical instruments produce sounds. (a) A guitar is fitted with an electric pick up so that the signal can be amplified. The signal from the pick up to the input of the amplifier is shown on an oscilloscope below.

On the grid below draw the output signal from the amplifier. The settings on the oscilloscope have not been changed.

2 (b) The student wears ear protectors to prevent damage to her hearing. Explain how the ear protectors work.

1

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Marks 28. (continued) (c) Complete the following sentences about sound using some of the words in the list. amplitude decibels energy hertz noise vibrates . Sounds . The and . 2 frequency

Sound is a wave, which transfers are produced when an object frequency of the wave is measured in the loudness of the sound is measured in

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(a) The signal from the singer’s microphone is amplified before being broadcast.

Voltage in = 0·02 volts

amplifier

Voltage out = 5·0 volts

Calculate the voltage gain of the amplifier.

2 (b) A person is listening to the broadcast on a radio receiver. The block diagram below shows the main parts of a radio receiver. Complete the diagram by filling in the missing labels.

Aerial

Decoder

Loudspeaker

Electricity supply

2

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Marks 30. A kitesurfer stands on a small surfboard. The wind exerts a force on the kite moving the kitesurfer across the water.

(a) The kitesurfer travels 750 metres in 60 seconds. Calculate the average speed of the kitesurfer over this distance.

2 (b) The kitesurfer then travels at a constant speed. How do the forces acting on the kitesurfer compare?

1 (c) Later the kitesurfer lifts clear of the surface of the water for a few seconds. The wind speed stays the same but the speed of the kitesurfer increases. Explain this increase in the speed of the kitesurfer.

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Marks 31. A student carries out an experiment to measure the height a tennis ball rebounds to from different surfaces. The student uses a tennis ball and samples of three different types of surface (carpet, laminate, vinyl). Describe a method the student could use to carry out this experiment. Your description should include: AIDitional equipment the student would require.

The measurements the student should make.

How the student would ensure the test is fair.

3

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Marks 32. (a) Complete the sentences below using some of these words. Earth force kilogram newtons weight . 1

Weight is the force due to gravity and it is measured in Weight is the pull of the (b) A ball has a mass of 0·5 kilograms. Calculate the weight of the ball. on an object.

2 (c) The ball rolls down a hill.

There is a force due to friction acting on the ball. In which direction is the force of friction acting?

1 (d) When the ball reaches the bottom of the hill it collides with a stationary ball of mass 1·5 kilograms. After the collision the second ball moves off with a speed of 2·0 metres per second. The second ball is now replaced by another ball of mass 2·5 kilograms and the experiment is repeated. Will the speed of the 2·5 kilogram ball be greater than, the same as or less than 2·0 metres per second?

1

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Marks 33. A freezer in a hospital is used to store medicines at a low temperature. An electronic system is used to sound an alarm when the temperature of the freezer becomes too high.

(a) An electronic system can be represented by a block diagram as shown. Complete the block diagram by filling in the missing labels. Process (b) The electronic system contains some of the components from the list below. buzzer lamp microphone switch thermistor (i) Which device from the list is suitable as a temperature sensor?

1

1 (ii) Which device from the list is suitable for sounding the alarm?

1 (iii) The hospital technician adapts the system to detect someone opening the door of the freezer. Name one input device from the list which is suitable for alerting that the door has been opened.

1

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Marks 33. (continued) (c) A second system uses an LED as a warning device. State the energy change in an LED.

1

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Marks 34. A hospital bed can be raised using an electronic circuit.

A logic diagram for this circuit is shown below.

Pressure switch

A X Z

Master switch

B

Pressure switch when closed gives logic 1 Pressure switch when open gives logic 0 Master switch when closed gives logic 1 Master switch when open gives logic 0 (a) (i) Name logic gate X.

1 (ii) Name an output device which could be used to raise the bed.

1

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Marks 34. (continued) (b) Complete the table for component X. Input A 0 0 1 1 Input B 0 1 0 1 1 Output Z

(c) Explain why the bed cannot be raised when the master switch is off.