intermediate 1 physics – REVISION QUESTIONS

1 / On Easter Monday Jack went to an electrical superstore with his family.
a) / In the communications section of the store Jack picked up a radio and showed it to his mother. He described the various parts of the radio to his mother.
i) / Complete the table to show the information Jack gave to his mother. / 5
The name Jack gave to each part of the radio. / Jack’s description of what that part does when the radio is working.
It picks up lots of radio waves.
Tuner
Decoder / It separates the sound signal from the radio signal.
Amplifier
Loudspeaker
ii) / Jack’s mother pointed to the tuner on the radio and asked him about all the numbers on it. Jack told his mother that these were the frequencies of the different radio stations.
What is the unit of frequency?
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b) / Jack and his mum decide to buy the radio. The assistant at the checkout asks if they want to buy batteries for it. Give one reason why the radio will need batteries.
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2. / A school technician is given an old radio and asked to check if it is working properly. She collects a block circuit diagram of the radio from her filing cabinet but finds that some of the names on the diagram have faded away. The missing names are labelled P and Q in figure 1 below.

figure 1
a) / Name parts P and Q of the radio.
P
Q / 2
b) / The technician connects an oscilloscope to point X and then to point Y to test the electrical signals at these points. The signal at X is as shown on oscilloscope X in figure 2. Draw on oscilloscope Y, the signal you would expect at Y if the radio is working properly.

figure 2 / 2
c) / The power of the signal received by the aerial is very small but the power of the loudspeaker is much larger.
What provides the extra power?
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3. / Jane received a new games console at Christmas. Her parents told her to read up on television stations and to read the games console instructions before connecting it to their television.
a) / Jane first collected a copy of a Radio and TV magazine. Two bits of information from this magazine are listed below.
Radio Clyde ( FM stereo ) / 102 000 000 hertz
BBC 1 Television / 690 000 000 hertz
i) / Which word in the table gives the name of the unit of frequency?
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ii) / Which signals are broadcast at a higher frequency, TV or Radio?
1
3 / b) / Jane connected her games console to the television as shown in figure 1 below but the television did not give a picture of the game Jane wanted to play.

figure 1
Jane decided that her TV was not set to the correct channel for the games console. The Radio and TV magazine gave the following information on some of the TV channels.
TV station / Channel number / Frequency in megahertz
ITV / 25 / 600
BBC 2 / 28 / 630
Ch 4 / 31 / 660
BBC 1 / 34 / 690
Ch 5 / 37 / 720
The instruction book states that the console sends a 670-megahertz signal to the television.
i) / Which TV station has the closest frequency to that of the games console?
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ii) / What channel number should be selected on the TV to obtain a clear picture from the games console?
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3. / c) / Jane uses the channel button on the TV remote control to change the channel and get a clear picture of the game. The remote control sends invisible rays to a sensor on the TV that responds by selecting the channel required. Name these invisible rays.
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d) / Jane finally adjusts the colour on the TV before settling down to play her new computer game.
Name the three colours of light given out by the TV screen to produce the many colours seen in the computer game?
3
4. / Mrs Jones looked out of her window and saw a satellite-receiving dish being installed on her neighbour’s wall.

figure 1
The installation engineers take great care to point the receiver towards a geostationary satellite.
a) / What is a satellite?
1
b) / Explain what is meant by geostationary.
1
c) / Figure 2 shows signals from the satellite coming towards the curved dish on the wall. Complete figure 2 to show what happens to the signals after they hit the curved dish.

figure 2 / 2
d) / How do the signals get from the receiving dish to the T.V. in the house?
1
e) / It is recommended that people living northern Scotland should use a
90-centimetre diameter dish, while those living in south-east England only need a 60-centimetre diameter dish.
i) / State one advantage of having a 90 centimetre dish rather than a 60 centimetre dish.
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ii) / What does this suggest about the satellite signals received in northern Scotland?
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5. / Computers in schools are often networked together in some way to share a printer. Figure 1 shows two rooms, A and B, which have been networked. A is networked with copper wires and B with optical fibre connections.

Figure 1
a) / Give one advantage of using optical fibres compared with copper wires for communication.
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b) / Give one disadvantage of using optical fibres compared with copper wires for communication.
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c) / i) / In which network do the signals travel faster to the printer?
1
ii) / Give a value for the speed of the faster signals
1
d) / How would the computer user know that there was a difference in the speed of the signals from the computer to the printer?
1
6. / An enthusiastic pupil opens up the handset of an old disconnected telephone. He ends up with some screws, pieces of wire, a small microphone and a small loudspeaker.
a) / He then attempts to put it back together. Fill in the two empty parts of the table below, to show which part goes where in the handset.
Name of part. / Where it goes in the handset / 2
Into the earpiece.
Into the mouthpiece.
b) / State the energy change in the loudspeaker.
1
c) / State the energy change in the microphone.
1
d) / Name the type of wave which carries the signals in a mobile phone system
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7. / a) / On his day off, Mr Black paid a visit to a Telecommunications shop. He saw a wide selection of simple telephones, mobile phones and combined telephone and fax machines.
i) / What kind of communication is sent by fax?
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ii) / Why do mobile phones not need wires to communicate with each other?
1
iii) / At what speed do telephone signals travel along metal wires?
1
b) / Mr Black is a science teacher. When back at work he connects a telephone handset to an oscilloscope. He asks a pupil to whistle a steady note into the mouthpiece of the telephone handset. Figure 1 shows the pattern the oscilloscope produces.

figure 1

figure 2
The pupil now whistles a note which is quieter and has a higher frequency. On figure 2 sketch the pattern that is now obtained. / 2

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