2. tick three data logging. -...

Control Revision Questions

1. A traffic survey is being taken on a busy road.

Give two advantages of using a computerised system over using a human to monitor the traffic.

1 ...............................................................................................................................

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2 ...............................................................................................................................

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2. Tick three uses of data logging.

Calculating electricity bills.

Calculating wage slips.

Changing traffic lights.

Counting how many people go through a turnstile.

Keeping the temperature of a room constant.

Recording temperature changes in a science experiment.

Recording the traffic flow at a crossroads.[3]

The Garden International School 1

3. Mr Brown, a Science teacher, is responsible for the monitoring of the school pond to ensure that it remains a safe environment for wildlife. He collects the data using sensors connected to a computer.

DATACONVERTER

Sensors in pondsending data to the computer

Computer in the classroomreceiving the data

(a) Give two reasons why Mr Brown would choose to collect data using the computer rather than collecting it manually.

Reason 1 ........................................................................................................

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Reason 2 ........................................................................................................

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(b) Explain why Mr Brown has to connect the sensors to the data converter box and not directly to the computer.

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4. Peter is using a computer in a science experiment. He leaves a sprig of pond weed in the sun for an hour. He uses the computer to record the number of bubbles given off by the pond weed.

Pond weed giving off bubbles Computer collecting the data

Sensor

(a) Give two advantages of using a computer to record the number of bubbles instead of counting them manually.

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2 ......................................................................................................................[2]

(b) Peter imports the results of the count into a spreadsheet.

A B

1 Time interval (minutes) Number of bubbles

2 0 – 10 0

3 10 – 20 5

4 20 – 30 10

5 30 – 40 12

6 40 – 50 13

7 50 – 60 12

8

9 Total number of bubbles:10


Which cell should Peter put a formula in to calculate the total number of bubbles?

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(c) Write down the most suitable formula for Peter to put into the cell to calculate the total number of bubbles given off.

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(d) Peter makes this chart of his results.

Chart to show number of bubbles

Time interval (mins)

Numberof

bubbles

141210

86420

0 – 10 10 – 20 20 – 30 30 – 40 40 – 50 50 – 60

Describe how Peter made this chart from his spreadsheet of results.

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(e) Peter uses the chart to produce a report in a desktop publishing (DTP) package.Give one way that Peter could put this chart into the report.

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(f) Peter prints out this unfinished version of the report with his graph.

Time interval (mins)

Numberof

bubbles

141210

86420

0 – 10 10 – 20 20 – 30 30 – 40 40 – 50 50 – 60

This is my science report about pond weed.

When the pond weed was in the light it gave off bubbles that were collected by thetest tube. The bubbles were counted by the counter and the numbers sent to thecomputer. My chart is shown here.

For each of the following, give one way in which the presentation of the report could be improved.

(i) The report title .................................................................................................

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(ii) The display of the chart...................................................................................

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5. Tick four items used in an automatic system to control the temperature in a greenhouse.

A computer

Analogue to digital converters

OMR

Temperature sensors

Water

Motors

Temperature control program

[4]

6. A gardener needs to make sure that the plants are kept in the right conditions for their growth. He uses sensors attached to his computer to monitor his greenhouse.

Motor on the window Interface box

Sensors inside the greenhouse Computer

(a) One sensor that he uses is a temperature sensor. Identify two other sensors that could be used to collect data from the greenhouse.

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2 ......................................................................................................................[2]


(b) The electronic data collected from the greenhouse and recorded by the computer is important.Give two ways the loss of the recorded data can be avoided.

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2 ......................................................................................................................[2]

(c) The sensors are connected to the computer via an interface box. Why is this?

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7. A computer company is introducing computer-controlled robots into its production line.

Give two advantages to the company of making this change.

Advantage 1 .............................................................................................................

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Advantage 2 .............................................................................................................

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8. A robot arm has a paint nozzle used to paint shapes on cars.

paintnozzle

The robot arm is controlled by a computer using these instructions.

INSTRUCTION MEANING

REPEAT n [ ] Repeat the instructions in square brackets n times

FORWARD n Move n cm forward

BACKWARD n Move n cm backward

LEFT n Turn left n degrees

RIGHT n Turn right n degrees

OFF Stop paint flow

ON Start painting


The robot arm is programmed to paint these shapes on the car:

It starts painting at .

Complete the program sequence below to paint the shapes on the car:

ONFORWARD 40OFFBACKWARD………………RIGHT 90……………FORWARD 40OFFFORWARD 20…………… 90ONREPEAT …………… […………… ......... RIGHT 90]

[6]


9. A computer system uses sensors to monitor the water in a school swimming pool.

interface box

(a) Explain why the sensors are connected to the interface box and not directlyto the computer.

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(b) State one disadvantage of using a computer system to monitor the water.

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(c) The data from the sensors is collected and stored by the computer.Describe how the collected data could be used.

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(d) A robot is used to clean the bottom of the pool.

Name one suitable sensor that could be placed on the robot and explain how it could be used to help guide the robot around the pool.

Sensor............................................................................................................

Use.................................................................................................................

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10. (a) A microprocessor is used to control traffic lights at pedestrian crossings. Here is a sequence of some of the instructions to the microprocessor. They are in the wrong order.

Number Instruction

1 Turn WALK sign OFF

2 Start sequence when BUTTON PRESSED by pedestrian

3 Turn WALK sign ON

4 Turn WAIT sign OFF

5 Cross NOW beeper SOUNDS

6 Turn RED traffic light ON to stop traffic

7 Turn WAIT sign ON

Write down the correct order of the instructions for when a pedestrian presses the control box button. The first one is done for you.

Number

2

[3]

(b) Identify two labour-saving devices containing microprocessors that are used in the home.

Device 1 ..........................................................................................................

Device 2 ..........................................................................................................[2]


11. A factory discharges its waste materials into a nearby river.

factory

River

BA

research station

factory wasteoutlet pipe

A research station monitors the conditions in the river using sensors (A and B) connected to a computer.

(a) State two suitable sensors that could be used by the research station to monitor the river.

Sensor 1 .........................................................................................................

Sensor 2 .........................................................................................................[2]


(b) Explain why the river conditions are monitored using sensors and a computer rather than manually.

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(c) The scientists at the research station want to analyse the data and display the results in a report.

Describe how they would do this.

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12. A computer system controls the temperature of an indoor swimming pool. Describe how the computer keeps the temperature at a fixed level.

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13. A school has an automatic weather station on the roof. It is connected to a computer in the classroom. An anemometer is used to measure wind speed.

(a) (i) Give one reason why the computer does not use the data directly from the anemometer.

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(ii) What type of device is needed to solve this problem?

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(b) Give two reasons why wind data is collected using an automatic weather station rather than manually.

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(c) Identify two other sensors used to collect weather data.

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2 ......................................................................................................................[2]

14. A computer system controls a robot arm to spray paint a car.

Describe how a sensor could be used in this process.

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15. Explain the difference between analogue and digital data.

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16. Prince’s Theatre uses electronic systems for controlling both sound and light.

(a) Briefly explain the difference between analogue and digital signals, giving an example in each case.

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(b) Explain why both analogue and digital systems can be used in controlling the stage lighting system in a theatre.

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17. Explain ways in which the control of household devices by microprocessors has changed the way people spend time at home.

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18. A market gardener uses a computer-controlled system to keep the humidity in a large greenhouse suitable for growing plants. The system contains these components:

• a computer• analogue to digital converters (ADCs)• humidity sensors• actuators• humidifiers (devices which spray water into the atmosphere to keep the air

humid)• motors for the windows


Describe how these components form a control-feedback loop in this closed system.

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19. Robots are used to explore the surface of distant planets.

Discuss the advantages and disadvantages of using robots instead of sending a manned mission.

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20. Discuss the effects of using computer-controlled robots on factory assembly lines.

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21. A computer system is used to regulate the environment in a large greenhouse where tropical plants are grown. Explain how such a system might work.

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2. tick three data logging. -...

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