 This Homework requires GRAPH PAPER!
In your jotter write the DATE in the margin. |
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| Question 1. | |
| Janet investigated the strength of model bridges. She added weights to each bridge until the bridge collapsed. The experiments she carried out are shown below. | |
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| a) | Janet wanted to find out how the length of a bridge affects its strength.
Which two boxes show the experiments she should compare for a fair test? |
| b) | Janet compared the experiments in boxes 1 and 4. What was she trying to find out? |
| c) | Janet needed to make her experiment a fair test, name one other variable she should she keep constant if comparing boxes 1 and 4? |
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Question 2. |
 A road tanker delivers unleaded petrol and diesel to a filling station. The volume of unleaded petrol in the tanker is 6 600 litres.
The total volume of fuel in the tanker is 11000 litres. |
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| a) | Calculate the volume of diesel delivered. Remember to show your working. |
| b) | |
| Petrol is sold at £1.20 per litre and diesel at £1.25 per litre.
How much money will the garage owner collect when he has sold all the fuel delivered? |
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| c) | The garage makes 5% profit per litre of petrol. What is the garage’s profit? |
| Question 3. |
A plumber fitted a 12 kg water tank in a house.  He connected 4 copper pipes to the tank. Each pipe had a mass of 2 kg.
What is the total mass of the water tank and the four pipes? |
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| Question 4. |
 The wreck of a Spanish galleon was found by divers. The divers found five gold coins.
The total mass of the five coins was 125 g. Calculate the mass of one coin. |
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| Question 5. | |
| Mira decided to find out if it was true that adding salt to water makes it boil at a higher temperature. She conducted an experiment at home using salt water.
Mira heated salt water and measured the temperature every minute. |
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| a) | Plot a line graph to show Mira’s results. |
| b) | What term would describe the salt water between 7 and 10 minutes? |
| c) | What conclusion can Mira draw on the effect of adding salt to water? |
| Question 6. |
| Air is a mixture of different gases.
Air is made up of oxygen (21%), Nitrogen (78%) and other gases (1%). |
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| In your jotter construct a pie chart to show the composition of the air. |
