4. Figure 6 shows how much electricity was generated using coal-fired and gas-fired power stations in January for 5 years in the UK.
Figure 6
i- Determine the percentage increase in electricity generated using gas-fired power stations from 2014 to 2018.
[2 marks]
ANSWER
ii- Give two environmental advantages of using a gas-fired power station to generate electricity compared with using a coal-fired power station.
[2 marks]
ANSWER
Sulfur dioxide isn’t emitted, so there is no chance of acid rain.
No solid waste
Contributes to glomal warming lesser than the coal-fired power station.
Coal mining is less hazardous than coal mining.
(You may choose any two points from above.)
The mean surface temperature of the sea changes throughout the year.
A change in the mean surface temperature from year to year indicates climate change.
Figure 7 shows how the mean surface temperature changed between 1988 and 2016.
iii- A student does not believe that climate change is occurring.
Explain how the data in Figure 7 suggests the student is wrong.
[2 marks]
ANSWER
The mean surface temperature is increasing. In fact, over the a long period of time, the mean surface temperature has increased from 16.45 - 16.96℃.
iv- A thermistor can be used to measure temperature.
Figure 8 shows how the resistance of four different thermistors A, B, C and D, varies with temperature.
Which of the four thermistors would be the most suitable to measure the surface temperature of the sea?
Tick () one box.
Explain your answer.
[3 marks]
ANSWER
Option C is correct as the chjange in resistance of this thermistor is greatest amongst all the thermistors.
Option A & B thermistors’ graph show that they have shown less or small change in their resistance. Whereas, the option D thermistor’s graph is has no data available between 0 to 40℃ whereas mean surface temperature lies in the range of 16.45 - 16.96℃.
