GCSE AQA June 2024 Higher Triple Science Physics Paper 2 Mark Scheme

GCSE AQA June 2024 Higher Triple Science Physics Paper 2 Mark Scheme .Describe the transfer of energy in a closed system for a cold spoon and hot soup. Assume the flask is a perfect thermal insulator. - ANSWER-Energy is transferred from the thermal energy store of the soup to the useless thermal energy store of the spoon (causing the soup to cool down slightly). Energy transfers have occurred within the system, but no energy has left the system - so the net change in energy is zero. .For a given power, what does increasing the pd do? - ANSWER-Decreases the current, which decreases the energy lost by heating the wires and the surroundings .Give 1 disadvantage of solar cells - ANSWER-Initial costs are high .Give 2 advantages of bio-fuels - ANSWER-Carbon neutral Reliable .Give 2 disadvantages of geothermal power - ANSWER-There aren't very many suitable places The cost of building a plant is high .Give 2 disadvantages of tidal barrages - ANSWER-Spoils the view Alters the habitat of the wildlife .Give 3 disadvantages of bio-fuels - ANSWER-Cost to refine bio-fuels so they can be used is high In some areas, large areas of forest have been cleared to make room for bio-fuel crops Some animals have lost their habitats due to planting these crops .Give 3 disadvantages of hydro-electric power - ANSWER-Possible loss of habitat Reservoirs look unsightly The flooding of the valley has an impact on the environment as rotting vegetation releases methane and carbon dioxide .Give 4 advantages of hydro-electric power - ANSWER-Provides an immediate response to an increased demand for electricity Reliable No fuel costs Minimal running costs .Give 4 advantages of solar cells - ANSWER-No pollution Very reliable in sunny countries Energy is free Running costs are almost nil .Give 4 advantages of wind turbines - ANSWER-No pollution No fuel costs Minimal running costs No permanent damage to the landscape .Give 5 advantages of tidal barrages - ANSWER-No pollution Reliable No fuel costs Minimal running costs Has the potential for generating lots of energy .Give 5 disadvantages of wave power - ANSWER-Disturbs the sea bed Spoils the view Hazard to boats Initial costs are high Fairly unreliable as they stop working when the wind drops .Give 5 disadvantages of wind turbines - ANSWER-Spoil the view Can be very noisy Cannot increase supply when there's extra demand Turbines stop when there is no wind or it is too strong Initial costs are quite high