1) Why can't we hear radio waves? a) They are too quiet b) Theirfrequency is too high c) Their wavelengths are too wide d) They are transverse waves 2) Which statement about hearing is false? a) Dogs can hear frequencies above our audible range b) Humans have an audible range of 20Hz to 20kHz. c) As you get older your audible range increases d) Whales can hear frequencies below our audible range 3) Why does sound heard round a corner lose some its high frequencies? a) High frequency sound waves are reflected more, as echoes b) High frequency sound waves are absorbed more easily and converted to heat c) Sound waves with a wavelength closer to the size of the door are diffracted more d) Sound waves with a wide wavelength are refracted more 4) One reason why we don't use more renewable energy is... a) Renewable energy sources are often not reliable b) Renewable energy sourcestend to have high start-up times c) Reneable energy sources are expensive d) Renewable energy sources have to be conserved 5) What does a step-up transformer do? a) Decrease the voltage and increase the current of electricity b) Increase the voltage and decrease the current of electricity c) Decrease the voltage and decrease the current of electricity d) Increase the voltage and increase the current of electricity 6) Which of these is a reason why more electricity cables aren't buried underground in the UK? a) They might get hit by lightning b) They need to be well insulated c) It is easy to repair faults above ground d) It costs a lot of money 7) Which of these is NOT a way that hydroelectric dams can harm the environment? a) They release sulphur dioxide, which causes acid rain b) They destroy large areas of land and therefore animals' habitats c) The migration of fish is disrupted d) Flooding land leads to carbon dioxide and methane release as plants die and rot 8) Which of these would you NOT find in a geothermal power plant? a) A turbine b) A generator c) A furnace d) Pipes for water 9) Which of these is NOT true about a solar tower? a) A convection current draws air through the turbines b) Hot air becomes less dense c) The solar tower can only work during hours of daylight d) Less dense air rises 10) Which of these is NOT an examples of a biofuel source? a) Methane, from fermenting animal wastes in sludge digesters b) Nutshells, straw woodchips c) Ethanol from fermented sugar cane d) Carbon dioxide from agriculture
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