CIE iGCSE Co-Ordinated Science P1.6.3 Energy resources Exam Style Questions Paper 2
▶️ Answer/Explanation
Efficiency = (useful output energy / total input energy) × 100% = (12 / 20) × 100% = 60%. The lamp converts 60% of input energy into useful light, the rest is wasted as heat.
✅ Answer: (C)
✅ Answer: (C)
▶️ Answer/Explanation
Wind is generated by the uneven heating of the Earth’s atmosphere by the Sun, so all wind energy ultimately originates from solar energy.
Geothermal energy comes from radioactive decay in the Earth’s core, tidal energy comes mainly from the Moon’s gravity, and nuclear fission uses stored nuclear energy in atoms — none of these originate solely from the Sun.
✅ Answer: (D)
Geothermal energy comes from radioactive decay in the Earth’s core, tidal energy comes mainly from the Moon’s gravity, and nuclear fission uses stored nuclear energy in atoms — none of these originate solely from the Sun.
✅ Answer: (D)
▶️ Answer/Explanation
Geothermal energy comes from heat continually generated within the Earth, so it is classed as a renewable energy resource that will not run out on a human timescale.
Nuclear power, in contrast, relies on a finite supply of uranium fuel that is mined and used up, making it a non-renewable resource.
So geothermal power is renewable while nuclear power is not.
✅ Answer: (C)
Nuclear power, in contrast, relies on a finite supply of uranium fuel that is mined and used up, making it a non-renewable resource.
So geothermal power is renewable while nuclear power is not.
✅ Answer: (C)
▶️ Answer/Explanation
Efficiency measures how much of the energy supplied to a device is converted into a useful form, rather than wasted as heat or sound.
It is defined as \( \text{efficiency} = \dfrac{\text{useful energy output}}{\text{total energy input}} \times 100\% \).
The other options either invert the fraction or use “wasted energy” in place of “useful energy output”, which does not match the correct definition.
✅ Answer: (A)
It is defined as \( \text{efficiency} = \dfrac{\text{useful energy output}}{\text{total energy input}} \times 100\% \).
The other options either invert the fraction or use “wasted energy” in place of “useful energy output”, which does not match the correct definition.
✅ Answer: (A)
▶️ Answer/Explanation
Fossil fuels such as coal, oil and natural gas formed over millions of years and are being used up far faster than they can form.
Because they cannot be replenished within a human timescale, they are classed as non-renewable.
Tides, geothermal heat and wind are naturally replenished and are therefore renewable energy resources.
✅ Answer: (A)
Because they cannot be replenished within a human timescale, they are classed as non-renewable.
Tides, geothermal heat and wind are naturally replenished and are therefore renewable energy resources.
✅ Answer: (A)