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Daily Practice · GCSE Science

August 1981 5-a-day

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August 1981

31 sheets · 155 questions · GCSE

August 1981 compilationAll answers

Every sheet in August 1981

The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.

  1. 1st August 1981In a grassland food chain, the biomass of grass available is 8400 kg and the biomass transferred to the rabbits that eat it is 940 kg. Calculate the percentage efficiency of biomass transfer from grass to rabbits, to 3 significant figures.
  2. 2nd August 1981Explain, in terms of particle size, how reverse osmosis separates water from dissolved salt.
  3. 3rd August 1981Give the charge on an ion formed by a group 2 element.
  4. 4th August 1981Explain why aluminium cannot be extracted from aluminium oxide by heating with carbon.
  5. 5th August 1981State one factor that affects the size of the voltage produced by a chemical cell.
  6. 6th August 1981Define the term 'homologous series'.
  7. 7th August 1981Name three greenhouse gases.
  8. 8th August 1981A kettle transfers 360000 J of energy in 150 s. Calculate its power in watts.
  9. 9th August 1981Why is the live wire dangerous even when a device is switched off?
  10. 10th August 1981Describe the plum pudding model.
  11. 11th August 1981Write down the equation that links moment, force and distance.
  12. 12th August 1981A wire of length 0.20 m carries a current of 5.0 A at right angles to a magnetic field of flux density 0.60 T. Calculate the force on the wire.
  13. 13th August 1981Name the apparatus used to estimate the population of a slow-moving or non-moving species in a field.
  14. 14th August 1981Name the plant tissue that transports water and dissolved minerals from the roots to the leaves.
  15. 15th August 1981Define a communicable disease.
  16. 16th August 1981Explain, in terms of blood vessels, how the skin helps to cool the body when it is too hot.
  17. 17th August 1981Define speciation.
  18. 18th August 1981Explain, in terms of electrons, why reactivity decreases going down Group 7.
  19. 19th August 1981Explain why potassium is more reactive than sodium.
  20. 20th August 1981Calculate the number of moles in 88 g of carbon dioxide. (Mr = 44)
  21. 21st August 1981Explain, in terms of bonds, why breaking bonds is an endothermic process.
  22. 22nd August 1981State the catalyst commonly used in the Haber process.
  23. 23rd August 1981A solution gives a cream precipitate when acidified with dilute nitric acid and then treated with silver nitrate solution. Name the halide ion present.
  24. 24th August 1981A device transfers 4500 J in 90 s. Calculate its power.
  25. 25th August 1981In a series circuit, the current through one lamp is 0.30 A. State the current through a second lamp in the same circuit.
  26. 26th August 1981Why does a bicycle pump get warm when used?
  27. 27th August 1981Define the term 'vector quantity' and give one example.
  28. 28th August 1981Name the type of electromagnetic wave used to treat cancer by killing cells in a tumour, and state which part of the atom emits it.
  29. 29th August 1981State one difference between a moon and an artificial satellite.
  30. 30th August 1981What happens to the DNA before mitosis begins?
  31. 31st August 1981State two conditions that increase the rate of transpiration.