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Daily Practice · GCSE Science

August 1991 5-a-day

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August 1991

31 sheets · 155 questions · GCSE

August 1991 compilationAll answers

Every sheet in August 1991

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 1991State the difference between an alternator and a dynamo.
  2. 2nd August 1991A cube-shaped model cell has sides of length 3 cm. Calculate the surface area to volume ratio of the cube. Give your answer in the form n : 1.
  3. 3rd August 1991What is an enzyme?
  4. 4th August 1991Describe phagocytosis.
  5. 5th August 1991State the type of effector that produces a physical response by contracting.
  6. 6th August 1991Give one example of a biotic factor that could affect a population of rabbits.
  7. 7th August 1991Name the four stages usually considered in a life cycle assessment of a product.
  8. 8th August 1991A student says that metals conduct electricity because they contain free-moving ions. Explain why this statement is incorrect, and give the correct explanation.
  9. 9th August 1991Give the formula for percentage yield.
  10. 10th August 1991A student reacts excess zinc powder with 25 cm3 of copper sulfate solution in a polystyrene cup. The starting temperature is 21.0 degrees C and the maximum temperature reached is 58.5 degrees C. Calculate the temperature change.
  11. 11th August 1991Balance the equation for the complete combustion of methane: CH4 + O2 -> CO2 + H2O
  12. 12th August 1991State two advantages of instrumental methods of analysis, such as GC-MS, compared with manual chemical tests.
  13. 13th August 1991Distinguish repeatability from reproducibility.
  14. 14th August 1991How does the resistance of a thermistor change as it gets hotter?
  15. 15th August 1991What is an alpha particle made of?
  16. 16th August 1991State two factors that increase a driver's thinking distance.
  17. 17th August 1991Name a typical material used to make a permanent magnet, and a typical material used to make an induced (temporary) magnet.
  18. 18th August 1991State, in one sentence, what the Big Bang model proposes about the early universe.
  19. 19th August 1991Explain why a plant cell placed in pure water does not burst.
  20. 20th August 1991Which type of pathogen causes athlete's foot, a fungal skin infection?
  21. 21st August 1991A yeast culture respires without oxygen. Name the two products of this reaction, and name one industrial process that relies on it.
  22. 22nd August 1991A man who is a known carrier of cystic fibrosis (Ff) has children with a woman who has been confirmed to carry no cystic fibrosis allele at all (FF). Explain why none of their children can have cystic fibrosis.
  23. 23rd August 1991In the rate experiment where a cross disappears, why is the result subjective?
  24. 24th August 1991An atom has an atomic number of 17 and a mass number of 37. How many neutrons does it have?
  25. 25th August 1991Calculate the number of moles in 20 g of calcium carbonate. (Mr = 100)
  26. 26th August 1991Concentrated sodium chloride solution (brine) is electrolysed using inert electrodes. State the products formed at the cathode and at the anode.
  27. 27th August 1991Explain why increasing temperature increases the rate of a reaction, referring to both the frequency and the energy of collisions.
  28. 28th August 1991A solid gives a lilac flame test. Name the metal ion present.
  29. 29th August 1991Name the two additional products that can form during the incomplete combustion of a hydrocarbon fuel.
  30. 30th August 1991Give the equation for efficiency in terms of energy.
  31. 31st August 1991Calculate the mass of 0.5 cubic metres of a material of density 2400 kilograms per cubic metre.