Revision Library
/Subjects/Science/Daily Practice
Daily Practice · GCSE Science

July 1981 5-a-day

← Today's GCSE Science sheet

July 1981

31 sheets · 155 questions · GCSE

July 1981 compilationAll answers

Every sheet in July 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 July 1981State one reason why simple covalent substances such as chlorine have low melting points.
  2. 2nd July 1981Convert 250 cubic centimetres into cubic decimetres.
  3. 3rd July 1981A student heats solid copper carbonate strongly in a test tube, and it breaks down into copper oxide and carbon dioxide. Heating must be continued throughout the reaction for it to keep going. State whether this thermal decomposition reaction is exothermic or endothermic, and explain your reasoning.
  4. 4th July 1981Define the term 'hydrocarbon'.
  5. 5th July 1981Write the formula for calculating an Rf value.
  6. 6th July 1981Readings have a mean of 20.0 cm and a range of 1.0 cm. Calculate the percentage uncertainty.
  7. 7th July 1981What happens to the total resistance when a second resistor is added in parallel, and why?
  8. 8th July 1981What happens inside the nucleus when a beta particle is emitted?
  9. 9th July 1981A shopping trolley has a mass of 25 kg. Calculate its weight, taking g = 9.8 N/kg.
  10. 10th July 1981A student wraps a coil of insulated wire around an iron nail and connects it to a battery. Name the device this creates, and state one way to increase its magnetic field strength.
  11. 11th July 1981Explain why red-shift observations support the idea that the universe is expanding, rather than Earth simply being at the centre of the universe with everything moving away from it.
  12. 12th July 1981State three factors that increase the rate of diffusion.
  13. 13th July 1981A student measures the mean diameter of a zone of inhibition as 12 mm. Calculate its radius.
  14. 14th July 1981Explain, in terms of respiration, why a build-up of lactic acid causes muscle fatigue during vigorous exercise.
  15. 15th July 1981A man has genotype XY. State his sex, and state which sex chromosomes are found in the sperm cells he produces.
  16. 16th July 1981What does 'concordant' mean when applied to titres?
  17. 17th July 1981What did the alpha scattering experiment show that the plum pudding model could not explain?
  18. 18th July 1981Magnesium is burned in an open crucible and the mass increases. Explain why.
  19. 19th July 1981In the industrial extraction of aluminium, explain why the aluminium oxide is dissolved in molten cryolite rather than melted on its own.
  20. 20th July 1981Explain why increasing the surface area of a solid reactant increases the rate of a reaction.
  21. 21st July 1981Describe the result of the test for carbon dioxide.
  22. 22nd July 1981Give one piece of evidence used to link human activity to recent climate change.
  23. 23rd July 1981Give one advantage and one disadvantage of wind power.
  24. 24th July 1981Why does the temperature stay constant while a substance boils?
  25. 25th July 1981A resultant force of 45 N acts on an object of mass 9.0 kg. Calculate its acceleration. Use F = m x a.
  26. 26th July 1981A wave has a frequency of 50 Hz. Calculate its period.
  27. 27th July 1981Explain, in terms of forces, why an orbiting satellite does not travel off in a straight line.
  28. 28th July 1981Where is the DNA found in a bacterial cell?
  29. 29th July 1981Name the substance in red blood cells that binds oxygen.
  30. 30th July 1981State three factors that can limit the rate of photosynthesis.
  31. 31st July 1981State one risk factor linked to type 2 diabetes.