Daily Practice · GCSE Science
October 1989 5-a-day
Every sheet in October 1989
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st October 1989Why does the rate of photosynthesis fall at very high temperatures?
- 2nd October 1989Explain, using the idea of natural selection, why a population of insects can become resistant to a pesticide over time.
- 3rd October 1989Explain why large-scale deforestation increases the concentration of carbon dioxide in the atmosphere.
- 4th October 1989State the four stages considered in a life cycle assessment.
- 5th October 1989Why does simple molecular carbon dioxide have a much lower melting point than giant covalent silicon dioxide?
- 6th October 1989Define oxidation in terms of electrons.
- 7th October 1989State two units that the rate of a reaction can be measured in.
- 8th October 1989Name the carboxylic acid produced when ethanol is oxidised.
- 9th October 1989Describe, in terms of wavelength, the difference between the radiation the Earth receives from the Sun and the radiation it re-emits from its surface.
- 10th October 1989A 3 kg object is raised 2 m. Calculate the gravitational potential energy gained. (g = 9.8 N/kg)
- 11th October 1989State what happens to the internal energy of a substance as it is heated, in terms of the kinetic and potential energy of its particles.
- 12th October 1989A GM tube detects a count rate of 240 counts per minute from a source. After 15 days the count rate has fallen to 30 counts per minute. Show that this data is consistent with a half-life of 5 days.
- 13th October 1989Define the term 'wavelength' of a wave.
- 14th October 1989State the difference between an alternator and a dynamo.
- 15th October 1989A microscope has a x10 eyepiece lens and a x20 objective lens. Calculate the total magnification.
- 16th October 1989State two functions of bile.
- 17th October 1989What is an antigen?
- 18th October 1989State the type of effector that produces a physical response by contracting.
- 19th October 1989Give one example of a biotic factor that could affect a population of rabbits.
- 20th October 1989Explain why potable water is not the same as pure water.
- 21st October 1989Explain why sodium chloride conducts electricity when molten but not when solid.
- 22nd October 1989State two reasons why a percentage yield is less than 100 percent.
- 23rd October 1989State what is meant by the activation energy of a reaction.
- 24th October 1989Balance the equation for the complete combustion of methane: CH4 + O2 -> CO2 + H2O
- 25th October 1989Explain why the baseline is drawn in pencil rather than ink.
- 26th October 1989Give one reason for taking the gradient from the line of best fit rather than from two data points.
- 27th October 1989State the equation linking potential difference, current and resistance.
- 28th October 1989Define half-life.
- 29th October 1989State two factors that increase a driver's thinking distance.
- 30th October 1989Name a typical material used to make a permanent magnet, and a typical material used to make an induced (temporary) magnet.
- 31st October 1989State, in one sentence, what the Big Bang model proposes about the early universe.