Daily Practice · GCSE Science
September 1988 5-a-day
Every sheet in September 1988
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st September 1988Why does a food test for sugars need a water bath?
- 2nd September 1988Explain what is meant by a double blind trial.
- 3rd September 1988A ruler is released and falls 20 cm before being caught. Using distance = 0.5 x g x time^2 with g = 9.8 m/s^2, calculate the reaction time, to 3 significant figures.
- 4th September 1988Name the equipment used to measure the abundance of a small plant species within a sample area.
- 5th September 1988State the two main steps used to produce potable water from a fresh water source.
- 6th September 1988State the charge on a calcium ion (Group 2).
- 7th September 1988Give the formula for atom economy.
- 8th September 1988Explain, in terms of the reaction pathway, why adding a catalyst increases the rate of a reaction without changing the overall energy change of the reaction.
- 9th September 1988Define the term 'hydrocarbon'.
- 10th September 1988State one advantage of running known reference substances alongside an unknown sample on the same chromatogram, rather than only comparing to published Rf values.
- 11th September 1988How is the uncertainty in a set of repeated readings usually estimated?
- 12th September 1988Define electric current.
- 13th September 1988A source has a half-life of 5 days and an initial activity of 1600 Bq. What is its activity after 15 days?
- 14th September 1988A shopping trolley has a mass of 25 kg. Calculate its weight, taking g = 9.8 N/kg.
- 15th September 1988A 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.
- 16th September 1988Explain 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.
- 17th September 1988Calculate the surface area to volume ratio of a cube of side 2 cm.
- 18th September 1988Name the vector that spreads the protist pathogen that causes malaria.
- 19th September 1988Explain, in terms of respiration, why a build-up of lactic acid causes muscle fatigue during vigorous exercise.
- 20th September 1988A man has genotype XY. State his sex, and state which sex chromosomes are found in the sperm cells he produces.
- 21st September 1988Give the resolution of a burette that can be read to the nearest half of a small division.
- 22nd September 1988Why is an atom electrically neutral?
- 23rd September 1988State the law of conservation of mass.
- 24th September 1988In the industrial extraction of aluminium, explain why the aluminium oxide is dissolved in molten cryolite rather than melted on its own.
- 25th September 1988Explain why increasing the surface area of a solid reactant increases the rate of a reaction.
- 26th September 1988Give one piece of evidence that a solid sample is impure, based on its melting behaviour.
- 27th September 1988Explain why carbon monoxide is dangerous even though it has no smell.
- 28th September 1988Why can no device be 100 percent efficient?
- 29th September 1988Why is melting described as a physical change?
- 30th September 1988A gardener pushes a mower with a force of 60 N through a distance of 8.0 m. Calculate the work done. Use W = F x s.