Daily Practice · GCSE Science
September 1977 5-a-day
Every sheet in September 1977
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st September 1977Why does a food test for sugars need a water bath?
- 2nd September 1977Explain what is meant by a double blind trial.
- 3rd September 1977Define a synapse.
- 4th September 1977Give one example of an abiotic factor that could affect where a plant species grows.
- 5th September 1977Explain why potable water is not the same as pure water.
- 6th September 1977Explain why sodium chloride conducts electricity when molten but not when solid.
- 7th September 1977Give the formula for atom economy.
- 8th September 1977Explain, 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 1977State the general formula of the alkanes.
- 10th September 1977State 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 1977How is the uncertainty in a set of repeated readings usually estimated?
- 12th September 1977Define electric current.
- 13th September 1977A source has a half-life of 5 days and an initial activity of 1600 Bq. What is its activity after 15 days?
- 14th September 1977Calculate the momentum of a 1200 kg car travelling at 18 m/s.
- 15th September 1977Explain why a compass needle placed just outside one end of a current-carrying solenoid lines up parallel to the solenoid's axis.
- 16th September 1977Name the second major piece of observational evidence, besides red-shift, that supports the Big Bang model.
- 17th September 1977Calculate the surface area to volume ratio of a cube of side 2 cm.
- 18th September 1977Explain why a small number of healthy volunteers are given a very low dose of a new drug in the first stage of a clinical trial.
- 19th September 1977A student counts 19 pulse beats in 10 seconds immediately after running. Calculate her heart rate in beats per minute.
- 20th September 1977State how many chromosomes are found in a normal human body cell, and how they are arranged.
- 21st September 1977Give the resolution of a burette that can be read to the nearest half of a small division.
- 22nd September 1977Why is an atom electrically neutral?
- 23rd September 1977State the law of conservation of mass.
- 24th September 1977In the industrial extraction of aluminium, explain why the carbon anodes need to be replaced regularly.
- 25th September 1977State the condition, in terms of energy, that colliding particles must meet for a reaction to occur.
- 26th September 1977Give one piece of evidence that a solid sample is impure, based on its melting behaviour.
- 27th September 1977Explain why carbon monoxide is dangerous even though it has no smell.
- 28th September 1977Why can no device be 100 percent efficient?
- 29th September 1977Why is melting described as a physical change?
- 30th September 1977A cyclist rides 300 m north then 300 m back south to the start. State the total distance travelled and total displacement.