Daily Practice · GCSE Science
February 1987 5-a-day
Every sheet in February 1987
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st February 1987State the number of protons and the number of neutrons in an alpha particle.
- 2nd February 1987A radio wave has a wavelength of 3 m. Calculate its frequency, given that all electromagnetic waves travel at 3 x 10^8 m/s in a vacuum.
- 3rd February 1987Explain why electricity is transmitted through the National Grid at a very high voltage rather than at the voltage used in homes.
- 4th February 1987A microscope has a x10 eyepiece lens and a x20 objective lens. Calculate the total magnification.
- 5th February 1987Why does a food test for sugars need a water bath?
- 6th February 1987Explain what is meant by a double blind trial.
- 7th February 1987Name the chemical released at a synapse that carries the signal across the gap.
- 8th February 1987Explain why deforestation to create land for cattle grazing can reduce biodiversity.
- 9th February 1987Explain why potable water is not the same as pure water.
- 10th February 1987Explain why sodium chloride conducts electricity when molten but not when solid.
- 11th February 1987Give the formula for atom economy.
- 12th February 1987Explain, 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.
- 13th February 1987State two products, other than water, that can be formed during the incomplete combustion of a hydrocarbon.
- 14th February 1987State one advantage of running known reference substances alongside an unknown sample on the same chromatogram, rather than only comparing to published Rf values.
- 15th February 1987How is the uncertainty in a set of repeated readings usually estimated?
- 16th February 1987Define electric current.
- 17th February 1987A source has a half-life of 5 days and an initial activity of 1600 Bq. What is its activity after 15 days?
- 18th February 1987Explain why a larger vehicle mass increases braking distance.
- 19th February 1987State the type of force that always acts between an induced magnet and the magnet that induced it.
- 20th February 1987Name the model of the origin of the universe that is supported by red-shift observations.
- 21st February 1987Calculate the surface area to volume ratio of a cube of side 2 cm.
- 22nd February 1987Explain 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.
- 23rd February 1987Define oxygen debt.
- 24th February 1987Explain one benefit of the Human Genome Project.
- 25th February 1987Give the resolution of a burette that can be read to the nearest half of a small division.
- 26th February 1987Why is an atom electrically neutral?
- 27th February 1987State the law of conservation of mass.
- 28th February 1987Explain why solid sodium chloride does not conduct electricity, but molten sodium chloride does.