Daily Practice · GCSE Science
October 1991 5-a-day
Every sheet in October 1991
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st October 1991Why should you write down the equation even if you cannot finish the calculation?
- 2nd October 1991Two resistors are connected in parallel across a 12 V battery. State the potential difference across each resistor.
- 3rd October 1991What causes the pressure of a gas on the walls of its container?
- 4th October 1991A ball decelerates uniformly from 18 m/s to 0 m/s over a distance of 2.7 m while being caught. Using (final velocity)^2 = (initial velocity)^2 + 2 x acceleration x distance, calculate its deceleration.
- 5th October 1991An X-ray has a wavelength of 1 x 10^-10 m. Calculate its frequency (speed of light = 3 x 10^8 m/s).
- 6th October 1991A satellite in a stable, small-radius, close orbit around the Earth is compared with a satellite in a stable, large-radius, distant orbit. State which of the two satellites has the greater orbital speed.
- 7th October 1991Give one advantage of therapeutic cloning over using unrelated embryonic stem cells.
- 8th October 1991Why are xylem cells strengthened with lignin?
- 9th October 1991Why is glucose converted into starch for storage?
- 10th October 1991Give one piece of evidence that supports Darwin's theory of evolution by natural selection.
- 11th October 1991State one way in which high biodiversity benefits an ecosystem.
- 12th October 1991Explain how painting an iron gate helps prevent it from rusting.
- 13th October 1991Why can an ionic solid not conduct electricity?
- 14th October 1991Name the salt made from zinc oxide and nitric acid.
- 15th October 1991State what is meant by a catalyst.
- 16th October 1991Name the two methods used to produce ethanol industrially.
- 17th October 1991Explain why the natural greenhouse effect is necessary for life on Earth, rather than being a purely harmful process.
- 18th October 1991Define specific heat capacity.
- 19th October 1991State the correct SI unit for density.
- 20th October 1991State the number of protons and the number of neutrons in an alpha particle.
- 21st October 1991State whether sound waves are transverse or longitudinal.
- 22nd October 1991State the name of the component at the centre of a transformer's primary and secondary coils, and state its purpose.
- 23rd October 1991Convert 0.02 mm into micrometres (um).
- 24th October 1991Why does a food test for sugars need a water bath?
- 25th October 1991Explain what is meant by a double blind trial.
- 26th October 1991State why a reflex action is described as involuntary.
- 27th October 1991A student counts 3, 5, 4 and 8 dandelion plants in four separate 1 m^2 quadrats. Calculate the mean number of dandelions per quadrat.
- 28th October 1991State one benefit of recycling metal rather than extracting new metal from its ore.
- 29th October 1991Name the three types of strong chemical bonding.
- 30th October 1991Give the formula for atom economy.
- 31st October 1991Explain, 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.