Daily Practice · GCSE Science
November 1991 5-a-day
Every sheet in November 1991
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st November 1991State what happens to the boiling point of hydrocarbons as their chain length increases.
- 2nd November 1991State one advantage of running known reference substances alongside an unknown sample on the same chromatogram, rather than only comparing to published Rf values.
- 3rd November 1991How is the uncertainty in a set of repeated readings usually estimated?
- 4th November 1991Define electric current.
- 5th November 1991A source has a half-life of 5 days and an initial activity of 1600 Bq. What is its activity after 15 days?
- 6th November 1991A skateboarder of mass 55 kg moving at 4 m/s collides with and grabs onto a stationary shopping trolley of mass 20 kg, and they move off together. Calculate their combined velocity immediately after the collision.
- 7th November 1991Describe the shape of the magnetic field produced around a long straight wire carrying a current.
- 8th November 1991State how the amount of red-shift is related to a galaxy's distance from Earth.
- 9th November 1991Calculate the surface area to volume ratio of a cube of side 2 cm.
- 10th November 1991State one way that pathogens can be spread from person to person.
- 11th November 1991State the word equation for anaerobic respiration in human muscle cells.
- 12th November 1991State whether cystic fibrosis is caused by a dominant or a recessive allele.
- 13th November 1991Give the resolution of a burette that can be read to the nearest half of a small division.
- 14th November 1991Why is an atom electrically neutral?
- 15th November 1991State the law of conservation of mass.
- 16th November 1991Aqueous copper sulfate solution is electrolysed using inert graphite electrodes. State the products formed at (a) the cathode and (b) the anode, giving a reason for each.
- 17th November 1991In the disappearing cross required practical, state the dependent variable that is measured.
- 18th November 1991Give one piece of evidence that a solid sample is impure, based on its melting behaviour.
- 19th November 1991Explain why carbon monoxide is dangerous even though it has no smell.
- 20th November 1991Why can no device be 100 percent efficient?
- 21st November 1991Why is melting described as a physical change?
- 22nd November 1991State whether friction is a contact force or a non-contact force.
- 23rd November 1991A water wave has a wavelength of 0.4 m and a frequency of 2.5 Hz. Calculate its speed.
- 24th November 1991Explain how elements heavier than iron, such as gold, are created and distributed through the universe.
- 25th November 1991Convert 0.05 mm into micrometres.
- 26th November 1991State the function of the valves in the heart and in veins.
- 27th November 1991Complete the word equation for anaerobic respiration in yeast: glucose -> ___ + ___
- 28th November 1991State the type of diabetes in which the pancreas produces little or no insulin.
- 29th November 1991The Arctic fox has small, rounded ears compared with the desert fennec fox, which has very large ears. State whether this is a structural, behavioural or functional adaptation, and explain how it helps the Arctic fox survive.
- 30th November 1991Give one reason distillation of seawater requires a large energy input.