Daily Practice · GCSE Science
March 1991 5-a-day
Every sheet in March 1991
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st March 1991A sample produces only one spot when run in three different solvents. What does this suggest about the sample?
- 2nd March 1991Why should a line of best fit be drawn rather than joining the plotted points?
- 3rd March 1991In a parallel circuit, how do the branch currents relate to the total current?
- 4th March 1991State the approximate radius of an atom.
- 5th March 1991Explain, using Newton's Third Law, why a swimmer is able to push themselves forward by pushing backward against the water.
- 6th March 1991State what happens to the magnetic field around a straight current-carrying wire if the direction of the current is reversed.
- 7th March 1991State what red-shift shows about the motion of most distant galaxies.
- 8th March 1991Give one adaptation of a root hair cell for absorbing mineral ions.
- 9th March 1991Explain 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.
- 10th March 1991State the word equation for aerobic respiration.
- 11th March 1991State one ethical concern raised by embryo screening.
- 12th March 1991Why is a polystyrene cup with a lid used in energy-change experiments?
- 13th March 1991Write the electronic structure of a magnesium atom (12 electrons).
- 14th March 1991A student measures the mass of a beaker of hydrochloric acid and marble chips as they react and finds it falls. Explain why.
- 15th March 1991State the name given to the negative electrode in electrolysis.
- 16th March 1991Explain why using a light sensor and data logger is more reliable than timing by eye in the disappearing cross practical.
- 17th March 1991Name the gas that relights a glowing splint.
- 18th March 1991Name two gases that dissolve in atmospheric water droplets to cause acid rain.
- 19th March 1991Define power and give its unit.
- 20th March 1991Convert a density of 2.7 grams per cubic centimetre into kilograms per cubic metre.
- 21st March 1991A cyclist rides 300 m north then 300 m back south to the start. State the total distance travelled and total displacement.
- 22nd March 1991Explain, in terms of particle motion, why a wave can transfer energy without transferring matter.
- 23rd March 1991Name the region of the Solar System where most asteroids are found.
- 24th March 1991Give one advantage of a light microscope over an electron microscope.
- 25th March 1991Name the blood vessel that carries deoxygenated blood from the heart to the lungs.
- 26th March 1991A lamp is placed 10 cm from pondweed. Calculate the relative light intensity using relative light intensity = 1 / distance^2.
- 27th March 1991A person's blood glucose concentration is 4.8 mmol/dm^3 before breakfast and 7.2 mmol/dm^3 after breakfast. Calculate the increase in blood glucose concentration.
- 28th March 1991Thermus aquaticus is a species of bacterium that lives in hot springs at temperatures that would kill most other organisms. State the name given to an organism that is adapted to survive in such extreme conditions.
- 29th March 1991Classify crude oil as finite or renewable, and justify your answer.
- 30th March 1991Why can an ionic compound conduct electricity when molten or dissolved but not when solid?
- 31st March 1991Calculate the number of moles of sodium hydroxide in 200 cm3 of a 0.500 mol/dm3 solution.