Daily Practice · GCSE Science
February 1991 5-a-day
Every sheet in February 1991
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st February 1991Explain why ultraviolet, X-rays and gamma rays can be hazardous to human health, but radio waves are not.
- 2nd February 1991Explain, in terms of forces, why a satellite in a stable orbit does not fall towards the Earth or fly off into space.
- 3rd February 1991What happens to the DNA before mitosis begins?
- 4th February 1991State two conditions that increase the rate of transpiration.
- 5th February 1991A lamp is moved from 15 cm to 30 cm away. What happens to the light intensity?
- 6th February 1991In pea plants, the allele for tall stems (T) is dominant over the allele for short stems (t). A homozygous tall plant (TT) is crossed with a homozygous short plant (tt). State the genotype and phenotype of all the offspring.
- 7th February 1991Name the biological process that removes carbon dioxide from the atmosphere and converts it into carbon compounds in a plant.
- 8th February 1991State one environmental benefit of recycling aluminium cans rather than making new aluminium from ore.
- 9th February 1991Explain why graphite conducts electricity but diamond does not.
- 10th February 1991State what is observed when magnesium ribbon is added to copper sulfate solution.
- 11th February 1991State the equation for the mean rate of a reaction in terms of the quantity of reactant used.
- 12th February 1991State what happens to the carbon-to-carbon double bond of an alkene monomer during addition polymerisation.
- 13th February 1991Describe, in terms of wavelength, the difference between the radiation the Earth receives from the Sun and the radiation it re-emits from its surface.
- 14th February 1991Calculate the kinetic energy of a 0.5 kg ball moving at 6 m/s.
- 15th February 1991State what happens to the internal energy of a substance as it is heated, in terms of the kinetic and potential energy of its particles.
- 16th February 1991Explain why americium-241, an alpha emitter, is suitable for use in a smoke detector.
- 17th February 1991Name the type of electromagnetic wave used to sterilise medical equipment.
- 18th February 1991A transformer has a primary current of 2.0 A and a primary voltage of 230 V. The secondary voltage is 460 V. Assuming the transformer is 100 percent efficient, calculate the secondary current.
- 19th February 1991A microscope has a x10 eyepiece lens and a x20 objective lens. Calculate the total magnification.
- 20th February 1991Where is bile made and where is it stored?
- 21st February 1991Why does a vaccinated person not usually become ill when they meet the pathogen?
- 22nd February 1991Explain why reflex responses are faster than voluntary responses.
- 23rd February 1991Define community, in ecological terms.
- 24th February 1991Explain why potable water is not the same as pure water.
- 25th February 1991Explain why sodium chloride conducts electricity when molten but not when solid.
- 26th February 1991Calculate the concentration in moles per cubic decimetre of a solution containing 0.5 mol in 250 cubic centimetres.
- 27th February 1991State the energy transfer that occurs during an endothermic reaction.
- 28th February 1991Name the two industrial methods of cracking.