Daily Practice · GCSE Science
April 1990 5-a-day
Every sheet in April 1990
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st April 1990Give one example of an abiotic factor that could affect where a plant species grows.
- 2nd April 1990Name the four stages usually considered in a life cycle assessment of a product.
- 3rd April 1990A student says that metals conduct electricity because they contain free-moving ions. Explain why this statement is incorrect, and give the correct explanation.
- 4th April 1990Give the formula for atom economy.
- 5th April 1990Explain, 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.
- 6th April 1990State the general formula of the alkanes.
- 7th April 1990State one advantage of running known reference substances alongside an unknown sample on the same chromatogram, rather than only comparing to published Rf values.
- 8th April 1990How is the uncertainty in a set of repeated readings usually estimated?
- 9th April 1990Define electric current.
- 10th April 1990A source has a half-life of 5 days and an initial activity of 1600 Bq. What is its activity after 15 days?
- 11th April 1990Calculate the momentum of a 1200 kg car travelling at 18 m/s.
- 12th April 1990Explain why a compass needle placed just outside one end of a current-carrying solenoid lines up parallel to the solenoid's axis.
- 13th April 1990Name the second major piece of observational evidence, besides red-shift, that supports the Big Bang model.
- 14th April 1990Calculate the surface area to volume ratio of a cube of side 2 cm.
- 15th April 1990Which type of pathogen causes athlete's foot, a fungal skin infection?
- 16th April 1990A student counts 19 pulse beats in 10 seconds immediately after running. Calculate her heart rate in beats per minute.
- 17th April 1990State how many chromosomes are found in a normal human body cell, and how they are arranged.
- 18th April 1990Give the resolution of a burette that can be read to the nearest half of a small division.
- 19th April 1990Why is an atom electrically neutral?
- 20th April 1990State the law of conservation of mass.
- 21st April 1990In the industrial extraction of aluminium, explain why the carbon anodes need to be replaced regularly.
- 22nd April 1990State the condition, in terms of energy, that colliding particles must meet for a reaction to occur.
- 23rd April 1990Give one piece of evidence that a solid sample is impure, based on its melting behaviour.
- 24th April 1990Explain why carbon monoxide is dangerous even though it has no smell.
- 25th April 1990Why can no device be 100 percent efficient?
- 26th April 1990Why is melting described as a physical change?
- 27th April 1990A box has a driving force of 250 N forward and friction of 180 N backward. Calculate the resultant force, including its direction.
- 28th April 1990A wave has a period of 0.005 s. Calculate its frequency.
- 29th April 1990State the difference between a natural satellite and an artificial satellite, and give one example of each.
- 30th April 1990Convert 0.05 mm into micrometres.