Daily Practice · GCSE Science
October 1990 5-a-day
Every sheet in October 1990
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st October 1990A sealed flask containing 12.0 g of reactants is shaken and a reaction occurs. What is the total mass afterwards?
- 2nd October 1990Explain why solid sodium chloride does not conduct electricity, but molten sodium chloride does.
- 3rd October 1990In the gas-volume required practical measuring how concentration affects rate, state one variable that should be controlled.
- 4th October 1990State the difference between a pure substance and a formulation.
- 5th October 1990Explain why burning a fuel can produce nitrogen oxides even if the fuel itself contains no nitrogen.
- 6th October 1990Name three renewable energy resources.
- 7th October 1990State the equation for density.
- 8th October 1990Calculate the weight of an object of mass 8.0 kg on Earth, where g = 9.8 N/kg.
- 9th October 1990A wave travels from air into glass and slows down. State what happens to its direction, and explain why in terms of wavelength.
- 10th October 1990State what a nebula is, and explain its role in the life cycle of a star.
- 11th October 1990Why is a stain such as iodine used when preparing a slide?
- 12th October 1990Give two adaptations of a red blood cell.
- 13th October 1990Name the gas that is released as a product of photosynthesis.
- 14th October 1990Name the hormone released by the adrenal glands that prepares the body for fight or flight.
- 15th October 1990Explain why a pyramid of biomass is never wider at the top than at the bottom.
- 16th October 1990Explain why potable water is not required to be chemically pure.
- 17th October 1990Define a covalent bond.
- 18th October 1990State the name given to a reaction in which a substance loses electrons.
- 19th October 1990State the difference between a rechargeable cell and a non-rechargeable cell.
- 20th October 1990State the general formula of the alkenes.
- 21st October 1990Give two processes that removed carbon dioxide from the early atmosphere.
- 22nd October 1990Calculate the kinetic energy of a 2.0 kg trolley moving at 4.0 m/s.
- 23rd October 1990Calculate the current drawn by a 1150 W kettle on a 230 V supply.
- 24th October 1990State the approximate radius of a nucleus compared with the radius of an atom.
- 25th October 1990A box of weight 120 N has a base area of 0.40 m^2. Calculate the pressure it exerts on the ground.
- 26th October 1990Explain why a current-carrying wire positioned exactly parallel to a magnetic field experiences no force.
- 27th October 1990State the difference between resolution and accuracy.
- 28th October 1990Explain why the rate of an enzyme-controlled reaction decreases sharply above the enzyme's optimum temperature.
- 29th October 1990How do bacteria make a person feel ill?
- 30th October 1990Name the three parts common to every homeostatic control system.
- 31st October 1990State one advantage and one disadvantage of selective breeding in farm animals.