Daily Practice · GCSE Science
July 1999 - GCSE Science 5-a-day
Every GCSE Science sheet published in July 1999, with answers. Biology, chemistry and physics recall, definition and calculation, drawn from every strand.
Every sheet in July 1999
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st July 1999A man has genotype XY. State his sex, and state which sex chromosomes are found in the sperm cells he produces.
- 2nd July 1999In the rate experiment where a cross disappears, why is the result subjective?
- 3rd July 1999An atom has an atomic number of 17 and a mass number of 37. How many neutrons does it have?
- 4th July 1999Calculate the number of moles in 20 g of calcium carbonate. (Mr = 100)
- 5th July 1999In the industrial extraction of aluminium, explain why the aluminium oxide is dissolved in molten cryolite rather than melted on its own.
- 6th July 1999Explain why increasing the surface area of a solid reactant increases the rate of a reaction.
- 7th July 1999A solid gives a lilac flame test. Name the metal ion present.
- 8th July 1999Name the two additional products that can form during the incomplete combustion of a hydrocarbon fuel.
- 9th July 1999Give the equation for efficiency in terms of energy.
- 10th July 1999Calculate the mass of 0.5 cubic metres of a material of density 2400 kilograms per cubic metre.
- 11th July 1999A gardener pushes a mower with a force of 60 N through a distance of 8.0 m. Calculate the work done. Use W = F x s.
- 12th July 1999A wave has a frequency of 50 Hz. Calculate its period.
- 13th July 1999Explain, in terms of forces, why an orbiting satellite does not travel off in a straight line.
- 14th July 1999State the function of the mitochondria.
- 15th July 1999Which component of blood transports carbon dioxide, urea and hormones?
- 16th July 1999Name the organelle in a plant cell where photosynthesis takes place.
- 17th July 1999State one risk factor linked to type 2 diabetes.
- 18th July 1999A student places ten 1 m x 1 m quadrats at random across a school field of area 3000 m2 and counts a total of 45 dandelions across all ten quadrats. Estimate the total number of dandelions on the field.
- 19th July 1999Name one method used to sterilise fresh water during the production of potable water.
- 20th July 1999Why can metals conduct electricity when solid?
- 21st July 1999Write the word equation for the reaction between zinc and hydrochloric acid.
- 22nd July 1999State whether forming a new chemical bond requires energy or releases energy.
- 23rd July 1999Define the term 'homologous series'.
- 24th July 1999State the approximate percentage of nitrogen in today's atmosphere.
- 25th July 1999A spring is compressed. Which energy store increases?
- 26th July 1999What is the difference between alternating and direct current?
- 27th July 1999What observation showed that the atom is mostly empty space?
- 28th July 1999Write down the equation that links moment, force and distance.
- 29th July 1999A wire of length 0.20 m carries a current of 5.0 A at right angles to a magnetic field of flux density 0.60 T. Calculate the force on the wire.
- 30th July 1999In the microbiology practical, why are agar plates incubated at 25 degrees Celsius in schools rather than at 37 degrees Celsius?
- 31st July 1999Name the organ system responsible for breaking food down into small, soluble molecules.