Daily Practice · GCSE Science
June 1993 - GCSE Science 5-a-day
Every sheet in June 1993
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st June 1993A source has a half-life of 5 days and an initial activity of 1600 Bq. What is its activity after 15 days?
- 2nd June 1993State two factors that increase a driver's thinking distance.
- 3rd June 1993Name a typical material used to make a permanent magnet, and a typical material used to make an induced (temporary) magnet.
- 4th June 1993State, in one sentence, what the Big Bang model proposes about the early universe.
- 5th June 1993Calculate the surface area to volume ratio of a cube of side 2 cm.
- 6th June 1993Describe how phagocytes destroy pathogens in the body.
- 7th June 1993A yeast culture respires without oxygen. Name the two products of this reaction, and name one industrial process that relies on it.
- 8th June 1993A man who is a known carrier of cystic fibrosis (Ff) has children with a woman who has been confirmed to carry no cystic fibrosis allele at all (FF). Explain why none of their children can have cystic fibrosis.
- 9th June 1993Give the resolution of a burette that can be read to the nearest half of a small division.
- 10th June 1993Why is an atom electrically neutral?
- 11th June 1993State the law of conservation of mass.
- 12th June 1993Concentrated sodium chloride solution (brine) is electrolysed using inert electrodes. State the products formed at the cathode and at the anode.
- 13th June 1993Explain why increasing temperature increases the rate of a reaction, referring to both the frequency and the energy of collisions.
- 14th June 1993Give one piece of evidence that a solid sample is impure, based on its melting behaviour.
- 15th June 1993Explain why carbon monoxide is dangerous even though it has no smell.
- 16th June 1993Why can no device be 100 percent efficient?
- 17th June 1993Why is melting described as a physical change?
- 18th June 1993Calculate the weight of an object of mass 8.0 kg on Earth, where g = 9.8 N/kg.
- 19th June 1993Sound waves travel through a steel rail at approximately 5900 m/s. A sound wave sent along the rail has a frequency of 2950 Hz. Calculate its wavelength.
- 20th June 1993State the eventual fate of a star with a much greater mass than the Sun, after it explodes as a supernova.
- 21st June 1993Convert 0.05 mm into micrometres.
- 22nd June 1993State the function of the valves in the heart and in veins.
- 23rd June 1993Name the gas that is released as a product of photosynthesis.
- 24th June 1993Name the gland often called the body's master gland.
- 25th June 1993The Arctic fox has small, rounded ears compared with the desert fennec fox, which has very large ears. State whether this is a structural, behavioural or functional adaptation, and explain how it helps the Arctic fox survive.
- 26th June 1993Explain why potable water is not required to be chemically pure.
- 27th June 1993Write the formula of calcium chloride and explain the ratio.
- 28th June 1993State the name given to a reaction in which a substance loses electrons.
- 29th June 1993Hydrogen reacts with chlorine to form hydrogen chloride: H2 + Cl2 -> 2HCl. Use the bond energies given to calculate the overall energy change for this reaction. Bond energies: H-H = 436 kJ/mol, Cl-Cl = 243 kJ/mol, H-Cl = 432 kJ/mol.
- 30th June 1993State the number of covalent bonds a carbon atom forms in a saturated hydrocarbon.