Daily Practice · GCSE Science
January 1985 5-a-day
Every sheet in January 1985
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st January 1985Why is the amount of product directly proportional to the amount of limiting reactant?
- 2nd January 1985State whether the combustion of methane is exothermic or endothermic.
- 3rd January 1985State what is meant by dynamic equilibrium.
- 4th January 1985A solution forms a green precipitate with sodium hydroxide solution. Which ion is present?
- 5th January 1985Give the equation for wave speed and its units.
- 6th January 1985Two resistors are connected in parallel across a 12 V battery. State the potential difference across each resistor.
- 7th January 1985Why does reducing the volume of a gas increase the pressure even though the molecules do not speed up?
- 8th January 1985A skydiver reaches terminal velocity during free fall. Explain what is meant by 'terminal velocity'.
- 9th January 1985State the seven regions of the electromagnetic spectrum in order of increasing frequency.
- 10th January 1985State what provides the centripetal force that keeps a planet in orbit around the Sun.
- 11th January 1985Give one risk of stem cell treatment.
- 12th January 1985Why does a potometer measure water uptake rather than transpiration directly?
- 13th January 1985Why does the rate of photosynthesis fall at very high temperatures?
- 14th January 1985Define the term allele.
- 15th January 1985Explain why large-scale deforestation increases the concentration of carbon dioxide in the atmosphere.
- 16th January 1985State the four stages considered in a life cycle assessment.
- 17th January 1985Why does simple molecular carbon dioxide have a much lower melting point than giant covalent silicon dioxide?
- 18th January 1985Define oxidation in terms of electrons.
- 19th January 1985State two units that the rate of a reaction can be measured in.
- 20th January 1985Explain why carboxylic acids are described as 'weak acids'.
- 21st January 1985Explain why the natural greenhouse effect is necessary for life on Earth, rather than being a purely harmful process.
- 22nd January 1985A 3 kg object is raised 2 m. Calculate the gravitational potential energy gained. (g = 9.8 N/kg)
- 23rd January 1985State the correct SI unit for density.
- 24th January 1985A GM tube detects a count rate of 240 counts per minute from a source. After 15 days the count rate has fallen to 30 counts per minute. Show that this data is consistent with a half-life of 5 days.
- 25th January 1985Explain why ultraviolet radiation can be harmful to human skin.
- 26th January 1985State two ways of inducing a potential difference across a conductor using a magnetic field.
- 27th January 1985Convert 0.02 mm into micrometres (um).
- 28th January 1985State two functions of bile.
- 29th January 1985What is an antigen?
- 30th January 1985A ruler is released and falls 20 cm before being caught. Using distance = 0.5 x g x time^2 with g = 9.8 m/s^2, calculate the reaction time, to 3 significant figures.
- 31st January 1985Name the equipment used to measure the abundance of a small plant species within a sample area.