Daily Practice · GCSE Science
January 2003 - GCSE Science 5-a-day
Every GCSE Science sheet published in January 2003, with answers. Biology, chemistry and physics recall, definition and calculation, drawn from every strand.
Every sheet in January 2003
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st January 2003A peat bog covered an area of 850 hectares in 2015. By 2025, drainage for farmland had reduced the peat bog to 680 hectares. Calculate the percentage decrease in the area of the peat bog.
- 2nd January 2003Explain why steel (an alloy of iron and carbon) is generally harder than pure iron.
- 3rd January 2003Why do polymers have higher melting points than small molecules such as methane?
- 4th January 2003Complete: acid + metal carbonate gives ...
- 5th January 2003State the four factors that can increase the rate of a chemical reaction.
- 6th January 2003Explain why carboxylic acids are described as 'weak acids'.
- 7th January 2003Explain, in one sentence, why the oceans were able to form only after the early Earth had cooled.
- 8th January 2003By what factor does kinetic energy increase if speed is doubled?
- 9th January 2003A 1.5 kg block of iron is heated from 18 degrees C to 98 degrees C. The specific heat capacity of iron is 450 J/(kg degrees C). Calculate the change in thermal energy.
- 10th January 2003Define the term 'half-life' of a radioactive isotope.
- 11th January 2003Explain why ultraviolet radiation can be harmful to human skin.
- 12th January 2003State two ways of inducing a potential difference across a conductor using a magnetic field.
- 13th January 2003State one structure found in a bacterial cell but not in an animal cell.
- 14th January 2003Describe the positive result of the Biuret test.
- 15th January 2003What is tested during preclinical testing?
- 16th January 2003A 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.
- 17th January 2003Name the equipment used to measure the abundance of a small plant species within a sample area.
- 18th January 2003Define a finite resource, giving one example.
- 19th January 2003State one reason why simple covalent substances such as chlorine have low melting points.
- 20th January 2003Why do companies prefer reactions with a high atom economy?
- 21st January 2003On a reaction profile diagram, the reactants are drawn at a higher energy level than the products. State whether the reaction is exothermic or endothermic.
- 22nd January 2003Define the term 'hydrocarbon'.
- 23rd January 2003Explain why the solvent level in the container must be below the pencil baseline.
- 24th January 2003In the specific heat capacity practical, why is the block insulated?
- 25th January 2003Describe the current-potential difference graph for a filament lamp.
- 26th January 2003State the difference between irradiation and contamination.
- 27th January 2003A shopping trolley has a mass of 25 kg. Calculate its weight, taking g = 9.8 N/kg.
- 28th January 2003A student wraps a coil of insulated wire around an iron nail and connects it to a battery. Name the device this creates, and state one way to increase its magnetic field strength.
- 29th January 2003Explain why red-shift observations support the idea that the universe is expanding, rather than Earth simply being at the centre of the universe with everything moving away from it.
- 30th January 2003Name the process that moves substances against a concentration gradient.
- 31st January 2003A student measures the mean diameter of a zone of inhibition as 12 mm. Calculate its radius.