Daily Practice · GCSE Science
January 1992 5-a-day
Every sheet in January 1992
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st January 1992A 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 1992Explain why steel (an alloy of iron and carbon) is generally harder than pure iron.
- 3rd January 1992Why do polymers have higher melting points than small molecules such as methane?
- 4th January 1992Complete: acid + metal carbonate gives ...
- 5th January 1992State the four factors that can increase the rate of a chemical reaction.
- 6th January 1992Name the small molecule typically released as a by-product during condensation polymerisation.
- 7th January 1992State two long-term stores of carbon that removed carbon dioxide from the early atmosphere.
- 8th January 1992By what factor does kinetic energy increase if speed is doubled?
- 9th January 1992Calculate the energy needed to melt 0.50 kg of a substance with a specific latent heat of fusion of 210000 J/kg.
- 10th January 1992Define the term 'half-life' of a radioactive isotope.
- 11th January 1992A water wave has a frequency of 4 Hz and a wavelength of 0.5 m. Calculate its speed.
- 12th January 1992A transformer's primary coil is connected to a 12 V supply and has 60 turns. Calculate the number of turns needed on the secondary coil to produce an output of 3.0 V.
- 13th January 1992Name the structure in a plant cell that controls the substances entering and leaving the cell.
- 14th January 1992Describe the positive result of the Biuret test.
- 15th January 1992What is tested during preclinical testing?
- 16th January 1992Define a synapse.
- 17th January 1992Give one example of an abiotic factor that could affect where a plant species grows.
- 18th January 1992Name two methods of desalinating seawater.
- 19th January 1992Name the giant covalent structure made of carbon in which each carbon atom is bonded to four others.
- 20th January 1992Why do companies prefer reactions with a high atom economy?
- 21st January 1992On 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 1992State the general formula of the alkanes.
- 23rd January 1992Explain why the solvent level in the container must be below the pencil baseline.
- 24th January 1992In the specific heat capacity practical, why is the block insulated?
- 25th January 1992Describe the current-potential difference graph for a filament lamp.
- 26th January 1992State the difference between irradiation and contamination.
- 27th January 1992Calculate the momentum of a 1200 kg car travelling at 18 m/s.
- 28th January 1992Explain why a compass needle placed just outside one end of a current-carrying solenoid lines up parallel to the solenoid's axis.
- 29th January 1992Name the second major piece of observational evidence, besides red-shift, that supports the Big Bang model.
- 30th January 1992Name the process that moves substances against a concentration gradient.
- 31st January 1992Describe how phagocytes destroy pathogens in the body.