Daily Practice · GCSE Science
September 1990 5-a-day
Every sheet in September 1990
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st September 1990Name the type of biological molecule formed when amino acid monomers join together by condensation polymerisation.
- 2nd September 1990State two long-term stores of carbon that removed carbon dioxide from the early atmosphere.
- 3rd September 1990State the equation for gravitational potential energy.
- 4th September 1990Calculate the energy needed to melt 0.50 kg of a substance with a specific latent heat of fusion of 210000 J/kg.
- 5th September 1990Radium-226 (atomic number 88) decays by alpha emission. State the atomic number of the nucleus formed.
- 6th September 1990A radio wave has a wavelength of 3 m. Calculate its frequency, given that all electromagnetic waves travel at 3 x 10^8 m/s in a vacuum.
- 7th September 1990Explain why electricity is transmitted through the National Grid at a very high voltage rather than at the voltage used in homes.
- 8th September 1990Name the structure in a plant cell that controls the substances entering and leaving the cell.
- 9th September 1990Explain what happens to an enzyme above its optimum temperature.
- 10th September 1990Name three non-specific defences of the human body.
- 11th September 1990Name the chemical released at a synapse that carries the signal across the gap.
- 12th September 1990Explain why deforestation to create land for cattle grazing can reduce biodiversity.
- 13th September 1990Name two methods of desalinating seawater.
- 14th September 1990Name the giant covalent structure made of carbon in which each carbon atom is bonded to four others.
- 15th September 1990Convert a concentration of 0.20 moles per cubic decimetre of NaOH into grams per cubic decimetre. (Mr = 40)
- 16th September 1990State the energy transfer that occurs during an exothermic reaction.
- 17th September 1990State two products, other than water, that can be formed during the incomplete combustion of a hydrocarbon.
- 18th September 1990In a chromatography experiment, a dye spot travels 4.5 cm and the solvent front travels 6.0 cm. Calculate its Rf value.
- 19th September 1990Define the resolution of a measuring instrument.
- 20th September 1990Two 4 ohm resistors are connected in series. Calculate the total resistance.
- 21st September 1990Which type of radiation is stopped by a sheet of paper?
- 22nd September 1990Explain why a larger vehicle mass increases braking distance.
- 23rd September 1990State the type of force that always acts between an induced magnet and the magnet that induced it.
- 24th September 1990Name the model of the origin of the universe that is supported by red-shift observations.
- 25th September 1990Why does active transport require energy?
- 26th September 1990Describe how phagocytes destroy pathogens in the body.
- 27th September 1990Define oxygen debt.
- 28th September 1990Explain one benefit of the Human Genome Project.
- 29th September 1990Name one way to make a rate of reaction experiment more valid rather than simply more precise.
- 30th September 1990Define an isotope.