Daily Practice · GCSE Science
October 1999 - GCSE Science 5-a-day
Every GCSE Science sheet published in October 1999, with answers. Biology, chemistry and physics recall, definition and calculation, drawn from every strand.
Every sheet in October 1999
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st October 1999A box has a driving force of 250 N forward and friction of 180 N backward. Calculate the resultant force, including its direction.
- 2nd October 1999A wave travels from air into glass and slows down. State what happens to its direction, and explain why in terms of wavelength.
- 3rd October 1999State what a nebula is, and explain its role in the life cycle of a star.
- 4th October 1999Convert 0.05 mm into micrometres.
- 5th October 1999State the function of the valves in the heart and in veins.
- 6th October 1999Explain why anaerobic respiration releases much less energy per glucose molecule than aerobic respiration.
- 7th October 1999Name the hormone released by the adrenal glands that prepares the body for fight or flight.
- 8th October 1999The 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.
- 9th October 1999State what is meant by sustainable development.
- 10th October 1999Write the formula of calcium chloride and explain the ratio.
- 11th October 1999State the pH value of a neutral solution.
- 12th October 1999Hydrogen 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.
- 13th October 1999State the general formula of the alkenes.
- 14th October 1999Explain, in terms of infrared radiation, how greenhouse gases keep the Earth warm.
- 15th October 1999A motor is supplied with 800 J of energy and wastes 240 J as heat. Calculate its efficiency as a percentage.
- 16th October 1999Give the equation linking energy transferred, charge flow and potential difference.
- 17th October 1999Who provided the evidence for the existence of the neutron, and roughly when relative to the nuclear model?
- 18th October 1999A box of weight 120 N has a base area of 0.40 m^2. Calculate the pressure it exerts on the ground.
- 19th October 1999Explain why a current-carrying wire positioned exactly parallel to a magnetic field experiences no force.
- 20th October 1999Why does taking repeat readings and calculating a mean improve the data?
- 21st October 1999An amylase reaction is complete after 200 seconds. Calculate the rate of reaction using rate = 1000 / time.
- 22nd October 1999State two ways measles is prevented from spreading.
- 23rd October 1999Name the three parts common to every homeostatic control system.
- 24th October 1999State one advantage and one disadvantage of selective breeding in farm animals.
- 25th October 1999An atom has atomic number 11 and mass number 23. State the number of protons.
- 26th October 1999Give two observations when lithium is added to water.
- 27th October 1999State the value of the Avogadro constant and what it counts.
- 28th October 1999State whether the combustion of methane is exothermic or endothermic.
- 29th October 1999In the Haber process, N2(g) + 3H2(g) -> 2NH3(g), state the effect of decreasing the pressure on the position of equilibrium.
- 30th October 1999Write the ionic equation for the precipitation reaction between barium ions and sulfate ions.
- 31st October 1999Write the equation linking power, energy and time, and rearrange it for time.