Daily Practice · GCSE Science
October 1993 - GCSE Science 5-a-day
Every sheet in October 1993
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st October 1993State what is meant by a selection pressure.
- 2nd October 1993Explain, in terms of electrons, why reactivity decreases going down Group 7.
- 3rd October 1993Why are the noble gases unreactive?
- 4th October 1993How many atoms are there in 0.5 mol of helium?
- 5th October 1993Explain, in terms of bonds, why breaking bonds is an endothermic process.
- 6th October 1993State Le Chatelier's principle in your own words.
- 7th October 1993Describe the test, and the positive result, for ammonium ions.
- 8th October 1993Convert 3.5 kJ into joules.
- 9th October 1993In a series circuit, the current through one lamp is 0.30 A. State the current through a second lamp in the same circuit.
- 10th October 1993How is the temperature of a gas related to the motion of its molecules?
- 11th October 1993On a velocity-time graph, what does the area between the line and the time axis represent?
- 12th October 1993State the speed of all electromagnetic waves travelling through a vacuum.
- 13th October 1993State the name of the force that keeps a satellite in orbit around the Earth.
- 14th October 1993How many pairs of chromosomes are there in a human body cell?
- 15th October 1993Where are most stomata found on a typical leaf, and why?
- 16th October 1993Name four limiting factors of photosynthesis.
- 17th October 1993A plant grown in the shade is shorter than a genetically identical plant of the same species grown in full sunlight. State whether this difference is genetic variation, environmental variation, or both.
- 18th October 1993State what is meant by the term biodiversity.
- 19th October 1993Give one reason a manufacturer's own life cycle assessment of its product might not be fully objective.
- 20th October 1993Give one use of nanoparticles and one associated risk.
- 21st October 1993Give the ionic equation for neutralisation.
- 22nd October 1993State what is shown on a rate graph when the line for the volume of gas produced becomes horizontal (flat).
- 23rd October 1993Name the small molecule typically released as a by-product during condensation polymerisation.
- 24th October 1993Describe, in terms of wavelength, the difference between the radiation the Earth receives from the Sun and the radiation it re-emits from its surface.
- 25th October 1993State the equation for gravitational potential energy.
- 26th October 1993State what happens to the internal energy of a substance as it is heated, in terms of the kinetic and potential energy of its particles.
- 27th October 1993Radium-226 (atomic number 88) decays by alpha emission. State the atomic number of the nucleus formed.
- 28th October 1993A water wave has a frequency of 4 Hz and a wavelength of 0.5 m. Calculate its speed.
- 29th October 1993A 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.
- 30th October 1993A microscope has a x10 eyepiece lens and a x20 objective lens. Calculate the total magnification.
- 31st October 1993Explain what happens to an enzyme above its optimum temperature.