Daily Practice · GCSE Science
April 1981 5-a-day
Every sheet in April 1981
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st April 1981Radium-226 (atomic number 88) decays by alpha emission. State the atomic number of the nucleus formed.
- 2nd April 1981A water wave has a frequency of 4 Hz and a wavelength of 0.5 m. Calculate its speed.
- 3rd April 1981A 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.
- 4th April 1981Name the structure in a plant cell that controls the substances entering and leaving the cell.
- 5th April 1981Explain what happens to an enzyme above its optimum temperature.
- 6th April 1981Name three non-specific defences of the human body.
- 7th April 1981Define a synapse.
- 8th April 1981Give one example of an abiotic factor that could affect where a plant species grows.
- 9th April 1981Name two methods of desalinating seawater.
- 10th April 1981Name the giant covalent structure made of carbon in which each carbon atom is bonded to four others.
- 11th April 1981Convert a concentration of 0.20 moles per cubic decimetre of NaOH into grams per cubic decimetre. (Mr = 40)
- 12th April 1981State the energy transfer that occurs during an exothermic reaction.
- 13th April 1981State the general formula of the alkanes.
- 14th April 1981In a chromatography experiment, a dye spot travels 4.5 cm and the solvent front travels 6.0 cm. Calculate its Rf value.
- 15th April 1981Define the resolution of a measuring instrument.
- 16th April 1981Two 4 ohm resistors are connected in series. Calculate the total resistance.
- 17th April 1981Which type of radiation is stopped by a sheet of paper?
- 18th April 1981Calculate the momentum of a 1200 kg car travelling at 18 m/s.
- 19th April 1981Explain why a compass needle placed just outside one end of a current-carrying solenoid lines up parallel to the solenoid's axis.
- 20th April 1981Name the second major piece of observational evidence, besides red-shift, that supports the Big Bang model.
- 21st April 1981Why does active transport require energy?
- 22nd April 1981Describe how phagocytes destroy pathogens in the body.
- 23rd April 1981A student counts 19 pulse beats in 10 seconds immediately after running. Calculate her heart rate in beats per minute.
- 24th April 1981State how many chromosomes are found in a normal human body cell, and how they are arranged.
- 25th April 1981Name one way to make a rate of reaction experiment more valid rather than simply more precise.
- 26th April 1981Define an isotope.
- 27th April 1981A sealed flask containing 12.0 g of reactants is shaken and a reaction occurs. What is the total mass afterwards?
- 28th April 1981In the industrial extraction of aluminium, explain why the carbon anodes need to be replaced regularly.
- 29th April 1981State the condition, in terms of energy, that colliding particles must meet for a reaction to occur.
- 30th April 1981State the difference between a pure substance and a formulation.