Daily Practice · GCSE Science
April 1993 5-a-day
Every sheet in April 1993
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st April 1993Which component of blood transports carbon dioxide, urea and hormones?
- 2nd April 1993Complete the word equation for anaerobic respiration in yeast: glucose -> ___ + ___
- 3rd April 1993Explain why sweating cools the body down.
- 4th April 1993A student places ten 1 m x 1 m quadrats at random across a school field of area 3000 m2 and counts a total of 45 dandelions across all ten quadrats. Estimate the total number of dandelions on the field.
- 5th April 1993Give one reason distillation of seawater requires a large energy input.
- 6th April 1993Why can metals conduct electricity when solid?
- 7th April 1993A student reacts 2.4 g of magnesium with excess dilute hydrochloric acid: Mg + 2HCl -> MgCl2 + H2. Relative atomic mass of Mg = 24. Calculate the number of moles of hydrogen gas produced.
- 8th April 1993State whether forming a new chemical bond requires energy or releases energy.
- 9th April 1993Name the catalyst used when an alkene reacts with hydrogen to form an alkane.
- 10th April 1993Name the two gases released in large amounts by volcanic activity that formed most of the Earth's early atmosphere.
- 11th April 1993Name the energy store associated with a moving car.
- 12th April 1993What is the difference between alternating and direct current?
- 13th April 1993What observation showed that the atom is mostly empty space?
- 14th April 1993A force of 40 N is applied 0.25 m from a pivot. Calculate the moment.
- 15th April 1993A rectangular coil carrying a current is placed in a magnetic field, with its two long sides parallel to each other. Explain why the coil rotates rather than moving in a straight line.
- 16th April 1993In the microbiology practical, why are agar plates incubated at 25 degrees Celsius in schools rather than at 37 degrees Celsius?
- 17th April 1993State the type of large biological molecule that all enzymes are made from.
- 18th April 1993Why can HIV not be treated with antibiotics?
- 19th April 1993Define homeostasis.
- 20th April 1993Give one example of variation that is caused purely by the environment rather than by genes.
- 21st April 1993A sample contains 90% of an isotope with mass number 10 and 10% of an isotope with mass number 11. Calculate the relative atomic mass, to 1 decimal place.
- 22nd April 1993State the trend in reactivity down group 7 and name the most reactive halogen listed on the periodic table.
- 23rd April 1993Define the limiting reactant.
- 24th April 1993Using the values in the previous question, calculate the overall energy change for the reaction.
- 25th April 1993In the Haber process, state the effect of removing some ammonia from the equilibrium mixture as it forms on the position of equilibrium.
- 26th April 1993Explain how the sodium hydroxide test distinguishes aluminium ions from calcium ions, given that both give a white precipitate.
- 27th April 1993Why should you write down the equation even if you cannot finish the calculation?
- 28th April 1993A resistor of resistance 15 ohm is connected to a 6.0 V supply. Calculate the current flowing through it. Use V = I x R.
- 29th April 1993What causes the pressure of a gas on the walls of its container?
- 30th April 1993A runner completes a 400 m race in 52 s. Calculate her average speed, giving your answer to 3 significant figures.