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Grade 8 · Science

Grade 8 Science diagnostic

16 questions on matter & forces, motion and energy, waves & sound, electricity & circuits, chemistry, earth & space and biology & genetics, plus 2 from Grade 7. Answer what you can, then check your answers to see which topics are secure and what to practise next.

16 questions7 topicsAbout 20 minutesSet 4 of 5

Skip a question if you do not know the answer. It is better than guessing, because it shows what to practise.

1Matter & forcesA sample has mass 1034 g and volume 47 cm³. Calculate density in g/cm³.
g/cm³
2Matter & forcesA model vehicle travels 672 m in 42 s at constant speed. What is its speed in m/s?
m/s
3Motion and energyAn object moves at constant velocity -24 m/s for 11 s. Find displacement in m.
m
4Motion and energyLift a 6 kg mass vertically by 12 m. Using g = 10 m/s², find the increase in gravitational potential energy in J.
J
5Waves & soundA periodic wave has frequency 28 Hz and wavelength 25 m. Find its speed in m/s.
m/s
6Waves & soundA periodic wave has frequency 53 Hz and wavelength 10 m. Find its speed in m/s.
m/s
7Electricity & circuitsAn ideal ohmic resistor of 35 Ω carries 10 A. Find the voltage across it in V.
V
8Electricity & circuitsWaves and electric circuits: which term fits this description? The maximum displacement from equilibrium for an oscillation.
9ChemistryIn a simplified isotope exercise, atomic number Z = 21 and mass number A = 25. How many neutrons?
10ChemistryAtomic structure and chemical language: which term fits this description? An atom with the same proton number as another atom but a different neutron number.
11Earth & spaceEarth systems: which term fits this description? Long-term patterns and statistics of weather in a region.
12Earth & spaceSpace and the solar system: which term fits this description? The eighth planet from the Sun.
13Biology & geneticsEcosystems and interactions: which term fits this description? A single sequence showing transfer through feeding relationships.
14Biology & geneticsCells and cell structures: which term fits this description? An organized DNA-containing structure carrying genetic information.

From Grade 7

These questions check skills from the grade below, so gaps can be spotted early.

15Inquiry (Grade 7)Which unit is appropriate for the mass of a small apple?
16Matter & forces (Grade 7)Matter and changes: which term fits this description? A change in form or state without forming a different chemical substance.