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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 3 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 model vehicle travels 868 m in 14 s at constant speed. What is its speed in m/s?
m/s
2Matter & forcesA sample has mass 244 g and volume 61 cm³. Calculate density in g/cm³.
g/cm³
3Motion and energyLift a 11 kg mass vertically by 7 m. Using g = 10 m/s², find the increase in gravitational potential energy in J.
J
4Motion and energyA device receives 6700 J and delivers 5360 J of useful energy. Find its efficiency as a percentage.
%
5Waves & soundA periodic wave has frequency 13 Hz and wavelength 5 m. Find its speed in m/s.
m/s
6Waves & soundA periodic wave has frequency 39 Hz and wavelength 11 m. Find its speed in m/s.
m/s
7Electricity & circuitsAn ideal ohmic resistor of 44 Ω carries 12 A. Find the voltage across it in V.
V
8Electricity & circuitsA constant current of 6 A flows for 87 s. How much charge passes in C?
C
9ChemistryIn a simplified isotope exercise, atomic number Z = 3 and mass number A = 32. How many neutrons?
10ChemistryHow many oxygen atoms are in one formula unit of Ca(NO₃)₂?
11Earth & spaceEarth systems: which term fits this description? The thick rocky region between Earth's crust and core.
12Earth & spaceSpace and the solar system: which term fits this description? Orbital motion of one body around another.
13Biology & geneticsEcosystems and interactions: which term fits this description? An organism that makes organic food from inorganic materials using an energy source.
14Biology & geneticsIs water temperature a living or nonliving environmental factor?

From Grade 7

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

15Inquiry (Grade 7)A length is 3.5 m. Convert it to cm.
16Matter & forces (Grade 7)Matter and changes: which term fits this description? A change from liquid to solid.