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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 2 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 1496 g and volume 68 cm³. Calculate density in g/cm³.
g/cm³
2Matter & forcesA model vehicle travels 2684 m in 44 s at constant speed. What is its speed in m/s?
m/s
3Motion and energyAn object moves at constant velocity 17 m/s for 33 s. Find displacement in m.
m
4Motion and energyA perpendicular force of 2375 N acts over 25 m². Find the pressure in Pa.
Pa
5Waves & soundA periodic wave has frequency 5 Hz and wavelength 10 m. Find its speed in m/s.
m/s
6Waves & soundA periodic wave has frequency 78 Hz and wavelength 7 m. Find its speed in m/s.
m/s
7Electricity & circuitsAn ideal ohmic resistor of 53 Ω carries 1 A. Find the voltage across it in V.
V
8Electricity & circuitsA constant current of 8 A flows for 103 s. How much charge passes in C?
C
9ChemistryIn a simplified isotope exercise, atomic number Z = 2 and mass number A = 28. How many neutrons?
10ChemistryAtomic structure and chemical language: which term fits this description? The SI unit of amount of substance, containing exactly 6.02214076 × 10²³ specified entities.
11Earth & spaceEarth systems: which term fits this description? Rock changed by heat, pressure or fluids without fully melting.
12Earth & spaceWater vapour becoming tiny liquid droplets is
13Biology & geneticsFor Aa × aa, what fraction of expected offspring genotypes are aa? Give a fraction.
14Biology & geneticsFor Aa × Aa, what fraction is expected to be AA?

From Grade 7

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

15Inquiry (Grade 7)Which instrument directly measures duration?
16Matter & forces (Grade 7)Matter and changes: which term fits this description? Mass per unit volume.