StudyBrixFree worksheets, study guides and courses

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 5 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 882 g and volume 63 cm³. Calculate density in g/cm³.
g/cm³
2Matter & forcesA model vehicle travels 3520 m in 44 s at constant speed. What is its speed in m/s?
m/s
3Motion and energyA device transfers 680 J in 34 s. Find average power in W.
W
4Motion and energyA device receives 4600 J and delivers 1380 J of useful energy. Find its efficiency as a percentage.
%
5Waves & soundA periodic wave has frequency 43 Hz and wavelength 28 m. Find its speed in m/s.
m/s
6Waves & soundA periodic wave has frequency 40 Hz and wavelength 24 m. Find its speed in m/s.
m/s
7Electricity & circuitsAn ideal ohmic resistor of 77 Ω carries 9 A. Find the voltage across it in V.
V
8Electricity & circuitsA constant current of 9 A flows for 32 s. How much charge passes in C?
C
9ChemistryIn a simplified isotope exercise, atomic number Z = 2 and mass number A = 32. How many neutrons?
10ChemistryAn atom has 13 protons and 14 neutrons. What is its mass number?
11Earth & spaceSpace and the solar system: which term fits this description? The third planet from the Sun.
12Earth & spaceEarth systems: which term fits this description? Water stored in saturated spaces beneath the ground.
13Biology & geneticsEcosystems and interactions: which term fits this description? A community of organisms together with its non-living environment.
14Biology & geneticsFor Aa × Aa, which genotype class has the largest expected fraction?

From Grade 7

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

15Inquiry (Grade 7)Which instrument is suited to measuring temperature?
16Matter & forces (Grade 7)Matter and changes: which term fits this description? A change from liquid to solid.