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 1 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 95 g and volume 5 cm³. Calculate density in g/cm³.
g/cm³
2Matter & forcesA model vehicle travels 2394 m in 42 s at constant speed. What is its speed in m/s?
m/s
3Motion and energyA device transfers 1470 J in 21 s. Find average power in W.
W
4Motion and energyAn object moves at constant velocity -18 m/s for 12 s. Find displacement in m.
m
5Waves & soundA periodic wave has frequency 8 Hz and wavelength 24 m. Find its speed in m/s.
m/s
6Waves & soundA periodic wave has frequency 7 Hz and wavelength 1 m. Find its speed in m/s.
m/s
7Electricity & circuitsA constant current of 4 A flows for 111 s. How much charge passes in C?
C
8Electricity & circuitsAn ideal ohmic resistor of 9 Ω carries 8 A. Find the voltage across it in V.
V
9ChemistryIn a simplified isotope exercise, atomic number Z = 20 and mass number A = 26. How many neutrons?
10ChemistryAtomic structure and chemical language: which term fits this description? A reaction that absorbs heat from the surroundings under the specified conditions.
11Earth & spaceSpace and the solar system: which term fits this description? The eighth planet from the Sun.
12Earth & spaceRainfall on four days is 2, 0, 5 and 3 mm. Find the total rainfall in mm.
13Biology & geneticsCells and cell structures: which term fits this description? Membrane transport that requires energy to move substances against an electrochemical gradient.
14Biology & geneticsEcosystems and interactions: which term fits this description? The variety of life, including diversity of genes, species and ecosystems.

From Grade 7

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

15Matter & forces (Grade 7)Matter and changes: which term fits this description? The substance described as being dissolved in a solution.
16Inquiry (Grade 7)A length is 3.5 m. Convert it to cm.