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Grade 12 · Science

Grade 12 Science diagnostic

15 questions on motion and energy, waves & sound, electricity & circuits, chemistry and biology & genetics, plus 3 from Grade 11. Answer what you can, then check your answers to see which topics are secure and what to practise next.

15 questions5 topicsAbout 15 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.

1Motion and energyA 6 kg sample has specific heat 400 J/(kg·°C). Its temperature rises 20°C with no phase change. Find the energy gained in J.
J
2Motion and energyA 16 kg object has speed 7 m/s. Find its classical kinetic energy in J.
J
3Waves & soundA repeating signal has frequency 24 Hz. Find its period in seconds as a fraction.
s
4Waves & soundA periodic wave has frequency 54 Hz and wavelength 6 m. Find its speed in m/s.
m/s
5Electricity & circuitsResistors of 38 Ω and 12 Ω are connected in parallel. Find the equivalent resistance in Ω as an exact fraction or integer.
Ω
6Electricity & circuitsA steady DC device operates at 4 V and 6 A. Find power in W.
W
7Electricity & circuitsA constant current of 4 A flows for 3 s. How much charge passes in C?
C
8ChemistryDilute 170 mL of a 1.5 mol/L solution to 0.5 mol/L without losing solute. Find the final volume in mL.
mL
9ChemistryA hypothetical element has isotopes of mass 31 u (5%) and 32 u (95%). Calculate its mean atomic mass in u.
u
10ChemistryAn ideal decay model starts with 864 mg. What expected mass remains after 4 half-lives, in mg?
mg
11Biology & geneticsGenotype refers here to
12Biology & geneticsGenetics and inheritance: which term fits this description? A three-nucleotide RNA sequence specifying an amino acid or translation signal.

From Grade 11

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

13Motion and energy (Grade 11)Lift a 4 kg mass vertically by 26 m. Using g = 10 m/s², find the increase in gravitational potential energy in J.
J
14Biology & genetics (Grade 11)For Aa × aa, what fraction of expected offspring genotypes are aa? Give a fraction.
15Chemistry (Grade 11)In a simplified isotope exercise, atomic number Z = 26 and mass number A = 44. How many neutrons?