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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 1 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 mass of 9 kg has velocity 24 m/s. Find its signed momentum in kg·m/s.
kg·m/s
2Motion and energyA perpendicular force of 243 N acts over 27 m². Find the pressure in Pa.
Pa
3Waves & soundA periodic wave has frequency 30 Hz and wavelength 20 m. Find its speed in m/s.
m/s
4Waves & soundA repeating signal has frequency 131 Hz. Find its period in seconds as a fraction.
s
5Electricity & circuitsAn ideal ohmic resistor of 18 Ω carries 3 A. Find the voltage across it in V.
V
6Electricity & circuitsThree ideal resistors of 81 Ω, 8 Ω and 2 Ω are in series. Find total resistance in Ω.
Ω
7Electricity & circuitsA constant current of 10 A flows for 94 s. How much charge passes in C?
C
8ChemistryAn ideal decay model starts with 46 mg. What expected mass remains after 1 half-lives, in mg?
mg
9ChemistryA hypothetical element has isotopes of mass 42 u (70%) and 44 u (30%). Calculate its mean atomic mass in u.
u
10ChemistryDilute 60 mL of a 2.5 mol/L solution to 0.5 mol/L without losing solute. Find the final volume in mL.
mL
11Biology & geneticsGenetics and inheritance: which term fits this description? An observable characteristic produced through genes and environment.
12Biology & geneticsTo compare pH fairly, which should normally remain controlled?

From Grade 11

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

13Biology & genetics (Grade 11)For Aa × Aa, which genotype class has the largest expected fraction?
14Motion and energy (Grade 11)A device receives 400 J and delivers 180 J of useful energy. Find its efficiency as a percentage.
%
15Chemistry (Grade 11)In a simplified isotope exercise, atomic number Z = 21 and mass number A = 49. How many neutrons?