StudyBrixFree worksheets, study guides and courses

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 4 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 3 kg sample has specific heat 400 J/(kg·°C). Its temperature rises 16°C with no phase change. Find the energy gained in J.
J
2Motion and energyA mass of 26 kg has velocity -18 m/s. Find its signed momentum in kg·m/s.
kg·m/s
3Waves & soundA periodic wave has frequency 17 Hz and wavelength 21 m. Find its speed in m/s.
m/s
4Waves & soundA repeating signal has frequency 27 Hz. Find its period in seconds as a fraction.
s
5Electricity & circuitsResistors of 10 Ω and 24 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 8 V and 4 A. Find power in W.
W
7Electricity & circuitsAn ideal ohmic resistor of 31 Ω carries 4 A. Find the voltage across it in V.
V
8ChemistryA hypothetical element has isotopes of mass 32 u (60%) and 33 u (40%). Calculate its mean atomic mass in u.
u
9ChemistryAn ideal gas occupies 21 L at 350 K. With pressure and amount fixed, find its volume at 1050 K in L.
L
10ChemistryA sample has mass 12 g and molar mass 12 g/mol. Find its amount in mol.
mol
11Biology & geneticsAn enzyme changes shape at high temperature and its rate falls. Which is a possible explanation?
12Biology & geneticsGenetics and inheritance: which term fits this description? One of the alternative versions of a gene at a particular locus.

From Grade 11

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

13Biology & genetics (Grade 11)An Aa parent can contribute which allele types in this model?
14Motion and energy (Grade 11)A device transfers 195 J in 15 s. Find average power in W.
W
15Chemistry (Grade 11)In a simplified isotope exercise, atomic number Z = 26 and mass number A = 39. How many neutrons?