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Grade 12 · Science

Grade 12 Science practice

20 questions on waves & sound, electricity & circuits, chemistry, motion & energy. The answer key is a separate download.

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What is on the worksheet

  1. A periodic wave has frequency 4 Hz and wavelength 18 m. Find its speed in m/s.

  2. An ideal ohmic resistor of 74 Ω carries 5 A. Find the voltage across it in V.

  3. An ideal decay model starts with 152 mg. What expected mass remains after 3 half-lives, in mg?

  4. A solution contains 5 mol of solute in a final solution volume of 17 L. Find concentration in mol/L as a fraction or decimal.

  5. A steady DC device operates at 36 V and 8 A. Find power in W.

  6. A steady DC device operates at 43 V and 5 A. Find power in W.

  7. A solution contains 3 mol of solute in a final solution volume of 19 L. Find concentration in mol/L as a fraction or decimal.

  8. A constant current of 10 A flows for 70 s. How much charge passes in C?

  9. A mass of 50 kg has velocity 3 m/s. Find its signed momentum in kg·m/s.

  10. A hypothetical element has isotopes of mass 54 u (80%) and 55 u (20%). Calculate its mean atomic mass in u.

  11. Dilute 280 mL of a 2.7 mol/L solution to 0.9 mol/L without losing solute. Find the final volume in mL.

  12. Resistors of 7 Ω and 50 Ω are connected in parallel. Find the equivalent resistance in Ω as an exact fraction or integer.

  13. A solution contains 33 mol of solute in a final solution volume of 20 L. Find concentration in mol/L as a fraction or decimal.

  14. A solution contains 9 mol of solute in a final solution volume of 18 L. Find concentration in mol/L as a fraction or decimal.

  15. A steady DC device operates at 8 V and 11 A. Find power in W.

  16. Resistors of 41 Ω and 33 Ω are connected in parallel. Find the equivalent resistance in Ω as an exact fraction or integer.

  17. A constant current of 8 A flows for 30 s. How much charge passes in C?

  18. A 1 kg sample has specific heat 400 J/(kg·°C). Its temperature rises 5°C with no phase change. Find the energy gained in J.

  19. A solution contains 30 mol of solute in a final solution volume of 3 L. Find concentration in mol/L as a fraction or decimal.

  20. A sample has mass 611 g and molar mass 47 g/mol. Find its amount in mol.

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