PR.4C, SEC 3, Cmpnd unit app 3 (50)
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Question 1 of 50
1. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
⚡ A device has a power of 750 J / s.
It operates for 3 minutes.
Calculate the energy transferred.
-
J⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
-
-
Question 2 of 50
2. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
🚰 Water flows from a tap at 0.18 L / s.
The tap runs for 90 s.
Calculate the volume of water delivered.
-
L⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
-
-
Question 3 of 50
3. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
🔋 An energy density of 60 000 J / m³ is stored in a system.
The total energy stored is 180 000 J.
Calculate the volume of the system in m³.
-
m³⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
-
-
Question 4 of 50
4. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
🔋 A current density of 10 000 A / m² flows through a wire.
The current in the wire is 4 A.
Calculate the cross-sectional area in square metres.
-
m²⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
-
-
Question 5 of 50
5. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
🧪 A solution has a concentration of 2.5 mol / L.
Its volume is 0.60 L.
Calculate the amount of substance in moles.
-
mol⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
-
-
Question 6 of 50
6. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
🔋 A store has an energy density of 60 000 J / m³.
Its volume is 1.25 m³.
Calculate the total energy stored.
-
J⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
-
-
Question 7 of 50
7. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
🌾 A fertiliser contains 30 g of nutrient per kilogram.
A gardener needs 120 g of nutrient.
Calculate the mass of fertiliser required in kilograms.
-
kg⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
-
-
Question 8 of 50
8. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
☢️ A radiation dose rate is 3 mGy / s.
A total dose of 24 mGy is required.
Calculate the exposure time in seconds.
-
s⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
-
-
Question 9 of 50
9. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
🛢️ An oil has a density of 0.9 kg / L.
Its volume is 2.8 L.
Calculate the mass of the oil.
-
kg⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
-
-
Question 10 of 50
10. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
🌱 A fertiliser supplies 25 g of nutrient per kilogram.
A gardener uses 4 kg of fertiliser.
Calculate the mass of nutrient provided.
-
g⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
-
-
Question 11 of 50
11. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
🧲 A particle has a specific charge of 4 C / kg.
The charge on the particle is 20 C.
Calculate the mass of the particle in kilograms.
-
kg⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
-
-
Question 12 of 50
12. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
🧱 A pressure of 3 200 N / m² acts on an area of 0.40 m².
Calculate the force applied.
-
N⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
-
-
Question 13 of 50
13. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
🧲 An ion has a specific charge of 4 C / kg.
Its mass is 2.5 kg.
Calculate the charge it carries.
-
C⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
-
-
Question 14 of 50
14. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
🔋 A current density of 5 000 A / m² flows through a wire.
The current in the wire is 10 A.
Calculate the cross-sectional area of the wire in m².
-
m²⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
-
-
Question 15 of 50
15. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
🔌 An electric field strength is 60 V / m.
The separation of the points is 0.12 m.
Calculate the potential difference.
-
V⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
-
-
Question 16 of 50
16. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
🔊 A loudspeaker produces a sound intensity of 0.5 W / m².
It covers an area of 8 m².
Calculate the sound power emitted.
-
W⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
-
-
Question 17 of 50
17. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
☢️ A dose rate of 2 mGy / s is applied.
The total dose required is 18 mGy.
Calculate the exposure time in seconds.
-
s⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
-
-
Question 18 of 50
18. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
🚰 Water flows at 0.25 L / s from a tap.
The tap runs for 2 minutes.
Calculate the volume of water delivered.
-
L⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
-
-
Question 19 of 50
19. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
💡 An area is illuminated to 300 lx.
The illuminated area is 12 m².
Calculate the luminous flux in lumens.
-
lm⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
-
-
Question 20 of 50
20. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
🌡️ A metal has a specific heat capacity of 800 J / (kg °C).
It absorbs 24 000 J of heat, causing a temperature rise of 20 °C.
Calculate the mass of the metal in kilograms.
-
kg⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
-
-
Question 21 of 50
21. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
⚗️ Water has a molar mass of 0.018 kg / mol.
A sample contains 5 mol of water.
Calculate the mass of the sample.
-
kg⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
-
-
Question 22 of 50
22. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
☢️ A radiation dose rate is 1.5 mGy / s.
Exposure lasts for 8 s.
Calculate the total dose received.
-
mGy⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
-
-
Question 23 of 50
23. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
🔊 A sound intensity of 2 W / m² is measured.
The total sound power emitted is 5 W.
Calculate the area over which the sound spreads in m².
-
m²⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
-
-
Question 24 of 50
24. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
🔋 A storage system has an energy density of 50 000 J / m³.
Its volume is 0.80 m³.
Calculate the total energy stored.
-
J⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
-
-
Question 25 of 50
25. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
⚗️ A chemical has a molar mass of 0.056 kg / mol.
A sample contains 2.5 mol.
Calculate its mass.
-
kg⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
-
-
Question 26 of 50
26. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
🚗 A car’s fuel efficiency is 15 km / L.
The journey distance is 225 km.
Calculate the volume of fuel used in litres.
-
L⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
-
-
Question 27 of 50
27. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
🌾 Fertiliser contains 35 g of nutrient per kilogram of product.
A gardener uses 3.5 kg of fertiliser.
Calculate the mass of nutrient supplied.
-
g⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
-
-
Question 28 of 50
28. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
🖥️ A computer transfers data at 15 MB / s.
It runs a backup for 4 minutes.
Calculate the total data transferred.
-
MB⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
-
-
Question 29 of 50
29. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
🛢️ An oil has a density of 0.85 kg / L.
Its mass is 3.4 kg.
Calculate the volume of the oil in litres.
-
L⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
-
-
Question 30 of 50
30. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
🔋 A current density of 20 000 A / m² flows through a wire of cross-sectional area 5 cm².
Calculate the current in amperes.
-
A⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
-
-
Question 31 of 50
31. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
⚡ A device has a power of 500 J / s.
During operation it transfers 150 000 J of energy.
Calculate the time taken in seconds.
-
s⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
-
-
Question 32 of 50
32. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
⚡ A heater has a power rating of 1 200 J / s.
It transfers 540 000 J of energy.
Calculate the time taken in seconds.
-
s⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
-
-
Question 33 of 50
33. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
⚡ A gadget operates with a power of 500 J / s.
It runs for 4 minutes.
Calculate the energy transferred.
-
J⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
-
-
Question 34 of 50
34. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
🧪 A solution has a concentration of 2 mol / L.
It contains 5 mol of solute.
Calculate the volume of the solution in litres.
-
L⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
-
-
Question 35 of 50
35. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
🧱 A pressure of 2 500 N / m² acts on a surface.
The force on the surface is 7 500 N.
Calculate the area in square metres.
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m²⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
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Question 36 of 50
36. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
🧪 A solution has a concentration of 4 mol / L.
Its volume is 0.75 L.
Calculate the amount of substance.
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mol⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
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Question 37 of 50
37. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
🛢️ An oil has a density of 1.1 kg / L.
Its mass is 3.3 kg.
Calculate the volume of the oil in litres.
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L⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
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Question 38 of 50
38. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
🔋 An energy density of 70 000 J / m³ is stored in a system.
The total energy stored is 280 000 J.
Calculate the volume of the system in cubic metres.
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m³⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
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Question 39 of 50
39. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
🛢️ An oil has a density of 1.2 kg / L.
Its volume is 3.5 L.
Calculate the mass of the oil.
-
kg⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
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Question 40 of 50
40. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
🧱 A pressure of 4 000 N / m² acts on a surface.
The force on the surface is 2 000 N.
Calculate the area of the surface in m².
-
m²⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
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Question 41 of 50
41. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
🌡️ A metal has a specific heat capacity of 900 J / (kg °C).
It absorbs 18 000 J of heat, raising its temperature by 20 °C.
Calculate the mass of the metal in kilograms.
-
kg⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
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Question 42 of 50
42. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
🪢 A rope has a linear density of 0.20 kg / m.
Its length is 18 m.
Calculate the mass of the rope.
-
kg⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
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Question 43 of 50
43. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
🔌 An electric field strength is 50 V / m.
The potential difference between two points is 12.5 V.
Calculate the separation of the points in metres.
-
m⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
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Question 44 of 50
44. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
🚰 Water flows from a tap at 0.15 L / s.
A container is filled with 27 L of water.
Calculate the filling time in seconds.
-
s⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
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Question 45 of 50
45. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
🧱 A pressure of 2 500 N / m² acts on an area of 0.80 m².
Calculate the force exerted.
-
N⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
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Question 46 of 50
46. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
🚰 Water flows from a tap at 0.20 L / s.
A bucket is filled with 48 L of water.
Calculate the filling time in seconds.
-
s⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
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Question 47 of 50
47. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
🧲 A particle has a specific charge of 2.5 C / kg.
Its charge is 12.5 C.
Calculate the mass of the particle in kilograms.
-
kg⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
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Question 48 of 50
48. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
🔌 An electric field strength is 45 V / m.
The separation of the points is 0.20 m.
Calculate the potential difference.
-
V⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
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Question 49 of 50
49. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
⚗️ Water has a molar mass of 0.018 kg / mol.
A sample has a mass of 0.09 kg.
Calculate the amount of substance in moles.
-
mol⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
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Question 50 of 50
50. Question
Topic: General Compound units.
Please have pen and paper handy to show workings out. 📝
🌾 A fertiliser contains 28 g of nutrient per kilogram.
A crop needs 140 g of nutrient.
Calculate the mass of fertiliser required in kilograms.
-
kg⌨️ Enter your answer in the fields provided.
CorrectIncorrectHint
💡 Quick compound-units tip.
Write both units across the top, like seconds and joules.
Convert any units so they match first, for example minutes to seconds.
Draw a two-row ratio table so matching units sit in neat columns.
Put the known pair on the first row and a question mark for the unknown on the second.
Find the scale factor by dividing the bottom by the top number in one column.
Multiply every number in the other column by that scale factor, then check the units on your answer.
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