Junior Cycle (Ireland) · Science

Calculations

80 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 80 questions

  1. A 1000 W heater is on for 2 hours. Electricity costs 30 cent per kWh. What is the cost?
  2. A 3000 W heater is on for 3 hours. Electricity costs 30 cent per kWh. What is the cost?
  3. A metal object of mass 156 g is lowered into a measuring cylinder containing 300 cm of water. The water level rises to 360 cm. What is the density of the metal?
  4. A 1000 W heater is on for 4 hours. Electricity costs 25 cent per kWh. What is the cost?
  5. A metal object of mass 195 g is lowered into a measuring cylinder containing 250 cm of water. The water level rises to 275 cm. What is the density of the metal?
  6. How many moles are there in 32 g of methane, CH? (Relative formula mass = 16)
  7. A motor takes in 500 J of energy and gives out 375 J of useful energy. What is its efficiency?
  8. A force of 120 N moves a box 5 m in the direction of the force. How much work is done?
  9. A 3000 W heater is on for 2 hours. Electricity costs 25 cent per kWh. What is the cost?
  10. A machine transfers 4500 J of energy in 10 s. What is its power?
  11. A train travels 150 km in 2 hours at a steady speed. What is its speed?
  12. A 3000 W heater is on for 2 hours. Electricity costs 30 cent per kWh. What is the cost?
  13. A current of 0.5 A flows through a resistor of 6 ohms. What is the potential difference across the resistor?
  14. A current of 0.5 A flows through a resistor of 4 ohms. What is the potential difference across the resistor?
  15. A train travels 120 km in 6 hours at a steady speed. What is its speed?
  16. How many moles are there in 36 g of water, HO? (Relative formula mass = 18)
  17. A 5 kg trolley is pulled forward by a force of 50 N while friction of 20 N acts against it. What is its acceleration?
  18. A force of 50 N moves a box 10 m in the direction of the force. How much work is done?
  19. How many moles are there in 9 g of water, HO? (Relative formula mass = 18)
  20. A block has a mass of 800 g and a volume of 50 cm. What is its density in g/cm?
  21. A train travels 240 km in 5 hours at a steady speed. What is its speed?
  22. A force of 40 N moves a box 2 m in the direction of the force. How much work is done?
  23. A 10 kg trolley is pulled forward by a force of 40 N while friction of 10 N acts against it. What is its acceleration?
  24. A 1000 W heater is on for 3 hours. Electricity costs 25 cent per kWh. What is the cost?
  25. How many moles are there in 176 g of carbon dioxide, CO? (Relative formula mass = 44)
  26. A train travels 240 km in 3 hours at a steady speed. What is its speed?
  27. A force of 250 N moves a box 3 m in the direction of the force. How much work is done?
  28. A force of 20 N moves a box 3 m in the direction of the force. How much work is done?
  29. A metal object of mass 156 g is lowered into a measuring cylinder containing 250 cm of water. The water level rises to 310 cm. What is the density of the metal?
  30. A force of 900 N acts on an area of 2 m. What is the pressure?
  31. A metal object of mass 156 g is lowered into a measuring cylinder containing 250 cm of water. The water level rises to 280 cm. What is the density of the metal?
  32. A train travels 450 km in 2 hours at a steady speed. What is its speed?
  33. A 3000 W heater is on for 4 hours. Electricity costs 30 cent per kWh. What is the cost?
  34. A force of 600 N acts on an area of 2 m. What is the pressure?
  35. A 10 kg trolley is pulled forward by a force of 50 N while friction of 10 N acts against it. What is its acceleration?
  36. A current of 3 A flows through a resistor of 6 ohms. What is the potential difference across the resistor?
  37. A block has a mass of 200 g and a volume of 100 cm. What is its density in g/cm?
  38. A 3000 W heater is on for 3 hours. Electricity costs 25 cent per kWh. What is the cost?
  39. How many moles are there in 117 g of sodium chloride, NaCl? (Relative formula mass = 58.5)
  40. A 2000 W heater is on for 4 hours. Electricity costs 25 cent per kWh. What is the cost?
  41. A 10 kg trolley is pulled forward by a force of 30 N while friction of 10 N acts against it. What is its acceleration?
  42. A 5 kg trolley is pulled forward by a force of 60 N while friction of 15 N acts against it. What is its acceleration?
  43. A 2 kg trolley is pulled forward by a force of 30 N while friction of 20 N acts against it. What is its acceleration?
  44. A metal object of mass 156 g is lowered into a measuring cylinder containing 250 cm of water. The water level rises to 270 cm. What is the density of the metal?
  45. A 2000 W heater is on for 2 hours. Electricity costs 25 cent per kWh. What is the cost?
  46. A block has a mass of 600 g and a volume of 100 cm. What is its density in g/cm?
  47. A 2000 W heater is on for 3 hours. Electricity costs 20 cent per kWh. What is the cost?
  48. A 10 kg trolley is pulled forward by a force of 60 N while friction of 10 N acts against it. What is its acceleration?
  49. A motor takes in 400 J of energy and gives out 240 J of useful energy. What is its efficiency?
  50. A current of 4 A flows through a resistor of 20 ohms. What is the potential difference across the resistor?
  51. A machine transfers 1200 J of energy in 20 s. What is its power?
  52. How many moles are there in 234 g of sodium chloride, NaCl? (Relative formula mass = 58.5)
  53. A train travels 300 km in 2 hours at a steady speed. What is its speed?
  54. A train travels 120 km in 3 hours at a steady speed. What is its speed?
  55. A 5 kg trolley is pulled forward by a force of 50 N while friction of 10 N acts against it. What is its acceleration?
  56. A machine transfers 4500 J of energy in 20 s. What is its power?
  57. A metal object of mass 156 g is lowered into a measuring cylinder containing 250 cm of water. The water level rises to 265 cm. What is the density of the metal?
  58. A 10 kg trolley is pulled forward by a force of 60 N while friction of 20 N acts against it. What is its acceleration?
  59. A 1000 W heater is on for 2 hours. Electricity costs 20 cent per kWh. What is the cost?
  60. A metal object of mass 195 g is lowered into a measuring cylinder containing 250 cm of water. The water level rises to 265 cm. What is the density of the metal?
  61. How many moles are there in 88 g of carbon dioxide, CO? (Relative formula mass = 44)
  62. How many moles are there in 48 g of methane, CH? (Relative formula mass = 16)
  63. A 1000 W heater is on for 4 hours. Electricity costs 30 cent per kWh. What is the cost?
  64. A force of 600 N acts on an area of 4 m. What is the pressure?
  65. A motor takes in 200 J of energy and gives out 50 J of useful energy. What is its efficiency?
  66. A train travels 150 km in 3 hours at a steady speed. What is its speed?
  67. A motor takes in 800 J of energy and gives out 320 J of useful energy. What is its efficiency?
  68. A current of 0.5 A flows through a resistor of 10 ohms. What is the potential difference across the resistor?
  69. A motor takes in 800 J of energy and gives out 480 J of useful energy. What is its efficiency?
  70. A machine transfers 1200 J of energy in 60 s. What is its power?
  71. A metal object of mass 234 g is lowered into a measuring cylinder containing 250 cm of water. The water level rises to 280 cm. What is the density of the metal?
  72. A machine transfers 4500 J of energy in 60 s. What is its power?
  73. A 4 kg trolley is pulled forward by a force of 60 N while friction of 20 N acts against it. What is its acceleration?
  74. A force of 20 N moves a box 10 m in the direction of the force. How much work is done?
  75. A metal object of mass 156 g is lowered into a measuring cylinder containing 300 cm of water. The water level rises to 340 cm. What is the density of the metal?
  76. A block has a mass of 200 g and a volume of 50 cm. What is its density in g/cm?
  77. A 3000 W heater is on for 4 hours. Electricity costs 25 cent per kWh. What is the cost?
  78. A machine transfers 3000 J of energy in 30 s. What is its power?
  79. A train travels 450 km in 6 hours at a steady speed. What is its speed?
  80. A 4 kg trolley is pulled forward by a force of 40 N while friction of 20 N acts against it. What is its acceleration?

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