Try the following self-assessment questions. Each statement is either completely correct or completely incorrect, even where there is more than one fact in the statement. When you have decided on your answer, mouse over the answer button to check:

  • A length of one metre is written as 1 m and a length of two metres is written as 2 msThe answer is no
  • The symbol km2 represents an area of one thousand square metres. The answer is no
  • The expression 5 m s-1 is the correct way to write a speed of five metres per second, and 5 m/s in incorrectThe answer is yes
  • A clock frequency for a computer processor of 4 GHz means that the clock runs at four thousand million cycles per second. The answer is yes
  • Weight and mass are the same thing. The answer is no
  • An energy transfer of 1 kW means one thousand joules transferred per second (1 kJ s-1). The answer is yes
  • The Celsius degree, °C, is defined as one hundreth of the difference in temperature between the freezing point and boiling point of water. The answer is yes
  • The freezing point of water is 32°C. The answer is no
  • A force is mass multiplied by acceleration. It has the derived unit of the newton (N), where 1 N = 1 kg m s-2The answer is yes
  • One picometre (pm) is equal to one thousand nanometres (nm). The answer is no
  • There are one thousand kilogrammes in a metric tonne, so 1 tonne = 1 Mg (megagramme).  The answer is yes