Prelim Standard 2 Units of Measurement 2

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The table shows the average energy used, in kilojoules per kilogram of body mass, by a person walking for 30 minutes at two different speeds. Jim weighs 70 kg and regularly drinks a hot chocolate made with full cream milk. It contains 83 kilocalories. For approximately how long must Jim walk at 5km/h to burn off the energy contained in the hot chocolate? (1 kilocalorie = 4.184 kJ)

1 point

20 minutes

25 minutes

45 minutes

120 minutes

Clear selection

Betty weighs 55.5 kg (measured to the nearest 0.1 kg). The percentage error for this measurement is:

1 point

0.5%

0.45%

0.18%

0.09%

Clear selection

There are 1 056 006 tiles on the Sydney Opera House. When this number is written in scientific notation to two decimal places, it is equivalent to which of the following?

1 point

1.056 x 10⁶

1.06 x 10⁶

1.05 x 10⁶

1.06

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The water usage charge for non-residential property is $1.80/kL for the first 250 kL and $2.20/kL for any consumption over 250 kL.What is the cost if the amount of water consumed is 480 kL?

1 point

$864

$956

$1056

$1506

Clear selection

A 120 watt ceiling fan is run for 24 hours each day. If electricity is charged at 24.8 c/kWh, what is the cost of running the ceiling fan for 30 days, to the nearest cent?

1 point

$15.68

$21.43

$86.40

$2142.73

Clear selection

The height of a door is measured to be 2.1 metres, correct to the nearest 10 centimetre. What is the absolute error of this measurement?

1 point

± 0.01 m

± 0.1 m

± 0.5 m

± 0.05 m

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