This week's Friday Brain-teaser from xrefer tests your knowledge of conversions. Answers here:

1. How many millimetres are there in a metre?
2. Is a hectare equivalent to about 1.5, 2.5 or 3.5 acres?
3. Nought (0) degrees centigrade is equivalent to how many degrees fahrenheit?
4. How many ounces are there in one pound?
5. How many pints are there in a litre: about 1.25, 1.5 or 1.75?
6. How many millimetres are there in a kilometre?
7. Is a speed of 50 kilometres an hour the same as about 11, 21 or 31 miles per hour?
8. Are 900 kilograms more or less than one ton (imperial or US)?
9. For fuel consumption, is 10 miles per litre equivalent to about 16, 26 or 36 kilometres per litre?
10. As a measure of energy, 134.1022 horsepower is equal to how many kilowatts?