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JSS2: BASIC SCIENCE - 1ST TERM

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  1. Living Things (Habitat) | Week 1, 2 & 3
    8 Topics
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    1 Quiz
  2. Living Things (Uniqueness of Man) | Week 4
    9 Topics
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    1 Quiz
  3. Growth and Development | Week 5 & 6
    4 Topics
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    1 Quiz
  4. Chemicals | Week 7 & 8
    4 Topics
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    1 Quiz
  5. Work, Energy & Power | Week 9
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    1 Quiz



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Units of length: The basic unit of length measurements in metric units is a metre (m).

1 millimetre (mm) = \( \frac{1}{1000m} \scriptsize = 10^{-3}m\)

1 centimetre (cm)  = \( \frac{1}{100m}\scriptsize = 10^{-2}m\)

1 decimetre (dm)   =   \( \frac{1}{10}\scriptsize = 10^{-1}m\)

1 decametre (Dm)  = 10m = 101m

1 hectometre (Hm) = 100m = 102m

1 kilometre (Km)  = 1,000m = 103m

Length Measuring Tools:

1. Scale rulers: A ruler is either made of steel, plastic, or wood and is normally graduated in centimetres (cm). Each centimetre(cm) is sub-divided into ten divisions to give 0.1cm or each division of 1mm. Standard lengths of rulers are normally 30cm, 500cm, or 1.0m.

Triangular-Scale-Ruler
Triangular Scale Rule.

2. Measuring Tapes: Measuring tapes are usually used for measuring longer distances by tailors, bricklayers, carpenters, surveyors, etc. Measuring tapes are made of steel or cloth, graduated in centimetres, with or without sub-divisions in millimetres.

The length of the tapes varies and they include 60cm (tailor’s measuring tape), 300cm (carpenter’s measuring tape), and 5m to 50m (bricklayer’s measuring tape). The graduated tapes are usually housed in steel or plastic cases when not in use.

stainless steel Tape Measure
Stainless steel Tape Measure.

Measurements of Volume:

Units of volume: The basic unit of volume is litre (L). The cubic centimetre (c.c or cm3) and millimetre (ml) are also commonly used.

1 millimetre (ml) = 1c.c

1 centilitre (cl) = \( \frac{1}{10^2}\) litre = 10ml 

1 litre (L) = 1000ml = 1000cc

Conversion units are: 

1cm3  =  1c.c  =  1ml  =  10mm x 10mm x 10mm = 103mm3

1m3      =  100cm  x  100cm  x  100cm  =  106cm3

1m3    =  10dm  x  10dm  x  10dm  =  103dm3

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