BJC General Science case studies
BJC General Science · Put your knowledge to work in context.
The BJC General Science examination is a junior secondary school leaving qualification in The Bahamas, typically taken by students near the end of the lower secondary cycle. It certifies a broad foundation in science rather than specialised knowledge, and it serves students who intend to continue to senior secondary science, those moving into technical or vocational pathways, and school leavers who need a recognised science credential. The BJC General Science case studies are 5 cases and about 3,350 words.
1The Drying Time Trial
A student investigates whether adding table salt speeds up the evaporation of water. She places 50 mL of tap water in each of four identical shallow dishes.
697 words, about 3 min2Choosing a Measuring Instrument for a Density Practical
A class must determine the density of an irregular small stone and of a clear liquid. Available equipment: a 100 mL measuring cylinder with 2 mL graduations, a 10 mL measuring cylinder with 0.2 mL graduations, a top-pan balance reading to 0.01 g, a 50 mL beaker, and a ruler.
656 words, about 3 min3Separating a Three-Component Mixture
A student is given a beaker containing a mixture of sand, table salt, and small iron filings, plus a little water. The mixture is stirred and looks cloudy.
676 words, about 3 min4Interpreting a Diet and Energy Balance Case
A 14-year-old student reports feeling tired during afternoon lessons and has been skipping breakfast. A typical school-day intake is: no breakfast; a packet of crisps and a sugary drink at break; a white-bread sandwich with cheese at lunch; and a large evening meal of rice, chicken, and vegetables.
648 words, about 3 min5Testing a Claim About a Magnetic 'Free Energy' Device
A website advertises a small device containing magnets that, it claims, can light a lamp 'forever without any power source'. A student builds a similar device using two bar magnets, a coil of wire, and a small lamp.
673 words, about 3 min