EJU Science case studies
EJU Science · Put your knowledge to work in context.
The Examination for Japanese University Admission for International Students (EJU) is administered by JASSO, the Japan Student Services Organization, and is used by Japanese universities and other schools when they admit international students. Science is one of the subjects listed alongside Japanese as a Foreign Language, Japan and the World, and Mathematics. The EJU Science case studies are 5 cases and about 3,785 words.
1Spring constant: static extension vs oscillation timing
A student determines the spring constant k of a light helical spring by two methods. Method A: the spring hangs vertically, a 200 g mass is hung from it, and the extension is read with a millimetre ruler as 4.9 cm.
740 words, about 4 min2Battery internal resistance and a filament lamp load
A student investigates a battery using a variable resistor, an ammeter and a voltmeter connected so that V is the terminal voltage. At two settings the readings are (I = 0.10 A, V = 2.90 V) and (I = 0.50 A, V = 2.50 V).
760 words, about 4 min3Weak-acid titration: indicator choice and a wet burette
Two students each titrate 25.0 cm³ portions of the same weak monoprotic acid HA with 0.100 mol/L NaOH. Student 1 obtains three concordant titres and reports a mean of 22.40 cm³, using phenolphthalein.
723 words, about 4 min4Copper electrolysis: Faraday's law and where the missing mass went
Two clean copper plates, each of mass 5.000 g, are weighed and connected as the two electrodes in 0.50 mol/L CuSO₄(aq). A steady current of 0.500 A is passed for 30.0 min; the current is monitored throughout and stays constant.
752 words, about 4 min5Catalase activity: pH optimum, a suspect replicate, and copper inhibition
A student grinds 20 g of potato in buffer to make an extract and measures catalase activity. In each trial 5.0 cm³ of extract is added to 20 cm³ of 2.0 % H₂O₂ at 20 °C, and the volume of O₂ collected in the first 60 s is recorded.
810 words, about 4 min