Hong Kong Primary 5 General Studies Practice Paper 2 with Answers | 10 questions, 50 minutes

When my mother buys fruit juice she reads the nutrition label first. One line is called “sugar” and it is usually given for every 100 mL.
I worked it out with a calculator: if there are 8 g of sugar in 100 mL, one 250 mL box holds 20 g. In other words, one box equals 4 sugar cubes (a cube is about 5 g).
The Department of Health advises adults to take less than 50 g of sugar a day. So one box like this is already 40 per cent of the daily limit.
My mother says it is not that you cannot drink it; you just need to know how much you have had and take less sugar in other food.

Our estate produces about 60 tonnes of rubbish a month. About 18 tonnes go into the three coloured bins and the rest goes to the landfill.
The management office put “recycling rate 30 per cent” on the notice board and explained the method: the weight recycled divided by the total weight of rubbish, times one hundred per cent.
That means 42 tonnes still have to be buried in the landfill.
The cleaner says the most common mistake is the takeaway box: many people throw the whole box, food scraps and all, into the paper bin, so the whole bin of paper is soiled and can only be treated as rubbish.
She suggests emptying the scraps into the food waste bin, rinsing the box, flattening it and putting it in the right bin.

I opened a broken torch with a screwdriver. There were two cells inside, 1.5 volts each.
My father says the cells are joined one after another, so the voltages add up: two cells of 1.5 volts give 3 volts in total. The bulb is printed with “3 V”, which matches exactly.
If you put a cell in the wrong way round, the positive and negative ends are reversed, the circuit is not complete and the bulb will not light.
A circuit needs three parts: a source (the cells), conductors (the wires and the metal spring) and a device (the bulb). If any part is broken, the current stops.
So when a torch does not light, first check whether the cells are flat, then whether the metal spring is rusty or the cells are in the wrong way.