The depth of water in a particular tidal harbour varies with time as shown in the graph: If the variation in depth caused by the effect of the tide is…

Carbon, in the form of coke, is used to reduce iron oxide in a blast furnace. The three stages are shown below:1 C + O2 → CO22 CO2 + C…

The following statements are about hormone levels and their effect:1 Increasing levels of insulin cause an increase in blood glucose levels.2 Increasing levels of oestrogen increases the thickness of the…

I have two containers with different capacities. Initially, the larger one is full of water and the smaller one is empty. I pour water from the larger container into the…

In a laboratory experiment, protactinium-234 undergoes radioactive decay by β-emission into uranium-234. The table below describes how the mass of uranium-234 present in the sample varies with time from the…

A compound of iodine and oxygen contains 63.5g of iodine and 20.0g of oxygen. Which of the following would be its formula? Answer: 2) E We need to use the…

Which row of the table correctly describes what happens when body temperature rises in a human? Answer: 1) E Homeostatsis (temperature, water level in body etc.) is related to the…