The following five statements relate to homeostasis (the maintenance of stable internal conditions of the body):1 Insulin helps to control the water content of the body.2 Homeostasis depends only on…

The equation gives y in terms of x. y = 5 (ˣ⁄₂ – 3 )² -10 Rearrange the equation to give an expression for x in terms of y Answer: 24)…

A train consists of a powered engine pulling two unpowered carriages. The engine has a mass of 20000kg, and each carriage has a mass of 5000kg. When the engine accelerates…

At room temperature, a reaction is very fast if no bonds are broken while it takes place, and is slow if bonds have to be broken.1 H2 + I2 →…

The diagram shows a section through an alveolus. Gases diffuse through the alveolar andcapillary walls. Which row explains why gaseous exchange occurs in the alveolus? Answer: 21) D We know…

A solid sphere of radius r fits inside a hollow cylinder. The cylinder has the same internal diameter and length as the diameter of the sphere. The volume of a…

An object of mass 5kg falls from rest and hits the ground at a speed of 20m/s. Air resistance isnegligible.From what height has the object fallen? Answer: 19) B From…