Consumption of alcohol leads to an increase in dilute urine production by reducing the level of the hormone ADH.Which of the following are correct statements about alcohol and/or ADH?1 ADH…
In the triangle ABC shown below (not to scale): tanA=1/6 and tanB 2/3 M is the midpoint of AB. What is the value of tan θ Answer: 16) C This…
The microwaves generated in a microwave oven travel through air at a speed of 3.0 x 10 8 m/s, with a wavelength of 12cm. They pass through plastic food containers,…
Azurite is a mineral made up of a mixture of CuCO3 and Cu(OH) 2. Which one of the following is a possible formula of azurite? Answer: 14) F By looking…
The diagrams show, not to scale, three different situations in which a force F acts. Also shown in each case is a distance d.Diagram 1:Person sitting on a chairDiagram 2:Wheelbarrow…
Inorganic builders are put into detergents to act as a buffer, i.e. to keep the pH close to 7. Sodium tripolyphosphate is a major one used. The equation for its…
In one type of neurological disease, neurons are unable to detect a certain stimulus which would normally cause pain. In a patient with this disease, which of the following would…
A formula which connects the 'going', G, with the 'rise', R, of stairs in a staircase is below:G = 5 + √7 (9 – R)² + 9Rearrange the formula to…
Students investigate a radioactive source. They place a detector close to a radioactive source and take 5 readings over 5 minutes. They then place a thin sheet of paper between…
The diagram represents the molecule lecithin, a chemical that is added to chocolate drinks to prevent the oils separating out from water. Which row of the table below correctly identifies…