A circle has a diameter of 20cm. The line AC is a diameter of the circle. B is a point on the circumference of the circle with AB = 12cm.…

Which of the following thermal decomposition reactions will require the highest temperature? Answer: 26) D This requires to remember the reactivity series off by heart as such question do often…

A heart exerts a maximum (systolic) pressure of 152mm Hg. This pressure is applied to an aorta of cross sectional area 2.0cm2 What force must be generated by the heart…

During the fetal stage an opening, the foramen ovale, exists in the septum between the two atria. This allows blood to flow from the right atrium to the left atrium.The…

A sample of butane, C4H10 is treated with deuterium, D (an isotope of hydrogen) and some of the hydrogen atoms are replaced by deuterium atoms. Analysis shows that the substituted…

When a 1kg mass is dropped from the top of a building 20m high it hits the Earth with a speed of 20m/s. What would be its speed if the…

In the shape shown below, A, B and C are the vertices of an equilateral triangle, side length xcm. The arc AC forms a semicircle. Which of the following alternatives…

The table shows the concentrations, in arbitrary units, of four substances. These substances are present in each of two animal cells, K and L, whose cell membranes are in contact.…

A sample of an acid, H2X, weighing 4.5g was dissolved in water. This solution was neutralised by 50.0cm3 of aqueous sodium hydroxide containing 2mol/dm3. What is the relative molecular mass,…

A sample of rock contains 235U and 207Pb in the proportion one part 235U to seven parts 207Pb. It is known that 235U decays to 207Pb with a half life…