The sides of triangle ABC are as follows: AB = 3, AC = 2, BC = 4. Use the cosine rule, a^2=b^2+c^2-2bc cosA , to find the cosine of ∠BAC…

Listed are the electronic configurations for the atoms of different elements. Which one represents the most reactive non-metal? Answer: 5) C As you go along a period, reactivity of non-metal…

The amount of water in urine is controlled by the hormone ADH. Which sequence of events will occur when you need to keep water in your body? Answer: 4) B…

A particular radioisotope X with a half-life of 4 years decays into the stable isotope Y. At a particular time, a sample contains 32 x 10²º atoms of nuclide X…

Compound T has a melting point of 78 °C and a boiling point of 134 °C. T is soluble in water and its solution does not conduct electricity. T has…

The graph shows changes in the mass of glycogen stored in the liver and skeletal muscles. During which periods will the concentration of insulin in the blood be below normal?…

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…