The NNPC/Chevron Scholarship is awarded by Chevron Nigeria Limited in Partnership with the Nigerian National Petroleum Corporation (NNPC) to second year students. The scholarship worth is N100,000 till graduation. Its a yearly offer and more information can be found here....
This pack contains useful questions and exercises that will aid your preparation for the NNPC/Chevron selection test.
The Chevron Aptitude test pre pack is made up of the following sections:
Groundwater is usually free of contaminants and does not requirefiltration, but it often contains iron and other minerals that must be removed to ‘soften’ the water. Hard water contains ions called calcium and magnesiumwhich renders it unsuitable for many purposes. When soap is used with hardwater, it is precipitated by these ions to form scum, so that more soap isrequired to produce lather.
Hard water is also undesirable in hot-water systems because it depositscalcium carbonate and calcium sulphate inside pipes and boilers. This is knownas limescale. Ion-exchange is sometimes used to soften water. This involveszeolites or ion exchange resins which release positive ions and take up, inexchange, the calcium and magnesium ions of hard water. Another method ofsoftening water is precipitation, where chemicals added to hard water combineswith the calcium and magnesium ions to form insoluble precipitates that areeasily removed.
(1). Which two of these statements must be true?
A. The interaction of chemicals plays an important role in some methodsof water softening.
B. The precipitates created by the addition of chemicals can be easilyremoved to leave behind softened water.
C. The process of water softening is speeded up by combining calciumand magnesium ions with other chemicals
D. The chemicals in hard water are dissolved during the process ofprecipitation
(2). Which two of these statements must be true?
A. Calcium and magnesium ions precipitate soap to produce scum
B. The ion content of hard water is increased by the soap
C. The production of lather is influenced by the ion level of hardwater
D. Greater volumes of hard water than soft water are required in orderto produce lather
(3). If a trader bought yesterday 15 troy ounces of gold and 20 troyounces of palladium, how much has the value of these precious metals changed?
A. None of these
B. Up $100
C. Down $100
D. Up $165
E. Up $65
(4). What is the price difference between 50 troy ounces of goldcompared to platinum?
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