CIDESCO Exam Prep Questions and Answers 100% Pass

CIDESCO Exam Prep Questions and Answers 100% Pass I Biological and non-biological substances both need oxygen for their existence. II The human body consists only of biological substances. - Answer- I is correct and II is incorrect Characteristics of life include: - Answer- growth and metabolism Examples of synthetic substances are: - Answer- plastics and silicones Examples of organic biological substances are: - Answer- carbohydrates and fats Examples of mineral substances are: - Answer- paraffins and petroleum Matter is everything that: - Answer- occupies space and has weight The three forms of matter are solids, liquids and: - Answer- gases What property does all matter have? - Answer- All matter has weight Condensation is the change of matter from: - Answer- a gas to a liquid Vapourisation is the change of matter from: - Answer- liquid to a gas Melting is the change of matter from: - Answer- a solid to a liquid Sublimation is the change of matter from: - Answer- a solid to a gas Condensation is: - Answer- the change of a vapour to a liquid The alteration of the properties of matter without the formation of any new substance is called a/an: - Answer- physical change The immediate change of a solid into a vapour is called: - Answer- sublimation An example of a single-celled cellular organism is: - Answer- a bacterium I. A micro-organism is the smallest part of the human body. II All micro-organisms need nutrients for their existence. - Answer- I is incorrect and II is correct Examples of bacteria are: - Answer- bacilli and cocci I. Every living organism needs some non-biological substances for it's existence. II. All non-biological substances are found as minerals in the earth. - Answer- I is correct and II is incorrect Science deals mainly with: - Answer- physics and chemistry The study of the structure of the body is called: - Answer- anatomy The study of the functions of living organisms is: - Answer- physiology I Anatomy is a very important science in the field of biology. II Anatomy is the science which deals with the functions of the human body. - Answer- I is correct and II is incorrect I Physiology is a very important science in the field of biology. II Physiology is the science which deals with the functions of the body. - Answer- I and II are both correct Which one of the following belongs to the science of chemistry? - Answer- The alteration of the structure of molecules I Chemical reactions only take place outside and not inside a living organism. II The structure of molecules change during chemical reactions. - Answer- I is incorrect and II is correct The field of physics includes: - Answer- heat and electricity Which one of the following belongs to the field of physics? - Answer- Sound, electricity and heat The field of physics includes: - Answer- the science of electricity An anion is: - Answer- A negatively charged atom An anion is: - Answer- a negatively charged chloride atom (CI-) A cation is: - Answer- A positively charged sodium atom (Na+) An electrolyte is: - Answer- A substance which, dissolved in water, splits into ions Examples of electrolytes are: - Answer- acids and salts An example of an electrolyte is: - Answer- salt-solution An acid is an electrolyte because: - Answer- it can conduct an electric current An example of an inorganic acid is: - Answer- sulphuric acid An alkali must contain: - Answer- metal atoms and hydroxyl group(s) (OH) An example of an alkaline substance is: - Answer- soap If a metal-oxide is dissolved in water it forms: - Answer- an alkali The pH scale is used to measure the degree of acidity or: - Answer- alkalinity pH can be decreased by: - Answer- increasing hydrogen-ions The letter p in pH means: - Answer- potential pH is: - Answer- the number of free H-ions in solution If the pH of a solution is between 5 and 7, the solution is a: - Answer- weak acid If the pH of a solution is between 1 and 3 the solution is a: - Answer- strong acid If the pH of a solution is between 7 and 9 the solution is a: - Answer- weak alkali If the pH of a solution is between 12 and 14 the solution is: - Answer- strong alkali The pH of distilled water is: - Answer- 7 Lemon juice, with a pH reading of about 2, is considered to be: - Answer- acid Pure water, with a pH of 7, is considered to be: - Answer- neutral Substances having a pH value above 9.5 are considered to be: - Answer- alkaline The pH of the skin's acid mantle is: - Answer- 5.5 A characteristic of a weak acid is that it: - Answer- supports the natural pH of the skin A characteristic of a weak alkali is that it: - Answer- softens the stratum corneum of the skin The effect of a strong acid is: - Answer- corrosive and therefore of no use in beauty therapy A characteristic of organic acids is that: - Answer- they contain the element carbon (C) Organic acids are found in: - Answer- sebum and plants An organic acid contains the chemical-group: - Answer- COOH An anode is: - Answer- A positively charged electrode A cathode is: - Answer- A negatively charged electrode