CIDESCO Exam Prep Questions with correct Answers 2023

CIDESCO Exam Prep Questions with correct Answers 2023 I Biological and non-biological substances both need oxygen for their existence. II The human body consists only of biological substances. I is correct and II is incorrect Characteristics of life include: growth and metabolism Examples of synthetic substances are: plastics and silicones Examples of organic biological substances are: carbohydrates and fats Examples of mineral substances are: paraffins and petroleum Matter is everything that: occupies space and has weight The three forms of matter are solids, liquids and: gases What property does all matter have? All matter has weight Condensation is the change of matter from: a gas to a liquid Vapourisation is the change of matter from: liquid to a gas Melting is the change of matter from: a solid to a liquid Sublimation is the change of matter from: a solid to a gas Condensation is: 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: physical change The immediate change of a solid into a vapour is called: sublimation An example of a single-celled cellular organism is: a bacterium I. A micro-organism is the smallest part of the human body. II All micro-organisms need nutrients for their existence. I is incorrect and II is correct Examples of bacteria are: 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. I is correct and II is incorrect Science deals mainly with: physics and chemistry The study of the structure of the body is called: anatomy The study of the functions of living organisms is: 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. 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. I and II are both correct Which one of the following belongs to the science of chemistry? 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. I is incorrect and II is correct The field of physics includes: heat and electricity Which one of the following belongs to the field of physics? Sound, electricity and heat The field of physics includes: the science of electricity An anion is: A negatively charged atom An anion is: a negatively charged chloride atom (CI-) A cation is: A positively charged sodium atom (Na+) An electrolyte is: A substance which, dissolved in water, splits into ions Examples of electrolytes are: acids and salts An example of an electrolyte is: salt-solution An acid is an electrolyte because: it can conduct an electric current An example of an inorganic acid is: sulphuric acid An alkali must contain: metal atoms and hydroxyl group(s) (OH) An example of an alkaline substance is: soap If a metal-oxide is dissolved in water it forms: an alkali The pH scale is used to measure the degree of acidity or: alkalinity pH can be decreased by: increasing hydrogen-ions The letter p in pH means: potential pH is: the number of free H-ions in solution If the pH of a solution is between 5 and 7, the solution is a: weak acid If the pH of a solution is between 1 and 3 the solution is a: strong acid If the pH of a solution is between 7 and 9 the solution is a: weak alkali If the pH of a solution is between 12 and 14 the solution is: strong alkali The pH of distilled water is: 7 Lemon juice, with a pH reading of about 2, is considered to be: acid Pure water, with a pH of 7, is considered to be: neutral Substances having a pH value above 9.5 are considered to be: alkaline The pH of the skin's acid mantle is: 5.5