CIDESCO Exam Prep 100% VERIFIED SOLUTIONS 2023//2024

CIDESCO Exam Prep 100% VERIFIED SOLUTIONS 2023//2024 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