CIDESCO Practice Questions V2 with Complete Solutions Graded A 2024

Which statements are correct? 1. Every living organism needs some non-biological substances for its existence. 2. All non-biological substances are found as minerals in the earth. - 1 and 2 are incorrect Characteristics of life include? - Growth and Metabolism Examples of organic biological substances are? - Carbohydrates and Fats Examples of minerals substances are? - Paraffins and Petroleum Matter is everything that? - Occupies space and has weight Condensation is the change of matter from? - A gas to a liquid Vaporization is the change of matter from? - A 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 An example of a single-celled cellular organism is? - A bacterium Which are correct? 1. A micro-organism is the smallest part of the human body. 2. All micro-organisms need nutrients for their existence - 1 is incorrect, 2 is correct Science deals mainly with? - Physics and chemistry The study of the functions of living organisms is? - Physiology Which are correct? 1. Anatomy is a very important science in the field of biology. 2. Anatomy is the science which deals with the functions of the human body. - 1. is correct 2. is incorrect Which are correct? 1. Physiology is very important science in the field of biology. 2. Physiology is the science which deals with the functions of the body - 1 and 2 are correct Which one of the following belongs to the science of chemistry? - The alteration of the structure of molecules Which are correct? 1. Chemical reactions only take place outside and not inside a living organism. 2. The structure of molecules change during chemical reactions. - 1. is incorrect 2. is correct The field of physics includes? - heat and electricity An anion is a? - Negatively charged atom A cation is a? - Positively charged sodium atom (Na+) An electrolyte is a? - salt-solution An acid is an electrolyte because? - it can conduct an electric current pH can be decreased by? - increasing hydrogen-ions pH is? - the number of free h-ions in a 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 7 and 9, the solution is a? - Weak Alkali The pH of distilled water is? - 7 Lemon juice, with a pH reading of about 2, is considered to be? - Acidic Substances having a pH value above 9.5 are considered to be? - Alkaline The pH of the skin's acid mantle is? - 5.5 A characteristic of a weak acid is that it? - Supports the natural pH of the skin A characteristic of organic acids is that? - They contain the element carbon (C) An organic acid contains the chemical group? - C00H An anode is a? - Positively charged electrode A cathode is a? - Negatively charged electrode Examples of electrodes which are used in beauty therapy are? - The needles used for galvanic electrolysis In physics, radiation means? - The electro-magnetic waves in space In physics, frequency means? - The number of times per second an electro-magnetic-wave can change direction Hertz, is a unit of? - Frequency In the visible spectrum the colours in the correct order are? - Green, blue, indigo, and violet Invisible rays which can be used in beauty therapy are? - Infra-red and ultra-violet rays Infra-red radiations? - Invisible and can be felt Infra-red rays can be used in beauty therapy for? - Warming The effect of infra-red rays on the skin is to? - Warm the deeper layers of the skin An indication for a treatment with infra-red rays is? - Poor blood circulation in the skin