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...
CIDESCO Exam Prep
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
Examples of electrodes which are used in beauty therapy are: - Answer- the needles used for galvanic electrolysis
In physics, radiation means: - Answer- the electro-magnectic waves in space system
The unit of frequency is: - Answer- Hertz
In physics, frequency means: - Answer- the number of times per second an electro-
magnetic-wave can change direction
The unit of frequency is: - Answer- Hertz
Hertz is a unit of: - Answer- frequency
In the visible spectrum the colours in the correct order are: - Answer- red, orange, yellow and green
In the visible spectrum the colours in the correct order are: - Answer- green, blue, indigo
and violet
Invisible rays which can be used in beauty therapy are: - Answer- infra-red and ultra-
violet rays
Infra-red radiation: - Answer- is invisible and can be felt
Infra-red radiation is absorbed: - Answer- in the dermis and muscles
Infra-red rays can be used in beauty therapy for: - Answer- warming
The effect of infra-red rays on the skin is to: - Answer- warm the deeper layers of the skin
An indication for a treatment with infra-red rays is: - Answer- a poor blood circulation in the skin
A contra-indication to treatment with infra-red radiation is: - Answer- skin showing teleangiectasias on the cheek area
Infra-red radiation is used: - Answer- to warm the tissues before massage
Ultra-violet radiation can be useful in beauty therapy because of the: - Answer- chemical
effect on the skin
Which of the following radiation has the most anti-bacterial effect? - Answer- UV-C
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