CIDESCO EXAM PREP EXAM|| ACTUAL EXAM
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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
,2|Pag e
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
,3|Pag e
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-)
, 4|Pag e
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
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