CIDESCO EXAM PREP QUESTIONS AND ACCURATE ANSWERS 2024/2025 |
VERIFIED
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
A characteristic of a weak acid is that it: - ✔️✔️supports the natural pH of the skin
A characteristic of a weak alkali is that it: - ✔️✔️softens the stratum corneum of the skin
VERIFIED
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
A characteristic of a weak acid is that it: - ✔️✔️supports the natural pH of the skin
A characteristic of a weak alkali is that it: - ✔️✔️softens the stratum corneum of the skin
