CIDESCO Practice Questions V2 with verified detailed ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
solutions
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. - correct answer✔✔1 and
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
2 are incorrect
||\\//|| ||\\//|| ||\\//||
Characteristics of life include? - correct answer✔✔Growth and Metabolism ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Examples of organic biological substances are? - correct answer✔✔Carbohydrates and Fats
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Examples of minerals substances are? - correct answer✔✔Paraffins and Petroleum
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Matter is everything that? - correct answer✔✔Occupies space and has weight
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Condensation is the change of matter from? - correct answer✔✔A gas to a liquid ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Vaporization is the change of matter from? - correct answer✔✔A liquid to a gas ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Melting is the change of matter from? - correct answer✔✔A solid to a liquid
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Sublimation is the change of matter from? - correct answer✔✔A solid to a gas ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Condensation is? - correct answer✔✔The change of a vapour to a liquid ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
,An example of a single-celled cellular organism is? - correct answer✔✔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 - correct answer✔✔1 is incorrect, 2
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
is correct ||\\//||
Science deals mainly with? - correct answer✔✔Physics and chemistry ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
The study of the functions of living organisms is? - correct answer✔✔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. - correct
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
answer✔✔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 - correct answer✔✔1
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
and 2 are correct
||\\//|| ||\\//|| ||\\//|| ||\\//||
Which one of the following belongs to the science of chemistry? - correct answer✔✔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. - correct answer✔✔1. is
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
incorrect
2. is correct
||\\//|| ||\\//||
The field of physics includes? - correct answer✔✔heat and electricity
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
An anion is a? - correct answer✔✔Negatively charged atom
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
A cation is a? - correct answer✔✔Positively charged sodium atom (Na+)
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
An electrolyte is a? - correct answer✔✔salt-solution
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
An acid is an electrolyte because? - correct answer✔✔it can conduct an electric current
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
pH can be decreased by? - correct answer✔✔increasing hydrogen-ions
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
pH is? - correct answer✔✔the number of free h-ions in a solution
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
If the pH of a solution is between 5 and 7, the solution is a? - correct answer✔✔Weak Acid
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
If the pH of a solution is between 7 and 9, the solution is a? - correct answer✔✔Weak Alkali
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
The pH of distilled water is? - correct answer✔✔7
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Lemon juice, with a pH reading of about 2, is considered to be? - correct answer✔✔Acidic
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
, Substances having a pH value above 9.5 are considered to be? - correct answer✔✔Alkaline ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
The pH of the skin's acid mantle is? - correct answer✔✔5.5
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
A characteristic of a weak acid is that it? - correct answer✔✔Supports the natural pH of the
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
skin
A characteristic of organic acids is that? - correct answer✔✔They contain the element
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
carbon (C) ||\\//||
An organic acid contains the chemical group? - correct answer✔✔C00H
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
An anode is a? - correct answer✔✔Positively charged electrode
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
A cathode is a? - correct answer✔✔Negatively charged electrode
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Examples of electrodes which are used in beauty therapy are? - correct answer✔✔The
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
needles used for galvanic electrolysis ||\\//|| ||\\//|| ||\\//|| ||\\//||
In physics, radiation means? - correct answer✔✔The electro-magnetic waves in space
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
In physics, frequency means? - correct answer✔✔The number of times per second an
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
electro-magnetic-wave can change direction ||\\//|| ||\\//|| ||\\//||
Hertz, is a unit of? - correct answer✔✔Frequency
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
solutions
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. - correct answer✔✔1 and
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
2 are incorrect
||\\//|| ||\\//|| ||\\//||
Characteristics of life include? - correct answer✔✔Growth and Metabolism ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Examples of organic biological substances are? - correct answer✔✔Carbohydrates and Fats
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Examples of minerals substances are? - correct answer✔✔Paraffins and Petroleum
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Matter is everything that? - correct answer✔✔Occupies space and has weight
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Condensation is the change of matter from? - correct answer✔✔A gas to a liquid ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Vaporization is the change of matter from? - correct answer✔✔A liquid to a gas ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Melting is the change of matter from? - correct answer✔✔A solid to a liquid
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Sublimation is the change of matter from? - correct answer✔✔A solid to a gas ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Condensation is? - correct answer✔✔The change of a vapour to a liquid ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
,An example of a single-celled cellular organism is? - correct answer✔✔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 - correct answer✔✔1 is incorrect, 2
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
is correct ||\\//||
Science deals mainly with? - correct answer✔✔Physics and chemistry ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
The study of the functions of living organisms is? - correct answer✔✔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. - correct
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
answer✔✔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 - correct answer✔✔1
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
and 2 are correct
||\\//|| ||\\//|| ||\\//|| ||\\//||
Which one of the following belongs to the science of chemistry? - correct answer✔✔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. - correct answer✔✔1. is
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
incorrect
2. is correct
||\\//|| ||\\//||
The field of physics includes? - correct answer✔✔heat and electricity
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
An anion is a? - correct answer✔✔Negatively charged atom
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
A cation is a? - correct answer✔✔Positively charged sodium atom (Na+)
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
An electrolyte is a? - correct answer✔✔salt-solution
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
An acid is an electrolyte because? - correct answer✔✔it can conduct an electric current
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
pH can be decreased by? - correct answer✔✔increasing hydrogen-ions
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
pH is? - correct answer✔✔the number of free h-ions in a solution
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
If the pH of a solution is between 5 and 7, the solution is a? - correct answer✔✔Weak Acid
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
If the pH of a solution is between 7 and 9, the solution is a? - correct answer✔✔Weak Alkali
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
The pH of distilled water is? - correct answer✔✔7
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Lemon juice, with a pH reading of about 2, is considered to be? - correct answer✔✔Acidic
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
, Substances having a pH value above 9.5 are considered to be? - correct answer✔✔Alkaline ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
The pH of the skin's acid mantle is? - correct answer✔✔5.5
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
A characteristic of a weak acid is that it? - correct answer✔✔Supports the natural pH of the
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
skin
A characteristic of organic acids is that? - correct answer✔✔They contain the element
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
carbon (C) ||\\//||
An organic acid contains the chemical group? - correct answer✔✔C00H
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
An anode is a? - correct answer✔✔Positively charged electrode
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
A cathode is a? - correct answer✔✔Negatively charged electrode
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Examples of electrodes which are used in beauty therapy are? - correct answer✔✔The
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
needles used for galvanic electrolysis ||\\//|| ||\\//|| ||\\//|| ||\\//||
In physics, radiation means? - correct answer✔✔The electro-magnetic waves in space
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
In physics, frequency means? - correct answer✔✔The number of times per second an
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
electro-magnetic-wave can change direction ||\\//|| ||\\//|| ||\\//||
Hertz, is a unit of? - correct answer✔✔Frequency
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
