
Science ph1 mock quizzizzziz
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23 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Describe an alloy.
Very light metal
Mixture of two or more metals
Aluminium
Metal specifically used for electrical fittings
Answer explanation
An alloy is defined as a mixture of two or more metals, which enhances properties like strength and corrosion resistance. The correct choice highlights this fundamental characteristic of alloys.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the specific gravity of butane in relation to air?
0.6
1
2
1.5
Answer explanation
Butane has a specific gravity of approximately 2 in relation to air, meaning it is twice as dense as air. This makes option 2 the correct choice.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What material is a sacrificial anode typically made of?
Magnesium
Lead
Copper
Aluminium
Answer explanation
A sacrificial anode is typically made of magnesium because it has a higher electrochemical potential than other metals, making it effective in preventing corrosion by sacrificing itself.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Name the process of protecting steel from rusting by coating it with a thin layer of zinc.
Dezinicification
Electrolysation
Galvanisation
Oxidisation
Answer explanation
The process of protecting steel from rusting by coating it with zinc is called galvanisation. This method prevents corrosion by providing a protective layer that acts as a barrier against moisture and oxygen.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the scientific name given for the rainwater cycle?
Urban cycle
Hydrological cycle
Water table
H₂O
Answer explanation
The rainwater cycle is scientifically known as the hydrological cycle. It describes the continuous movement of water on, above, and below the surface of the Earth, encompassing processes like evaporation, condensation, and precipitation.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
When water is turned into steam, approximately how much will be produced from 1m³ of water?
10m³
16m³
160m³
1,600m³
Answer explanation
When water turns to steam, it expands significantly. 1m³ of water produces about 1,600m³ of steam due to this expansion, making 1,600m³ the correct answer.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What numbers identify the pH of pure water on the potential hydrogen scale?
12
1
6–7
–273
Answer explanation
The pH scale ranges from 0 to 14, with 7 being neutral. Pure water typically has a pH around 7, so the correct choice is 6–7, indicating that pure water is slightly acidic to neutral.
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