KBC Questions and Quiz, Multiple Choice Questions and Answers

Question: With which metal does oxygen combine to form rust?

1. Iron
   
2. Platinum
   
3. Gold
   
4. Silver
   

Incorrect Answer

Correct Answer
Oxygen combines with iron to form rust.

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Question: Rust on iron is basically...?

1. An oxide
   
2. A nitride
   
3. A chloride
   
4. A sulphide
   

Incorrect Answer

Correct Answer
Rust on iron is basically an oxide.

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Question: Which of the following metals is often found in the pure state?

1. Iron
   
2. Aluminum
   
3. Gold
   
4. Magnesium
   

Incorrect Answer

Correct Answer
Gold is often found in the pure state.

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Question: Metals that can be easily beaten into sheets are known as _______ metals.

1. Beatable
   
2. Polymer
   
3. Malleable
   
4. Ductile
   

Incorrect Answer

Correct Answer
Metals that can be easily beaten into sheets are known as malleable metals.

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Question: Rocks that are rich in metals are known as...?

1. Metalloids
   
2. Allotropes
   
3. Slag
   
4. Ores
   

Incorrect Answer

Correct Answer
Rocks that are rich in metals are known as ores.

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Question: Which metal is extracted from the ore 'bauxite'?

1. Magnesium
   
2. Iron
   
3. Tungsten
   
4. Aluminum
   

Incorrect Answer

Correct Answer
Aluminum is extracted from the ore 'bauxite'.

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Question: Which of the following does not belong to this group?

1. Iron
   
2. Sodium
   
3. Oxygen
   
4. Lead
   

Incorrect Answer

Correct Answer
Oxygen is a non-metal (gas) whereas iron, sodium, and lead are metals.

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Question: Fill in the missing word: _________ + oxygen = Magnesium oxide

1. Carbon
   
2. Metal
   
3. Magnesium
   
4. Manganese
   

Incorrect Answer

Correct Answer
The reaction of magnesium with oxygen produces magnesium oxide.

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Question: Which of the following is a pure substance made up of one type of atoms?

1. A mixture
   
2. An element
   
3. A compound
   
4. An atom
   

Incorrect Answer

Correct Answer
An element is defined as a pure substance made up of one type of atoms and cannot be further subdivided into simpler substances by any physical or chemical means.

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Question: Stainless steel is a an alloy of _______, _______, chromium, and nickel.

1. Copper, zinc
   
2. Aluminum, tin
   
3. Iron, carbon
   
4. Lead, magnesium
   

Incorrect Answer

Correct Answer
Stainless steel is a mixture (alloy) of iron, carbon, chromium, and nickel. Carbon gives hardness to the mixture. Chromium and nickel give a silvery look to the mixture.

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