Science KBC Quiz & KBC Questions, Multiple Choice Questions and Answers

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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Question: Which of the following is a pure substance made up of two or more types of atoms or elements?

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

Incorrect Answer

Correct Answer
A compound is defined as a pure substance made up of two or more types of elements (atoms) chemically combined in a fixed proportion, and it can be further subdivided into simpler substances by chemical means only.

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Question: Copper sulfate can be further subdivided into simpler substances by chemical means only. Therefore, it is...?

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

Incorrect Answer

Correct Answer
Copper sulfate is a pure substance made up of two types of elements (atoms) chemically combined in a fixed proportion, and it can be further subdivided into simpler substances by chemical means only. Therefore, it is a compound.

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Question: Which of the following is the smallest part of a compound, whose properties are the same as those of the compound?

1. Molecule
   
2. Mixture
   
3. Element
   
4. Atom
   

Incorrect Answer

Correct Answer
A molecule is the smallest part of a compound, whose properties are the same as those of the compound.

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Question: Which of the following is an impure substance made up of two or more types of atoms or elements?

1. Element
   
2. Mixture
   
3. Compound
   
4. Molecules
   

Incorrect Answer

Correct Answer
A mixture is defined as an impure substance made up of two or more types of elements (atoms) or compounds or both mechanically mixed in any proportion, and it can be further subdivided into simpler substances by physical (mechanical) means.

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Question: Fill in the missing word: Acid + _______ = Salt + Water

1. Metal
   
2. Non Metal
   
3. Base
   
4. Oxygen
   

Incorrect Answer

Correct Answer

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