KBC Questions and Quiz, Multiple Choice Questions and Answers

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.

Science Quiz

---

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.

Science Quiz

---

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.

Science Quiz

---

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.

Science Quiz

---

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

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

Incorrect Answer

Correct Answer

Science Quiz

---

Question: A pH below 7 indicates...?

1. Alkalinity
   
2. Presence of ions
   
3. Purity of the sample
   
4. Acidity
   

Incorrect Answer

Correct Answer
A pH scale reading less than 7 indicates acidity.

Science Quiz

---

Question: Which of the following gases is green in color?

1. Chlorine
   
2. Hydrogen
   
3. Krypton
   
4. Neon
   

Incorrect Answer

Correct Answer
Chlorine gas is green in color.

Science Quiz

---

Question: What is the combination of any substance with oxygen known as?

1. Combustion
   
2. Reduction
   
3. Hydrogenation
   
4. Oxidation
   

Incorrect Answer

Correct Answer
The combination of any substance with oxygen is known as oxidation.

Science Quiz

---

Question: Which of the following is not an allotrope of carbon?

1. Diamond
   
2. Graphite
   
3. Charcoal
   
4. Silk
   

Incorrect Answer

Correct Answer
Silk is not an allotrope of carbon whereas charcoal, diamond, and graphite are allotropes of carbon.

Science Quiz

---

Question: The 'fizz' in soft drinks is caused by...?

1. Helium
   
2. Carbon dioxide
   
3. Nitrogen
   
4. Hydrogen
   

Incorrect Answer

Correct Answer
The 'fizz' in soft drinks is caused by Carbon dioxide.

Science Quiz

---