Consider the following statements about the properties and uses of Glass wool 1. Glass wool has tensile strength greater than wool . 2. Glass wool is fire proof 3. Glass wool has high electrical conductivity and absorbs moisture . 4.Glass wool is used to

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Q: 46 (CDS-II/2010)
Consider the following statements about the properties and uses of Glass wool
1. Glass wool has tensile strength greater than wool .
2. Glass wool is fire proof
3. Glass wool has high electrical conductivity and absorbs moisture .
4.Glass wool is used to prepare fibre
Which of the statements given, above are correct ?

question_subject: 

Science

question_exam: 

CDS-II

stats: 

0,13,84,13,38,18,28

keywords: 

{'glass wool': [0, 0, 1, 0], 'wool': [4, 1, 2, 4], 'properties': [0, 0, 0, 1], 'fibre': [1, 1, 1, 1], 'fire proof': [0, 0, 1, 0], 'high electrical conductivity': [0, 0, 1, 0], 'tensile strength': [0, 0, 1, 0], 'moisture': [0, 0, 1, 0]}

The correct answer is option 1: "1 and 2 only."

Let`s examine each statement to understand why this is the correct answer:

Statement 1: "Glass wool has tensile strength greater than wool."

Glass wool is known for its high tensile strength, which means it can withstand pulling forces without breaking. In comparison, wool does not have the same level of tensile strength as glass wool.

Statement 2: "Glass wool is fireproof."

Glass wool is a non-combustible material, meaning it does not catch fire easily and does not support the spread of flames. This makes it a popular choice for insulation in buildings and fire-safety applications.

Statement 3: "Glass wool has high electrical conductivity and absorbs moisture."

This statement is incorrect. Glass wool is actually a poor conductor of electricity, and it does not absorb moisture. It is a moisture-resistant material, which means it does not retain water or allow moisture to seep through easily.

Statement 4: "Glass wool is used to prepare fiber."

This statement is incorrect. Glass wool itself is a type of fiber, not used to prepare it.

Therefore, only statements 1 and 2 are correct, making option 1 the correct answer.