Question

Answer the following in short :-

1. Write one burn characteristic of silk

2. Write one burn characteristics of cotton and linen.

3. Name one natural fibre consisting mainly of two proteins fibrine and sericine.

4. What is the gestation period of sheep?

5. Give the two main categories of fibre. ​

Answer 1

Answer:

1. Silk Burns slowly, but does not melt.

2. Cotton and linen burn rapidly with a yellow flame.

3. Silk

4. 152 days

5. Soluble and Insoluble

Answer 2

Q)Write one burn characteristic of silk.

Ans:-

Burn characteristics of silk:-

• It has an odour of chattered meat.

• When the fire is withdrawn,it ceases  flaming.

• It burns slowly.

• It doesn't melt.

• Residue is a grayish-black ash powder.

Q)Write one burn characteristics of cotton and linen.

Ans:-

Characteristics:-

• They burn rapidly with yellow flame.

• There is an afterglow.

• A soft gray ash is left.

• Smoke is white.

Q)Name one natural fibre consisting mainly of two proteins fibrine and sericine.

Ans:-

✦Silk is the natural fibre consisting mainly of two proteins fibrine and sericine.

✦ Sericin is a natural polymer produced by silkworm.

✦It surrounds and keeps two fibroin filaments together in the silk thread used in the cocoon.

Q)What is the gestation period of sheep?

Ans:-

✦The gestation period of sheep is 152 days.

✦The length varies between breeds & individuals.

✦Conception rates are about 85% in mature sheep and goats in temperate zones during mid-breeding season.

Q)Give the two main categories of fibre.

Ans:-

The two main types of fibre:-

• Natural fibre : Obtained from natural sources i.e, Silk,cotton,wool.
• Synthetic fibres: Man-made fibre's like rayon, nylon, acrylic.

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