Page 2 - ha1

Q2 What is reeling? 1 K
Q3 Write different stages in life cycle of silk moth? 1 K
Q4 What is incubation period of eggs of silk moth? 1 U
Q5 Which stages of silk moth last about 27 days? 1 U

Conceptproperties& Qualities of silk
SL. Questions Marks Skills
No.
Q1. Name the strongest natural fibre. 1 K
Q2 Write the factors on which quality of silk fibric depends? 1 U
Q3 How can you assure that silk fibre absorb moisture? 1 U&A
Q4 Why silk is called royal fabric? 1 U
Q5 Why silk fabrics does not attract dart and dust? 1 U

Concept_ Lab Activity:

Differentiate between woollen, silk & nylon fibre by performing flame test
SL. Questions u Skills
No.
Q1. On burning smell of plant fibres is equal to 1 U
Burning smell of paper b) Burning smell of plastic c) Burning
smell of hair d) None of these
Q2 Synthetic fibres on subject to flame 1 U
a) Curl away from flame b) Cath fire easily c) Melt on burning
d) Don’t catch fire

Q3 Ash of burning animal fibres is 1 U
Soft and smooth b) Form uncrushable beads c) Form
crushable bead d) None of these
Q4 Woollen& silk fibres on subject to flame 1 U
a) Curl away from flame b) Cath fire easily c) Melt on burning
d) Don’t catch fire

Q5 Ash of burning plant fibres is 1 U
Soft and smooth b) Form uncrushable beads c) Form
crushable bead d) None of these.

ConceptHealth hazards, Causes, its effects&Prevention:

SL. Questions Marks Skills
No.
Q1. Name the bacteria causing anthrax. 1 K
Q2 Write two important precautionary measure to minimize 1 U
occupational hazard.

2