Question

d) Name the most common silk.

e) Bacterium which causes sorter’s disease.

f) The country from where silk industry started.

g) Process of taking out silk – threads from cocoon.

III) Write true or false:

a)Sot silk yarn is strong as comparable thread of steel. { }

b)Shearing hurts the sheep. { }

c)Small fluffy fibres are called burrs. { }

VI) Define :

a) Shearing

b) Seri Culture.

c) Selective Breeding

d) Rearing

Chapter 4 : Heat

I) Fill in the blanks :

1) ______________ is a device used for measuring temperature.

2) The materials which allow heat to pass through them easily are __________ of heat.

3) Clinical thermometer is used to measure our _____________

4) Wool is poor __________________ of heat and it has air trapped in between the

fibres.

5) In ______________ generally the heat is transferred by conduction.

II) True or False :

1) The materials which do not allow heat to pass them easily are called insulators.

2) In liquids and gases the heat is transferred by conduction.

3) A kink near the bulb of a clinical thermometer prevents mercury level from falling of

its own.

4) We get heat from the sun by radiation.

5) Digital thermometers contain mercury. III) Define:

1) Temperature 3. Conduction

2) Radiation 4.Convection

IV) Name the following:

a) The movement of cool air from land towards sea.

b) Two conductors of heat

c) Two insulators of heat

V) Dis7nguish between

• Conductors and insulators.

• Clinical and laboratory thermometer​

Answer 1

Answer:

bhot zayada question nahi puchte tu try it ur self

Answer 2

Heyy!! I know some of the answers
Fill in the blanks
1)thermometer
2)good conductors
3human temperature
4)conductor
5)fluids
11) 1.true
True
Don’t know
True
Maybe false
Temperature-the degree of heat and coldness of a body
Conduction:- the transfer of heat from one object to another or from one molecule to another
Radiation- a fastest mode of heat transfer which pass through waves
Convection- the mode of transfer of heat from a place at a higher temperature to place at lower temperature
1v) land breeze
2)silver, copper
3) lead,wood
V) the substances which allow heat to pass through them are called conductors
The substances which don’t allow heat to pass through them easily are called insulators
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