Fill in the blanks with appropriate words. (a) Synthetic fibres are also called ________or _________fibres.

There are some fibres that are prepared by man by using chemicals. These are called synthetic fibres. These are made of small units that join together to form long chains....

Rayon is different from synthetic fibres because:  (b) It is obtained from wood pulp. 

The natural fibers are obtained from plants and animals, whereas the synthetic fibers are obtained by chemical processing of petrochemicals. Unlike natural fibers, manufacturing of synthetic fibers do not require...

(a) Time taken by an object to complete one oscillation is called time period.  (b) Loudness is determined by the amplitude of vibration.  (c) The unit of frequency is hertz (Hz).  (d) Unwanted...

(a) silk, wool (b) cocoons, moth (c) hair (d) air, conductor

Natural Fibres : wool, cotton, silk, jute Synthetic Fibres : nylon, polyester

a) Plant fibres are obtained from jute and cotton. b) Animals fibres are silk and wool

(a) aluminium – foil, aircrafts, etc. (b) plastic – bucket, pencil box, etc. (c) kerosene – fuel, solvent, etc. (d) vinegar – food ingredient, preservative, etc.

(i) hand picking; (ii) grains; (iii) sieving; (iv) sedimentation; (v) solid, liquid

(a) wind (b) mixture (c) direction (d) cylinders