Fill in the blanks with appropriate words.
Synthetic fibres are also called ………………or…………. Fibres.

Fill in the blanks with appropriate words. Like synthetic fibres ,plastic is also a……………….

Fill in the blanks with appropriate words. Synthetic fibres are synthesised from raw material called ……………….. ..

What are synthetic fibres?

Fill in the blanks with suitable words. Unwanted sound is called …………………... .

Fill in the blanks with suitable words. The unit of frequency is ……………... .

Cotton fibre is

Fill in the blanks with suitable words. Loudness is determined by the …………………… of vibration .

Protein present in silk fibres are