It's "a pair of scissors". This noun is always used in a plural form. Because "a" is for one, you cannot use it before "scissors".
It's "a pair of scissors". This noun is always used in a plural form. Because "a" is for one, you cannot use it before "scissors".
She took a pair of scissors and cut her hair.
She took a scissors and cut her hair.
Since this object consists of two sharp blades joined together, we use "a pair of".
We need a pair of scissors to cut it off.
When talking about several instances of this tool, you can use "some", "any", "both", or simply say "two pairs of scissors", "three pairs of scissors", etc.
Does anybody have any scissors?
She bought three pairs of scissors.
But omit the determiner to use this term in a general sense.
Scissors are commonly used to cut thin materials.
Remember, "scissors" only has a plural form and always takes a plural form of a verb. For example, we say "scissors are", not "scissors is".
These scissors are made from high-quality steel.
This scissors is made from high-quality steel.
Other tools that consist of two parts, and therefore take "a pair of", are listed below: