Which of the following words is plural?

Scissors (কাচিঁ) হচ্ছে Pair noun.
- Pair noun সবসময় plural হয়।

Pair noun: 
- A pair noun is plural in form and takes a plural verb. Example: Trousers, glasses, scissors, etc. 
- Pair noun এর পরে সবসময় verb এর plural form হয়। 

• কিছু word দেখতে plural হলেও singular হিসেবে ব্যবহৃত হয়। যেমন:
1) Names of subjects - Mathematics, Physics, Electronics, etc.
2) Names of common diseases - Measles, Mumps, Rickets.
3) Names of some games - Billiards, Draughts.
4) The word ‘News’.
5) Ethics (নীতিবিদ্যা) singular হিসেবে বুবহৃত হয়।

Source:
1. Applied English Grammar & Composition by P. C. Das.
2. A Passage to the English Language by S.M. Zakir Hussain.