You are looking for Csir model question papers of mathematics; so here I am providing you some questions:

1. The reason for the hardness of diamond is
(a) Extended covalent bonding
(b) Layered Structure
(c) Formation of cage structure
(d) Formation of tubular structure

2. The acidity of normal rain water is due to
(a) SO2
(b) CO2
(c) NO2
(d) NO

For complete paper here I am giving you a link, you can to the link:

http://ims4maths.com/coaching/files/...%28Open+PDF%29