This is what i remember:
17-Name of vitamin C: Ascorbic Acid
18-The sky appears blue due to: tyndal effect
19-Fat soluble vitamins
20-Mixture used for welding (its chemical composition)
21-Muslim scientists belonging to different centuries (i cant remember the name of the scientist)
22-thermoplastics (which of the following is not a thermoplasic? the answer was bakelite)

Cant recall any more righ now. and dont get worried, most of above are those i wasnt sure about and had to check them latter on thats why it has been easy recalling them. Approximately 40 questions out of 50 were really easy. The rest gave you something to think about.... they give you a lot of time to do 50 MCQ's.