Hi Aastha, Hope you are doing well.
SRMJEE exam has two types. 
1) For engineering where each question carries 3 marks in physics, chemistry and mathematics each of 105 marks. There is a negative marking of 1 for each incorrect answer.
2) For medical, there is physics, chemistry and Biology of 3 marks per question. Here the negative marking for physics and chemistry is the same while the negative marking for biology is 0.7 marks for each incorrect answer.

Hope it answered your question.
Good Luck.

Hiii..

There will be a negative markingpattern for any wrong answer. For Mathematics, Chemistry, Physics questions, there will be a deduction of one mark whereas for Biology questions, there will be penalty of 0.7marks for each wrong answer.

Hope you get it