Hello Buddy! Hope you're doing good.

As the bonus marks is given only when either the question is wrong or all the options are incorrect or two options are correct which is also in the  depends on the exam conducting cell. This considerations are applied to all the candidates, irrespective of the fact that whether they have attempted the question or not. So this happens only when there's some mistake in the question paper otherwise you will not getting any bonus in the IAT. Hope this helps you.

ALL THE BEST! WORK HARD !!