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Three questions can be challenged to get bonus
marks for those questions according to NEET 2019 answer key.
1. Chemistry: The colloid question must be given as a bonus as it had two options to be correct. So, many might have left that question fearing they will be awarded negative marks.
2. Physics: Magnetic field inside the cylindrical conductor
question. They didn't mention whether it is a hollow or solid cylinder. So, I considered it as hollow one (by default) and considered magnetic field inside the hollow cylinder to be zero and marked that option. But NTA has considered it to be a solid cylinder. Whose mistake is this? Why should students get affected? It's better they give bonus marks to that question instead. As even a single mark is important in determining the rank of the candidate.
3. Physics: Voltmeter and ammeter question. If you don't
consider it as ideal. We will get a different answer.
I request students who got confused in these questions to
challenge these questions to get bonus marks as even a single mark can be a deciding factor.
Thanks.