Hansraj College, University of Delhi

The exam is conducted in June end or July starting.

Hansraj College is one of the most reputed college and it do offers placements and is better than other colleges of Delhi University for computer science. But, yes, engineering is always preferred over BSc (H). So, if you are interested in that do go for it, else HRC is good college.

You need to clear the entrance examination of the university.

There isn't any Entrance exam this year most probably as it isnt announced in the official website.
Also, no idea if you can get into SRCC, Hindu or Hansraj. It depends on this year's cut-off.

Entrance test of Delhi University will be held in June end or July starting.

If you belong to general category, then you need at least 95% marks. If you have some reservation, then it will depend. Can you please mention your category?

B.Sc. Physics Hons is offered by the college and not applied physics.

There are a total of 92 seats for zoology in Delhi University out of which 46 are for general candidates.

Yes, of course it is only the board percentage which will be considered for the admission process. Apply online on DU official site and wait for the cut-off list.