Questions

The size of the pupil of the automatically adjusts itself according to the intensity of light passing through it; if the intensity is more, the size is less, if less, it is more. So in our case the pupil should dilate i.e , increase in size to be able to see in the dark. This switchover takes some time. But here the entry into the dark room is immediate. So the eye has no time to adjust itself and hence is not able to see at all for a while. 

Advertising is defined as a paid form of communication that reaches the target audience through mass media to provide product/service and brand related information.  

The cerebellum is a small part of the brain positioned at the back of the head, where it meets the spine, which acts as the body's movement and balance control centre.

It's a lot smaller than the cerebrum at only 1/8 of its size. But it's a very important part of the brain.