Solution:

12111

Explanation:
11000 + 1100 + 11 => 12111

Solution:

Point

ViewPoint, BoilingPoint, CheckPoint, and PinPoint are the common word used.

Solution:

This is a Perception riddle and hence there is no right or wrong attached to this answer.

It can be considered as a sound
> It makes the sounds of branches snapping and the almighty thump when the trunk hits the hard ground. The sound is sound and doesn't rely on people to interpret it.
> Yes. And isn't that a rather arrogant question, as what about all the animals that presumably hear it?

It cannot be considered as a sound because
> Does it depend on what you mean by 'sound'? The airwaves would still vibrate but without an ear/listening device to receive them, there would be no sound.
> The sound is something within human experience. Outside of this, it's just air (or whatever another medium) vibrating. If someone is there to hear it, it makes a sound, if not, it causes rapid movement of particles.

Solution:

49.

Please watch the video for an explanation.

Solution:

30.

For Explanation, watch video

Solution:

75.

For a detailed explanation, please watch the video.

Solution:

51

For Explanation, Watch the video.

Solution:

38.

Watch the video for an explanation.

Solution:

405

For an explanation, watch the video.

Solution:

39.