1. (TCO1) The route used to transmit messages is known as: my answer:decoding

Question

encoding
decoding
feedback
noise
channel

2. (TCO1) As Claire tells about her trip to the museum, she notices Emma and Brian yawning. The information that Claire is receiving is known as: My answer: semantics

encoding
semantics
feedback
decoding
noise

3. (TCO1) You are sitting in a classroom listening to a lecture and the fluorescent light bulb is flickering which you find distracting. This is an example of:
My answer is physical noise

psychological noise
selective noise
physical noise
semantic noise

4. (TCO1) You buy a new car and you ask your neighbor, whom you respect, if he thinks you made a good purchase. The primary function of this communication exchange is:
My answer is to influence others

to get your social needs met
to influence others
to enhance and maintain your sense of self
to develop relationships

Answer 1

I don't know about 1 and 3, but 2 and 4 are definitely wrong.

Please go back and check these definitions in your text materials.

Answer 2

for number four. is it to enhance and maintain your sense of self

and number two. feedback?

Answer 3

Yes, I would choose those two. For the others, see this site.
http://en.wikipedia.org/wiki/Communication_noise

Answer 4

1. Channel
2. feedback
3. physical noise
4. Enhance self