AND

Kamini sent in her applications and waited by the phone for a response.

 
To suggest that one work is the result of another:
Ramesh heard the weather report and promptly went to his house.

To suggest that one idea is in contrast to another (frequently replaced by but in this usage):
Naresh is brilliant and Shalini has a pleasant smile.

To reflect an element of surprise (sometimes replaced by yet in this usage):
Mumbai is a rich city and suffers from many elements of urban blight.

To reflect that one clause is conditionally dependent upon another (usually the first clause imperative) :
Use your credit cards without care and you'll soon find yourself deep in debt.
Waste your time carelessly and you will soon find yourself out of time to prepare for the examinations

Rajesh became addicted to gambling- and that surprised no one who knew him.

BUT

To reflect a contrast that is unexpected in light of the first clause:
Johny lost a fortune in the stock market, but he still seems able to live quite comfortably.

To reflect in an affirmative sense what the first part of the sentence implied in a negative way (sometimes replaced by on the contrary):
The club never invested foolishly, but used the services of some intelligent counselors,

To connect two ideas with the meaning of 'with the exception of, (and then the second word takes over as subject):
Everybody but Jai Kishan is trying out for the team.

OR

To suggest that only one possibility can be realized, excluding one or the other:
You study hard for this exam or you will not get good marks

To suggest the inclusive combination of alternatives:
We can cook dinner tonight, or we can just eat leftovers.

To suggest a refinement of the first clause:
Saraswati College is the premier all-girls, college in the state, or so it seems to most Saraswati College alumnae.

 
To suggest a 'restatement' or correction of the first part of the sentence:
There are no tigers in this sanctuary or so our guide tells us.

To suggest a negative condition:
The sayings of one of the freedom fighters was very important 'Do or die'.

To suggest a negative alternative without the use of an imperative:
They must approve his political style or they wouldn't keep electing him Chairman.

NOR

The Conjunction NOR is not used as often as the other Conjunctions, so it might feel a bit odd when nor does come up in conversation or writing. It is commonly used in the correlative pair, neither-nor (see below)
He is neither sane nor intelligent.
That is neither what I said nor what I wanted to say.
'Nor' can also be used with other negative expressions:

That is not what I wanted to say, nor should you interpret my statement as an admission of guilt.

YET

The word YET functions sometimes as an adverb. It can be used to reflect several meanings: 

(i) in addition ("yet another cause of trouble' or a simple yet noble woman'), 

(ii) even ("yet more expensive'), 

(iii) still ('he is yet a novice'), 

(iv) eventually they may yet win'), 

(v) and so soon as now ('he's not here yet). 

'Yet' also functions as a Coordinating Conjunction meaning something like 'nevertheless or 'but'. 

(a) Jack plays basketball well, yet his favorite sport is cricket.
(b) The visitors complained a lot about the heat, yet they continued to play golf here every day.

FOR

The word 'FOR' is most often used as a preposition. It is also used, as a Coordinating Conjunction Beginning a sentence with the Conjunction 'for' should be avoided. Its function is to introduce the reason for the preceding clause

(a) Ramesh thought he had a good chance to get the job, for his uncle was on the company's board of directors.
(b) Most of the visitors were happy just relaxing under the shade, for it had been a long, dusty journey on the cart.

SO

So, sometimes connects two independent clauses along with a comma, but sometimes it doesn't. For instance, in this sentence:
(a) He is not the only Olympic athlete in his family, so are his brother, sister, and his niece Chetna. Here the word so means 'as well' or 'in addition'.
In the following sentence, 'So' means, therefore, the Conjunction and the comma are adequate to the task:
(b) She has always been nervous in large gatherings, so it is no surprise that she avoids crowds of her fans.
When 'So' is used at the beginning of a sentence, it will act as a kind of summing up word, in that case, a comma is used after it (So) as following:
(c) So, the Judge peremptorily removed the child from the custody of the claimants.