1. How do you ensure that you base your software plans, work items and products on the requirement?

Breaking down the requirements into use-cases and unit test
plans before starting the design ....

if into product development / long term development -
automate these use cases and unit tests into regression
tests ... otherwise, just have a check-list document in
every phase of code-delivery, before sending it to testing
for the QA teams ....

4. What will you do if you find that you cannot meet the requirements?

THIS CHANGES YOU FIND ONCE YOU DO THE GAP ANALYSIS, THEN
TLAK TO CUSTOMER AND CHNAGE OR GIVE PROCESS PATH TO ACHIVE
THIS REQUIREMENT

5. If you had an infinite supply of water and a 5 quart and 3 quart pail, how would you measure exactly 4 quarts?

Fill 5 quart pail and transfer to 3 quart pail. you are
left with 2 quart of water in 5 quart pail.Then remove
water from 3 quart pail and transfer that 2 quart of water
to 3 quart pail. Refill 5 quart pail again and transfer 1
quart of water to already 2 quart filled 3 quart pail. you
are left with 4 quarts of water in 5 quart pail.

6. If you are on a boat and you throw out a suitcase, will the level of water increase?

It depends on the density of the briefcase.

While the briefcase is in the boat, it will displace it's
weight in water.

If the briefcase floats after you toss it out, then it still
displaces its weight in water, and there is no change.

However, if the briefcase is heavier than water it will
displace its volume, not its weight. The amount of displaced
water will be less (which is why it sank) and the water
level will decrease.

8. There are 3 ants at 3 corners of a triangle, they randomly start moving towards another corner. What is the probability that they dont collide?

The probability is 25% because there are 3 ants all with
two possible paths and 8 total possible outcomes. But
there are two possible outcomes that the ants don't
collide. Either they move one way or the other. 2/8 = 25%.

9. If you look at a clock and the time is 3:15, what is the angle between the hour and the minute hands?

6 degrees.

It is like this:

Rule:-Difference b/w every hour is 30 degrees.

and every hour is divided in 5 parts.

at 3:15 the angle will be: 30/5=6.