Verbal Reasoning - Logical Deduction Questions

Which of the statements is sufficient to answer the question?

Question:
Find the sum of the first 10 numbers in the series.

Statements:
I. The first number is 2 and number is 20.
II. The common difference is 2.

Lycopene, glutathione, and glutamine are powerful antioxidants that neutralize the free radicals that are produced in the body as a result of routine bodily processes. An excess of these free radicals in your system causes rapid aging because they accelerate the rate of cellular damage. Aging is simply the result of this damage. Thus, to slow down aging it is necessary to supplement your diet with these antioxidants on a daily basis. 

Which of the following, if true, most seriously undermines the author's contention?

A company recruits satisfying the following criteria -

1. Candidates who secured at least 85% in standard 10th or equivalent.
2. Candidates who secured at least 65% in standard 12th or equivalent.
3. Candidates who are not from commerce background.

Who among the following candidates will the company definitely select?

In the question two statements are given, followed by two conclusions, I and II. You have to consider the statements to be true even if it seems to be at variance from commonly known facts. You have to decide which of the given conclusions, if any, follows from the given statements.

Statement 1 : No squares are rectangles.
Statement 2 : All rectangles are triangles.

Conclusion I : Some triangles are squares.
Conclusion II : Some triangles are rectangles.

Effect : The temple at the religious site wears a deserted look with the number of devotees trickling down.

Which of the following can be a possible cause of the above effect?

Gold demand has fallen in the first half due to rising prices and the trend is likely to continue in the second half.

Conclusions :

I. Customers are very price-sensitive

II. There will be no improvement in demand in the second half

According to the National Agricultural Aviation Society (NAAS), without the use of crop protection products to control insects, weeds, and diseases, crop yields per acre will drop by more than 50 percent. The first aerial appligreion of insecticide occurred in 1921, and it was a huge success. By contrast, in today's economy all aircraft that are classified as aerial appligreors do more than just apply insecticide; today, they also spread seed and apply fertilizer. 

From the information given above it CANNOT be validly concluded that

Looking for a job is difficult enough, the task becomes impossible if you do not have the skill of being pleasant, polite and polished.

Conclusions :

I. A person who has social etiquetteis eligible for any job

II. Many candidates no matter how excellently  qualified are likely to fail to get the jobs they are going to try for because of their manners.