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Which of the following statements is/are correct regarding PCR (Polymerase Chain Reaction)? 1. In this reaction, multiple copies of the gene (or DNA) of interest is synthesized in vitro using two sets of primers (small chemically synthesized oligonucleotides that are complementary to the regions of DNA) and the enzyme DNA polymerase. 2. Real-time RT–PCR is a nuclear-derived method for detecting the presence of specific genetic material in any pathogen, including a virus (COVID-19).  Select the correct answer using the code given below.
Consider the following two tables and four queries in SQL. Book (isbn, bname), Stock (isbn, copies) Query 1: SELECT B.isbn, S.copies FROM Book B INNER JOIN Stock S ON B.isbn = S.isbn;   Query 2: SELECT B.isbn, S.copies FROM Book B LEFT OUTER JOIN Stock S ON B.isbn = S.isbn; Query 3: SELECT B.isbn, S.copies FROM Book B RIGHT OUTER JOIN Stock S ON B.isbn = S.isbn;   Query 4: SELECT B.isbn, S.copies FROM Book B FULL OUTER JOIN Stock S ON B.isbn = S.isbn;   Which one of the queries above is certain to have an output that is a superset of the outputs of the other three queries?
A news paper publisher printed 4000 copies of "times of india" at a cost of Rs. 3000. He gave 1000 copies free to different technical institutions. He allowed a discount of 20%. on the published price and gave a copy free for every 20 copies bought at a time. He was able to sell all the copies in his manner. If the published price is Rs 4 per copies, then what is his over all profit or loss percentage in the whole transaction? 
Statements : Some clips are copies. Some copies are magazines. No magazines is a dictionary

Conclusions :
I. No copies are dictionary.
II. Some copies are dictionary.
III. Some copies are not dictionary.
IV. No clips are magazines.
Under Section 63 of the Indian Evidence Act, secondary evidence includes:
1. Certified copies
2. Copies made from the original by mechanical processes, and copies compared with such copies
3. Copies made from or compared with the original
4. Counterparts of documents, as against the parties who did not execute them
5. Oral accounts of the contents of a document by a person who has seen it
Read the given statements and conclusions carefully. Assuming that the information given in the statements is true, even if it appears to be at variance with commonly known facts, decide which of the given conclusions logically follow(s) from the statements. Statements: Some cards are postcards. Some cards are envelopes. All envelopes are copies. Conclusions: I. Some copies are envelopes. II. Some postcards are copies. III. Some cards are copies.
Three statements are given, followed by three conclusions numbered 1, 2 and 3. Assuming the statements to be true, even if they seem to be at variance with known facts, decide which of the conclusions logically follow(s) from the statements. Statements: All folders are copies. All books are folders. No copies are pen. Conclusions: 1. No book is a pen. 2. All books are copies. 3. Some copies are books.
One copy machine can make 20 copies a minute, and a second copy machine makes 15 copies a minute. If the two copies work together, how long would it take them to make 2100 copies?
Priya and khushi invested Rs.3000 together. Priya invested her amount at compound interest for ‘x/10’ years at x% rate interest and khushi invested half of her amount at compound interest and remaining half at simple interest at the same rate of interest for the same time period. [It is given that ‘x/10’ is a natural number] What is the value of ‘x’? Statement I: Ratio of investment of priya and khushi is 1 : 2 respectively and total sum received by them together after a particular time at x% rate of interest is Rs. 4280. Statement II: Simple interest received by khushi is Rs. 40 less than compound interest received by her. Statement III: Sum of simple interest and compound interest received by khushi after a certain time at x% rate of interest is Rs. 2500 Which of the above statement is redundant to find the answer of the given question?
The cost of setting up a magazine is Rs. 2800. The cost of paper and ink etc is Rs. 80 per 100 copies and printing cost is Rs. 160 per 100 copies. In last month 2000 copies were printed but only 1500 copies could be sold at Rs. 5 each. Total 25% profit on the sale price was realized. There is one more resource of income from magazine which is advertising. What sum of money obtained from the advertising in magazine?