CSIR NET 2025 Mathematical Sciences Question Paper (18-Dec-2025)

Question 1

Five students graduated from a college, not all in the same year, after each has studied for four years. If batchmates Jiten and Anwar were between Ramesh and Prakash but senior to Sam while Ramesh had left the college before Jiten took admission, then it is certain that

Accepted Answer

Ramesh was the most senior

Answer

Anwar was the most senior

Answer

Sam was the most junior

Answer

Prakash was the most junior

Question 2

Which among the following cities can be said most appropriately to bear the same relation to Tamil Nadu that Pune bears to Maharashtra; Surat to Gujarat and Asansol to West Bengal?

Accepted Answer

Coimbatore

Answer

Tirupati

Answer

Mysore

Answer

Chennai

Question 3

The geometric mean of 100 observations is 25. If each observation is multiplied by 4, what will be the new geometric mean?

Accepted Answer

100

Answer

50

Answer

25

Answer

$(25	imes4)^{1/2}$

Question 4

Alloy A is formed by mixing iron (Fe) and nickel (Ni) in the ratio 3:4, while alloy B is formed by mixing Fe and Ni in the ratio 9:5. If equal quantities of alloys A and B are melted together to form a new alloy C, what will be the ratio of Fe to Ni in the alloy C?

Accepted Answer

15:13

Answer

4:3

Answer

5:3

Answer

13:9

Question 5

Two identical metal bars are heated to different temperatures and allowed to cool in the same surroundings. Which one of the following figures correctly shows their cooling curves?

Accepted Answer

C

Answer

A

Answer

B

Answer

D

CSIR NET 2025 Mathematical Sciences Question Paper (18-Dec-2025)

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