CSIR NET 2023 Chemical Science Previous Year Paper (27-Dec-2023)

Question 1

A flight of 13 steps from the ground to a platform of height 3 m is to be carpeted. The steps are all equal and have tread a and rise b. The staircase starts from a point on the ground horizontally 4 m away from the edge of the platform as shown.

Assuming that the width of the carpet is adequate, what is the length of the carpet (in meter) needed to cover all the steps?

Accepted Answer

7

Answer

5

Answer

$(3a+4b)/ \sqrt{13}$

Answer

$ \sqrt{13}(a+b) $

Question 2

The floor shown in the figure is to be covered with square tiles. If all tiles are to be of the same size, what is the smallest number of tiles that will do the job?

Accepted Answer

16

Answer

14

Answer

6

Answer

32

Question 3

Shyam buys a watch at a 10% discount on its maximum retail price (MRP). He sells it to Mohan for Rs. 3960 making a profit of 10%. What is the MRP (in Rs.) of the watch?

Accepted Answer

4000

Answer

4040

Answer

3960

Answer

4356

Question 4

A bucket has 10 L water at 15°C. How much water at 50°C should be added to get a mixture of temperature 40°C? (Assume no heat loss in mixing.)

Accepted Answer

25 L

Answer

15 L

Answer

20 L

Answer

30 L

Question 5

Consider three configurations of steel wires for bearing a load.A. 2 wires of 1 mm diameter each, together.B. 1 wire of 2 mm diameter.C. 4 wires of 1 mm diameter each, together.The correct comparison of the load bearing capability of the three configurations is:

Accepted Answer

A < B = C

Answer

A = B = C

Answer

A < C < B

Answer

A = B > B

CSIR NET 2023 Chemical Science Previous Year Paper (27-Dec-2023)

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