CSIR NET 2024 Earth Science Previous Year Paper (25-Jul-2024)

Question 1

An ecologist catches 25 fish tags them and releases them back in the pond. She catches 30 fish on the next day, of which 10 carry the tag. Assuming that the fish in the pond remain unchanged and each fish has equal probability of being caught, what is the estimated number of fish in the pond?

Accepted Answer

75

Answer

30

Answer

150

Answer

300

Question 2

The following dishes are offered in a restaurant.Starter: Tomato Soup or Vegetable Salad or Chicken Soup Main course: Chicken Biryani or Fish Biryani or Veg Biryani Dessert: Gulabjamun or Rasagulla A meal is prepared selecting one item from each category. What is the probability that a randomly drawn up menu is vegetarian?

Accepted Answer

2/9

Answer

1/3

Answer

5/8

Answer

1/2

Question 3

An eagle is sitting at the top of a 100 m high vertical cliff and a mouse is at the base of the cliff. The mouse starts running away from the cliff on a level ground in a straight line at a speed of 10 m/s. The eagle spots the mouse and dives at 45° to the ground at a speed of 20 m/s and captures the mouse. The time at which the eagle started the dive is

Accepted Answer

around 3 s after the mouse started running.

Answer

around 5 s after the mouse started running.

Answer

around 7 s after the mouse started running.

Answer

the same at which the mouse started running.

Question 4

Two vessels contain $ \frac {3}{8}$L and  $ \frac {2}{7}$L of alcohol. Water is added to both vessels to make each solution measure 1L. When these solutions are mixed, the alcohol to water ratio would be approximately

Accepted Answer

1:2

Answer

16:21

Answer

1:4

Answer

1:3

Question 5

A wholesale shopkeeper purchased 200 identical watches and sold the first 50 at 10% profit, the next 50 at 20% profit, the next 50 at 25% profit and the last 50 at 40% profit. If his total profit was Rs 19000, at what total cost did he buy the watches?

Accepted Answer

Rs 80000

Answer

Rs 76000

Answer

Rs 86000

Answer

Rs 96000

CSIR NET 2024 Earth Science Previous Year Paper (25-Jul-2024)

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