UPSC CSE 2023 (Prelims) CSAT Official Paper (28-May-2023)

Question 1

In the expression 5 * 4* 3* 2* 1, * is chosen from +, -, × each at most two times. What is thesmallest non-negative value of the expression?

Accepted Answer

0

Answer

3

Answer

1

Answer

2

Question 2

A certain number of men can complete a piece of work in 6k days, where k is a natural number.By what percent should the number of men be increased so that the work can be completed in5k days?

Accepted Answer

20%

Answer

10%

Answer

(50/3)%

Answer

25%

Question 3

X, Y and Z can complete a piece of work individually in 6 hours, 8 hours and 8 hours respectively. However, only one person at a time can work in each hour and nobody can work for two consecutive hours. All are engaged to finish the work. What is the minimum amount of time that they will take to finish the work.

Accepted Answer

6 hours 45 minutes

Answer

6 hours 15 minutes

Answer

6 hours 30 minutes

Answer

7 hours

Question 4

How many consecutive zeros are there at the end of the integer obtained in the product 12 × 24× 36 × 48 ×.... × 2550?

Accepted Answer

200

Answer

50

Answer

55

Answer

100

Question 5

On January 1st, 2023, a person saved Rs 1. On January 2nd, 2023, he saved Rs. 2 more than
that on the previous day. On January 3rd, 2023, he saved Rs. 2 more than that on the previous
day and so on. At the end of which date was his total savings a perfect square as well a perfect
cube?

Accepted Answer

8th January, 2023

Answer

7th January, 2023

Answer

9th January, 2023

Answer

Not possible

UPSC CSE 2023 (Prelims) CSAT Official Paper (28-May-2023)

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