Miscellaneous (Railway Maths)

Total Questions: 34

11. A mango kept in a basket doubles every one minute. If the basket gets completely filled by mangoes in 30 minutes, then in how many minutes half of the basket was filled? [RRB NTPC 04/01/2021 (Morning)]

Correct Answer: (d) 29
Solution:

In every minute mangoes in the basket get doubled, so in the last minute that is in the 30th minute, it is also doubled and filled completely, which means up to 29 minutes, the basket is half filled.

12. Ram has a movie in his pen drive that takes 1.75 GB of space. He wants to share it with his friends. The speed of transferring the file is 2MBs. How much time will it take to transfer the file? (1GB = 1000MB) [RRB NTPC 16/01/2021 (Morning)]

Correct Answer: (c) 14 min 35 s
Solution:

13. If y = x/(2 + a)², then z = ? [RRB NTPC 29/01/2021 (Evening) ]

Correct Answer: (d)
Solution:

14. A beautician’s income includes her salary and the tips she gets for her services. During a particular week, if her tips were 5/4 of her salary, then what fraction of her income came from the tips? [RRB NTPC 01/02/2021 (Morning)]

Correct Answer: (c) 5/9
Solution:

15. How will you write 9.08 hours in hours, minutes and seconds? [RRB NTPC 01/02/2021 (Morning)]

Correct Answer: (b) 9 hours, 4 minutes, 48 seconds
Solution:

9.08 hours in hours = 9 hours + 0.08 hours = 9 hours 4 min 48 sec.
Where - 60 min. = 1 hours, 60 sec.= 1 min.

16. A competitive exam is to be held on a particular day. The examiner who has to supervise the exam enters the examination room 30 minutes before 2:30 hours. He came 40 minutes before the student who was 20 minutes late for the exam. At what time will the examination start? [RRB NTPC 10/02/2021 (Morning)]

Correct Answer: (b) 2:20 hours
Solution:

17. If the first term of a geometric progression is 2 and the common ratio is 3, then what will be the fifth term of the geometric progression? [RRB NTPC 22/02/2021 (Morning)]

Correct Answer: (a) 162
Solution:

18. When notebooks are distributed in a class, each child gets notebooks equivalent to one-eighth of the number of children in the class. If the number of children were halved, then each child would get 16 notebooks. How many notebooks are distributed in total? [RRB NTPC 11/03/2021 (Evening)]

Correct Answer: (a) 512
Solution:

19. The electricity bill of an establishment is partly fixed and partly varies as per the number of units of electricity consumed. In a certain month, when 480 units were consumed, then the bill was Rs. 1,620. In another month, when 690 units were consumed, then the bill was Rs. 2,250. In the next month, if 500 units are consumed, then the bill for that month will be: [RRB NTPC 11/03/2021 (Evening)]

Correct Answer: (c) Rs. 1,680
Solution:

20. The price of commodity X increases by 40 paise every year, while the price of commodity Y increases by 25 paise every year. If, in the year 2002, the price of X was Rs. 5.20 and that of Y was Rs. 6.30, then in which year would commodity X cost 40 paise more than commodity Y ? [RRB NTPC 11/03/2021 (Evening) ]

Correct Answer: (d) 2012
Solution: