Simplification (Railway Maths) (401 to 450)

Total Questions: 50

1. What is the value of the following expression ? [RRB NTPC 12/01/2021 (Morning) ]

(− 20)³  + (13)³  + (7)³

Correct Answer: (b) - 5460
Solution:

2. If √45 + √125 = 17.89, then what will be the value of √180 + √80 ? [RRB NTPC 12/01/2021 (Evening)]

Correct Answer: (c) 22.4
Solution:

3. 1.236576576 can be written in the form of : [ RRB NTPC 12/01/2021 (Evening) ]

Correct Answer: (c) 123534/99900
Solution:

4. Which of the following options is equal to 16 ÷ 4 x 2 - 5 + 1 ? [ RRB NTPC 13/01/2021 (Morning) ]

Correct Answer: (d) [{(16 ÷ 4) x 2} - 5] + 1
Solution:

5. The ratio in lowest terms of 4767 and 11123 is: [ RRB NTPC 13/01/2021 (Morning) ]

Correct Answer: (c) 3 : 7
Solution:

6. The value of √4 is: [ RRB NTPC 13/01/2021 (Morning) ]

Correct Answer: (a) 2 or -2
Solution:

7. If (a + b√2)² = 19 + 6√2 , then a is equal to. [ RRB NTPC 13/01/2021 (Morning) ]

Correct Answer: (a) 1
Solution:

8. Find the value of [ RRB NTPC 13/01/2021 (Evening) ]

Correct Answer: (d) 1.24
Solution:

9. Find the value of [ RRB NTPC 13/01/2021 (Evening) ]

Correct Answer: (a) 18
Solution:

10. If x is the closest approximation to the product 0.3333 x 0.25 x 0.499 x 0.125 x 24 , then find the value of x. [ RRB NTPC 16/01/2021 (Morning) ]

Correct Answer: (b) 1/8
Solution: