RRB NTPC 2020 PYQs

Question 1

In 1931, who among the following was the President of the Indian National Congress?

Accepted Answer

Sardar Vallabhbhai Patel presided over the Karachi Session of the Indian National Congress in 1931. This session is notable for adopting resolutions on Fundamental Rights and National Economic Programme.

Question 2

Who is the author of ‘Rajatarangini’?

Accepted Answer

Kalhana was a 12th-century Kashmiri historian who authored the historical chronicle 'Rajatarangini', detailing the history of Kashmir.

Question 3

Given below is the marks obtained by 20 students in mathematics out of 30 marks.7, 9, 12, 12, 13, 12, 14, 14, 14, 14, 15, 16, 17, 18, 18, 19, 20, 18, 20, 13. Then (2 × median — mode) of the data is equal to:

Accepted Answer

First, arrange the data in ascending order. The median is the average of the 10th and 11th terms (14+14)/2 = 14. The mode is 14 (appears 4 times). So, 2 × 14 - 14 = 14.

Question 4

If '@' indicates either '+' or '×'; what will be the minimum value of '1@2@3@4@5'?(Note: We have a choice to replace each of the four @ signs in the expression by either '+' or '×' operation)

Accepted Answer

To minimize the value, use multiplication for smaller numbers and addition for larger numbers. The optimal combination is 1+2+3+4×5 = 1+2+3+20 = 26. No, wait. The optimal combination is 1+2+3+4+5 = 15. No, wait. The optimal combination is 1*2*3*4*5 = 120. No, wait. The optimal combination is 1*2+3+4+5 = 2+3+4+5 = 14.

Question 5

The  value of√72×18+√0.04+√0.64is:

Accepted Answer

Simplify each term: √(72×18) = √1296 = 36. √0.04 = 0.2. √0.64 = 0.8. Summing these: 36 + 0.2 + 0.8 = 37.

Question 6

Which is the 29thstate of India created in 2014?

Accepted Answer

Telangana was carved out of Andhra Pradesh and officially became the 29th state of India on June 2, 2014.

Question 7

Where are the Summer Olympic Games going to be held in 2021?

Accepted Answer

The 2020 Summer Olympics were postponed to 2021 due to the pandemic and were held in Tokyo, Japan. This was a widely publicized event.

Question 8

The simple interest on an amount of Rs. 13400 for 4 years is Rs. 2680. The rate of interest is:

Accepted Answer

Use the simple interest formula: Rate = (Simple Interest × 100) / (Principal × Time). Substitute the given values to find the rate of interest.

Question 9

If‌√19−x√121=√4−√3then the value of x is equal to:

Accepted Answer

Simplify the given equation. Square both sides to eliminate the outer square root. Compare the terms to find the value of x. The equation simplifies to 19 - x√121 = 4 - √3, leading to x = 2 + 2√3.

Question 10

Bile is secreted by the _______.

Accepted Answer

Bile is produced by the liver, which is the largest internal organ. It aids in fat digestion and absorption in the small intestine.

Question 11

Intel core i9 is a type of ____

Accepted Answer

Intel Core i9 is a well-known series of central processing units (CPUs) manufactured by Intel, making it a type of processor.

Question 12

As of October 2020, who is the Chairman of the Fifteenth Finance Commission of India?

Accepted Answer

N. K. Singh is the current Chairman of the Fifteenth Finance Commission of India, appointed in November 2017. This is a direct factual recall question.

Question 13

Who devised the policy of Doctrine of Lapse?

Accepted Answer

Lord Dalhousie, Governor-General of India from 1848 to 1856, is credited with devising and implementing the Doctrine of Lapse policy.

Question 14

'A' can complete a piece of work in 20 days and 'B' alone can complete the work in 30 days. Due to some other work, 'A' had to leave the work before completion and for the last 5 days 'B' alone did the work. The total time taken to complete the work is:

Accepted Answer

A's 1-day work is 1/20, B's is 1/30. B worked alone for 5 days, completing 5/30 = 1/6 of the work. Remaining work (5/6) was done by A and B together. Their combined 1-day work is 1/20 + 1/30 = 1/12. So, they worked together for (5/6) / (1/12) = 10 days. Total time = 10 + 5 = 15 days.

Question 15

The area of a rectangle is 300 cm2and the length of its diagonal is 25 cm. The perimeter of the rectangle (in cm) is:

Accepted Answer

Let length be 'l' and breadth be 'b'. Given lb = 300 and l² + b² = 25² = 625. We know (l+b)² = l² + b² + 2lb. Substitute values to find (l+b) and then perimeter 2(l+b).

Question 16

In a game Rajesh lost‌13of his money in the first round of the game, in the second round he losses‌35of his remaining money and in the third round he lost‌47of the rest. He is left with what part of original sum of monely?

Accepted Answer

After losing 1/3, 2/3 remains. After losing 3/5 of remaining, 2/5 of remaining (2/3) is left. After losing 4/7 of rest, 3/7 of rest (2/5 * 2/3) is left. Multiply (2/3)*(2/5)*(3/7) = 4/35.

Question 17

Among the following words, which one will come in the middle if they are arranged as per their order in an English dictionary?1. Dance 2. Degree 3. Dare 4. Dear 5. Development

Accepted Answer

Arrange the words alphabetically: Dance, Dare, Dear, Degree, Development. The word 'Dear' comes in the middle (3rd position) of this sorted list.

Question 18

Through which of the following mediums sound CANNOT travel?

Accepted Answer

Sound requires a medium (solid, liquid, or gas) to propagate. Vacuum lacks particles, so sound waves cannot travel through it.

Question 19

If AMBER = 27 and BROWN = 14. then GREEN will be equal to:

Accepted Answer

Assign numerical values to letters (A=1, B=2, etc.). Sum the values for AMBER (1+13+2+5+18=39) and BROWN (2+18+15+23+14=72). The given values are 39-12=27 and 72-58=14. The pattern is sum of letters minus (sum of digits of sum). So, for GREEN (7+18+5+5+14=49), 49-(4+9)=36.

Question 20

A 2 m deep and 21 m wide river is flowing at the rate of 5 km/h. How many kilolitres of water will fall into the sea in 10 min?

Accepted Answer

Calculate the distance water travels in 10 min (5 km/h = 5000/60 m/min). Multiply this distance by depth and width to get volume in m³. Convert m³ to kilolitres (1 m³ = 1 kl).