RRB NTPC 2021 PYQs

Question 1

Study the given pattern carefully and select the number that can replace the question mark (?) in it.

Accepted Answer

The pattern is (first number + second number) / 2 = third number. So, (10 + 2) / 2 = 6. Thus, 6 is the correct answer.

Question 2

Which government organisation is the principal regulator of all the players operating in the Indian securities markets?

Accepted Answer

SEBI (Securities and Exchange Board of India) is the primary regulator for the Indian securities market, ensuring fair and transparent operations for all participants.

Question 3

Which of the following is the major hazard of nuclear power generation?

Accepted Answer

The primary hazard of nuclear power generation is the safe storage and disposal of radioactive waste, which remains hazardous for thousands of years.

Question 4

The Lucknow Pact of 1916 provided a joint political platform for the moderates, radicals of the Indian national Congress and the ________.

Accepted Answer

The Lucknow Pact of 1916 was a significant agreement between the Indian National Congress and the All-India Muslim League, aiming for Hindu-Muslim unity.

Question 5

The Rio Declaration on Environment and Development was approved by the United Nations in the year:

Accepted Answer

The Rio Declaration on Environment and Development, a key outcome of the Earth Summit, was adopted by the United Nations in 1992.

Question 6

Find the difference between the median and the mean of the following data:12, 20, 3, 14, 5, 8, and 15

Accepted Answer

First, arrange the data in ascending order to find the median (12). Calculate the mean by summing all numbers and dividing by 7 (11). The difference is 12 - 11 = 1.

Question 7

The perimeters of two similar triangles. ΔPQR and ΔXYZ are 48 cm and 24 cm respectively. If XY = 12 cm, then PQ is:

Accepted Answer

For similar triangles, the ratio of their perimeters equals the ratio of their corresponding sides. So, PQ/XY = Perimeter(PQR)/Perimeter(XYZ). Substitute values: PQ/12 = 48/24. Solve for PQ: PQ = 12 * 2 = 24 cm.

Question 8

Which of the following gases is a noble gas?

Accepted Answer

Noble gases are elements in Group 18 of the periodic table. Argon is one of these, known for its inertness.

Question 9

Anil alone can complete a task in 6 days and Bhushan alone can complete it in 8 days Anil and Bhushan undertook the task for Rs 3,200 with the help of chaman, they completed the task 3 days. What is Chaman's share in this earining?

Accepted Answer

Anil's 1-day work = 1/6, Bhushan's = 1/8. Together, they complete 1/3 work in 1 day. Chaman's 1-day work = 1/3 - (1/6 + 1/8) = 1/24. Their work ratio is 1/6 : 1/8 : 1/24 = 4:3:1. Chaman's share = (1/8) * 3200 = Rs 400.

Question 10

Find the sum of the numbers between 400 and 600 such that when they are divided by 6, 12 and 16, there will be no remainder.

Accepted Answer

Find the LCM of 6, 12, 16, which is 48. Identify multiples of 48 between 400 and 600 (432, 480, 528, 576). Sum these multiples to get the answer.

Question 11

Who discovered Penicillin?

Accepted Answer

Alexander Fleming, a Scottish physician and microbiologist, is credited with the discovery of penicillin in 1928, which revolutionized medicine.

Question 12

Who among the following freedom fighters was NOT involved in the Kakori Train Robbery?

Accepted Answer

Bhagat Singh was a prominent revolutionary but was not directly involved in the Kakori Train Robbery. Chandrashekhar Azad, Ram Prasad Bismil, and Ashfaqullah Khan were key figures in the incident.

Question 13

Which of the following is an example of a spreadsheet?

Accepted Answer

Microsoft Excel is a widely used spreadsheet program for organizing, analyzing, and storing data in tabular form. It is part of the Microsoft Office suite.

Question 14

Select the number from among the options given that is related to the third number in the same way as the second number is related to the first number.3 : 28 :: 9 : ?

Accepted Answer

The pattern is n : n^3 + 1. For the first pair, 3 : 3^3 + 1 = 3 : 27 + 1 = 3 : 28. Applying this to the second pair, 9 : 9^3 + 1 = 9 : 729 + 1 = 9 : 730.

Question 15

For a room, if length and breadth are given by L= (3x + 10) m and B = (2x + 5) m and the area of 4 of its walls together is (60x + 180) sq units, then the height of the room is:

Accepted Answer

The area of four walls is 2h(L+B). Substitute given L, B, and area: 2h((3x+10)+(2x+5)) = 60x+180. Simplify to 2h(5x+15) = 60x+180, which is 10h(x+3) = 60(x+3). Thus, 10h = 60, so h = 6m.

Question 16

Rakhi scored 12 marks more than Mohan. If Rakhi scored 54% marks out of a maximum of 200, how much did Mohan score?

Accepted Answer

Rakhi scored 54% of 200, which is 108 marks. Since Rakhi scored 12 marks more than Mohan, Mohan's score is 108 - 12 = 96 marks.

Question 17

Select the option that is related to the third term in the same way as the second term is related to the first term.BSTN ∶ AQUP ∶∶ DNUC ∶ ?

Accepted Answer

The pattern is -1, +1, -1, +1 for each letter. B(-1)=A, S(+1)=T, T(-1)=S, N(+1)=O. Applying this to DNUC: D(-1)=C, N(+1)=O, U(-1)=T, C(+1)=D. So, the answer is COTD.

Question 18

If ‘all philosophers are rationalists’ and ‘Socrates is a philosopher’, then which of the given conclusions follow?

Accepted Answer

Given that all philosophers are rationalists and Socrates is a philosopher, it logically follows that Socrates must also be a rationalist. This is a direct application of deductive reasoning.

Question 19

Shakila incurs a loss of 10% after selling a machine part for Rs 540. In order to gain a profit of 10%, at what price should Shakila sell the same part?

Accepted Answer

First, find the cost price (CP). If 540 is 90% of CP, then CP = 540 / 0.9 = 600. To gain 10% profit, sell at 110% of CP: 600 * 1.10 = 660.

Question 20

Who said in the Constituent assembly debate on 27 August 1947, “I believe separate electorates will be suicidal to the minorities."

Accepted Answer

Govind Ballabh Pant made this statement during the Constituent Assembly debates on August 27, 1947, advocating against separate electorates for minorities.