RRB NTPC 2021 PYQs

Question 1

In a certain code language, PASSPORT is written as RCUUNMPR. How will DOMINANT be written as in that language?

Accepted Answer

The pattern is +2, +2, +2, +2, -1, -2, -3, -4 for PASSPORT. Applying this same pattern to DOMINANT gives FQOKLYLR.

Question 2

As of October 2020, who is the CEO of NITI Aayog?

Accepted Answer

As of October 2020, Amitabh Kant was the CEO of NITI Aayog. He served in this position from 2016 to 2022.

Question 3

On which river is the Sardar Sarovar Dam constructed?

Accepted Answer

The Sardar Sarovar Dam is a gravity dam on the Narmada River in Kevadiya, Gujarat. It is one of the largest dams in India.

Question 4

What is the term of Non- permanent members of UN Security council?

Accepted Answer

Non-permanent members of the UN Security Council are elected for a two-year term by the General Assembly. This ensures rotation and broader representation.

Question 5

In a row of students, one student is tenth from either end of the row. How many students are there in the row?

Accepted Answer

If a student is 10th from both ends, it means there are 9 students before and 9 students after them. So, total students = 9 (before) + 1 (student) + 9 (after) = 19.

Question 6

The full form of BHEL is ______

Accepted Answer

BHEL stands for Bharat Heavy Electricals Limited. It is a public sector undertaking in India, manufacturing power generation equipment.

Question 7

The Minamata Convention in 2013 was held at Japan to address the emissions of which heavy metal?

Accepted Answer

The Minamata Convention is an international treaty designed to protect human health and the environment from the adverse effects of mercury. It was adopted in 2013.

Question 8

A sum of money doubles itself at a compound interest in 8 years. In how many years will it become four times itself?

Accepted Answer

If a sum doubles in 'n' years, it becomes 2^k times in 'n*k' years. Here, 2 times in 8 years, so 4 (which is 2^2) times in 8*2 = 16 years.

Question 9

In which year was the first radio programme broadcast in India?

Accepted Answer

The first radio programme in India was broadcast in 1923 by the Radio Club of Bombay. This marked the beginning of radio broadcasting in the country.

Question 10

If‌3x2y=‌4872then‌xyin its lowest term is:

Accepted Answer

Simplify 48/72 to 2/3. Then, 3x/2y = 2/3. Cross-multiply to get 9x = 4y, so x/y = 4/9.

Question 11

How many triangles are there in the given diagram?

Accepted Answer

Count individual triangles (6). Then count triangles formed by combining two smaller triangles (2). Finally, count the largest triangle (1). Total 6+2+1=9.

Question 12

The marks obtained by 7 students in a class in mathematics are 43, 44, 65, 41, 53, 65 and 62. The mode of the data is:

Accepted Answer

The mode is the value that appears most frequently in a data set. In the given data, 65 appears twice, which is more than any other number.

Question 13

Taxol is extracted from which plant?

Accepted Answer

Taxol, an important anti-cancer drug, is primarily extracted from the bark of the Pacific Yew tree. This is a direct factual recall question.

Question 14

A statement is given followed by two arguments. Decide which of the arguments is/are strong with respect to the statement.Statement:Life expectancy of Indians is increasingArguments:I. Yes, People are getting better medical facilities.Ii. Yes, People are doing more physical exercises now.

Accepted Answer

Both improved medical facilities and increased physical exercise directly contribute to better health and longer lifespans. Therefore, both arguments provide strong reasons for the increasing life expectancy.

Question 15

Simplify.17 × 8 - 6 + [(27 - 3) ÷ 6 - 4]

Accepted Answer

Follow BODMAS: first solve the bracket (27-3=24, then 24/6=4, then 4-4=0). Then multiply 17x8=136. Finally, 136-6+0 = 130.

Question 16

With the success of the anti-satellite (ASAT) test in 2019, with which other countries did India join the league?

Accepted Answer

India became the fourth country to successfully test an ASAT missile in 2019, joining the US, Russia, and China in this elite group.

Question 17

If we increase 50% of the numerator and 80% of the denominator of a fraction, then what fraction of the original will be the new fraction?

Accepted Answer

Let the original fraction be x/y. New numerator is 1.5x and new denominator is 1.8y. The new fraction is (1.5x)/(1.8y) = (15/18)(x/y) = (5/6)(x/y).

Question 18

The International Court of Justice is located in ________.

Accepted Answer

The International Court of Justice (ICJ) is the principal judicial organ of the United Nations, and its headquarters are located in The Hague, Netherlands.

Question 19

If X = 32× 2, Y = 23× 3 and Z = 32× 22then the L.C.M. of XY, YZ, ZX is:

Accepted Answer

First, calculate XY, YZ, ZX. Then, for LCM, take the highest power of each prime factor present in XY, YZ, and ZX. The LCM is 2^5 * 3^4 = 32 * 81 = 2592.

Question 20

50% of a number is 21 less than‌45th of that number. Find the number.

Accepted Answer

Let the number be x. Set up the equation: 0.5x = (4/5)x - 21. Simplify to 0.5x = 0.8x - 21. Solve for x: 0.3x = 21, so x = 70.