RRB NTPC 2021 PYQs

Question 1

CSIR scientists have conducted a genetic study for the first time in India. Where has the study been conducted?

Accepted Answer

CSIR scientists conducted India's first genetic study on the indigenous population of Lakshadweep. This was a significant scientific milestone.

Question 2

If (a + b) : (b + c) : (c + a) is 6 : 7 : 8 and also a + b + c = 14, then what is the value of c?

Accepted Answer

Let a+b=6k, b+c=7k, c+a=8k. Summing these gives 2(a+b+c) = 21k. Substitute a+b+c=14 to find k=4/3. Then c = (b+c) - (a+b+c - (c+a)) = 7k - (14 - 8k) = 7(4/3) - (14 - 8(4/3)) = 28/3 - (14 - 32/3) = 28/3 - (10/3) = 18/3 = 6.

Question 3

Privatisation of the public sector enterprises by selling off part of the equity of PSEs to the public is known as:

Accepted Answer

Selling off part of the equity of Public Sector Enterprises (PSEs) to the public is precisely the definition of disinvestment. It's a common economic term.

Question 4

Four number-pairs have been given, out of which three are alike in some manner and one is different. Select the number-pair that is different from the rest.

Accepted Answer

The pattern is that the second number is the square of the first number. 28²=784, 19²=361, 17²=289. However, 23²=529, not 539.

Question 5

Find the value of the expression[cosec(75° + θ) – sec(15° – θ) – tan(55° + θ) + cot(35° – θ)]

Accepted Answer

Use complementary angle identities: cosec(90°-A) = sec(A) and tan(90°-A) = cot(A). The expression simplifies to (sec(15°-θ) - sec(15°-θ)) - (cot(35°-θ) - cot(35°-θ)), resulting in 0.

Question 6

Which of the following is NOT a style of Hindustani classical music?

Accepted Answer

Alapana is a form of Carnatic music. Thumri, Dhrupad, and Tappa are all distinct styles within Hindustani classical music, making Alapana the correct answer.

Question 7

As of October 2020, who is the Governor of the Reserve Bank of India?

Accepted Answer

Shaktikanta Das was appointed as the Governor of the Reserve Bank of India in December 2018 and continues to hold the position as of October 2020.

Question 8

The difference between the simple interest and the compound interest on Rs.5000/- at 10% per annum for 3 years is:

Accepted Answer

Calculate SI = PRT/100 = 5000*10*3/100 = 1500. Calculate CI = P[(1+R/100)^T - 1] = 5000[(1.1)^3 - 1] = 5000[1.331 - 1] = 5000*0.331 = 1655. Difference = 1655 - 1500 = 155.

Question 9

When was the Atomic Energy amendment bill passed by parliament to allow joint ventures between public sector undertakings in nuclear power generation?

Accepted Answer

The Atomic Energy (Amendment) Bill, 2015 was passed by the Parliament in December 2015. It allowed joint ventures between PSUs for nuclear power generation.

Question 10

Who is the author of the book 'Shades of Saffron'?

Accepted Answer

The book 'Shades of Saffron: From Vajpayee to Modi' was written by Saba Naqvi. It provides an insight into Indian politics.

Question 11

Which other movement was combined with the non-cooperation movement in 1920?

Accepted Answer

The Khilafat Movement, launched by Muslim leaders, merged with Mahatma Gandhi's Non-Cooperation Movement in 1920 to present a united front against British rule.

Question 12

Which of the following is NOT a National Park in India?

Accepted Answer

Shandur National Park is located in Pakistan. The other three options – Balphakram, Anshi, and Dachigam – are all National Parks situated in India.

Question 13

In an examination, 35% students failed in one subject and 42% failed in the other subject, 30% failed in both the subjects. If total number of students is 2500 then how many students passed only in one subject?

Accepted Answer

Students failed in only one subject = (35-30)% + (42-30)% = 5% + 12% = 17%. Total students = 2500. So, 17% of 2500 = 425 students.

Question 14

The longest running train in the Indian railway network in terms of distance and time is ________.

Accepted Answer

The Vivek Express, running from Dibrugarh to Kanyakumari, covers the longest distance and time in the Indian Railways network.

Question 15

________ is one of the major factor responsible for deforestation.

Accepted Answer

Agriculture, particularly commercial farming and livestock grazing, is a primary driver of deforestation globally, as forests are cleared for land.

Question 16

The LCM of two numbers is the 20thmultiple of 3. If their HCF is 6 and one of the number is 12, then the second number is:

Accepted Answer

LCM = 3 * 20 = 60. Using the formula LCM * HCF = Product of numbers, we get 60 * 6 = 12 * second number. Solving this gives the second number as 30.

Question 17

In a certain code language, STORMY is written as ABFIDG. How will LOTUS be written as in that language?

Accepted Answer

Each letter in STORMY is directly substituted with a corresponding letter in ABFIDG. Apply the same substitution for LOTUS: L=C, O=F, T=B, U=C, S=A, resulting in CFBCA.

Question 18

In a symbolic language, 'surat is a hot place' is written as 'a hot is place surat' and 'water vapour to air here', as 'to air vapour here water', then in the same language, 'shimla is a hill place' would be written as?

Accepted Answer

The pattern is to reverse the order of words, then swap the first two words. 'surat is a hot place' becomes 'place hot a is surat', then 'a hot is place surat'. Apply this to 'shimla is a hill place'.

Question 19

Inventor of Bluetooth is _______

Accepted Answer

Jaap Haartsen, an electrical engineer, developed the Bluetooth specification while working for Ericsson in 1994, making him the inventor.

Question 20

Who won the Spanish 'La Liga' title, 2019-20?

Accepted Answer

Real Madrid C.F. secured the 2019-20 La Liga title, marking their 34th league championship. They finished five points ahead of rivals FC Barcelona.