RRB NTPC 2021 PYQs

Question 1

________ 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 2

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 3

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 4

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 5

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 6

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.

Question 7

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 8

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 9

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 10

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 11

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 12

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 13

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 14

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 15

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 16

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 17

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 18

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 19

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 20

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.