RRB NTPC 2021 PYQs

Question 1

How many nuclear power plants are in operation in India as of October 2020?

Accepted Answer

As of October 2020, India had 7 operational nuclear power plants. This is a factual recall question based on current affairs.

Question 2

The cause of Hepatitis A is a:

Accepted Answer

Hepatitis A is an infectious liver disease caused by the Hepatitis A virus (HAV). It is typically spread through contaminated food or water.

Question 3

Eight people are sitting at a square table. Tina is sitting opposite Urmila, who is sitting between Sharda and Nita. Sharda is diagonally opposite Priya, who is sitting to the right of Vijaya. Vijaya is facing Madhu, who is to the right of Rita. Who is sitting diagonally opposite Nita?

Accepted Answer

Place Urmila between Sharda and Nita. Tina is opposite Urmila. Sharda is diagonally opposite Priya. Vijaya is right of Priya. Madhu faces Vijaya. Rita is left of Madhu. Nita is diagonally opposite Rita.

Question 4

Small bead-like structures inside the ovary of flowers is called?

Accepted Answer

Ovules are the small, bead-like structures found inside the ovary of a flower. They contain the female reproductive cells and develop into seeds after fertilization.

Question 5

IfX=2−√3, thenX−‌1Xis:

Accepted Answer

First, find 1/X by rationalizing the denominator: 1/(2-√3) = (2+√3)/((2-√3)(2+√3)) = 2+√3. Then, X - 1/X = (2-√3) - (2+√3) = 2-√3-2-√3 = -2√3.

Question 6

According to National Waterways 1 (NW1) in India, what is the length (stretch) of Allahabad (Prayagraj)-Haldia in km?

Accepted Answer

National Waterway 1 (NW1) stretches from Prayagraj to Haldia, covering a distance of 1,620 km. This is a direct factual recall question.

Question 7

Which of the following countries doesNOTshare land boundaries with India?

Accepted Answer

Sri Lanka is an island nation located south of India, separated by the Palk Strait, thus it does not share a land boundary with India.

Question 8

The least number that should be added to 5474, so that the sum is exactly divisible by 3, 4, 6 and 8 is:

Accepted Answer

Find the LCM of 3, 4, 6, and 8, which is 24. Divide 5474 by 24. The remainder is 2. To make it divisible, add (24 - 2) = 22.

Question 9

Which of the following methods can be used for separating a mixture of NaCl and NH4CI?

Accepted Answer

Ammonium chloride (NH4Cl) sublimes upon heating, meaning it changes directly from solid to gas. Sodium chloride (NaCl) does not sublime, allowing for their separation.

Question 10

Which Indian wildlife sanctuary is the home for Asiatic Lions?

Accepted Answer

Gir National Park and Wildlife Sanctuary in Gujarat is famously the last remaining habitat for Asiatic Lions, making option 1 correct.

Question 11

Which organ in the human body produces bile juice?

Accepted Answer

The liver is the largest internal organ and plays a crucial role in digestion by producing bile, which helps in fat emulsification.

Question 12

If sec θ = 5x and tan θ =‌5x, then the value of10(x2−‌1x2)is:

Accepted Answer

Use the identity sec²θ - tan²θ = 1. Substitute the given values to find 25(x² - 1/x²) = 1. Then, multiply by 10/25 to get the required value.

Question 13

Who represented the Congress in the second round table conference held in London?

Accepted Answer

Mahatma Gandhi was the sole representative of the Indian National Congress at the Second Round Table Conference in London, following the Gandhi-Irwin Pact.

Question 14

Ina code language, if KARAN is written as 45, then how will ARUN be written as in that language?

Accepted Answer

Assign numerical values to letters (A=1, B=2,...). KARAN = 11+1+18+1+14 = 45. Similarly, ARUN = 1+18+21+14 = 54.

Question 15

Who invented the word 'Brexit'?

Accepted Answer

Peter Wilding, a British lawyer, is widely credited with coining the term 'Brexit' in 2012, referring to Britain's potential exit from the EU.

Question 16

The least positive number, which must be added to the greatest number of 4 digits in order that the sum may be exactly divisible by 307, is:

Accepted Answer

The greatest 4-digit number is 9999. Divide 9999 by 307, which gives a remainder of 175. To make it perfectly divisible, add (307 - 175) = 132.

Question 17

Astrophysicist __________, who first theorized the existence of the solar wind in 1958, became the first living individual after which NASA named a Spacecraft.

Accepted Answer

Eugene Parker first theorized solar wind in 1958. NASA named the Parker Solar Probe after him, making him the first living person to receive this honor.

Question 18

What number has to be added to each term of 3 : 5 to make the ratio 5 : 6?

Accepted Answer

Let the number be x. So, (3+x)/(5+x) = 5/6. Cross-multiply to get 6(3+x) = 5(5+x). Solve for x: 18+6x = 25+5x, which gives x = 7.

Question 19

1 Petabyte = ______

Accepted Answer

Data storage units follow a standard hierarchy where each larger unit is 1024 times the previous one. 1 Petabyte (PB) is equal to 1024 Terabytes (TB).

Question 20

L, M, N, O, P, Q, R and S are sitting in a circle facing the centre. S is to the right of R, P is to the left of N and right of L, R is to the right of O and O is to the right of N. If Q is the right of S, then who is to the right of M?

Accepted Answer

Arrange the people step-by-step: N-O-R-S-Q. P is left of N and right of L, so L-P-N. Combining gives L-P-N-O-R-S-Q. The remaining person M must be between Q and L. Thus, L is to the right of M.