RRB NTPC 2021 PYQs

Question 1

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 2

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 3

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 4

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 5

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 6

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 7

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 8

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 9

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 10

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 11

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 12

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 13

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 14

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.

Question 15

PQRS is a cyclic trapezium where PQ is parallel to RS and PQ is the diameter. If ∠QPR = 40° then the ∠PSR is equal to:

Accepted Answer

Since PQ is the diameter, ∠PRQ = 90°. In ΔPQR, ∠PQR = 180° - 90° - 40° = 50°. As PQRS is a cyclic quadrilateral, ∠PSR + ∠PQR = 180°. So, ∠PSR = 180° - 50° = 130°.

Question 16

Observe the graph and answer the question below.The graph represents the number of male and female workers in four different companies.Which company has the maximum difference in the number of male and female employees?

Accepted Answer

Calculate the absolute difference between male and female workers for each company from the graph. Company D has the largest difference (70-30=40), making it the correct answer.

Question 17

If x2- 4x + 1 = 0, then what is the value ofx2+‌1x2?

Accepted Answer

Divide the given equation by x to get x + 1/x = 4. Then square both sides: (x + 1/x)^2 = 4^2, which simplifies to x^2 + 1/x^2 + 2 = 16. Thus, x^2 + 1/x^2 = 14.

Question 18

Which sector is the biggest emitter of greenhouse gases?

Accepted Answer

The energy sector, encompassing electricity, heat, and transport, is globally the largest contributor to greenhouse gas emissions due to fossil fuel combustion.

Question 19

Who is the overall best performer considering all the games?

Accepted Answer

To find the overall best performer, sum the scores for each player across all games. Player A has the highest total score, making them the best performer.

Question 20

Study the given pie charts and answers the question that follows.The pie charts represent the values of sales and expenses of five companies A, B, C, D, E in terms of percentages.Based on the visual reading of the pie-chart, which company is the most profitable in percentage terms.

Accepted Answer

Profitability is (Sales - Expenses) / Expenses. Visually, Company C has the largest difference between sales and expenses, with sales significantly higher than expenses, indicating the highest profit percentage.