RRB NTPC 2021 PYQs

Question 1

The National Informatics Centre (NIC) was established in:

Accepted Answer

The National Informatics Centre (NIC) was established in 1976. It is a premier technology organization under the Ministry of Electronics and Information Technology.

Question 2

Mahatma Gandhi's first major public appearance in India after returning from South Africa was at the opening of the ________ in February 1916.

Accepted Answer

Mahatma Gandhi's first significant public speech in India after returning from South Africa was at the inauguration of Banaras Hindu University in February 1916.

Question 3

The Book - The Test of My Life - was written by-

Accepted Answer

The book 'The Test of My Life: From Cricket to Cancer and Back' is the autobiography of Indian cricketer Yuvraj Singh, detailing his battle with cancer.

Question 4

What is the average of 4.2, 3.8 and 7.6?

Accepted Answer

Sum the numbers (4.2 + 3.8 + 7.6 = 15.6) and divide by the count (3). 15.6 / 3 = 5.2.

Question 5

A and B can finish a work in 9 days, B and C can finish it in 12 days and A and C can finish it in 18 days. In how many days can A, B and C finish the work together?

Accepted Answer

Calculate individual work rates: (A+B)'s 1/9, (B+C)'s 1/12, (A+C)'s 1/18. Summing these gives 2(A+B+C)'s rate. Halve it for (A+B+C)'s rate, then take the reciprocal for total days.

Question 6

A bank provides a loan at the rate of 5% per annum to a trader on an amount of Rs.12,50,000 for 5 years. The simple interest to be paid is:

Accepted Answer

Use the simple interest formula: SI = (P * R * T) / 100. Substitute P=12,50,000, R=5, T=5. Calculate (1250000 * 5 * 5) / 100 = 3,12,500.

Question 7

For every 18 eggs that Noori buys, three eggs turn out to be rotten. At the same rate, how many good eggs will Noori have if she buys 690 eggs?

Accepted Answer

For every 18 eggs, 3 are rotten, so 15 are good. The good egg ratio is 15/18 = 5/6. For 690 eggs, good eggs = (5/6) * 690 = 575.

Question 8

The  given shows the number of students in a hostel speaking different languages:LanguagesHindiEnglishMarathiTamilBengaliTotalNumber of Students2522129472Which language is spoken by atleast 1 out of 3 students residing in the hostel?

Accepted Answer

Total students are 72. One-third of students is 72/3 = 24. Hindi is spoken by 25 students, which is more than 24. Thus, Hindi is the correct answer.

Question 9

Simplify.‌46‌+‌34‌×‌32−637−‌34×(34−6)

Accepted Answer

Follow BODMAS: first solve the parenthesis (34-6=28). Then perform multiplications (34×32=1088, 34×28=952). Finally, add and subtract from left to right: 46 + 1088 - 637 - 952 = 4.

Question 10

Which Navratna company is fondly called 'Vizag steel'?

Accepted Answer

Rashtriya Ispat Nigam Limited (RINL) is a Navratna company based in Visakhapatnam, Andhra Pradesh, and is commonly known as 'Vizag Steel'.

Question 11

If α and β are the zeroes of the polynomial x2– 5x + m such that α – β = 1, then what will be the value ofm.

Accepted Answer

Given α+β = 5 and α-β = 1. Solving these equations gives α=3, β=2. Since αβ = m, substitute the values to get m = 3*2 = 6.

Question 12

In the given△KMN, PQ is parallel to MN. If‌KPPM=‌413and KN = 20.4 cm, find KQ

Accepted Answer

By Basic Proportionality Theorem, KP/PM = KQ/QN. Given KP/PM = 4/13. So KQ/QN = 4/13. Total KN = KQ + QN. Let KQ = 4x and QN = 13x. Then 4x + 13x = 17x = 20.4 cm. So x = 1.2 cm. Thus, KQ = 4 * 1.2 = 4.8 cm.

Question 13

Which number among the given options does not belong to the following series?4, 7, 13, 26, 49, 97

Accepted Answer

The pattern is (previous number * 2) - 1. So, 4*2-1=7, 7*2-1=13, 13*2-1=25. Thus, 26 is incorrect; it should be 25.

Question 14

On which river is Idukki Dam built?

Accepted Answer

The Idukki Dam is a significant arch dam located in Kerala, India. It is constructed across the Periyar River, which is one of the longest rivers in Kerala.

Question 15

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 16

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 17

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 18

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 19

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 20

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.