RRB NTPC 2021 PYQs

Question 1

What was the first domain name ever registered in the World Wide Web?

Accepted Answer

Symbolics.com was the first .com domain name ever registered, on March 15, 1985. It marked a significant milestone in internet history.

Question 2

10.53 divided by 0.09 gives:

Accepted Answer

To divide 10.53 by 0.09, remove decimals by multiplying both by 100. This gives 1053 divided by 9, which equals 117.

Question 3

The difference of two numbers is 20% of the larger number. If the smaller number is 40, then find the larger number.

Accepted Answer

Let the larger number be X. The difference is X - 40. This difference is 20% of X. So, X - 40 = 0.20X. Solving for X gives 0.80X = 40, hence X = 50.

Question 4

The LCM of 82× 63and 46× 93is:

Accepted Answer

First, express all numbers as prime factors: 8²×6³ = (2³) ²×(2×3)³ = 2⁶×2³×3³ = 2⁹×3³. Similarly, 4⁶×9³ = (2²)⁶×(3²)³ = 2¹²×3⁶. For LCM, take the highest power of each prime factor: 2¹² and 3⁶. So, LCM is 2¹²×3⁶.

Question 5

Out of the four words listed, three are alike in some manner and one is different. Select the odd one.

Accepted Answer

Latch, Seal, and Lock are all mechanisms used to secure or close something. A Key is used to operate a lock, making it the odd one out.

Question 6

Who wrote the famous Bangla novel ‘Pather Panchali?

Accepted Answer

Bibhutibhushan Bandopadhyay is the acclaimed author of the iconic Bangla novel 'Pather Panchali'. This is a direct factual recall question.

Question 7

In a school, 60% of the students passed in an examination. If the number of failed candidates is 240, then the number of candidates that have passed is:

Accepted Answer

If 60% passed, then 40% failed. Since 40% equals 240, 1% is 6. Therefore, 60% (passed students) is 60 * 6 = 360.

Question 8

Sushil Kumar won the Olympic medal for:

Accepted Answer

Sushil Kumar is a renowned Indian wrestler who has won multiple Olympic medals, including a bronze in 2008 and a silver in 2012.

Question 9

When is International Dance Day celebrated?

Accepted Answer

International Dance Day is celebrated annually on April 29th. This date commemorates the birth anniversary of Jean-Georges Noverre, a pioneer of modern ballet.

Question 10

In a firm the ratio of male and female members was 4 ∶ 5. The firm decided to increase the number of males by 80% and the number of females by 60%. What will be the new ratio of male members to female members in the firm?

Accepted Answer

Initial ratio is 4:5. Males increase by 80% (4 * 1.8 = 7.2). Females increase by 60% (5 * 1.6 = 8). New ratio is 7.2:8, which simplifies to 9:10.

Question 11

As of October 2020, who is the Vice President of India?

Accepted Answer

As of October 2020, M Venkaiah Naidu was the Vice President of India. He served from 2017 to 2022.

Question 12

Shree Guru Nanak Dev Ji was born in Rai Bhoi Ki Talwandi (present day Nankana Sahib) in:

Accepted Answer

Guru Nanak Dev Ji, the founder of Sikhism, was born in 1469 at Rai Bhoi Ki Talwandi, now known as Nankana Sahib, Pakistan.

Question 13

At what rate percent per annum will the simple interest in 15 years on a sum of money be‌34of the sum invested?

Accepted Answer

Let the principal be P. Simple Interest (SI) = (3/4)P. Time (T) = 15 years. Using SI = (P * R * T) / 100, substitute values: (3/4)P = (P * R * 15) / 100. Solve for R to get 5%.

Question 14

If ΔABC and ΔPQR are similar and‌BCQR=‌13, find‌ar(∆‌PQR)ar(∆‌BCA)

Accepted Answer

The ratio of areas of similar triangles is the square of the ratio of their corresponding sides. Given BC/QR = 1/3, so QR/BC = 3/1. Thus, ar(PQR)/ar(BCA) = (QR/BC)^2 = (3/1)^2 = 9.

Question 15

Which of the following was adopted by Lord Dalhousie to annex Indian states?

Accepted Answer

Lord Dalhousie implemented the Doctrine of Lapse to annex Indian states where rulers died without a natural heir, leading to British control.

Question 16

The average weight of an apple in a sample of 10 apples was calculated as 104 g. Later on, it was found that the weighing had shown the weight of each apple 20 g less. The correct average weight of an apple in that sample is:

Accepted Answer

Each apple's weight was 20g less than actual. So, the correct weight for each apple is 104g + 20g = 124g. The average remains the same as each apple's weight is corrected by the same amount.

Question 17

When was INSAT 1B commissioned?

Accepted Answer

INSAT-1B was a multi-purpose satellite launched by India. It was successfully commissioned in the year 1983, marking a significant milestone in India's space communication.

Question 18

By selling a car for Rs. 1,20,000, David makes a profit of 20%. What will be the selling price of the car if he sells it at 30% profit?

Accepted Answer

First, find the cost price (CP) using the 20% profit. CP = 120000 / 1.20 = Rs. 1,00,000. Then, calculate the selling price for 30% profit: 100000 * 1.30 = Rs. 1,30,000.

Question 19

Which of these is NOT a part of capital receipt?

Accepted Answer

Capital receipts either create a liability or reduce financial assets. Tax is a revenue receipt, not a capital receipt, as it neither creates liability nor reduces assets.

Question 20

A is 5 times as good as workman as B and therefore is able to complete a job in 60 days less than B. In how many days will they finish it working together?

Accepted Answer

Let B take 'x' days. A takes 'x/5' days. Given x - x/5 = 60, so 4x/5 = 60, x = 75 days. A takes 15 days. Together, 1/15 + 1/75 = 6/75 = 2/25. So, they take 25/2 = 12.5 days.