RRB NTPC 2021 PYQs

Question 1

Land which is left without cultivation for one or less than one agricultural year is known as:

Accepted Answer

Land left uncultivated for one agricultural year or less is specifically termed 'current fallow' to allow soil recovery. This is a direct definition.

Question 2

The length of a rectangle is‌35of the radius of a circle. The radius of a circle is equal to the side of a square whose area is 4900 m2. What is the area of the rectangle if its breadth is 20 m.

Accepted Answer

First, find the side of the square (70m) from its area. This is the circle's radius. Then, calculate the rectangle's length (3/5 of 70m = 42m). Finally, multiply length by breadth (42m * 20m) to get the area.

Question 3

A and B borrowed the same amount for the same period. A borrowed on simple interest at the rate of 8% yearly. B borrowed on compound interest of 5% half yearly. At the end of one year the ratio of B's interest to that of A's interest is:

Accepted Answer

Assume principal P=100. A's SI = 100 * 8% * 1 = 8. B's CI for 5% half-yearly (10% annual equivalent) is 100 * (1 + 0.05)^2 - 100 = 10.25. Ratio B:A = 10.25:8 = 41:32.

Question 4

Which of the following is the correct full form of 'MRTP' in MRTP Act 1969?

Accepted Answer

The MRTP Act 1969 stands for Monopolies and Restrictive Trade Practices Act. It was enacted to prevent concentration of economic power.

Question 5

UN was founded as a successor to the League of Nations on 24th October _________.

Accepted Answer

The United Nations officially came into existence on October 24, 1945, after the UN Charter was ratified by a majority of its signatories.

Question 6

If the value of J = 25 and GAME = 65 then, which of the following would be the value of BASIC?

Accepted Answer

Each letter is assigned a value based on its position in the alphabet (A=1, B=2, etc.), then multiplied by 5. Sum these values for each word. J=10*5=50 (error in question, should be 50). GAME = (7+1+13+5)*5 = 26*5 = 130. BASIC = (2+1+19+9+3)*5 = 34*5 = 170.

Question 7

The area of a circular park is 1386 m2. If a path of the width 7 m is laid around and inside the park. Then the area of the path is:

Accepted Answer

First, find the radius of the park using its area. Then, calculate the new radius (original radius - path width). Finally, subtract the inner circle's area from the original park's area to get the path's area.

Question 8

Select the number from among the given options that can replace the question mark(?) in the following table.2118942?18847236

Accepted Answer

Observe the pattern: the first number is twice the second, and the second number is twice the third. So, 42 / 2 = 21, and 21 / 2 = 10.5. In the second row, 42 / 2 = 21, and 18 * 2 = 36. Thus, the missing number is 36.

Question 9

If the area of a circle is 154 cm2, then the circumference of the circle is:

Accepted Answer

Given area is 154 cm². Use πr² = 154 to find radius r = 7 cm. Then, calculate circumference using 2πr = 2 × (22/7) × 7 = 44 cm.

Question 10

Which city was the cleanest city of India (in category Cities >10 Lakh) as per Swachh Survekshan 2020?

Accepted Answer

Indore was declared the cleanest city in India for the fourth consecutive time in the Swachh Survekshan 2020 rankings, specifically in the category of cities with over 10 lakh population.

Question 11

Rahul is the brother of Raj. Radha is the sister of Raman. Raj is the son of Radha. Then how is Rahul related to Radha?

Accepted Answer

Raj is Radha's son. Rahul is Raj's brother. Therefore, Rahul is also Radha's son. The relationship is direct parent-child.

Question 12

If Bill Gates had his way, by what name was Windows OS planned to be released?

Accepted Answer

Windows OS was initially planned to be released under the name 'Interface Manager' by Bill Gates. The name 'Windows' was later adopted due to its broader appeal.

Question 13

Which one country of the following was not a part of former USSR?

Accepted Answer

Finland was never a part of the USSR. Moldova, Georgia, and Russia were all constituent republics of the Soviet Union.

Question 14

The total population of a village is 4,000. The number of males and females increases by 10% and 20% respectively and consequently the population of the village becomes 4500. What was the number of males in the village prior to the new members coming in?

Accepted Answer

Let males be M and females be F. M + F = 4000. After increase, 1.10M + 1.20F = 4500. Solve these two linear equations to find M = 3000.

Question 15

Baichung Bhutia was the first Indian sportsman to refuse to carry the Olympic torch relay to support the -

Accepted Answer

Baichung Bhutia refused to carry the Olympic torch relay in 2008 to show solidarity with the Tibetan Independence Movement, protesting China's human rights record.

Question 16

Alignment of chromosomes in the center of the cell at the equatorial plate constitutes which stage of mitosis?

Accepted Answer

Chromosomes align at the equatorial plate during metaphase, a key characteristic of this stage in mitosis. This alignment ensures equal distribution.

Question 17

Ram Prasad Bismil was hanged for ______.

Accepted Answer

Ram Prasad Bismil was a key revolutionary involved in the Kakori Train Action of 1925, for which he was subsequently arrested and hanged.

Question 18

Which industry uses limestone as raw material?

Accepted Answer

Limestone is a primary raw material for cement production. It is crushed, mixed with other materials, and heated to form clinker, which is then ground into cement.

Question 19

Find the rate of interest for a sum that becomes‌1464110000times of itself in 4 years compounded annually.

Accepted Answer

Let P be the principal. Amount A = P(1 + R/100)^T. Given A/P = 14641/10000 and T=4. So (1 + R/100)^4 = (11/10)^4. Thus, 1 + R/100 = 11/10, which gives R = 10%.

Question 20

Colonial rule was first established in:

Accepted Answer

The British East India Company established its first major colonial foothold and administrative control in Bengal, particularly after the Battle of Plassey.