RRB NTPC 2020 PYQs

Question 1

Two dice are thrown simultaneously and the sum of the numbers appearing on them is noted. What is the probability that the sum is 12?

Accepted Answer

The only way to get a sum of 12 with two dice is (6,6). There are 36 total possible outcomes (6x6). So, the probability is 1/36.

Question 2

Symbol for Methane is

Accepted Answer

Methane is the simplest hydrocarbon, consisting of one carbon atom bonded to four hydrogen atoms. Its chemical formula is CH4.

Question 3

If the mass of a person is 60 kg on the surface of earth then the same person’s mass on the surface of the moon will be:

Accepted Answer

Mass is an intrinsic property of an object and remains constant regardless of location. Weight, however, changes with gravity. Thus, the mass on the Moon is 60 kg.

Question 4

Jan Shikshan Sansthan (JSS) operates under the aegis of:

Accepted Answer

Jan Shikshan Sansthan (JSS) focuses on vocational training and skill development, aligning directly with the Ministry of Skill Development and Entrepreneurship's mandate.

Question 5

Find the sum of the greatest 3-digit number and the smallest 4 digit number that have 24 as their HCF.

Accepted Answer

The greatest 3-digit number divisible by 24 is 984. The smallest 4-digit number divisible by 24 is 1008. Their sum is 984 + 1008 = 1992.

Question 6

If a + b = 8 and a2+  b2= 12, then the value of a3+ b3is:

Accepted Answer

Use (a+b)² = a²+b²+2ab to find ab. Then apply a³+b³ = (a+b)(a²-ab+b²). Substitute the values to get the result.

Question 7

Who was the founder of the Vishishtadvaita philosophy?

Accepted Answer

Ramanujacharya is credited with founding the Vishishtadvaita school of Hindu philosophy, emphasizing qualified non-dualism.

Question 8

In ΔABC, ∠A = 90°, AB = 6 cm and AC = 8 cm. If AD is perpendicular to BC, the AD is equal to:

Accepted Answer

First, find BC using Pythagoras theorem (10 cm). Then, equate the area of the triangle calculated in two ways: (1/2) * AB * AC = (1/2) * BC * AD. Solve for AD.

Question 9

If‌x2+‌2y=1and‌y2+‌2z=1, then the value of‌z2+‌2xis:

Accepted Answer

By substituting x=1, y=0, and z=0 into the given equations, we find that both equations are satisfied. Therefore, substituting these values into the expression z²+2x gives 0²+2(1) = 2.

Question 10

The capacity of working by A and B is in the ratio 3 : 4. If A takes 12 days to finish the work, the time taken by B to finish the same work is:

Accepted Answer

Efficiency and time are inversely proportional. If A:B efficiency is 3:4, then time taken will be 4:3. So, 4 units = 12 days, 1 unit = 3 days. B takes 3 units = 9 days.

Question 11

Which famous author used the pen name Madhavikutty?

Accepted Answer

Kamala Das, a renowned Indian English and Malayalam author, famously used the pen name Madhavikutty for her Malayalam writings. This is a direct factual recall.

Question 12

As of November 2020, Who is the Education minister of India?

Accepted Answer

As of November 2020, Dr. Ramesh Pokhriyal 'Nishank' was the Union Minister of Education. This is a direct factual recall question.

Question 13

'Operation Greens' is a government scheme for:

Accepted Answer

Operation Greens aims to stabilize the supply and prices of Tomato, Onion, and Potato (TOP) crops, reducing post-harvest losses and ensuring better returns for farmers.

Question 14

When the integer m is divided by 8, the remainder is 5. What is the remainder if 7m is divided by 8?

Accepted Answer

Given m leaves a remainder of 5 when divided by 8. So, m can be written as 8k + 5. Then 7m = 7(8k + 5) = 56k + 35. Dividing 35 by 8 gives a remainder of 3. Thus, 7m divided by 8 leaves a remainder of 3.

Question 15

Where is the Central Potato Research Institute of India located?

Accepted Answer

The Central Potato Research Institute (CPRI) is located in Shimla, Himachal Pradesh. It was established in 1949.

Question 16

Of the 360 students who sat for Class X Board exams, 10% students scored A grade, 20% students scored B grade, 30% students scored C grade and 40% scored D grade. From the given pie chart, find the total number of students who scored Grade A and Grade B.

Accepted Answer

Total students are 360. Grade A students are 10% of 360 = 36. Grade B students are 20% of 360 = 72. Total A and B grade students = 36 + 72 = 108.

Question 17

Bella is taller than Shubham. Umesh is taller than Shubham but shorter than Bella. Salman is shorter than Rahul and Shubham. Shubham is taller than Rahul. Who is the shortest in the group?

Accepted Answer

Establish the height order: Bella > Umesh > Shubham > Rahul > Salman. Salman is shorter than both Rahul and Shubham, making him the shortest.

Question 18

'Antrix Corporation Limited, Bengaluru' is a

Accepted Answer

Antrix Corporation Limited is the commercial arm of the Indian Space Research Organisation (ISRO). It markets ISRO's products and services globally.

Question 19

Which of the following is the assumption for the claim that 'Pleasure is desirable'?

Accepted Answer

For pleasure to be 'desirable' in a general sense, it must be something universally sought. If everyone desires pleasure, then it is inherently desirable.

Question 20

When was the Dowry Prohibition Act commenced?

Accepted Answer

The Dowry Prohibition Act was enacted in 1961. This legislation aims to prevent the practice of giving or taking dowry.