RRB NTPC 2020 PYQs

Question 1

Buying or selling goods electronically is known as:

Accepted Answer

E-commerce specifically refers to the buying and selling of goods and services over electronic networks, primarily the internet. It's a direct definition.

Question 2

In the domain of computers and the internet, what is the full form of URL?

Accepted Answer

URL stands for Uniform Resource Locator. It is the address of a given unique resource on the World Wide Web, like a webpage or file.

Question 3

Ina certain code language, MAHARAJA is written as ZNUNENWN. How will RAINDROP be coded as in that language?

Accepted Answer

The pattern is: M(+13)Z, A(+13)N, H(+13)U, A(+13)N, R(+13)E, A(+13)N, J(+13)W, A(+13)N. Each letter is shifted +13 positions. Applying this to RAINDROP gives ENVAQEBC.

Question 4

The mean of 150 items was found to be 45. If at the time of calculation, two items were wrongly taken as 83 and 76 instead of 38 and 46, then the correct mean is:

Accepted Answer

Calculate the incorrect sum (150*45). Adjust by subtracting wrong values (83+76) and adding correct values (38+46). Divide the new sum by 150 to get the correct mean.

Question 5

ISRO created history by launching______ in Feb, 2017

Accepted Answer

ISRO successfully launched 104 satellites on February 15, 2017, using the PSLV-C37 rocket, setting a new world record for the most satellites launched in a single mission.

Question 6

'Obey' is related to 'Disobey' in the same way as 'Appoint' is related to '_______'.

Accepted Answer

The relationship between 'Obey' and 'Disobey' is that they are antonyms. Similarly, the antonym of 'Appoint' (to assign a job) is 'Dismiss' (to remove from a job).

Question 7

The sum of two positive numbers is 384 and their HCF is 24. How many pairs of such numbers can be formed?

Accepted Answer

Let the numbers be 24a and 24b, where a and b are coprime. Their sum is 24(a+b) = 384, so a+b = 16. Find coprime pairs (a,b) that sum to 16: (1,15), (3,13), (5,11), (7,9). There are 4 such pairs.

Question 8

Select the option that is related to the third letter cluster in the same way as the second letter cluster is related to the first letter cluster.RAMO : SCPS :: VXMJ : ?

Accepted Answer

The pattern is +1, +2, +3, +4 for each letter. R+1=S, A+2=C, M+3=P, O+4=S. Applying this to VXMJ: V+1=W, X+2=Z, M+3=P, J+4=N. So, the answer is WZPN.

Question 9

Solve the following:‌12×‌23−‌34(‌12×‌13+‌56)×‌421=?

Accepted Answer

Follow BODMAS. First, solve inside the parenthesis: (1/6 + 5/6) = 1. Then multiply and subtract: 1/3 - 3/4 * 1 * 4/21 = 1/3 - 1/7 = 4/21.

Question 10

A sum of money amounts to Rs. 12,100 in 2 years and Rs. 13,310 in 3 years, when compounded annually. Find the rate of interest.

Accepted Answer

The difference between amounts for consecutive years is the interest for that year. Interest for 3rd year = 13310 - 12100 = 1210. Rate = (1210/12100) * 100 = 10%.

Question 11

In a circle with a radius of 10 cm. XY and PQ are two parallel chords 12 cm and 16 cm in length, respectively. The two chords are situated on the opposite sides of the centre. The distance between the chords is:

Accepted Answer

Use Pythagoras theorem. For chord XY, distance from center is sqrt(10^2 - 6^2) = 8 cm. For chord PQ, distance is sqrt(10^2 - 8^2) = 6 cm. Total distance = 8 + 6 = 14 cm.

Question 12

Value of cos 1° cos 2° cos 3° ........cos 179° is:

Accepted Answer

The product includes cos 90°. Since cos 90° = 0, the entire product becomes 0, as any number multiplied by zero is zero.

Question 13

The length, breadth and height of a cuboid are 27 cm, 18 cm and 21 cm respectively. How many cubes of side 3 cm can be cut from the cuboid?

Accepted Answer

Calculate the volume of the cuboid (L×B×H) and the volume of one cube (side³). Divide the cuboid's volume by the cube's volume to find the number of cubes.

Question 14

If a3- b3= 125, a2- b2= 25 and a + b = 5 then the value of a2+ ab + b2is:

Accepted Answer

Use the identity a³ - b³ = (a - b)(a² + ab + b²). Given a³ - b³ = 125. We need to find (a - b) first. From a² - b² = (a - b)(a + b), we have 25 = (a - b)(5), so a - b = 5. Substitute these values into the first identity: 125 = (5)(a² + ab + b²). Thus, a² + ab + b² = 125/5 = 25.

Question 15

ABC is an equilateral triangle. P, Q and R are the midpoints of sides AB, BC and AC respectively. The length of the side of the triangle is 4 cm. The area of triangle PQR is:

Accepted Answer

Triangle PQR is formed by joining the midpoints of equilateral triangle ABC. This means triangle PQR is also equilateral and its side length is half of ABC's side. Area of PQR = (√3/4) * (2)^2 = √3 cm².

Question 16

Ram is the brother of Shyam and Mahesh is the father of Ram. Jagat is the brother of Priya and Priya is the daughter of Shyam. How is Mahesh related to Jagat?

Accepted Answer

Ram and Shyam are brothers. Mahesh is Ram's father, so Mahesh is also Shyam's father. Priya is Shyam's daughter, and Jagat is Priya's brother. Thus, Jagat is Shyam's son. Therefore, Mahesh is Jagat's grandfather.

Question 17

In the given figure consisting of multiple shapes, which number is present only in one shape?

Accepted Answer

Examine each number in the figure. Number 4 is found only within the square, not overlapping with any other shape. Thus, 4 is the correct answer.

Question 18

The given chart gives interest rates offered on deposits by two banks A and B for a period of 5 years (1-5). What would be the difference in interest amount earned in year 3, if a person had deposited Rs. 23 lakhs at the begining of the year in bank B instead of in bank A?

Accepted Answer

From the chart, Bank B's interest rate in year 3 is 7.5% and Bank A's is 6%. The difference in rates is 1.5%. Calculate 1.5% of Rs. 23,00,000 to get Rs. 34,500.

Question 19

Who among the following was the youngest President of India?

Accepted Answer

Neelam Sanjiva Reddy became President at 64 years old, making him the youngest to hold the office. This is a direct factual recall question.

Question 20

Who fought the Battle of Plassey against the East India Company?

Accepted Answer

The Battle of Plassey in 1757 was fought between the British East India Company, led by Robert Clive, and the Nawab of Bengal, Siraj-ud-Daula.