RRB NTPC 2020 PYQs

Question 1

The maximum resistance which can be made by using four resistors each of 1/4 in series is ____

Accepted Answer

For maximum resistance, resistors are connected in series. The total resistance is the sum of individual resistances: R_total = R1 + R2 + R3 + R4 = 1/4 + 1/4 + 1/4 + 1/4 = 1 Ohm.

Question 2

If mean is 40 and standard deviation is 5 then C.V (Coefficient of variation) is:

Accepted Answer

Coefficient of Variation (C.V.) is calculated as (Standard Deviation / Mean) * 100. Substitute the given values: (5 / 40) * 100 = 12.5%.

Question 3

Anil Kumar took a loan of 24,000 with simple interest for as many years as the rate of interest. If he paid Rs.19,440 as interest at the end of the loan period, what was the rate of interest?

Accepted Answer

Let rate R and time T be equal. Use SI = (P * R * T) / 100. Substitute SI=19440, P=24000, T=R. Solve for R, which gives R^2 = 81, so R=9%.

Question 4

Which of the following is in the list of Maharatna Central Public Sector Enterprises?

Accepted Answer

Coal India Limited is one of the Maharatna Central Public Sector Enterprises. This is a direct factual recall question about the status of PSUs.

Question 5

The Tri-Color which was hoisted in Stuttgart by Madam Cama was smuggled into British India by:

Accepted Answer

Indulal Yagnik smuggled the flag hoisted by Madam Cama in Stuttgart into British India. This was a significant act of defiance against British rule.

Question 6

Name the female wrestler recommended by the Wrestling Federation of India for the prestigious 2020 Rajiv Gandhi Khel Ratna Award.

Accepted Answer

Vinesh Phogat was recommended by the Wrestling Federation of India for the 2020 Rajiv Gandhi Khel Ratna Award, which she subsequently received.

Question 7

The value of 200 ÷ (5.23 + 4.77) ×(3∕5−2∕10)+ (5 – 2) is:

Accepted Answer

First, simplify parentheses: (5.23 + 4.77) = 10 and (3/5 - 2/10) = (6/10 - 2/10) = 4/10 = 2/5. Also, (5-2)=3. Then, 200 ÷ 10 × 2/5 + 3 = 20 × 2/5 + 3 = 8 + 3 = 11.

Question 8

Which of the following is a metalloid?

Accepted Answer

Metalloids exhibit properties of both metals and non-metals. Silicon is a classic example, widely used in semiconductors due to its unique electrical properties.

Question 9

A man walks around a circular pond exactly once. If his step is 44 cm long and he takes 700 steps to go around the pond, find the area of the pond.

Accepted Answer

Calculate the pond's circumference (700 steps * 44 cm). Convert to meters. Use circumference (2πr) to find the radius, then calculate the area (πr²) in m².

Question 10

Which of the following units is used for measuring the amount of a substance?

Accepted Answer

The mole is the SI unit for measuring the amount of a substance, representing Avogadro's number of particles.

Question 11

What does NIU stand for in information technology?

Accepted Answer

NIU is a common acronym in information technology. It stands for Network Interface Unit, which is a device connecting a user's equipment to a network.

Question 12

Which of the following is the highest peak in India?

Accepted Answer

Kanchenjunga, located in the Himalayas, is the highest peak entirely within India. It is the third highest mountain in the world.

Question 13

Jim Corbett National Park is located in _______

Accepted Answer

Jim Corbett National Park, India's oldest national park, is famously located in the state of Uttarakhand. It is known for its tiger conservation efforts.

Question 14

Who was the Viceroy when the Royal Commission on Civil Services was formed in 1912?

Accepted Answer

The Royal Commission on Civil Services was formed in 1912. Lord Hardinge served as the Viceroy of India from 1910 to 1916, making him the Viceroy during this period.

Question 15

If 15 × 17 = 84, 92 × 23 = 57, 37 × 44 = 84, then 54 × 32 = ?

Accepted Answer

The pattern is to sum the digits of each number and then multiply the results. For 54 × 32, (5+4) × (3+2) = 9 × 5 = 45. The given answer 51 is incorrect based on this pattern. Assuming the correct answer should be 45.

Question 16

The unit digit in 4 × 38 × 764 × 1256 is:

Accepted Answer

To find the unit digit, multiply only the unit digits of each number: 4 × 8 × 4 × 6. This gives 32 × 24. The unit digit of 2 × 4 is 8.

Question 17

Read the given statements and conclusions (options) carefully. Assuming that the information given in the statements is true, even if it appears to be at variance with commonly known facts, decide from the options given which conclusion logically follows from the statements.Statements:1. No pilots are amateurs.2. Only a few amateurs are players.

Accepted Answer

From statement 2, 'Only a few amateurs are players' implies that 'Some amateurs are players' and 'Some amateurs are not players'. Thus, conclusion 3 directly follows.

Question 18

Name India's first Superfast train.

Accepted Answer

The Deccan Queen, inaugurated in 1930, holds the distinction of being India's first superfast train, connecting Mumbai and Pune.

Question 19

Five children A, B, C, D and E are standing in a row facing north. D has B on his left, B and C are always together (Next to each other) and C is at one end of the row. D cannot be at the fourth or fifth place, E is to the right of A. Who is standing in the middle of the row?

Accepted Answer

C is at an end, and B is next to C. D is to B's left. D cannot be 4th/5th. E is right of A. This places the arrangement as A E D B C. D is in the middle.

Question 20

A metallic part of a machine is made from a mixture of copper, zinc and lead mixed in the ratio of 13 : 6 : 1. If the weight of zinc in this part is 90 kg, then the total weight of the part will be:

Accepted Answer

The ratio of copper, zinc, and lead is 13:6:1. Zinc's ratio part is 6, which equals 90 kg. So, 1 ratio unit = 90/6 = 15 kg. Total ratio parts = 13+6+1 = 20. Total weight = 20 * 15 = 300 kg.