RRB NTPC 2020 PYQs

Question 1

Which of the following human diseases is caused by bacteria?

Accepted Answer

Typhoid is a bacterial infection caused by Salmonella Typhi. The other options, Hepatitis A, Measles, and Polio, are all viral diseases.

Question 2

Which of the following is NOT classified under Kingdom Animalia?

Accepted Answer

Protozoa are single-celled eukaryotes, historically grouped as animals but now classified under Kingdom Protista. Metazoa, Choanozoa, and Pipiens (a genus of frog) are all part of Kingdom Animalia.

Question 3

Which is the highest literate state of India as per Census 2011?

Accepted Answer

As per Census 2011, Kerala has the highest literacy rate among all Indian states, making it the most literate state.

Question 4

Ifsin‌⁡θ=‌35andcos⁡θ=‌45, then the value of‌1‌+‌tan‌⁡θ‌1−cot‌⁡θ‌is:

Accepted Answer

First, calculate tanθ = sinθ/cosθ = (3/5)/(4/5) = 3/4 and cotθ = 1/tanθ = 4/3. Substitute these values into the expression and simplify to get the result.

Question 5

If P = 0.3 × 0.3 + 0.03 × 0.03 - 0.6 × 0.03 and Q = 0.54, then‌PQis equal to:

Accepted Answer

Recognize P as (a-b)^2 where a=0.3 and b=0.03. So P = (0.3 - 0.03)^2 = (0.27)^2 = 0.0729. Then, PQ = 0.0729 * 0.54 = 0.039366. The closest option is 0.135, which is incorrect. Let's recheck. P = (0.3 - 0.03)^2 = (0.27)^2 = 0.0729. The question asks for P/Q, not PQ. So P/Q = 0.0729 / 0.54 = 0.135. The question asks for PQ, not P/Q. Let's recheck the question. It asks for PQ. So P = 0.0729. Q = 0.54. PQ = 0.0729 * 0.54 = 0.039366. There seems to be a mismatch between the provided correct answer and the calculation for PQ. Assuming the question meant P/Q, then P/Q = 0.0729 / 0.54 = 0.135. Given the correct answer is 3 (0.135), the question likely intended P/Q.

Question 6

The focus of World Environment Day, 2018 was on _______

Accepted Answer

World Environment Day 2018 focused on 'Beat Plastic Pollution'. This theme aimed to encourage people to reduce single-use plastic.

Question 7

Who was the chief guest at the Republic Day celebrations of India in 2020?

Accepted Answer

Jair Bolsonaro, the then President of Brazil, was the chief guest at India's Republic Day celebrations in 2020. This is a direct factual recall question.

Question 8

By selling an article for Rs.138, a shopkeeper losses 8%. At what price should the article be sold to get a gain of 4%?

Accepted Answer

If 138 represents 92% (100-8%) of the cost price, then 1% is 138/92. To gain 4%, calculate 104% of the cost price: (138/92) * 104 = 1.5 * 104 = 156.

Question 9

In a certain code language, ACCESS is written as 13351919. How will EXCELLENCE be coded as in that language?

Accepted Answer

Each letter is replaced by its alphabetical position. A=1, C=3, E=5, S=19. Apply this rule to EXCELLENCE: E=5, X=24, C=3, E=5, L=12, L=12, E=5, N=14, C=3, E=5.

Question 10

In certain code language, LEADER is written as ELDARE How will FOUNTAIN be written as in that code language?

Accepted Answer

The pattern involves swapping adjacent letters in pairs. LEADER becomes ELDARE (LE->EL, AD->DA, ER->RE). Applying this to FOUNTAIN: FO->OF, UN->NU, TA->AT, IN->NI. Thus, FOUNTAIN becomes OFNUATNI.

Question 11

The conclusion that follows from the premises 'All voters are citizens' and 'All citizens are loyalists' is:

Accepted Answer

This is a direct syllogism. If all voters are citizens, and all citizens are loyalists, then it logically follows that all voters must also be loyalists.

Question 12

In a certain code, P is coded as 17 and TMR is coded as 54. How will NARESH be written as in that code?

Accepted Answer

The code assigns a value based on the alphabetical position plus one. P is 16+1=17. TMR is (20+1)+(13+1)+(18+1) = 21+14+19=54. So, NARESH is (14+1)+(1+1)+(18+1)+(5+1)+(19+1)+(8+1) = 15+2+19+6+20+9 = 71.

Question 13

Shanti’s daughter Chandini is married to Abhi. Anchal is married to Sandy, the grandson of Shanti. Abhi's grandson is Karan. Rashmi is the mother of Karan. Shaurya is Anchal's son. How is Shaurya related to Karan?

Accepted Answer

Shanti's daughter Chandini is married to Abhi. Sandy is Shanti's grandson, married to Anchal. Karan is Abhi's grandson. Shaurya is Anchal's son. Thus, Shaurya and Karan are cousins.

Question 14

If 'p + q' implies 'p - q', 'p - q' implies 'p × q', 'p × q' implies 'p ÷ q' and 'p ÷ q' implies 'p + q', then find the value of 25 + 48 × 6 ÷ 12 - 2.

Accepted Answer

Substitute the given symbols: + becomes -, × becomes ÷, ÷ becomes +, - becomes ×. The expression becomes 25 - 48 ÷ 6 + 12 × 2. Following BODMAS, calculate 25 - 8 + 24 = 41.

Question 15

Four letter-clusters have been given, out of which three are alike in some manner and one is different. Select the odd one.

Accepted Answer

In options 1, 2, and 3, the first two letters are consecutive and in reverse alphabetical order (H-G, F-E, B-A). The last two letters are also consecutive and in reverse alphabetical order (S-T, U-V, Y-Z). Option 4 (DCWV) breaks this pattern as C-W are not consecutive.

Question 16

'Little knowledge is a dangerous thing' is a decision based on:

Accepted Answer

The proverb 'Little knowledge is a dangerous thing' means that having incomplete information can lead to harmful outcomes. Option 4 directly reflects this meaning.

Question 17

If the letters of the word ADISNHPANRKARFACHTARKYAR were written in reverse order, then which would be the third letter to the right of the ninth letter from the left?

Accepted Answer

Reverse the word to RAYKRATHCAFRANKAPHSINDA. The ninth letter from the left is 'A'. The third letter to its right is 'R'.

Question 18

P is the brother of Q and R. S is R’s mother. T is P’s father. Which of the following statements CANNOT be definitely true?

Accepted Answer

P, Q, R are siblings. S is R's mother, so S is also P's and Q's mother. T is P's father. Thus, T is the father of P, Q, R and husband of S. T cannot be Q's husband.

Question 19

Select the numbers from among the given options that can replace the question mark (?) in the following series.4, 11, 30, 67, 128, ?

Accepted Answer

The pattern is n³ + 3. For n=1, 1³+3=4; for n=2, 2³+3=11; for n=3, 3³+3=30; for n=4, 4³+3=67; for n=5, 5³+3=128. So for n=6, 6³+3 = 216+3 = 219.

Question 20

In the given Venn diagram, assuming that the shaded areas do not exist, determine which conclusion can be validity drawn?

Accepted Answer

The Venn diagram shows an overlap between billionaires and cartoonists, indicating that some individuals belong to both categories. This directly supports the conclusion that some billionaires are cartoonists.