RRB NTPC 2021 PYQs

Question 1

If A is equal to 1, M is equal to 13 and R is equal 18, how would you spell MISSION?

Accepted Answer

Each letter is coded by its alphabetical position. M=13, I=9, S=19, S=19, I=9, O=15, N=14. Combining these gives 139191991514.

Question 2

Which of the following rivers is NOT in Africa?

Accepted Answer

The Amazon River is located in South America. The Orange, Niger, and Nile rivers are all major rivers in Africa.

Question 3

The inner lining of the small intestine has numerous finger like projections that are called:

Accepted Answer

The small intestine's inner lining has finger-like projections called villi. These structures increase the surface area for efficient nutrient absorption into the bloodstream.

Question 4

In a code language, TYPEWRITTERS is written as PETYRWTEITSR. How will BRAINSTORMER be written in that language?

Accepted Answer

The word is divided into blocks of four letters, and each block is reversed. TYPE becomes PETY, WRIT becomes TIRW, TERS becomes SRET. Applying this to BRAINSTORMER, we get AIBR, SNIA, MROT, RMEE.

Question 5

Six people - Raj, Shruti, Priya, Mohan, Ajit and Geet - are sitting around a circular table facing inside. Mohan is second from Priya's right and Priya is third from Raj's left. Ajit is second from Mohan's right and Geet is not Mohan's neighbour. Who is fourth to the right of Geet?

Accepted Answer

Place Priya, then Mohan (Priya's 2nd right). Place Raj (Priya is Raj's 3rd left). Place Ajit (Mohan's 2nd right). Geet is not Mohan's neighbor, so place Geet and Shruti. Geet's 4th right is Raj.

Question 6

A number is first decreased by 5% and then increased by 5%. What will be the net increase or decrease?

Accepted Answer

Use the formula for successive percentage changes: (x + y + xy/100)%. Here, x = -5% and y = +5%. This gives (-5 + 5 + (-5*5)/100)% = -0.25%.

Question 7

If '+' denotes 'multiplication', '-', denotes 'addition', '×', denotes 'division' and '÷' denotes 'subtraction', then which of the following equation is true?

Accepted Answer

Substitute the given symbols into each equation and apply the BODMAS rule. Option 3 becomes 10 + 12 - 18 ÷ 6 × 2 = 10 + 12 - 3 × 2 = 10 + 12 - 6 = 16, which is true.

Question 8

As per Inland Waterways Authority of India, what is the approximate total length of navigable Inland waterways of India?

Accepted Answer

The Inland Waterways Authority of India (IWAI) states that India has approximately 14,500 km of navigable waterways, including rivers, canals, backwaters, etc.

Question 9

In the given figure, ∠ABD = 550and ∠ACD = 300, If ∠BAC = y0 and non-relax ∠BDC = x0, then what is the value of x-y?

Accepted Answer

Angles in the same segment are equal. So, ∠BAC = ∠BDC (y=x). Also, ∠DBC = ∠DAC. In ΔABC, ∠BAC = ∠ABD - ∠ACD = 55° - 30° = 25°. Thus, y = 25°. Since x = y, x = 25°. Therefore, x - y = 0.

Question 10

What is the momentum of an object having mass of 14 kg and velocity 28 m/s?

Accepted Answer

Momentum (p) is calculated as mass (m) times velocity (v). So, p = 14 kg * 28 m/s = 392 kg-m/s.

Question 11

If A's height is 25% less than that of B, then approximately by how much percentage is B's height more than that of A?

Accepted Answer

Assume B's height is 100 units. A's height is 25% less, so A = 75 units. B's height is (100-75)/75 * 100 = 33.33% more than A's.

Question 12

Select the letter-cluster that can replace the question mark (?) in the following series.AYD, BVF, CSH, ?

Accepted Answer

The first letters are A, B, C, so the next is D. The second letters are Y, V, S (decreasing by 3). So, the next is P. The third letters are D, F, H (increasing by 2). So, the next is J. Thus, the answer is DPJ.

Question 13

The diameter of circle whose perimeter is 8.8 cm is ________.(π‌=‌‌227)

Accepted Answer

The perimeter (circumference) of a circle is 2πr. Given perimeter is 8.8 cm, so 2 * (22/7) * r = 8.8. Solving for r gives r = 1.4 cm. The diameter is 2r, which is 2 * 1.4 = 2.8 cm.

Question 14

In Δ ABC, ∠A : ∠B :∠C = 2 : 3 : 5, then find the measure of the supplementary angle of ∠A.

Accepted Answer

The sum of angles in a triangle is 180°. Given ratio 2:3:5, ∠A = (2/10)*180° = 36°. The supplementary angle of ∠A is 180° - 36° = 144°.

Question 15

A tank has two inlets, A and B, which can fill it in 15 hours and 20 hours, respectively. An outlet C can empty the full tank in 12 hours. If A, B and C are opened together when the tank is empty, then in how much time will the tank be filled?

Accepted Answer

Calculate the combined filling rate (1/15 + 1/20 - 1/12) which is 1/30. Therefore, the tank will be filled in 30 hours.

Question 16

27% of 250 - 0.02% of 1000 is equal to:

Accepted Answer

Calculate 27% of 250 as (27/100)*250 = 67.5. Calculate 0.02% of 1000 as (0.02/100)*1000 = 0.2. Subtract 0.2 from 67.5 to get 67.3.

Question 17

Where is the headquarters of UNICEF situated?

Accepted Answer

UNICEF, the United Nations Children's Fund, has its global headquarters located in New York City, USA. This is a direct factual recall question.

Question 18

Select the Venn diagram that best represents the relationship between the given set of classes.Apple, Mango, Fruits

Accepted Answer

Both Apple and Mango are types of Fruits. Therefore, two separate circles for Apple and Mango should be entirely contained within a larger circle representing Fruits.

Question 19

A man bought 2 articles for Rs. 3,000 each. He sold one article at 10% profit and another at 5% profit. Find the total percentage profit he earned.

Accepted Answer

Calculate profit on each article: 10% of 3000 = 300, 5% of 3000 = 150. Total profit = 450. Total cost = 6000. Percentage profit = (450/6000) * 100 = 7.5%.

Question 20

A rectangular field is 16 meters long and 12 meters wide. A barbed fence has to be drawn on three sides of the field leaving one side open along the width. What is the cost of fencing at the rate of 25 paise per cm?

Accepted Answer

The fence covers two lengths and one width: (16+16+12)m = 44m. Convert to cm: 4400 cm. Cost = 4400 cm * 0.25 Rs/cm = Rs. 1100.