RRB NTPC 2021 PYQs

Question 1

Which instrument is used to show the direction of flow of current in a circuit?

Accepted Answer

A galvanometer is specifically designed to detect the presence and direction of small electric currents in a circuit. It shows deflection based on current flow.

Question 2

If the amount in a bill is decreased by 10%, then Rs. 279 is to be paid. How much is the original bill?

Accepted Answer

If the bill is decreased by 10%, it means 90% of the original bill is Rs. 279. So, the original bill is (279 / 90) * 100 = Rs. 310.

Question 3

In which of the following does the river Godavari originate?

Accepted Answer

The Godavari River, one of India's longest rivers, originates from the Thriambak hills, also known as Bramhagiri hills, near Nashik in Maharashtra.

Question 4

Who founded the Muhammdan Anglo-Oriental college in 1875 which later became Aligarh Muslim University?

Accepted Answer

Sir Syed Ahmed Khan founded the Muhammdan Anglo-Oriental College in 1875, which evolved into Aligarh Muslim University, a key institution for Muslim education.

Question 5

A students required 20% marks to pass in psychology. He/ She secured 10% marks and failed by 20 marks. what is the passing marks?

Accepted Answer

The student failed by 20 marks, which represents the difference between 20% (passing) and 10% (secured). So, 10% of total marks is 20. Thus, 20% (passing marks) is 40.

Question 6

The average weight of A, B, C, and D is 56 kg. If the average weight of A, B, and C is 52 kg and that of C and D is 48 kg. then the weight of C is:

Accepted Answer

Total weight of A, B, C, D is 56*4 = 224 kg. Total weight of A, B, C is 52*3 = 156 kg. Total weight of C, D is 48*2 = 96 kg. C = (A+B+C) + (C+D) - (A+B+C+D) = 156 + 96 - 224 = 28 kg.

Question 7

In a competitive examination 1 mark is awarded for a correct answer, 0 marks for an unattempt question and‌12mark is deducted for every wrong answer. Ambika answered 120 questions and got 90 marks. How many answers were correct?

Accepted Answer

Let C be correct answers and W be wrong answers. C + W = 120. Marks = C - 0.5W = 90. Solving these two equations gives C = 100 and W = 20.

Question 8

Which of the following is the process of converting sugar into alcohol?

Accepted Answer

Fermentation is a metabolic process where microorganisms convert sugar into alcohol and carbon dioxide in the absence of oxygen. This is a fundamental biological process.

Question 9

_______ is India's first female para-athlete to win a medal at the Paralympics. She won Silver at Rio 2016 Paralympic Games in the shot put event.

Accepted Answer

Deepa Malik is India's first female para-athlete to win a Paralympic medal, securing silver in shot put at Rio 2016. This is a direct factual recall question.

Question 10

Which one of the following scholars coined the term- Geography?

Accepted Answer

Eratosthenes, an ancient Greek scholar, is credited with coining the term 'Geography' and is often considered the 'Father of Geography'.

Question 11

If the degree of polynomial 9 x5y2zris 15, then r = ?

Accepted Answer

The degree of a polynomial is the sum of the exponents of its variables. Here, 5 + 2 + r = 15. Solving for r gives r = 15 - 7 = 8.

Question 12

What will be the volume of a cube whose total surface area is 1944 cm2?

Accepted Answer

Total surface area of a cube is 6a². Given 6a² = 1944, so a² = 324, which means a = 18 cm. Volume of cube is a³, so 18³ = 5832 cm³.

Question 13

Five students are sitting in a circle facing the center. Sumit is between Sunil and Sushmit. Sushma is on the left side of Shweta, Sushmit and Sushma are not sitting next to each other. Who is sitting next to Sumit on his right side?

Accepted Answer

Place Sumit between Sunil and Sushmit. Since Sushmit and Sushma are not together, and Sushma is left of Shweta, the arrangement is Sunil-Sumit-Sushmit-Shweta-Sushma. Sunil is to Sumit's right.

Question 14

If A is the father of B and B is the father of C, then how is C related to A?

Accepted Answer

A is B's father, and B is C's father. This means A is C's grandfather. Therefore, C is A's grandchild, as gender is not specified.

Question 15

The value of1÷{‌12+‌13+‌16÷(‌34−‌13).

Accepted Answer

First, solve the innermost parenthesis: (3/4 - 1/3) = 5/12. Then, 1/6 ÷ 5/12 = 2/5. Add 1/2 + 1/3 + 2/5 = 37/30. Finally, 1 ÷ 37/30 = 30/37.

Question 16

Name the first student satellite built by Indian high school student team and launched by NASA.

Accepted Answer

Kalamsat was the first student satellite built by Indian high school students and launched by NASA. It was a significant achievement in space education.

Question 17

Three traffic signals change at intervals of 48, 72 and 108 seconds respectively. They start changing simultaneously at 8:20:00 hours for the first time. At what time will they change again simultaneously?

Accepted Answer

Find the LCM of 48, 72, and 108 seconds. LCM is 432 seconds. Convert 432 seconds to minutes and seconds (7 minutes 12 seconds). Add this to the initial time 8:20:00.

Question 18

During which financial year was Jal Kranti Abhiyan launched by the Government of India?

Accepted Answer

The Jal Kranti Abhiyan was launched by the Government of India in 2015-16 to ensure water security through a holistic approach.

Question 19

An E-Way Bill is related with which of the following?

Accepted Answer

An E-Way Bill is an electronic document required for the movement of goods worth more than a specified amount, ensuring compliance with GST regulations.

Question 20

In Pradhan Mantri Gramin DISHA (PMGDISHA) Programme, DISHA stands for:

Accepted Answer

PMGDISHA stands for Pradhan Mantri Gramin Digital Saksharta Abhiyan. Therefore, DISHA refers to Digital Saksharta Abhiyan.