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RRB NTPC 2024 | RRB NTPC Maths | RRB NTPC Maths Previous Year Solved Paper | by Aditya Patel Sir

The WiNNERS Institute, Indore・42 minutes read

The session focuses on solving an old NTPC paper and studying math effectively, covering topics like number systems, geometry, trigonometry, and more. Practical details about studying methods, courses, and resources are provided to emphasize the importance of hard work now for a comfortable future.

Insights

  • Understanding key topics like number systems, LCM, HCF, and arithmetic chapters such as ratio, percentage, and interest is crucial for preparation for Railway exams and NTPC.
  • Memorizing trigonometry values, applying formulas accurately, and practicing basic concepts are essential strategies for effectively solving math questions and anticipating upcoming questions in exams.

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Recent questions

  • How can I effectively study math?

    Understanding question levels, key topics, and essential sections is crucial for effective math study. Focus on arithmetic chapters like ratio, percentage, simple interest, compound interest, time and work, and more. Memorize trigonometry values for quick calculations and practice solving questions on angles. Arrange numbers in ascending order to find the median and apply the rule that the middle number is the average. Remember that the product of two numbers and the product of their LCM and HCF are always equal. Dedicate sufficient time to studying without relying on shortcuts to succeed in competitive exams.

  • What topics are important for Railway exams?

    Key topics for Railway exams include number systems, LCM, HCF, mensuration, geometry, algebra, trigonometry, and more. Focus on arithmetic chapters like ratio, percentage, simple interest, compound interest, time and work, and others. Memorize trigonometry values like sin 30, sin 60, tan 30, and tan 60 for quick calculations. Practice solving questions on angles and understanding the rule of the median when arranging numbers in order. Ensure a thorough understanding of all material without skipping crucial information to succeed in competitive exams.

  • How do I calculate the area of a rhombus?

    To calculate the area of a rhombus with a given angle, apply the formula a * b * sin(theta). Ensure that the perimeters of the rectangle and rhombus are equal, with all sides of the rhombus being equal. By understanding the properties of a rhombus and applying the formula correctly, you can accurately determine the area of the rhombus based on the given angle. Practice different examples to strengthen your understanding of calculating the area of a rhombus in various scenarios.

  • What is the process for adjusting marks due to an error?

    When adjusting the mean of marks for 50 students due to an error in marking, redistribute the difference among all students. By ensuring that the total marks remain the same while correcting the error, each student's mark is adjusted accordingly. Calculate the difference in marks caused by the error and distribute this difference evenly among all students to rectify the mistake. Pay attention to maintaining the accuracy of the total marks and ensuring fairness in the adjustment process for all students involved.

  • How can I find the rate of simple interest?

    To find the rate of simple interest, divide the number of times the money triples in a year by 100. By understanding the relationship between the principal amount, interest rate, and time period, you can calculate the rate of simple interest effectively. Divide the number of times the money triples within a year by 100 to determine the rate at which the simple interest is applied. Practice different scenarios to enhance your ability to calculate the rate of simple interest accurately in various situations.

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Summary

00:00

Effective Math Study Tips for Railway Exams

  • The session will focus on solving an old NTPC paper and discussing how to study math effectively.
  • Emphasis will be placed on understanding question levels, chapters with more questions, and essential sections to remember.
  • The study of math will cover various aspects, including insights from previous papers to anticipate upcoming questions.
  • Key topics for Railway exams and NTPC include number systems, LCM, HCF, mensuration, geometry, algebra, trigonometry, and more.
  • Arithmetic chapters like ratio, percentage, simple interest, compound interest, time and work, and others are crucial for preparation.
  • Converting a rectangle into a rhombus involves maintaining equal perimeters, with all sides of the rhombus being equal.
  • Calculating the area of a rhombus with a given angle involves applying the formula a * b * sin(theta).
  • Adjusting the mean of marks for 50 students due to an error in marking involves redistributing the difference among all students.
  • Calculating the time taken for two trains of different lengths and speeds running in opposite directions to cross each other involves using relative speed.
  • Studying statistics topics like the median is essential, requiring arranging numbers in ascending order to determine the middle value.

14:18

Mathematical Concepts and Calculations Explained

  • The rule of the median states that the middle number is taken as the average when numbers are arranged in order.
  • If two numbers are the same, their median will also be the same, as seen with the example of 153.
  • The product of two numbers and the product of their LCM and HCF are always equal.
  • By assigning one number as 7x and the other as 9x based on their ratio, the LCM and HCF product can be calculated.
  • The square of 400 is 20, and the sum of two numbers can be found by adding them.
  • Memorizing trigonometry values like sin 30, sin 60, tan 30, and tan 60 is crucial for quick calculations.
  • The sum of three consecutive natural numbers totaling 120 can be solved by dividing the sum by three to find the middle number.
  • To find the rate of simple interest, dividing the number of times the money triples in a year by 100 gives the rate.
  • When a train crosses a canal, the length of the train and the canal are added to find the speed of the train.
  • The curved surface area of a cylinder can be calculated using the formula 2πrh, with radius and height values given.

29:21

"Ratio Increase, Trigonometry, HCF, Batch Applications"

  • The new ratio increased by two for each class, with a total of 30 children causing this change.
  • The value of one child's ratio is 15 after the increase.
  • The total number of students after the increase is 240.
  • The number of children before the increase was 150.
  • The batch of Railways, Foundation, and NTPC is available for application.
  • A special batch for NTPC with low fees is coming soon.
  • A trigonometry formula is discussed, leading to solving questions on angles.
  • Basic concepts are emphasized for solving questions effectively.
  • Compound interest calculations are explained with examples.
  • The concept of Highest Common Factor (HCF) is used to determine the minimum number of trees to be planted in rows.

45:38

Study thoroughly for future success.

  • Experienced individuals emphasize the importance of thoroughly studying all material without skipping any crucial information to succeed in today's competitive environment.
  • It is crucial to not rely on shortcuts or carelessness in studying, but rather to follow the advice of experienced individuals who have achieved success through years of experience.
  • The value of hard work in the present is highlighted, as it determines whether one will face regrets or achieve results in the future.
  • The choice between working hard now for a comfortable future or relaxing now and facing laborious work later is presented, emphasizing the importance of dedicating sufficient study time to avoid future regrets.
  • Practical details about studying methods, courses, and resources are provided, including information on available offline and online courses, study materials, and upcoming study sessions.
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