# Today's Challenge

# From Physics

Suppose the potential energy between electron and proton at a distance r is given by . Use Bohr's theory to obtain energy levels of such a hypothetical atom.

# From Math

A quadratic equation has positive distinct roots reciprocal of each other. Which one of the following is correct

# From Chemistry

1.44 g of pure FeC

_{2}O_{4}was dissolved in dilute HCl and solution diluted to 100 mL. Find the volume of 0.01 M KMnO_{4}required to oxidise FeC_{2}O_{4}solution completely## Available courses

This training module covers a wide spectrum of disciplines in Modern Physics, and is based on the GATE examination requirements. Approximately 1000 questions are added to conform the syllabi. The questions are arranged under ten topics. Brief concepts with required mathematical formulae. A detailed answer for all questions are available.

GATE/UGCNET/CSIR training module in chemistry, Study notes, practice problems and discussions

One Year complete tutoring module for AIPMT examinations. This module has

- Detailed Study Notes
- Practice Exercise Questions with Solutions
- Previous Years' AIPMT Questions with Solutions
- Optional Web Class
- Model Test Papers

One Year complete tutoring module for JEE (Main & Advanced) examinations. This module has

- Detailed Study Notes in Mathematics Physics Chemistry
- Practice Exercise Questions with Solutions
- Previous Years' JEE (Main & Advanced) Questions with Solutions
- Optional Web Class
- Model Test Papers

Complete solution to NCERT based textbook

Available for Class X, Class XI and Class XII

Complete worked out solution for Previous Years Board Examination Papers

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