First law of Thermodynamics

First law of Thermodynamics states that " Amount of heat changed in system is equal to sum of change in internal energy and workdone of a system". First law if Thermodynamics is also known as princ...

Energetics of Chemical reaction

Thermodynamic termsIn order to study the law of thermodynamics it is essential to understand certain terms used in thermodynamics. These terms have definite meaning. So, the most commonly used term...

Second Law of Thermodynamics

 A Qualitative approachThis approach is not an equational approach but rather a statement of impossibility. This includes 'Kelvin-Planck statement' and 'Clausius statement'.1) Kelvin-Planck Stateme...

NEB Grade 12 Physics model question with solution

Grade 12 Physics model Question and its Solution (New Syllabus)Group A: Multiple Choice Questions (11 × 1 =11)1. Which of the following is a correct formula for calculating the radius of gyration ...

Class 11 Physics Pre-Board Examination-2020 [St. Xavier's College]

Group A1.     Answer in brief, any six questions: [6x2=12]a.     Write the dimensional formula of the capacitance and the universal gas constant.b.    Why spinning top can erect at its apex where...

Entropy Change

Entropy change for a phase transformationThe phase transformation of a substance is carried out reversibly at constant temperature and fixed pressure generally at one atmosphere. The entropy chang...

Thermal equilibrium and zeroth law.

#Thermal equilibriumIf two bodies at two different temperatures are kept in thermal contact, flow of heat start from a body at higher temperature to another body at lower temperature and it conti...