Kitab Nagri

Propagation of Sound Waves   When a body vibrates in air, it produces longitudinal waves by compressions and rarefactions. These compressions and rarefactions are traveled by the particles of the medium and transferred into the next particles. Due to this transference, sound propagates in a medium.   Experiment: Suspend an electric bell in a jar…

Definition of Sound in Physics   A vibration transmitted by air or other medium in the form of alternate compressions and rare factions of the medium is known as Sound.     Production of Sound:   Sound is produced by a vibrating body like a drum, bell, etc, when a body vibrates.   Fantasy books…

Wave Motion in Physics   Wave motion is a form of disturbance, which travels through a medium due to periodic motion of particles of the medium about their mean position.   Experiment   We see that if we dip a pencil mm a top of water and take it out a pronounced circular ripple is…

What is a Wave in Physics   A method of energy transfer involving some form of vibration is known as a wave.   Everyone knows that English has long been considered the most popular medium in international communication, and its knowledge provides many advantages at a professional level. You can learn it on your own,…

Lahore Board Urdu Notes   We are going to share with you the notes for different classes as mention above just for the help of our students, so that they can perform best in exams and in the near future, they can become good citizen of our society and take part in the development of…

Law of Heat Exchange in Physics   For an isolated system comprising mixture of hot and cold substances, the heat lost by hot substances is equal to the heat gained by cold substances.   Heat lost by hot body = Heat gained by cold body   Refrigerator:   Introduction:   A refrigerator is a device…

Bi-metal Thermometer   A bi-metal thermometer is made of a bi-metallic coil. No liquid is used in such Type of Thermometer.   Construction:   It consists of a bi-metallic strip in the form of along spiral. One end of the spiral is kept fixed, while a light pointer is attached to the other end.  …

Three Methods of Heat Transfer   There are three methods of transferring heat from one place into another.   Conduction   Conduction is a mode of heat transfer by atomic or molecular collisions, without the movement of a bulk of a substance from one position to another, in a body. It mostly occurs in solids.…

Thermometer and its Types   The instrument that is used to measure temperature is called a thermometer.   Types of Thermometer   Ordinary Liquid-in-Glass Thermometer   An ordinary liquid-in-glass Thermometer is used in a laboratory to measure Temperature within a range of -10C To 110C.   Construction:   It consists of a glass stem with…

Business Taxation Notes For B.Com Part 2 pdf We are going to share with you the notes for different classes as mention above just for the help of our students, so that they can perform best in exams and in the near future, they can become good citizen of our society and take part in…