This test paper based on the topic Electric charges and field,(chapter -1 CBSE ). This test paper contains objective, assertion-reason ,case study based questions also, provided by Physics classes by Nayan jha. PHYSICS CLASSES BY NAYAN JHA Test class 12th 1.Two small identical sphere having charges +10μC attract each other with a force of […]
Important numericals physics term-2 (CBSE) What is apparent position of the object below a rectangular block of glass 6cm thick , if a layer of water 4cm thick is on the top of the glass ? Refractive index of glass and water with respect to air is 3/2 and 4/3 respectively. A screen is placed […]
Sample paper -1 Class 12th Physics (Theory) Term-2 M.M: 35 TIME-2Hrs Here Physics classes by Nayan jha providing CBSE Term-2 Physics sample paper . There are 12 questions in all and all questions are compulsory. This question paper consists of three section A,B and C. SECTION A has three questions of two […]
Photoelectric effect Photoelectric effect is the phenomenon of emission of electrons from a metal surface , when radiation of suitable frequency fall on them . The emitted electrons are called photoelectrons and the current so produced is called photoelectric current. i. With the increase of intensity of incident radiation on photoelectrons emitted by a photo […]
Hots questions based on Semi conductors. These questions are important for class 12th board Examination. Q. 1. What are different types of compound semiconductors? Give two examples of each. Ans- The compound semiconductors are of following types Inorganic semiconductors: Cds, GaAs, CdSe Organic semiconductors: Anthracene, pthalocynines Organic polymers: Polyparrole, polyaniline, polythiophene. Q. 2. Which characteristic […]
Compound microscope- A compound microscope is an optical instrument used for observing high magnified image of tiny objects. Magnifying power of compound microscope is defined as the ratio of the angle subtended at the eye by the final image to the angle subtended by the object , when both the final image and object at […]
Astronomical telescope- An astronomical telescope is an optical instrument which is used for observing distinct images of heavenly bodies libe stars, planets etc. It consists of two lenses . In normal adjustment of telescope , the final image is formed at infinity . Magnifying power of astronomical telescope in normal adjustment is defined as the […]
Case study based questions- 1. Total internal reflection – Total internal reflection is the phenomenon of reflection of light into denser medium at the interface of denser medium with rarer medium . For this phenomenon to occur necessary condition is that light must move from denser to rarer and angle of incidence in denser medium […]
Short answer type questions- (2 marks), This assignment provides Very important short answer type questions of ray optics which is very important for the class 12th board examinations. 1.What are the necessary conditions for the phenomenon of total internal reflection to occur . Also write the relation between refractive index and critical angle for a […]
Magnus effect and dynamic lift- The upward force experience by a body when it moves through a fluid is called dynamic lift . Such a lift is felt by airfoil , aircraft win etc. Couse behind it can be explained by Bernoulli’s theorem . It also explain why a spinning ball is deviated from its […]