Saturday, 26 November 2011
XII -A16: 10 MARKS QUESTIONS FROM VOLUME 2 ( 2011-2012):
XII -A16: 10 MARKS QUESTIONS FROM VOLUME 2 ( 2011-2012):: 6TH LESSON: DETERMINATION OF SPECIFIC CHARGE OF AN ELECTRON- J.J.THOMSON'S METHOD RADIUS OF nth ORBIT,INCLUDING TWO POSTULATES ( PAGE 14...
5 MARKS FROM VOLUME-1 ( 2011 - 2012 )
LESSON-1
* PRINCIPLE OF SUPER POSITION
* ELECTRIC POTENTIAL ENERGY OF AN ELECTRIC DIPOLE IN AN ELECTRIC FIELD
* ELECTRIC FIELD DUE TO TWO PARALLEL CHARGED SHEETS
* CAPACITANCE OF A PARALLEL PLATE CAPACITOR
LESSON-2
* APPLICATIONS OF SUPER CONDUCTORS
* RESISTORS IN SERIES OR PARALLEL ( BOTH PROBLEMS AND THEORY)
* DETERMINATION OF INTERNAL RESISTANCE OF A CELL USING VOLTMETER
* LECLANCHE CELL
* LEAD ACID ACCUMULATORS LESSON-3
* THOMSON EFFECT
* BIOT-SAVART LAW
* MAGNETIC LORENTZ FORCE
* CONVERSION OF GALVANOMETER INTO A VOLTMETER
LESSON-4
* LENZ'S LAW - A CONSEQUENCE OF CONSERVATION OF ENERGY
* ENERGY ASSOCIATED WITH AN INDUCTOR
* SELF INDUCTANCE OF A LONG SOLENOID
* ENERGY LOSSES IN TRANSFORMER
* Q-FACTOR
LESSON-5
* CHARACTERISTICS OF EM WAVES
* HERTZ EXPERIMENT
* QUANTUM THEORY
* EXPRESSION FOR THE RADIUS OF nTH NEWTON'S DARK RING
* DIFFERENCE BETWEEN INTERFERENCE AND DIFFRACTION
* POLARISATION BY REFLECTION
* NICOL PRISM
* USES OF POLAROIDS
PROBLEMS FOR 2011 - 2012 ( +2 STUDENTS )
3 MARKS PROBLEMS :
LESSONS 2,4,3 AND 9 ( BOTH BOOK BACK AND EXAMPLES OR PTA BOOK QUESTIONS )
COMPULSARY PROBLEMS :
LESSONS 2 AND 8 ( BOTH BOOK BACK AND EXAMPLES OR PTA BOOK QUESTIONS )
10 MARKS QUESTIONS FROM VOLUME 2 ( 2011-2012):
6TH LESSON:
DETERMINATION OF SPECIFIC CHARGE OF AN ELECTRON- J.J.THOMSON'S METHOD
RADIUS OF nth ORBIT,INCLUDING TWO POSTULATES ( PAGE 14 TO 16)
ENERGY OF nth ORBIT
RUBY LASER
8TH LESSON:
GEIGER- MULLER COUNTER
NUCLEAR REACTOR (MODERATOR,CONTROL RODS,COOLING SYSTEMS,NEUTRON REFLECTOR,USES OF REACTOR AND ITS DEFINITION)
9TH LESSON:
BRIDGE RECTIFIER
TRANSISTOR AMPLIFIER, WORKING,INCLUDING GRAPH
COLPITT'S OSCILLATOR
10TH LESSON:
FM TRANSMITTER AND FM SUPERHETERODYNE RECEIVER
MONOCHROME TV RECEIVER
VIDICON CAMERA TUBE.
EFFORT GIVES YOU COMFORT.
10 MARKS QUESTIONS FROM VOLUME 1 (2011-2012):
1ST LESSON:
ELECTRIC FIELD DUE TO AN ELECTRIC DIPOLE ON AN AXIAL LINE
APPLICATIONS OF GAUSS'S LAW, 1st & 2nd
EFFECT OF DIELECTRIC ON A PARALLEL PLATE CAPACITOR
VAN DE GRAFF GENERATOR
3RD LESSON:
JOULE'S LAW OF HEATING EFFECT
MAGNETIC INDUCTION DUE TO INFINITELY LONG STRAIGHT CONDUCTOR CARRYING CURRENT
FORCE ON A CURRENT CARRYING CONDUCTOR
MOTION OF A CHARGED PARTICLE IN AN UNIFORM MAGNETIC FIELD
CYCLOTRON , INCLUDING LIMITATIONS.
4TH LESSON:
RLC IN SERIES
AC GENERATOR (SINGLE PHASE)
AC CIRCUIT WITH CAPACITOR
5TH LESSON:
TYPES OF SPECTRA
YOUNG'S DOUBLE SLIT EXPERIMENT
NEWTON'S RINGS ,BOTH (EXPERIMENT,THEORY &EXPRESSION,APPLICATIONS)
INTERFERENCE IN THIN FILMS.
THOROUGH ALL THE ANSWERS FOR THE GIVEN ABOVE QUESTIONS, BEFORE YOUR PUBLIC EXAMS .
BELIEF KEEPS YOU RELIEF.
Friday, 18 November 2011
G M COUNTER
PRINCIPLE: Ionisation produced in the gas by nuclear radiations .
CONSTRUCTION:
* A metal tube with glass envelope (C) act as cathode.
*A fine tungsten wire (W) along the axis of the tube, act as anode.
* GM tube insulated from the wire is filled with an inert gas like argon at a low pressure.
* The radiations enter through a window (E) made of thin mica sheet.
*About 1000 volt is applied through a high resistance R (100 M ohm)
WORKING:
* Due to primary ionisations few ions produced are accelerated by high potential difference .
* These ions/electrons cause further ionisation and due to collisions, avalanche of electrons are produced.
* These electrons reaching the anode produces a current pulse.
* A high potential difference developed across R is amplified and operates an electronic counter.
* The counts in the counter is directly proportional to the Intensity of Ionising radiations.
* Ionisation of the gas does not depend on type of Incident radiations.
* Wilson's Cloud Chamber ,a particle detector records the visual observations of the tracks of charged particles.
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