PEC GRADE 5 GRADE 8 ONLINE RESULT 2015
Important Numericals:
A Carnot Engine whose low temperature reservoir is at 200K has an effeciency of 50%. It is desired to increase this to 75%s. by how much degrees must the temperature be decressed, If higher temperature of the reservoir remains constant?
A photon of Wavelength 4×1013m in the vicinity of a heavy nucleus produces an electronpositron pair. Find the Kinetic Energy of each particle if the kinetic enrgy of positron is twice of the electron?
A copper wire of 1.571 x 10(power2)m is used as a shunt in an ammeter of range 5amp which is obtained by modifying a galvanometer of resistance 19.8 ohm. if the radius of copper wire is 2mm then calculate the current which produce full scale deflection in galvanometer. (for copper resisitivity is 1. x 10 8?
A capacitor of 200PF is charged to a potential of 100 volts. its plates are then connected in parallel to another capacitor and is found that potential difference between the plates falls to 0 valts. What is the capacitance of the second capacitor?
What is the e.m.f. of the cell when a resistance of 2ohms is connected across the terminals of a cell, the current is 0.5A, but when the resistance across the cell is 5ohm the current is 0.25 A?
Sodium (11Na23) has an atomic mass of 22.989u. find the total binding energy of the sodium nucleus and estimate the binding energy per nucleon?
Important Questions:
Chapter 11:
Molar specific heat
CpCv=R
B=3a
1st law of thermodynamics (with processes)
2nd law of thermodynamics
Describe Isobaric and Adiabatic process with graphical representation?
Equate the clausius and kelvin statements
Equate the entropy and 2nd law of thermodynamics
Define coefficient of Linear and Cubical expension with unis. Also show that coeffecient of linear expension is equal to the one third of coeffeient of cubical expension?
P=1/3pV2
K.E is directly proportional to Temperature
Prove acoccording to the KMT that (P is inversly proportial to 1/v), PV=nRT
Chapter 12:
Gauss’s law and (its prove)
Application of the Gauss’s law (spherical charged shell, infinite sheet of charges, two oppositively charged plates)
Factors effecting on the capacitance of the capacitor
Electric Flux
Capacitors (in series and parallel)
Coulumb’s law
Chapter 13:
Resistivity
Temperature coefficient
e.m.f with its derivation
Resistance (in series and parallel)
Ohm’s law with its limitation
Chapter 14:
F=Bsintheta
JJ Thomson’s Experiment
Derivation for B, A.C generator
Laws of electromagnetic induction
Mutual Induction
Self Induction
Ampere’s circular law with ots application
Lenz’s law
Magnetic flux
Motional e.m.f
F=qvB
Power loss in transformer
Chapter 15:
Galvanometer
Ammeter and Voltmeter
Factors effecting on the sensitivity of the galvanometer
Voltmeter
Wheat stone bridge
Construction and working of galvanometer
Chapter 16:
Diode as a rectifier
P type, n type
Semi conductor
Forward bias, Reversed bias
Band theory
Chapter 17:
Compton effect
Theory of relativity with its consequence
Einstien results for the photo electric equation
Chapter 18:
Derivation of enrgy level diagram
Bohr’s Xray production
Laser, ruby laser
Chapter 19:
Exponential equation of the radioactive decay
Law of radioactive decay
Half life
Fission and fusion
Nuclear reactor
Mass defect
Binding Energy
Chapter 20:
Geiger mular counter

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