# 2nd Year Physics Guess Paper & And Important Questions

**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 4×10-13m in the vicinity of a heavy nucleus produces an electron-positron 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

Cp-Cv=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 co-efficient 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 X-ray 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