## Physics Guess Paper of Board Intermediate Exam Part 2

**Dae education provide Fa part 2 ****Physics**** past paper 2015 federal board, you can download federal board past papers on daeeducation.com.**

Are you a student who are searching, inter part 2 physics guess papers? Here we collect some most important questions for a tough subject of inter part 2 name Physics. Most students face difficulties while they are solving numerical questions of physics. We have fetch some most common questions from last five year physics past papers of inter part 2.

### FSc 2nd year Physics guess papers 2015:

We hope that by preparing this **physics guess paper for inter part 2**students can figure out their final preparation of 12th class annul exams.

### FSC Part 2 Physics Important Questions 2015

**Question # 1**

Find force on a moving charge in magnetic field.

Or

What current should pass through a solenoid that is 0.5 m long with 10,000 turn of copper wire so that it will have a magnetic field of 0.4 T?

Or

Find value of magnetic field that will cause a maximum force of 7.0 x 10^{-3} N on a 20.0 cm straight wire carrying a current of 10.0 A

Or

A solenoid 15 cm long has 300 turns of wire. A current of 5 A flows through it. What is the magnitude og magnetic field inside the solenoid

**Question # 2**

A D.C motor operates at 240 volts and has a resistance of 0.5 Ω. When the motor is running at normal speed, the armature current is 15 A. find back emf in the armature

Or

A D.C motor operates at 240 V and has a resistance of 0.5 ohm. When the motor is running at normal speed, the armature current is 15 A. find back emf.

Or

Alpha particles ranging in speed from 1000 mS^{-1}^{ }to 2000 mS^{-1}^{ }enter a velocity selector where the electric intensity is 300 Vm^{-1} and the magnetic induction is 0.20 T. Which particle will move undeviated?

Or

Define motional e.m.f and derive a relation for it.

**Question # 3**

Describe the formation of energy bands in solids. Explain the difference amongst electrical behavior of conductors, insulators and semi-conductor in term of energy band theory.

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Explain contactor, insulators and semiconductors on the bases of energy band theory

**Question # 4**

Find the value of the current flowing through a capacitor 0.5 µF when connected to a source of 150 V at 50 Hz

Or

The current flowing into the base of a transistor is 100 µA. Find its collector current I_{c} and its emitter current I_{E} if value of current gain is 100

Or

Find the value of the current flowing through a capacitance 0.5 µF when connected to a source of 150 V at 50 Hz

Or

The current flowing into the base of a transistor is 100 µ A. Find the collector current I_{c} its emitter current I_{E}, if the value of current gain ß is 100

**Question # 5**

What is semi-contactor diode? Explain its behavior when it is forward biased and reversed biased

Or

What is semi-contactor diode? Explain its characteristics during forward and reversed biased

**Question # 6**

What the de-Broglie wavelength of an electron whose K.E. is 120 eV?

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An electron is accelerated through a potential difference of 50 volts. Calculate its de-Broglie wavelength

Or

A particle of mass 5.0 mg moves with speed of 8.0 mS^{-I}. Calculate its de-Broglie wavelength. (h = 6.63 x 10^{-34}^{ }J.S.)

**Question # 7**

Give the postulates of Bohr’s model of a hydrogen atom and drive the quantized radii of hydrogen atom

Or

In Bohr’s atomic model of hydrogen atom, the electron is in an orbit around the nuclear proton at a distance of 5.29 x 10-^{11}^{ }m with a speed of 2.18 x 10^{6}^{ }m/s. Find

(i) Electron potential that a proton exerts at this distance

(ii) The ionization energy for the atom is eV

Or

Write Bohr’s second postulate and find out formula for Bohr’s quantized radii

**Question # 8**

A charge of 90 C passes through a wire in one hour and 15 minutes. What is the current in the wire?

Or

An ideal step down transformer is connected to main supply of 240 V. it is desired to operate a 12V, 30 W lamp. Find the current in the primary and the transformation ratio

Or

A particle carrying a charge of “2e” falls through a potential difference of 3.0 volts. Calculate the energy acquired by it

**Question # 9**

Derive the expression for impedance and phase angle for R – C and R – L series circuit when excited by a.c. supply.

Or

What is R-C series circuit? Calculate the impedance and phase angle of R-C series circuit?

Or

Define impedance. Find its value for R.C series circuit and explain with phase or diagram.

**Question # 10**

A 1.25 cm diameter cylinder id subjected to a load of 2500kg. Calculate the stress on the bar in mega Pascal

Or

A 1.0 m long copper wire is subjected to stanching force and its length increases by 20 cm. calculate the tensile strain and percentage elongation which the wire undergoes

Or

What stress would cause a wire to increase in length by 0.01%, if the Young’s module of the wire is 12 x 10^{10} Pa. What force would produce this stress if the diameter of wire is 0.56mm?

**Question # 11**

Explain mass defect and binding energy.

Or

Find the mass defect and binding energy for tritium, if G.M. Counter

**Question # 12**

Find charge on electron by Millikan’s method

**Question # 13**

State and explain Coulomb’s law for electrostatic charges. Give its vector form also

**Question # 14**

A rectangular bar of iron is 2.0 cm by 2.0 cm in cross-section and 40 cm long. Calculate its resistance id resistivity of iron is 11 x 10^{-3}^{ }Ω-m

Or

A rectangular bar of iron is 2 cm by 2 cm in cross-section and 40 cm long. Calculate its resistance id resistivity of iron is 11 x 10^{-8}^{ }Ω-m

**Question # 15**

Define galvanometer. How it can be converted into ammeter and voltmeter? Describe them

Or

Describe the principle, construction and working of moving coil galvanometer

**Question # 16**

What is the resonant frequency of a circuit which includes a coil of inductance 2.5 H and a capacitance of 40 µ F?

**Question # 17**

Define resistivity and explain its dependence upon temperature. Also derive a relation for temperature co-efficient in term of resistivity.

Or

What is resistivity and conductivity? Name their units. How resistivity depends upon temperature?

**Question # 18**

Explain Heisenberg Uncertainty Principle

Or

State and prove the Heisenberg Uncertainty Principle

**Question # 19**

What is transistor and how is it used as an amplifier? Give its circuit diagram. Deduce the relation for its voltage gain

Or

How an n-p-n transistor works as an amplifier? Give its circuit diagram. Deduce the relation for its voltage gain

Or

In a certain circuit the transistor has a collector current of 10 m A and a base current of 40 µ A. What is the current gain of the transistor?

**Question # 20**

What is the energy of a photon in a beam of infrared radiation having wavelength 1240nm?

Or

An electron jumps from energy level E_{1}_{ }= -3.5 x 10 ^{-19}^{ }J to E_{2}_{ }= -1.20 x 10^{-18}^{ }J. what is the wavelength of emitted light?

Or

Compute the shortest wavelength radiation in the Balmer services

Or

What is the energy in eV of quanta of wavelength 400 nm?

Or

A tungsten target is struck by electron that gas been accelerated from rest through 40 KV potential difference. Find the shortest wavelength of the bremsstrahlung radiation emitted

**Question # 21**

What are X-rays? How are they produced?

Or

Electron in an X-ray tube are accelerated through a potential difference of 3000 V. if these electrons were slowed down in a target, what will be the minimum wavelength of X-ray produced?

Or

Explain characteristics X-ray and continuous X-ray spectra. Also write two uses of X-ray

Or

X –ray of wavelength 22 pm are scattered from a carbon target. The scattered radiation being viewed at 85 ° to the incident beam. What is Compton shift: (here h = 6.63 x 10^{-34} J.S) and (cos 85 ° = 0.087)

**Question # 22**

The half life of an isotops is 9.70 hours. Find its decay constant

Or

The half life of 91/38 Sr is 9.70 hours. Find its decay constant

**Question # 23**

State Gauss’s law and find electric intensity due to an infinite sheet of charge

Or

Find electric field intensity due to an infinite sheet of charge

**Question # 24**

What is nuclear reactor? Describe the function of its main parts

Or

What is radioactive? Discuss emission of α, ß and γ particles from radioactive nuclei

Or

A 75 kg person receives a whole body radiation dose of 24 m-rad, delivered by α-particles for which RBE factor is 12. Calculate the absorbed energy in joules

**Question # 25**

What is G.M. Counter? Give its construction. How is it used to count the nuclear radiations?

**Question # 26**

State and explain Lenz’s law. How this law explains conservation of energy during electromagnetic induction?

**Question # 27**

Draw the circuit diagram of non-inverting amplifier and label it. Evaluate a relation for its gain

**Question # 28**

Define photoelectric effect. Explain photoelectric effect on the basis of quantum theory

**Question # 29**

Find the capacitance required to construct a resonance circuit of frequency 1000 KHz with an inductor of 5mH.

**Question # 30**

Write Bohr’s second postulate and find out formula for Bohr’s quantized radii

**Question # 31**

Give the statement of Ampere’s law. Apply it to find B due to a current carrying solenoid

**Question # 32**

Find relation for strain energy in deform materials

Or

What is the meant by strain energy? Derive the relation for strain energy in a deformed material from the area under the force extension graph.