Lahore Board 2014
Inter Part-II
Group-I
Time:20 Min.
Objective Type
Marks=17
Note: Four Possible answers A, B, C and D to each question are the given. The choice which you think is correct, fill that circle in front of that question with marker or pen ink in the answer-book cutting or filling two or more circles will result in zero mark in that question. 

• If the medium between the charges is not free space then electostic force will :

(A) Increases
(B) Decreases
(C) Remain same
(D) None of this

• A particle carrying a charge of 2e falls through potential difference of 3v. energy acquired by it is:

(A) 9.6x10^-16j
(B) 9.6x10^-20j
(C) 9.6x10^-15j
(D) 9.6x10^-19j

• The substance having negative temperature co-efficient is:

(A) Carbon
(B) Iron
(C) Tungsten
(D) Gold

• The SI unit of magnetic indication tesla is equal to:

(A) NA^-1m^-1
(B) Nam^-1
(C) NA^-1m
(D) NA^-2m^-1

• Cathode ray oscilloscope works by deflecting a beam of :

(A) Neutrons
(B) Protons
(C) Electrons
(D) Positrons

• the most common source of an A.C voltage is :

(A) Motor
(B) Cell
(C) Generator
(D) Thermocouple

• Lenz’s law in a accordance with the law of conservation of:

(A) Momentum
(B) Charge
(C) Angular momentum
(D) Energy

• The basic circuit element in A.C circuit which controls currenr:

(A)  Resistor only
(B) Capacitor only
(C) Inductor only
(D) All of these

• At resonance frequency, the impedance of RLC series circuit is :

(A) Zero
(B) Minimum
(C) Maximum
(D) Moderate

• The ability of a body to return to its original shape is called :

(A) Strain
(B) Stress
(C) Elasticity
(D) Plasticity

• The output voltage of a rectifier is :

(A) Smooth
(B) Pulsating
(C) Perfectly direct
(D) Alternating

• A light emitting diode(LED) emits light only when :

(A) Reverse biases
(B) Forward biased
(C) Unbiased
(D) None of these

• Joule-second is the unit of :

(A) Energy
(B) Wien’s constant
(C) Plank’s constant
(D) Boyle’s law

• Energy of the 4^th orbit in hydrogen atom is :

(A) -2.51ev
(B) -3.50ev
(C) -13.6ev
(D) -0.85ev

• Life time of meta stable state is :

(A) 10^-5s
(B) 10^-3s
(C) 10^-8s
(D) 10^-2s

• The charge on β-particle is :

(A) +e
(B) -e
(C) +2e
(D) None of these

• Which one belongs to lepton’s group :

(A) Electrons
(B) Muons
(C) Neutron
(D) All of these

Inter (Part-II)
Lahore Board 2014
Physics Paper II (Essay Type)
Time Allowed: 3.10 hours
Max.Marks:83
(Group-I)

(SECTION-I)

2. Write short answers to any EIGHT (8) questions: 16

• Show that N/C=V/m
• The potential is constant through a given region of space. Is the electric field zero or non zero in the region? Explain.
• Suppose that you follow an electric field line due to a positive point charge. Do the electric field and potential increase or decrease?
• How can you identify that which plate of the capacitor is positively charged?
• Describe right hand rule to find the direction of lines of magnetic field?
• What do you mean by Lorentz force?
• Why the voltmeter should have very large resistance?
• How can you use magnetic force to separate isotopes of chemical elements?
• Write two methods to change flux for electromagnetic induction.
• Write the principle of electric generator.
• Does the induced emf always act to decrease the magnetic flux through a circuit?
• Can a step up transformer increase the power level?

3. Write short answers to any EIGHT (8) questions: 16

• Which charge actually flow in case of conventional current?
• State Krichhoff’s loop rule.
• How does resistance of conductor rise with temperature?
• What is choke?
• How does the reception of a particular radio station is selected on your radio set?
• How does doubling the frequency affect the reactance of a capacitor?
• What is difference between intrinsic and extrinsic semi conductor?
• What is squid and where is it used?
• Differentiate critical temperature from curie temperature.
• Write down the characteristics of operational amplifier.
• Why the base current in a transistor is very small?
• Draw diagram of X OR gate write down its truth table.

4. Write short answers to any SIX (6) questions: 12

• Which photon red, green, or blue carries the most (a)energy and (b)momentum.
• When does light behave as a wave? When does it behave as a particle?
• What are black body radiations?
• With reference to energy, distinguish between orbital electron and free electrons.
• How can the spectrum of hydrogen contain so many lines when hydrogen contains one electron.
• ¹³⁹ ₅₆ Ba emits a ẞ-particle and Lanthanum La is formed.
• Define binding energy and give its formula.
• Which radiation does would deposit more energy to the body (a)10mGy to the hand or (b) 1 mGhy does to the entire body? Explain why?
• What do we mean by critical mass?

(SECTION-II)

Attempt any THREE questions.

5. (a) What is potentiometer? Describe its principle, Construction and working. (5)

(b) A particle having a charge of 20 electrons on it falls through a potential difference of 100 volts. Calculate the energy acquired by it in electron volts. (3)

6. (a) What is C.R.O? Describe its construction and working point out its usese in electronics. (5)

(b) A square coil of side 16 cm has 200 turns and rotates in uniform magnetic field of magnitude 0.05 T. if the peak value of e.m.f is 12v, What is angular velocity of coil? (3)

7. (a) Explain RLC series circuit in detail. Also point out its important properties. (5)

(b) A 1.25 cm diameter cylinder is subjected to a load of 2500 kg. Calculate the stress on the bar in mega Pascals. (3)

8. (a) What is an amplifier? Explain the CE transistor as an amplifier. Determine the voltage gain of transistor amplifier also. (5)

(b) What is the energy of photon in a beam of infrared radiation of wavelength 1240 nm? (3)

8. (a) What are X-rays? How these are produced? Write down any two uses of X-rays. (5)

(b) Radiation from a point obeys the inverse square law. If the count rate at a distance of 1.0 m from Geiger counter is 360 counts per minuts, what will be its count rate at 3.0 m form the source? (3)

(SECTION-III)
(Practical Part)

A . Attempt any four questions. (8)

• Why is half deflection method called so?
• Does the tungsten filament of a lighted lamp obey Ohm’s law?
• Name and define the units of capacitance.
• Why NOT gate known as inverter?
• What are the practical use of potentiometer?
• How a galvanometer can be converted into an ammeter?
• What is the principles of slide wire bridge?
• Why a diode does not conduct when it is reserve biased?

B . Write down the brief procedure to determine the resistance of Galvanometer by half deflection method. (3)

OR

Write down the brief procedure to make a fire alarm using logic gates.

C . Answer the question given blow on the basis of following graph:

1. Write the inference from the graph.
2. What does the slope of graph represent (Image)
   • What do you infer from graph?
   • What does the X-intercept of graph inform? (Image)

Lahore Board 2014
Inter Part-II
Group-II
Time:20 Min.
Objective Type
Marks=17
Note: Four Possible answers A, B, C and D to each question are the given. The choice which you think is correct, fill that circle in front of that question with marker or pen ink in the answer-book cutting or filling two or more circles will result in zero mark in that question.

• Equation ø= E.A is applicable to a surface:

(A) Spherical
(B) Cylindrical
(C) Conical
(D) Flat

• The amount of energy acquired or lost by an alpha particle as it moves through p.d. of I v is :

(A) 3.2x10^-19j
(B) 6.4x10^-19j
(C) 1.6x10^-19j
(D) Zero

• The substance having negative temperature co-efficient is:

(A) Carbon
(B) Iron
(C) Tungsten
(D) Gold

• The SI unit of magnetic indication tesla is equal to:

(A) NA^-1m^-1
(B) Nam^-1
(C) NA^-1m
(D) NA^-2m^-1

• Sensitivity of a galvanometer can be increased by :

(A) Decreasing the value of torsional couple
(B) Decreasing number of turns
(C) Decreasing area of plane of coil
(D) Decreasing magnetic filed

• If magnetic field is doubled then magnetic energy density becomes :

(A) Four time
(B) two time
(C) Three time
(D) Six times

• The inductance can be increased by winding the wire around a core made of:

(A) Copper
(B) Silicon
(C) Iron
(D) Aluminum

• The impedance of RLC series circuit at resonance is given by:

(A)
(B) Capacitor only
(C) Inductor only
(D) All of these

• The capacitive reactance to pure D.C is :

(A) Zero
(B) Infinite
(C) Variable
(D) Equal to inductive reactance

• Which of the following has the least hysteresis loop area:

(A) Steel
(B) Wrought iron
(C) Soft iron
(D) Cobalt

• Which factor does not affect the conductivity of PN-juncation diode:

(A) Doping
(B) Temperature
(C) Voltage
(D) Pressure

• The base in a transistor is of the order of:

(A) 10^-6m
(B) 10^-4m
(C) 10^-3m
(D) 10^-1m

• Which light photon has the least momentum:

(A) Red
(B) Blue 
(C) Yellow
(D) Green

• Which is not true for x-rays :

(A) X-rays are not deflected by electric field
(B) X-rays are polarized
(C) X-rays consist of electromagnetic waves
(D) x-rays can be diffracted by grating

• Number of electrons emitted in photoelectric effect depends upon:

(A) Intensity of inside light
(B) Frequency of incident-light
(C) Energy of incident light
(D) Wavelength of incident light

• Which is true for both a-particles and Y-rays :

(A) They cause ionization in air..
(B) They cause be deflected by electric field
(C) They cause can be deflected by magnetic field
(D) They can penetrate a few millimeter of aluminum

• Mass of meson is :

(A) Greater then proton
(B) Less than patron
(C) Equal to proton
(D) Equal to neutron

Inter (Part-II)
Lahore Board 2014
Physics Paper I (Essay Type)
Time Allowed: 3.10 hours
Max.Marks:83
(Group-II)

(SECTION-I)

2. Write short answers to any EIGHT (8) questions: (16)

• Suppose that you follow an electric field line due to a positive point charge. Do electric field and potential increase or decrease?
• If a point charge q of mass m is released in a non- uniforn electric field with field lines pointing in the same direction, will it make a rectilinear motion?
• Define time constant and give its formula.
• How many are the number of electrons in one coulomb charge?
• What is phantom bar magnet?
• What should be the orientation of current carrying loop in a magnetic field so that torque acting upon it is (a)Maximum (b) Minimum
• How can you use a magnetic field to separate isotopes of chemical element?
• What is function of sweep generator in cathode ray oscilloscope?
• Explain working of a heater that works on the principle of electromagnetic induction.
• How can we improve the efficiency of a transformer?
• In a certain region the earth’s magnetic field points vertically downward. When a plan flies due north, which wingtip is positively charged?
• Can D.C motor be turned into a D.C generator? What changes are required to be done?

3. Write short answers to any EIGHT (8) questions: (16)

• What is meant by electromotive force, give its unit?
• How is rheorstat used as potential divder?
• What are the difficulties in testing whether the filament of lighted bulb obey’s Ohm’s law?
• Name the device that will:
  • Permit flow of direct current but oppose the flow of an alternating current.
  • Permit flow of alternating current but not the direct current.
• What is resonance condition in RLC series circuit?
• What is choke? What is its main use?
• Define modulus of elasticity. Show that units of modulus of elasticity and stress are same.
• Explain briefly the conductors on the basis of energy brand theory.
• Draw the figure showing electrical conduction by holes in semi conductors?
• What is the principle of virtual ground? Apply it to find the gain of an inverting amplifier.
• Draw the symbol of X OR Gate and write it truth table.
• Write two applications photo diode.

4. Write short answers to any SIX (6) questions: (12)

• Distinguish between general theory of relatively and special theory of relatively.
• Can pair production take place in vacuum? Explain.
• What advantages of an electron microscope has over an optical microscope?
• Can electron in the ground state of hydrogen absorb a photon of energy 13.6 ev and greater than 13.6 ev ?
• What is meant by line spectrum? How it can be used for the identification of elements?
• Why are heavy nuclei unstable?
• How can radioactivity help in the treatment of Cancer?
• How factor make a fusion reaction difficult to achieve?
• A particle which produces more ionization is less penetrating , Why?

(SECTION-II)

Attempt any THREE questions.

5. (a) What is electric field? Find the electric field intensity due to an infinite sheet of charge. (5)

(b) A rectangular bar of iron is 2.0 cm by 2.0 cm in cross-section and 40 cm long. Calculate its resistance if the resistively of iron is 11 x 10^-8 Ωm. (3)

6. (a) What is an inductor? Determine energy stored in an inductor. (5)

(b) Find the value of magnetic field that will cause a maximum force of 7.0x10^-3  N on a 20.0 cm straight wire carrying a current of 10.0 A. (3)

7. (a) Define Doping. Describe N-type semiconductor. (5)

(b) Find the capacitance required to construct resonance circuit of frequency 1000 KHZ with an inductance of 5Mh. 3

8. (a) What are the black body radiations? Explain the effect of temp. on Radiation emitted by hot body. Also discuss energy distribution curve of black body among different wavelength.

(b) Calculate the gain of non-inverting amplifier shown in fig: 3 (image)

9.(a) What is LASER? Explain its principle and LASER Action in full details. 5

(b) If ²³³ ₉₂ U decays twice by α-emission, What is the resulting isotope? 3

(SECTION-III)
(Practical Part)

A . Attempt any four questions. (8)

• Define receptivity. How can you find receptivity if resistance is known?
• Draw the circuit diagram to find the resistance of galvanometer by half deflection method.
• What are the particle uses of potentiometer?
• Is the resistance of voltmeter high or low? Why?
• What is the difference between photo cell and photo voltaic diode.
• Draw the symbol and truth table of NOR gate.
• Draw the reserve and forward bias characteristics of junction diode.
• What do you mean by internal resistance of a cell?

B . Write down the brief procedure to find the resistance of galvanometer by half deflection method. 3

OR

Explain the experimental method to convert a given galvanometer Into voltmeter.

C . Graph shows the variation of resistance of conductor with Temperature

• What do you conclude from graph?
• What is the resistance at 50 ̊C?

 (IMAGE)

OR

Graph shows the variation of current by changing capacitance in an ac circuit:

• What do you conclude from this graph?
• Find the capacitance for 90 m A current.

(Image)