Inter (Part-II) Bahawalpur 2014
Physics
Part II (Objective Type)
Time Allowed: 20 Minutes
Max. Marks: 17

Note: Four possible answers A, B, C and D to each question are 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.

Question #1
Circle the correct option i.e. A/B/C/D. Each part carries one mark.

• Mho m^-1 is the unit of:

(A) Resistance
(B) Resistivity
(C) Conductance
(D) Conductivity

• If the potential difference across two plates of n parallel plate capacitor 4 double then energy stored it will be:

(A) Two Times
(B) Eight Times
(C) Four Times
(D) Remain Same

• Identify the practical application or electrostatic force

(A) Inkjet Printer
(B) X- rays
(C) Laser
(D) A.C. Generator

• The Lorentz Force an a charged particle moving in electric field E and Magnetic Field B given by :

(A) F = F_E + F_B
(B) F = F_E - F_B
(C) F = F_B/F_E
(D) F = F_E F_B

• A pair of quark and anti quark make a:

(A) Meson
(B) Hardon
(C) Lepton
(D) Baryon

• Thr negative sign with induced emf in Faraday’s Law is a accordance with:

(A) Lens's Law
(B) Ampere’s Law
(C) Gauss’s Law
(D) Boyles Law

• Magnetic flux density is measured in

(A) Weber
(B) Weber /m²
(C) Tula - m
(D) Gauss

• In an A.C. circuit with resistor only the current and voltage have a phase of angle of

(A) 180⁰
(B) 90⁰
(C) 0°
(D) 60⁰

• A senser of light is

(A) Boron
(B) Aluminium
(C) Indium
(D) Light Dependent Resistance

• When a PN-junction is reverse biased the depection region is

(A) Widened
(B) Narrowed
(C) Normal
(D) None of these

• A positron is an anti-particle of

(A) Proton
(B) Electron
(C) Neutron
(D) Photon

• Which of the following has no change:

(A) Alpha rays
(B) Beta rays
(C) Gamma rays
(D) Cathode rays

• The principle regarding the dual nature of light was first discovered by:

(A) Campton
(B) JJ Thomson
(C) De-Broglie
(D) Heisenberg

• The mass of Beta Particle is equal to mass of

(A) Proton
(B) Electron
(C) Neutron
(D) Boron

• Laser can be made by creating

(A) Meta Stable state
(B) Population Inversion
(C) Excited State
(D) All of these

Inter (Part-II) Bahawalpur Board 2014
Physics
Part II (Subjective)
Time Allowed: 2.10 Hours 
Max. Marks: 83 

Section I

2. Write short answers any Eight (8) questions of the following

• 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 released in a non-uniform electric field with field lines pointing in the same direction will it make a rectilinear motion?
• Is it true that Gauss's Law states that the total number of lines of forces crossing any closed surface in the outward direction is proportional to the net positive charge enclosed within the surface?
• Suppose that a charge q is moving in a uniform magnetic field with a velocity v. Why is there no work done by the magnetic force that .0 on dm charge?
• If a charged particle moves in a straight be through seine region of space, can you say that the magnetic field in the region is zero?
• How can a current loop be used to determine the presence of a magnetic field in a given region of space?
• How brightness on screen of CRO can be controlled?
• Can a step up transformer increase the power level? Explain
• Can an electric motor be used to drive on electric generator with the input from the generator being used to operate the motor?
• How the efficiency of a transformer or can be increased?
• Define Motional emf. Give its unit.
• Prove that t = RC

3. Write short answers any Eight (8) questions of the following  

• A potential difference is applied across the ends of a wire. What is the effect on the drift Velocity of electronic if potential difference is increased?
• Differentiate between Electronic Current and Conventional Current?
• Do bends in the wire affect the electric resistance of in wire?
• Define Peak value and peak to peak value of A.C Voltage?
• How many times per second will an incandescent lamp reach maximum brilliance when connected to a 50Hz source?
• In an RL Circuit will the current lead or lag the voltage. Explain by Vector Diagram.
• Differentiate between Amorphous and Polymeric Solids,
• Differentiate Depletion Region and Potential Barrier.
• Why a photodiode is operated in reverse biased state?
• Draw the input and output Waveforms of Half Wave and Full Wave Rectifier.
• Define stress and strain along with their units.
• Write a note on Super Conductors?

4. Write short answers ac y Six (6) questions of the following 

• What factors make a fusion reaction difficult to achieve?
• How can radio activity help in the treatment of cancer?
• Which has the lower energy quanta? Microwaves or X-rays?
• Is energy conserved when an atom emits a photon of light? Explain?
• Can x-rays be reflected, refracted, diffracted just like another waves? Explain.
• As a solid is heated and begins to glow why does it first appear red?
• What are the conclusions made from pair production?
• Write down at least four properties of B particles?
• What are the basic forces?

SECTION -II

Question #5
(a) Stat Kirchhoff’s rules and explain the voltage rule.
(b) A particle carrying a charge of 2e falls through a p.d of 3.0 v calculate the energy acquired by it..

Question #6
(a) Define Self induction. Explain how energy is stored in the magnetic field. Also find energy density.
(b) What shunt resistance must be connected across a galvanometer of 50.0. Resistance which gives full scale deflection with 2.0mA current, so as to convert it into an ammeter of range 10.0A?

Question #7
(a) Discuss the effect of Capacitor only M A.C. Circuit. Define reactance and write an expression for reactance of a capacitor. (5)
(b) (What Stress would causes a wire to increase in length by 0.01% if young Modulus of Wire Is 0.56mm.What force would produce this stress if diameter of the wire is 0.56mm

Question #8
(a) What is operational Amplifier? Describe the use of O.P AMP as Non-inverting Amplifier.

Question #9
(a) what is Laser? Discuss population inversion and Laser action.
(b) How much energy is absorbed by a man of mass 80kg who receives a lethal whole body equivalent dose of 400 rem in the form of low energy neutrons for which RBE factor is 10? (In How much energy is absurd by a man of mass 604 who receives a lethal whole body equivalent dose of 460 rem in the loan of low ant: neoes, for Mid RBE factor is 10⁷)