Inter (Part-II) Sargodha Board 2015
Physics
Part II (Objective Type)
Time Allowed: 20 Minutes 
Max. Marks: 17

Note: You have four choices for each objective type question as A, B, C and D. The choice which you think is correct; fill that circle in front of that question number. Use marker or pen to fill the circles. 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.

• The product of resistance and capacitance is called.

(A) Force.
(B) Time
(C) Velocity
(D) Current

• Capacitance of a Capacitor in Vacuum is given by

(A) A ϵ_n/d
(B) A ϵ_r/d
(D) Ad/ϵ
(D) A/ϵd

• The unit of electromotive force is called.

(A) Newton
(B) Pascal
(C) Volt
(D) Ampere

• The sum of electric and magnetic force is called.

(A) Maxwell force
(B) Lorentz force
(C)Newton’s force
(D) Centripetal force

• In cue of conversion of galvanometer into ammeter the shunt resistance is connected.

(A) In parallel
(B) In series
(C) Neither parallel nor series
(D) Both (a) and (b)

• In alternating current, Inductor behave like

(A) Semi conductors
(B) Inductors
(C) Resistors
(D) Insulators

• Commutators are used in

(A) D.C generators
(B) A.0 generators
(C) A.C motor
(D) A.C rotator

• Direct current cannot Nov through

(A) Resistor
(B) Capacitor
(C) inductor
(D) Voltmeter

• Capacitive reactance X_ϵ =

(A) 2πfC
(B) 1/2πfC
(C) 4πfC
(D) 1/4πfC

• At 0 k semi conductors are

(A) Conductors
(B) Insulators
(C) Perfect conductors a
(D) Perfect insulators

• In forward biasing, the value of resistance is

(A) Large
(B) Very large
(C) Small
(D) Very small

• Current gain β of a transistor is

(A)                                                                      
(B)                                                                                                                                                          
(C)  
(D)                                                                                                                                           

• Minimum energy r :qui red for pair production is z

(A) 0.51 MeV
(B) 0.81 MeV
(C) 1.02 MeV
(D) 1.05 MeV

• The value of I in Heisenberg uncertainty Principle is.

(A) 1.05x 10^-30 Js
(B) 1.05x10^-32 Js
(C) 1.05x10^-34 Js
(D) 1.05 x 10^-36 Js

• The value of Rydberg's constant is

(A) 1.09 x I0 ⁷ m^-1
(B) 1.09x10⁸m^-1
(C) 1.09x10 ⁹ m^-1
(D) 1.09 x 10¹⁰ m^-1

• 16) The value of I U mass =

(A) 931 MeV
(B) 932 MeV
(C) 933 MeV
(D) 934 MeV

• A pair of quark and anti quark m400 a

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

Inter (Part-II) Sargodha Board 2015
Physics
Part II (Subjective)
Time Allowed: 2.10 Hours 
Max. Marks: 83 

Section I

2. ANSWERS briefly any Eight parts from the followings:-

• Describe the force or forces on a positive point charge when placed between parallel plates (a) with similar and equal charges (b) with apposite and equal charges.
• Do electrons tend to go to region of high potential or of low potential?
• Whir is meant by Photoconductor? Explain with example.
• What is capacitor? Define unit capacitance.
• What is Lorentz force? Derive equation for Lorentz force.
• How we can convert a galvanometer into Ammeter?
• TWO charge particles are projected into a. region where there is a magnetic field perpendicular to their velocities. If the charges are deflected in opposite direction, what can you say about them?
• Why die resistance of an ammeter Should be very low?
• How an AC generator can be convened into a DC generator? (x) How step-up transformer is useful for the transmission of electrical power?
• Show that ϵ and ∆ᶲ/∆l have the same units.
• How would you position flat loop of wire in a changing magnetic field so that there is no induced in it?

3. Answer briefly any eight parts from the followings:- 8x2=16

• What is drift velocity?
• Why does the resistance of a Conductor rise with temperature
• Describe a circuit which will give a Continuously varying potential.
• What is Impedance? Give is S.I Unit.
• Explain tile Conditions under which electromagnetic wave arc produced from a once?
• How the reception of a particular radio-station is selected on your radio set?
• What do you meant by Hysteresis?
• Distinguish between Crystalline and amorphous solid. 
• Define the terms; Elastic limit, yield point.
• Write down the login table and expression of NAND-Gate.
• What is net charge on a n-type or a p-type substance?
• Why ordinary silicon diode do not emit light?

4. Answer briefly any Six parts from the followings:- (6x2=12)

• Define Stefan Boltzmann Law for radiation.
• Can pair production take place in vacuum? Explain.
• What advantages an electron microscope has over an optical microscope?
• Write the difference between spontaneous and stimulated emission.
• What do we mean when we say that an atom is excited?
• What is the resemblance between the emission of y – radiation and photon from an atom.
• What is radioactive tracer? Give its one application in industry.
• What are isotopes'? Give example.
• Describe the principle of operation of a solid stare detector.

Section………II

Note: Attempt any three questions. (8x3=24)

Question #5
(a)What is a potentiometer. How emf of a cell is determined using .potentiometer.
(b) Find the electric field strength required to hold suspended a particle of mass 1.0 x 10^-6 kg and charge 1.0 µc between two plates 10.0 cm apart.

Question #6
(a) Define and explain mutual induction.
(b) How fast must a proton move in a magnetic field of 2.50 x10^-3 T such that the magnetic force Is equal to its weight? . .

Question #7
(a) Describe an LL.G series circuit. Derive the relation for resonance frequency in this circuit and Write its properties.
(b) A wire 2.5 m king and cross-section area I 0^-5m² is stretched 1.5 mm by a force of 100 N in the elastic region. Calculate the energy stored in the wire.

Question #8
(a) What is meant by rectification? Discuss full wave rectification.
(b) A bar 1.0 to in length and located along h-owls moves with a speed of 0.75 c with respect to a stationary observer. What is the length of the bar as measured by the stationary observer.

Question #9
(a) Define X-rays, how are they produced, also write two uses.
(b) The half-life of an element is 9.70 hours. Find its decay constant.

Section………III (PRACTICAL)

Question #10 (a) Attempt any four parts:- 4x2=8

• What are ohmic and non-ohmic materiaIs?
• Why an ammeter is connected in series in a Circuit?
• Diameter of the wire of slide wire bridge should be uniform. Why?
• Draw the circuit diagram to find the internal resistance of voltmeter.
• What is digital system?
• Give the symbol and truth table of-NOT gate.
• Define time Constant. Give its unit.
• What do you mean by stopping Potential, why it is named so?

(b) Write down the brief (Procedure to determine the resistance of x given were by 3

using a elide wire bridge.

OR

Write down the brief procedure to study the characteristics of a Semi-conductor diod and determine its forward and reverse characteristics.

(c) Graph A (i) What do you infer from graph? (ii) Find out slope of graph. What does it represent?

Graph B (i) What do you infer from graph? (ii) Find slope of the graph and its strata

(IMAGES)