Inter (Part-II) Dera Ghazi Khan Board 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.

• One of the application of electrostatic Induction Is

(A) Laser
(B) Photocopier
(C) X-ray machine
(D) Wilson cloud chamber 

• Farad is define as

(A) Coulomb volt
(B) Ampere volt
(C) Coulomb/joule
(D) Volt/Coulomb

• The S.1unitof magnetic permeability is 

(A)Wb A^-1m^-1
(B) Wbm²
(C) Wb mA^-1
(D) Wb Am^-1

• Temperature co-efficient of resistivity is measured in

(A) Ω-K
(B) Ω-m
(C) K^-1
(D) K

• When Ohm meter gives full scale deflection it indicats

(A) Zero resistance
(B) Infinite resistance
(C) Small resistance
(D) Very high resistance

• The energy stored in the inductor per unit volume is

(A)   
(B)      
(C) WbmA^-1  
(D) WbAm^-1

• If we make magnetic field stronger the value of induced current is a

(A) Decreased
(B) Increased
(C)Vanishes
(D) Remains constant

• RLC series circuit of a quantity

(A) TAN-1    
(B) TAN-1  
(C) TAN-1 
(D) π red

• In the Capacitive circuit of a c quantity when q=0 the slop of q-t curve

(A) Minimum
(B) Maximum
(C) Zoo
(D) Negative

• A single domain in ferromagnetic subsume contain nearly

(A) 10⁰⁸→10⁰⁹
(B) 10¹² — 10¹⁵
(C) 10¹⁵-10²⁰
(D) 10¹² -10²⁰

• The device which is used as amplifier and with the Negative feedback is

(A) Operation amplifier
(B) n p n transistor
(C) p n p transistor
(D) Transistor

• Which is not work function is

(A) NOT 
(B) AND
(C) OR 
(D) NAND

• The velocity of electron in 1^st orbit of H-atom is

(A) eV
(B) Volt
(C) Fared
(D) Hertz

• The velocity of electron in I" orbit of kW is

(A) 2.09× 10⁶ m/sec
(B) 2.19 ×10⁶ m/sec
(C) 2.19×10⁶ m/sec
(D) 3.18×10⁶ m/sec

• Helium Neon Laser beam emitted from a discharge tube has a colour

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

• A pair of quark and anti quark make a

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

• The quantity of U²³⁵ in the naturally occurring is

(A) 0.2%
(B) 0.3%
(C) 0.7%
(D) 4%

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

Section I

Q1 Write short answers any Eight (8) questions of the following. 16

• Do electron tends to go to region of high potential or of low potential
• Electric lines of force never cross why?
• How can you identify that which plate of a capacitor is positively charge?
• Verify that on Ohm times farad is equivalent to second
• How can you use a magnetic field to separate isotopes of chemical elements?
• Why does the picture on a TV screen becomes destroyed when a magnetic is brought near the screen?
• Why the resistance of an ammeter should be very low?
• What is a stable galvanometer?
• Can a DC motor be return into a DC generator? What changes are required to be done
• Show that ɛ and ∆Φ/∆t have the same unit
• Does the induced emf always act to decreased the magnetic flux through the circuit.Explain
• How the power losses can be minimized in a transformer

Q3. Write short answers any Eight (8) questions of the following 16

• Why terminal potential difference of a battery decreased when the current drawn from it increased
• Describe a circuit which will give continuously varying potential
• Do bends in a wire affect its electrical resistance? Explain using formula
• What in a choke coil and why is it used in AC circuit.
• What are transmission frequency for electromagnetic waves in (a) A.M rang (b) F.M.rang
• Write four important properties of series resonance circuit.
• What are the responsible factors for production of magnetic field in a atom
• Write a note on super conductor
• How will you obtain n-types and p-types material from pure silicon?
• Why a photo diode is operated in reverse biased state?
• Write down the characteristic of the operational Amplifier?
• Why is the base current in a transistor very small?

Q4. Write short answers any SIX (6) questions of the following 12

• As a solid is heated and being to glow, why does it first appear red?
• Car pair production takes place in vacuum. Explain
• What do you understand work- function and stopping potential
• Can X-ray be reflected, refracted polarized just like any other waves. Explain
• What is meant by line spectrum? Explain how line spectrum can be used for identification of elements
• What are isotopes? What do they have in common.
• Why are heavy nuclei unstable.
• What fraction of a radioactive sample decays half lines have elapsed
• What are the uses of Nuclear?

SECTION -II

Note: Attempt ant three question from this section

Question #5
(a) What is Potentiometer? Explain its principle and working. (5)
(b) Using zero reference point at infinity, determine the amount by which a point charge of 4.0 ×10^-8C alters the electric potential at apoint1.2m away, when (a) Charge is positive (b)Charge is negative. (3)

Question #6
(a) State ampere’s law and apply it to find the magnetic induction due to current in a solenoid. (5)
(b) A coil of wire has 10 loops, each loop has an eara of 1.5×10-3m2 A magnetic field is perpendicular to the surface of each loop at all time .If the magnetic field is charged from 0.5T to 0.6T in 0.15 find the average emf induced in the coil during this time. (3)

Question #7
(a) Discuses RLC series circuit and also find the relation for resonance. (5)
(b) A 125cm diameter cylinder is subjected to a load of 2500kg.calculate the stress on the bar in mega Pascal. (3)

Question #8
(a) What is meant by rectification ,explain full wave rectification by bridge rectifier. What is the use of a filter circuit. (5)
(b) What is the energy of a photon in a beam of infrared radiation of wavelength 1240m. (3)

Question #9
(a) What are inner shell transition? Describe the production of X-Ray and their uses. (5)
(b) Find the mass defect and binding energy of the deuteron nucleus. The experiment mass of deuteron is 3.3435×10^-27 Kg. (3)

SECTION III (PRACTICAL)

Question #10

(A) Give answers to any four Question 2*4=8

• Draw the table to find the resistance of galvanometer by half deflection method
• What is the difference between photocell and photovoltaic cell
• What is potentiometer. Give its uses
• How the galvanometer is converted into ammeter
• Draw the symbol and true-table of OR-Gate
• Why the V ↔ l graph for a lighted bulb is not a straight line
• What is the behavior of a capacitor to (i) Steady e.m.f (ii) alternating e.m.f
• Why does not a diode conduct when it is a reverse biased

(B) Write down brief procedure for study in variation of current by intensity of light using “Photoelectric Effect”. (3)
OR
Write down brief procedure to determine the resistance of Galvanometer by Half-deflection Method.

(C) Answer down question given below under graph.