Inter (Part-II) Multan Board 2016
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.

• ______ has the largest Brogile wavelength at same speed.

(A) Proton
(B) α-particle
(C) Carbon Atom
(D) Electron

• The number of Neutrons in ²³⁸ ₉₂ U is:-

(A) 92
(B) 238
(C) 146
(D) 330

• Production of X-rays is the reverse process of :-

(A) Compton effect
(B) Pair production
(C) Pair annihilation
(D) Photo electric effect

• Fission chain reaction is controlled by:-

(A) Cadmium rods
(B) Iron rods
(C) Platinum rods
(D) Steel rods

• One joule is equal to:-

(A) 1.6x10^-19 eV
(B) 1.6x 10¹⁹ eV
(C) 6.25x 10^-18 eV
(D) 6.25x10¹⁸ eV

• Capacitance of parallel plate capacitor is :-

(A) ϵ_°d/A
(B) ϵ_°A/d
(C) A/ϵ_°d
(D) d/ϵ_°A

• Three 1 ohm resistors are connected to form a triangle, the resistance between any two corners is:-

(A) 2/3Ω
(B) 3/2Ω
(C) 1/2Ω
(D) 3Ω

• An electrons enters the magnetic field at right angle from left, B is into paper. The electrons will be directed:-

(A) Upward
(B) Towards right
(C) Downward
(D) Towards left

• ______ is correct relation.

(A) 1T=10⁴ G 
(B) 1T=10-⁴ G
(C) 1T=10^-2 G
(D) 1T=10² G

• The self inductance of solenoid is :-

(A) L=µ_°n A ℓ
(B) L=µ_° N ² A ℓ
(C) L=µ_° n ² A ℓ
(D) L=µ_° N ²A ℓ

• Lenz’s law is in accordance with law of conservation of:-

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

• At resonance frequency, the impedance of RLC- Parallel Circuit is :-

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

• In R-L-C circuit, the energy is dissipated in :-

(A) R only
(B) R and L
(C) R and C
(D) R,L and C

• To get N-type, the Ge is doped with:-

(A) Aluminum
(B) Arsenic
(C) Boron
(D) Indium

• The thickness of the base of the transistor is of the order of:-

(A) 10⁶ m
(B) 10^-6 m
(C) 10^-3 m
(D) 10-⁶ µ m

• The range of F.M transmission frequencies is form:-

(A) 540 KHz to 1600 KHz
(B) 88 KHz to 108 KHz
(C) 88 MHz to 108 MHz
(D) 540 MHz to 1600

• The Photons approach each other, their relative speed will be:-

(A) 2C
(B) Zero
(C) Less than C
(D) C

Inter (Part-II) Multan Board 2016
Physics
Part II (Subjective)
Time Allowed: 2.10 Hours 
Max. Marks: 83 

Section I

2. Attempt any eight parts. 8x2=16

• Verify that an ohm times farad is equivalent to second.
• Electric lines of force never cross. Why?
• Show that 1 Volt/1meter = 1 Newton/1 Coulomb
• The potential is constent throughout a given region of space. Is the electrical field zero or non-zero in this region? Explain.
• What is the function of Grid in a Cathode Ray Oscilloscope?
• Why the voltmeter should have a very high resistance?
• Why does a picture on a T.V screen become distorted, when a magnet is brought near the screen?
• What do you mean by current sensitivity of a galvanometer?
• State Farady’s Law. Also write its mathematical expression.
• Show that ϵ and ∆ᶲ/∆1 have the same units.
• Does the induced emf always act to decrease the magnetic flux through a circuit? Explain.
• How the efficiency of a transformer can be improved?

3. Attempt any Eight parts. 8x2=16

• Is the filament resistance lower or higher in a 500W. 220V light bulb than in a 100W, 220V bulb?
• Why does the resistance of a conductor rise with temperature?
• State Kirchhoff’s First Rule.
• How does doubling the frequency effect the reaction of (a) an inductor (b) a capacitor?
• Define Instantaneous Value and Peak Value of Current.
• How many times per second will an incandescent lamp reach maximum brilliance when connected to a 50 Hz source?
• What is elasticity and Plasticity?
• Distinguish between intrinsic and extrinsic Semi-conductor.
• Define (i) unit cell (ii) crystal lattice
• Why charge carries are not present in the depletion region?
• Why ordinary silicon does not emit light?
• Why a Photodiode is operated in reserve biased state?

4. Attempt any six parts. 6x2=12

• What advantages an electron microscope has over an optical microscope?
• Why don’t observe a Compton effect with Visible light?
• Photon A has twice the energy of Photon B. What is the ratio of the momentum of A to that of B?
• Define lionization and Excitation Potential.
• Give any two uses of laser in Medicine.
• What is meant by population Inversion and Lasing Action?
• How can radioactivity help in the treatment of Cancer?
• A particle which produces more lionization is less penetrating. Why?
• What factors make a fusion reaction difficult to achieve?

SECTION-II (Essay Type)

NOTE:- Attempt any three questions 8x3=24

Question #5
(a) Derive the expression for energy stored in a charged capacitor. Also calculate the energy and energy density stored in the electric filed. 5
(b) A Platinum write has resistance of 10Ω at 0°C and 20Ωat 273°C. 3

Question #6
(a) What is transformer? Describe its principle, construction and working of Transformer.5
(b) A power line 10.0m high carries a current 200A. Find the magnetic field of the wire at gound.3

Question #7
(a) What is energy Band theory? How it can be used to explain different features of electrical conductors, insulators and semiconductors. 5
(b) What is the resonant frequency of a circuit which includes a coil of inductance. 2.5H and capacitance of 40µF 3

Question #8
(a) What is Uncertainty Principle? Explain it. 5
(b) In a certain circuit, the transistors has a collector current of 10 m A and base current of 40µ A. What is the current gain of the transistor? 3

Question #9
(a) Describe Isotopes. Describe Aston’s mass spectrograph and how it can be used to separate the isotopes of an element? 5
(b) Calculate the longest wave length of radiation for the Paschen series. 3

SECTION-III(PRACTICAL)

(a) Give answers to any four 4x2=8

• What is equivalent Resistance in case of in Parallel combination?
• What is the unit of Potential difference? Define it.
• Why we use Weston type moving coil galvanometer?
• What is the difference between emf and Terminal Potential Difference?
• Do the filament of lighted bulb obey Ohm’s law or not? Explain.
• Draw the circuit diagram to compare the emf of two cells by using Potnetiometer.
• Draw symbol and truth table of AND Gate.
• What is meant by wok function? Write its unit

 (b) Write down the procedure of experiment to find the resistance of a wire by slide wire bridge.
OR
Write down the procedure of experiment to study the characteristics of a semi-condutor diode.

(c) Answer down the question given below on the basis of the following graph.

Graph-A
(i) What do you infer from the graph?
(ii) Find slope of graph . 4

Graph-B
(i) What do you infer from the graph?
(ii) Find the resistance of galvanometer.

(images)