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

Note: Section-A is compulsory and comprises pages 1-2. All parts of this section are to be answered on the question paper itself. It should be completed in the first 25 minutes and handed over to the Centre Superintendent. Deleting/overwriting is not allowed. Do not use lead pencil.

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

• At rearesonance frequency the impedance of RLC series circuit

(a) Zero
(b) Minimum
(c) Maximum
(d) Moderate

• A device which conerts electrical energy to mechanical energy is called:

(a) Transformer
(b) AC generator
(c) DC motor
(d) DC generator

• Energy stored in inductor is:

(a) 1/2 LI²
(b) 1/2 LI
(c) 1/2 L²I
(d) 1/2 L²I²

• The value of permeability of free space in SI unit is:

(a) 4π x 10^-9 wba^-1m^-1
(b) 4π x 10^-7 wba^-1m^-1
(c) 4π x 10^-10 wba^-1m^-1
(d) 4π x 10⁷ wba^-1m^-1

• The unit of E is NC^-1 and that of B is NA^-1m^-1 then the unit of E/B is:

(a) ms^-2
(b) ms
(c) m^-1s^-1
(d) ms^-1

• Kirchhoff's first rule is the manifestakion of the law of conservation of:

(a) Mass
(b) Charge
(c) Energy
(d) Momentum

• If the potential difference across two plates of a capacitor is doubled, then energy stored in it will be:

(a) Two times
(b) Eight times
(c) Four times
(d) Remains same

• Photo copier and inkjet printer are the application of:

(a) Magn_ptism
(b) Electricity
(c) Electro magnetism
(d) Electra statics

• The amount of energy equivalent to 1 i, .0 is

(a) 931.5 MeV
(b) 93.15 MeV
(c) 9.315 MeV
(d) 2.224 MeV

• γ rays emitted from radiocative element have speed:

(a) 1 x 10⁷ms^-1
(b) 1 x 10⁹ms^-1
(c) 3 x 10^-8 ms^-1
(d) 4 x 9⁹ms^-1

• Which series lies in tell ultraviolet region?

(a) Balmer series
(b) Bracket series
(c) Pitmd series
(d) Lyman series

• In the metastable State the atoms can reside for:

(a) 10³ S
(b) 10^-3 S
(c) 10^-8 S
(d) 10⁸ S

• Platinum wire becomes yellow at a temperature of?

(a) 900°C
(b) 1300°C
(c) 1600⁰C
(d) 500⁰C .

• The potential barrier for germanium is:

(a) 3.0V
(b) 0.3V
(c) 7V
(d) 0.7V

• A device used for the conversion of AC into DC is called:

(a) An oscillator
(b) Detector
(c) Anamplifier
(d) Rectifier

• Good conductors have conductivies of the order of:

(a) 10^-7 ( Ωm)^-1
(b) 10⁷ ( Ωm)^-1
(c) 10 ² ( Ωm)^-1
(d) 10^-2 ( Ωm)^-1

• Resistance of choke is:

(a) Zero
(b) Large
(c) Very small
(d) infinite

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

Section I

2. Attempt any EIGHT short questions. (8X2 =16)

• Do electrons tends to go to region of high potential or of potential?
• Electric lines of force never cross, Why?
• How can you identify that which plate of a capacitor is positively charged?
• Verify that an Ohm times Farad is equivalent to second.
• How can you use a magnetic field to separate isotopes of chemical element'?
• Why does the picture on a TV screen become distorted when a magnetic is brought near the screen?
• Why the resistance of an ammeter should be very low?
• What is stable galvanometer?
• Can a DC motor -be turned into a DC generator? What changes are required to be done?
• Show that єand have same units.
• Does the induced emf always act to decrease the magnetic flux through the circuit'?
• How the power losses can be minimized in a transformer?

3. Attempt any EIGHT short questions. (8X2 =16)

• An ordinary bulb is marked 61 watts 200 volts. What is its resistance?
• Why does the resistance or a conductor rise with temperature?
• Do bends in a wire affect its electrical resistance?
• Describe the type of modulation.
• How the reception of particular radio station is selected on your radio set?
• How many tines per second will an inductance lamp reach maximum brilliance when connected to a 50Hz source ?t
• Distinguish between a valence band and conduction band.
• Define the modulus of elasticity, Show that units of modulus of elasticity and stress are the same.
• Distinguish between crystalline amorphous and polymeric solids.
• What is the mathematical expression of AND gate? Write its truth table.
• Why teh charge carriers are not present in depletion region?
• Write' some important uses of operational amplifier.

4. Attempt any SIX short questions. (6 X 4 = 12)

• What are teh measurements on which to Observers in relative motion will always agree upon?
• Which has the lower energy quanta, radio waves or x-rays?
• Why do not we observe a Compton effect with visible light?
• Is energy conserved when an atom emits a photon of light?
• What are the advantages of laser over ordinary light?
• Why are heavy 'lucid unstable'?
• What is teh relation between decay constant and half life (T_1/2) of a radioactive element ?
• A particle which produces more ionization is less penetrating. Why?
• What do you mean by the term critical mass?

SECTION II

Attempt any THREE questions. (8X 3 24)

Question #5
(a) What is wheat stone bridge? How it is used to determine the unknown resistance?
(b) A particle having :1-iarge of 20 electrons on it falls through a potential difference of 100 volts, calculate the energy .acquired by it in electron Volt.

Question #6
(a)Define motional eml and derive a relation .for it.
(b) Alpha particles ranging in speeds from 1000ms- to 2000ms' enter a velocity selectro, where the electric intensity is 300vm' and magnetic induction is 0.20T. Which particle will move undeviated through the filed.

Question #7
(a)Define impedance'. Discuss alternating current through RL, series circuit

(b) A1.25cm diameter cylinder is subjected to a load of 2500kg. Calculate the stress on the bar in mega pascals.

Question #8
(a)Write down teh postulates of special theory of relativity and also describe the four results of special theory of relativity.
(b) Tile current flowing into base of a transistor is 100A. Find its ratio if the value of current gain is 100

Question #9
(a)What is nuclear reactor? Explain different pans of a power reactor.
(b) Calculate the longest wavelength of radiation for teh Paschen series.

SECTION III

Attempt any THREE questions.

Question #10.(a)

• Give the relation of resistance of galvanometer by half 'deflection method.
• Draw a circuit diagram for the experiment in which you can prove current is proportional to the capacitance.
• What is meant by forward biased and revere biased?
• State Ohm's law. Give one example of nonohmic device,
• Draw symbol and truth table of NOT gate.
• Do the filament of bighted bulb obey Ohm's law or not?
• Draw the characteristics for semiconductor when it is reverse biased and forward biased.
• To convert a galvanometer into ammeter a low resistance is connected. How this resistance is connected? Illustrate with circuit diagram.

(b) Write down the procedure of the experiment to find the resistance by slide wire bridge.
OR
Write down the procedure experiment by which you can prove photo current is directly proportional to the intensity of light..

(c) Answer the questions given under the graph:

(A) Graph is plotted between voltage and current passing through a resistor.

• Find the slope of graph.
• Which quantity is measured by slope?

OR

(B) Graph is plotted between resistance and time period of flashes.

• Find the slope of graph.
• Find the resistance for which time period is 7 seconds.