Bahawlapur   Board    2012   
Physics
Inter Part-II
Time:20 minutes 
Group-II
Marks:17
OBJECTIVE TYPE

Note: Write answers to the questions on the objective answer sheet provided. Four A,B,C and D to each question are given with answer is correct, fill the relevant circle with pen ink to each question on the answer sheet provided.

Q.no.1

• Unit of Strength of Electric Field is:

(a) Joule/Coulomb
(b) Coulomb/Volt
(c) Volt/m
(d) None of these

• Under the action of electric field, molecules of a dielectic:

(a) Begin to Vibrate
(b) Become electric dipole
(c) Are Ionized
(d) Are Charged

• If fourth on a carbon resistor is of silver colour then its tolerance is:

(a)
(b)
(c)
(d)

• Unit of Magnetic Flux is:

(a) Weber
(b) Gauss
(c) Tesla
(d) Ampere/m²

• The high resistance R that should be connected in series with a Gavanometer of Resistance Rg to convert it into a voltmeter of range 0-v volts is given by:

(a) V/Ig+RG
(b) Ig/V-RG
(c) IgRg/V-Ig
(d) V/Ig-RG

• If an inductor has N turns of a coil and  is Magnetic Flux through its each turn when current I is flowing in it, then its self inductance is given by:
  

(a) I/N
(b) N/I
(c) NI/
(d)

• The maximum value of emf induced in armature of N turns and area A rotating in magnetic field B with frequency “f” is given by:

(a) 2
(b) 2
(c) NfAB
(d) 4f²NAB

• The power disspated in A.C Circuits is given by P= Irms Vrms Cos is called:

(a) Phase factor
(b) Gain factor
(c) Loss factor
(d) Power factor

• In a choke of inductance L and resistance R:

(a) L is Large and R is small
(b) L is small and R is large
(c) Both L and R are large
(d) Both L and R small

• The number of atoms is domains of Macroscopic size of a ferromagnetic substance are:

(a) 10⁴ to 10⁶
(b) 10⁶  to 10⁸
(c) 10¹² to 10¹⁶
(d) 10²¹to 10²³

• If IE, IB and Ic are emitter current, base current and collector current respectively in a translation then:

(a) IC=IB-IE
(b) IB= IC - IE
(c) IE= IB – IC
(d) IC= IE+ IB

• The term inertor is used for :

(a) Nor gate
(b) NAND gate
(c) XNOR gate
(d) NOT gate

• Momentum of a photon is given by:

(a) hf/λ
(b) hf/c
(c) F λ
(d) h λ

• Compton effect is observed with:

(a) X-Rays
(b) Visible Light
(c) Radio Waves
(d) All these

• If an electron jumps nth orbit of energy En to pth (lower) orbit of energy Ep and a photon of frequency “f”and wavelength “λ” is thus emitted then:

(a) f λ = En – Ep
(b) hc/ λ= En – Ep
(c) hf= Ep – En
(d) h λ= Ep – En

• Colour Television (while operating) emits U nucleus absorbs a fast neutron and is ultimately transformed into ……..by emitting two b β particals:

(a)
(b)
(c)
(d)

Bahawlapur Board 2012 
Physics 
Inter Part-II
Time: 2: 40 hours
Group-II
Marks:68
(SUBJECTIVE  TYPE

Note: It is compulsory to attempt (8) parts each from Q.no.2 and 3 while attempt 6 parts from Q. no.4 and attempt any (03) questions from part-II. Write same questions

Q.No2 :

• Show that N/C + V/m
• Describes force or forces on a positive point charge when placed between parallel plates on opposite and equal charge.
• Do Electron tend to move to the region of low potential or high potential?
• What are none-Ohmic Conductors? Give two examples.
• Do bends in the wire affects its electrical resistance? Explain.
• Draw a labeled diagram Wheatstone Bridge?
• Define flux Density. What are its units?
• Define the change in magnetic field inside a solenoid carrying steady current 1 if the number of turns is doubled but the length remains same.
• Is it possible to orient a current carrying loop in a uniform magnetic field such that the loop will not tend to rotate? Explain.
• Define Self or Mutual Inductance and write their equations.
• How the power is lost due to eddy current in a transformer and how this loss can be minimized?
• How would you position a flat loop of fire in a changing magnetic field so that there is no emf induced in the loop?

Q No.3

• Define electromagnetic Induction.
• How does doubling the frequency affect the reactance of an inductor and a capacitor?
• What is Choke?
• In RL circuit, will the current lags or lead the voltage? Illustrate your answer by vector diagram.
• Briefly explain conductor on the basis of Band Theory.
• What is Doping?
• What is meant by Hysteresis Loss?
• Why transistor has 1c = 10mA and 1B = 40 A. Calculate current gain of transistor.
• Why ordinary silicon Diodes emit light?
• Why is the base current in a transistor very small?
• Write down the least four application of Photo Cell.
• What advantages an electron microscope has over an optical microscope?

Q No.4

• What is Photon? Drive the relation between Momentum of Photon and Wavelength of Light?
• Give two forms of Uncertainty Principle. Writes its one alppication.
• Differentiate between Characteristics X-rays Continous X-rays.
• What do we mean when we say that the Atom excited?
• Is energy conserved when an atoms emits a photon of light? Explain.
• What do you understand by Background Radiation? State two sources of this radiation.
• What fraction of a Radioactive Sample decays after two half lives have clasped?
• How “Meson” and “Baryon” can be constructed by “Quarks”?
• How α and β Partcels may ionize an atom without directly hitting the electrons? Explain.

Part-II

Q No.5 (a) What is capacitor? Give its unit. Evaluate the capacitance of parallel plate capacitor having dielectric between its plates.         (5)
(b) The resistance of an iron core at 0o C is 1x10⁴ Ohms. What is the resistance at 5000c if the temperature coefficient of resistance of iron is 5.2 x 10^-3K^-1  (3) 

Q.No.6 (a) Drive a relation of energy stored in an inductor and industry density. (5)
(b) Find the radius of an orbit of an electron moving at a rate of 2.0 x m/s in a uniform magnetic field of 1.20 x 10^-3T  (3)

Q.No.7 (a) Explain the series RLC circuit connected to an ac input and determine its resonance frequency. What other features does this circuit show at resonance? (5)
(b) The length of a steel wire is 1.0 m and its cross sectional area is 0.03 x10^-4 m². Calculated the wark done in stretching the wire when a force of 100 N is applied in the elastic region. Young’s Modulus of steel is 3.0 x 10¹¹ Nm^-2 (3)

Q.No.8 (a) Define and explain Photo Electric Effect and determine maximum Kinetic Energy of Photo Electrons. What are the experimental results PhotoElectric Effect? (5)
(b) The current flowing into the base of transistor is 100կA. Find its collector current Ic and emitter current IE? (β = 100)          (3)

Q.No.9 (a) What is the Laser? Describe its principle and operation. Give its two uses in daily life.        (5)
(b) Determine the energy associate with the given reaction : C      N +
Give mass of   C =14.008918 U ,  N = 14.0067 U   e = 0.000548 U       (3)