Gujrawala Board 2012
Physics Paper-II
(Objective)
Inter (Part-II)
Time: 20 Minutes 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 with marker or pen on the answer book provided. Cutting or filling two or more circles will result in zero mark in that question. Attempt as many questions as given in objective type question paper and leave other blank.

• Dimension of strain are

(a) L²                                            
(b) L^-2
(c)  ML^-1T^-2                               
(d) no dimension

• If is the peak value of an AC supply, then its rms vaue as

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

• When a motor is just stared, back mf is almost

(a) maximum
(b) zero
(c) minimum
(d) infinite

• A sample contains N radioactive nuclei . After 4 half lines number of nuclei decayed is

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

• Atomic specutra are the examples of ________________ spectra

(a) continuous
(b) line
(c) band
(d) mix

• the coordinate system in which law of inertia is valid is called

(a) special frame of reference
(b) inertial frame of reference
(c) non-inertial frame of reference
(d) standard frame of reference

• When a silicon crystal is doped with a pentavalent elements, it becomes:

(a) p-type semiconductor
(b) n-type semiconductor
(c) intrinsic semiconductor
(d) extrinsic semiconductor

• Resonating frequency of RLC series circuit is =______

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

• Magentic force on a moving charged partile is perpendicular to the______________

(a) magnetic field
(b)electric filed
(c) velocity of the particle
(d) magnetic field and velocity of the particle

• Turn ration of a transform is 50. If 220 V Ac is applied to its primary coil, voltage n the secondary coil will be

(a) 44 V
(b) 4.4 V
(c) 220 V
(d) 1100 V

• The increase in capacitance of a capacitor due to presence of dielectric is due to ______of dielectric

(a) electric polarization
(b) electrification
(c) ionization
(d) electrolysis

• When -particle is emitted from any nuleus, its mass number ______and its charge number__________

(a) increases by 2, increases by 2
(b)decreases by 4, increase by 2
(c) decreases by 4, decreases by 2
(d) decreases by 4, decreases by 4

• Maximum kinetic energy of photoelectrons depends upon________of incident light

(a) frequency
(b) intensity
(c) brightness
(d) power

• A particle having 2 e charge falls through a potential difference of 5.V Energy acquired by it is __________

(a) 2.5 e V
(b) 20 e V
(c) 0.4 e V
(d) 10 e V

• Resistance of a voltmeter should be _______ as compared to the resistance across which it is connected

(a) high
(b)very high
(c) low
(d) very low

• _______ is the electrical symbol for

(a) dide
(b) photodiode
(c) photocell
(d) LED

• The ‘emf’ is always ___________ even when no current is drawn through the battery or cell

(a) zero
(b) present
(c) absent
(d) maximum

Inter (Part-II)
Gujrawala Board 2012
Physics Paper-II
Time: 2:40 Hours
Marks: 68

(Section-I)

2. Write short answers to any EIGHT questions: (2×8=16)

• Define electron volt.
• Do electrons tend to go to region of high potential of low potential?
• Suppose that you follow an electric field line due to a positive point charge. Do electric field line and the potential increase or decrease?
• What is conventional current?
• Write the formulas for series and parallel combinations of resistors?
• What are the difficulties in testing whether the filament of a lighted bulb obyers Ohm’s law?
• What is Lorenzts force?
• How can you use a magnetic field to separate isotopes of chemical elements?
• Is it possible to orient a current loop in a uniform magnetic field such that the loop will not tend to rotate? Explain.
• How wouild you position a flat loop of wire in a changing magnetic field so that there is no emf induced in the loop?
• Can a D.C motor be turned into a D.C generator? What changes are required to be done?
• Show that have the same units.

3. Write short answers to any EIGHT questions: (2×8=16)

• What is D.C motor? write its principle
• How does doubling the frequency affect the reactance of (a) capacitor (b) inductor
• Write three characteristics’ of series resonance circuit.
• A sinusoildal current has rms value of 10 A. what is the macimum value?
• Differentiate between ‘elastic deformation’ and ‘plastic deformation’
• What are super conductor? Write two uses of super conductors
• Define ‘Coercice current’
• The base current in a transistor is very small. Why?
• What is the effect of forward and reverse biasing of diode on the width of depletion region?
• What is photo diode? Write its two application?
• Will higher frequency light eject greater number of electrons than low frequency light?
• Is it possible to creat a single electrn from energy? Explain

4. Write short answers to any SIX questions: (2×6=12)

• Differentiate between photo electronic effect and Compton effect
• If p and =V.e then prove that
• Give two advantf=ges of LASER over ordinary light
• Write any two postulates of Bohr’s model of H-atom
• What is the energy of quanta in eV having wavelength
• Briefly give the uses of (a) Wilson Cloud Chamber (b) G.M Counter
• What is radioactive trace? Give its one application wach in industry and medicine.
• What factors makes a fusion reaction difficult to achieve?
• What is meant by critical mass?

(Sectiom-II)

5.(a) define resistivity and explain its dependence upon temperature. Also derive a relation for temperature co-efficient in terms of resistivity .
(b) in Bohr’s atomic model of hydrogen atom, the electron is in an orbit around the nuclear proton at a distance of with a speed of ms find
(i) electric potential that a proton exerts at this distance
(ii) the ionization energy for the atom is eV

6.(a) describe the principle, construction and working of a moving coil galvanometer
(b) a square coil of side 16 cm has 200 turns and rotates in a magnetic fields of magnitude 0.05 T. if the peak emf is 12 V, what is the angular celocity of the coil?

7.(a) explain the principle of generation, transmission amd reception of electromagnetic waves with an example.
(b) A 1.0 , long copper wire is subjected to stretching force and its length increase by 20cm. calculate the tensil strain and percentage elongation which the wire undergoes.

8.(a) What us transistor and hhow is it used as an amplifier? Give its circuit diagram,. Deduce the relation for its voltage gain.
(b) What is the energy of a photon in a beam of infrared radiations having wavelength 1240 nm?

9.(a) what are C-rays? How are they produced?
(b) The half life of an isotope is 9.70 hours. Find its decay constant.