Physics  (Objective)                         
(Group-I)                                
Paper(II)      
TIME:20 Hours                                
Paper Code 4471       
Maximum Marks: 17

NOTE: You have four choices of objective type questions as  A , B , C, 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. Attempt as many questions as given in objective type question paper and leave others lank. Write the letter A , B , C, or D in the column
(write correct option) against each question. If there is a contradiction in the bubble and hand written answer, bubble option will be considered correct.

• Coulomb per volt is called

(A) Farad
(B) Ampere
(C) Joule
(D) Ohm

• 1 Joule =
  

(A) 6.25 x10¹⁸ e.v 
(B) 6.25 x 10^-18
(C) 1.6 x 10^-19 e.v
(D) 9.1 x 10^-31e.v

• The terminal potential difference of a battery difference of ab battery of internal resistance “r” and emf “ɛ” is
  

(A) V= ɛ+Ir                                  
(B) V= ɛ+Ir
(C) V= ɛ+r/I                                 
(D) I/ ɛ-r

• The magnetic field inside a long solenoid , when current “I” passed through it will be
  

(A) Weak 
(B) Strong
(C) Zero
(D) Ist strong then weak

• Force on a moving charge in a uniform magnetic field will be maximum, when the angle between ̅V and ̅B is
  

(A) 00 
(B) 900
(C) 1200
(D) 1800

• The energy stored per unit volume in side a solenoid is calculated by
  

(A) ½ B2/μ0 (AI)
(B) ½ B2/μ0
(C) ½ μ0/B2(AI)
(D) ½ μ0/B2

• The S.I units of induced emf is
  

(A) Ohm 
(B) Tesla
(C) Henry 
(D) Volt

•  A device that allows only the flow of D.C. through a circuit is
  

(A) Inductor 
(B) Capacitor
(C) A.C generator 
(D) Transformer

•  The phase difference between each pair of coils of a three phase A.C. generator is
  

(A) 00 
(B) 900
(C) 1200
(D) 1800

• The band in atom containing conductive electrons, according to “band theory of solids” is
  

(A) Conduction band
(B) Valence band
(C) Forbidden band 
(D) First conduction band hen forbidden band

• A diode characteristics curve is a graph plotted between
  

(A) Current and time
(B) Voltage and time
(C) Voltage and time
(D) Forward voltage  and reverse current

• The output of “AND” gate will be one (I), when
  

(A) Both inputs are at zero (0)
(B) Either one input are at one(I)
(C) Voltage and time
(D) None of them

• The rest mass of photon is
  

(A) Infinity
(B) Zero
(C) hf
(D) mc²

• A maximum Compton shift in the wavelength of scattered photon will be occur at
  

(A) Ѳ=00
(B) Ѳ=450  
(C) Ѳ=900
(D) Ѳ=1800

• The quantized radius of first Bohr Orbit of a hydrogen atom is
  

(A) 0.053 nm (0)
(B) 0.0053 nm(I)
(C) 0.00053 nm
(D) 0.53 nm

• An α- Particle contains

(A) “I” proton and “I”  neutron 
(B) “2” proton and “2”  neutrons 
(C) “3” proton and “3”  neutrons
(D) “4” protons and 4 neutrons

• Which of the following belong to “hadrons” group
  

(A) Proton
(B) Electron
(C) Muons
(D) Neutrines

Physics  (Subjective)
(Group-I)
Paper(II)      
TimeAllowed:2.40 minutes
Maximum Marks: 68

2.Write short answer of any eight parts. (8x2=16)

• Write the dimension of (a)pressure (b) Force
• Can you add zero to a null vector?
• If ̅A+ ̅B = 0,what can you say about the components of two vectors? 
• Explain first and second conditions of equilibrium.
• By using the formula ,show that the range of projectile is maximum , when projectile is thrown at an angle at 45°  with the horizontal.
• Explain the circumstances in which the velocity ̅V and acceleration  ̅a of a Car are (a) Anti parallel     (b) Perpendicular to one another    
• Can the velocity of an object reverse the direction when acceleration is constant? If so, give an example.
• List the possible energy changes when a girl drops a cup from a certain height, which breaks into pieces.
• What is power? How it is related with velocity. Explain.
• Calculate the work done in Kilo Joules when when 10 Kg Crate is pushed through 4 m across the floor with a force of 50 N.

2: Answer briefly any EIGHT parts from the followings     ( 8x2=16)

• When mud flies off the tyre of a moving bicycle, in what direction does it fly? Explain.
• Show that orbital angular momentum L0 =mvr
• The Earth’s satellites, being gravity free system , are freely falling in space , do not reach the earth. Explain why?
• What do you understand by the term viscosity?
• Differentiate between stream line and irregular flow of fluids.
• Two row boats moving parallel in the same direction are pulled towards each other.Explain.
• Give any two applications of resonance.
• Can we realize an ideal simple pendulum.
• Name two characteristics of simple harmonic motion.
• Explain why sound travels faster in warm air than in cold air.
• How are beats useful in tuning musical instruments?
• State principle of super position of waves.

4. Answer briefly any SIX parts from the followings     ( 6x2=12)

• What is Diffraction Grating?
• Under what conditions two OR move sources of lightbehave as Coherent Source.
• Why the Polaroid Sunglasses are better thn ordinary Sunglasses?
• Define Angular magnification.
• What do you understand  by linear magnification ? Explain how a Convex lens is used as a magnifier?
• How the light signal is transmitted through the optical fibre? 
• State two postulates of Kinetic theory of gases.
• Why is the average velocity of the molecules in a gas Zero but the Average of the Square of Velocities is Not Zero?
• Is it possible to convert internal Energy into mechanical energy? Explain with an example.

Section----II

Note : Attempt any three questions.       (8x3=24)

5.(a) Define Scalar Product, Explain its four characteristics.         1+4
(b) A 1500 Kg Car has its velocity reduced from 20ms^-1 to 15 ms^-1  in 3s.How large was the average retarding force.                    3

6.(a) What is meant by centripetal force. Derive relations for centripetal force and centripetal acceleration.                                         5
(b) Ten bricks each 6 cm thick and mass 1.5 kg ,lie flat on a table.How much work is required to stake them on the top of another.    3

7.(a) What is Carnot engine.Discuss Carnot Cycle.Find out efficiency of Carnot engine.                                                                    1+2+2
(b) How large must a heating duct be if air moving 3.0 m/s along it can replenish the air in a room of 300 m3 volume every 15 mint. Assuming the air density remains constant. 3              

8.(a) What is Simple Harmonic motion , show that motion of mass,m, attached to a spring of spring constant K, is SHM. System is considered to be friction less.                    5
(b) An organ pipe has a length of 50 cm. find the frequency of its fundamental note when it is closed at on end.

9.(a) What is thin films? Explain the construction and working of michelson’s interferometer.                                                                                                       1+2+2         
(b) A telescope is made of an objective of focal length 20 cm and an eye piece of 5.0 cm,both convex lenses. Find the angular magnification and length of the telescope in normal adjustment.                                              

Physics  (Subjective)
(Group-I)
Paper(II)
TimeAllowed:2.40 minutes   
Maximum Marks: 68

2.Write short answer of any eight parts. (8x2=16)

• Give the statement of guass’s law and write down its mathematical form
• Electric lines of forces never cross.Why?
• When and electron falls through a P.D of 10.0 volt Find its energy in electron-volts.
• Do the bend in wire affect the electrical resistance? Justify your answer mathematically
• Why the reistance of conductor rise with temperature?
• Differentiate between resistance and resistivity give their unit.
• How can you use magnetic field to separate the isotopes of a chemical element?
• Briefly give the function of cathode ,grid and plates in G.R.O.
• What is Lorentz force?Give the role of electric and magnetic force in this regard.
• Show that ɛ and ΔΦ/Δt have same units.
• Does the induced e.m.f. always act to decrease the magnetic flux through a circuit?
• How the “eddy currents ” are produced? What are their affect on transformer working?

 3.Write short answer of any eight parts.                                                           (8x2=16)

• State Leuz’s law.
• A sinusoidal current has nns value of 10 A. What is the maximum or peak value?
• How many times per second will an incandescent lamp reach maximum brilliance when connected to a 50HZ source?
• What is meant by A.M. and F.M?
• What is meant by Hystereis loss?
• What is meant by critical temperature?Also give the value of critical temperature for alumin.
• What are polymeric solids?
• Why is the base current in a transistor very small?
• Why a photo diode is operated in reverse biased state ?
• Give the circuit diagram and truth table of Exclusive –OR gate?
• Photon A has twice the energy of Photon B.What is the ratio of the momentum of A to that of B?
• WCan pair production takes place in vacuum? Explain.

4.Write short answer of any eight parts. (6x2=12)

• What is a photocell? Write its two uses.
• Define photoelectric effect. Write the two results from the experiment of photoelectric effect.
• What do we mean when we say that the atom is excited?
• What are the advantages of lasers over ordinary light?
• Define excitation energy and ionization energy.
• A particle which produces more ionization is less penetrating. why?
• What factors make a fusion reaction difficult to achieve?
• what bare “thermal reactors”.
• Define mass defect and binding energy.
  

SECTION………..II

NOTE: attempt any three questions.

5.(a)  Define electric flux. Derive the expression  for electric flux through surface enclosing a charge q.                                                                                                  1+4
(b)  A platinum wire has resistance of 10 Ω at 0º C and 20 Ω at 273º C. find the value of temperature coefficient of resistance of platinum  3

6.(a)  Define lorentz force. Determine the e/m of an electron.                                 5
(b)   A.D.C motor operates at 240 V and has a resistance of 0.5 ohm. When the motor is running at normal speed, the armature current is 15 A . find the back emf.        3

7.(a)  Describe a series R.C   circuit connected to an ac source. Determine the phase relation between current and voltage and find its impedence.               5
(b) What stress would cause a wire to increase in length by 0.01% if the Young’s modules of the wire is 12x10 pa? 3

8.(a)  Describe the Broglie hypothesis and explain its confirmation through Davisson and Germer experiment.                                                                                   
(b)  In a certain circuit , the transistor has a collector current of 10 m a and a base current of 40 μ A. What is the current gain of the transistor and its emitter current?          3

9. (a) What is laser? Discuss population inversion and laser action.               1+2+2=5
(b) A 75 kg person reeives a whole body radiation dose of 24 m rad, delivered by α-particles for which RBE factor is 12.
Calculate (a) The absorbed energy in joules and (b) the equivqlent dose in rem 3