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HSC Physics- 2nd Paper (Theo) Model Question-2


HSC Physics- 2nd Paper (Theo) Model Question for Class- XII
 
      1  a.  What is point charge?  Derive the equation for the capacitance of a parallel plate capacitor.   1+4=    5
    b. What is electrolysis?   State and explain Faraday’s laws of electrolysis                                               6
    c. The length of a meter bridge wire is 1m. A standard resistor of 12Ω. is placed in its left gap
and an unknown resistor is placed on the right  gap. A null point is found at 37.5cm from
the end. Calculate the unknown resistance.                                                                                           4
Or,
    a.  State the laws of resistance and from it define specific resistance.                                                       5   
    b   What is inversion temperature? How can the resistance of a wire be measured by a meter
bridge?- Explain.                                                                                                                        1+5=    6                                                                                                            
    c.  Which one will use more energy- a television of 250watt used for 1hr. or an electric iron of 1
200watt. used for 10 min.?                                                                                                                    4

2. a. Define conjugate foci. For a thin spherical lens prove that,                     1+5=    6              
here the symbols refer their traditional meaning.
    b   By drawing rays of path describe the working principle of a compound microscope and derive
the equation of its magnification.                                                                                                          5
    c.  A person having defective vision cannot see object beyond 5m.and cannot see object less
than a distance of 0.5m. Lenses of what power are to be used to see object at long distance
and for reading.                                                                                                                                     4
Or,
 a.    Define critical angle. Show that the refractive index of the denser medium with respect to the
rarer medium is equal to the inverse of the critical angle between them.                                  1+5=    6
     b Establish the relation between refractive index, actual depth and apparent depth if the object is
in the denser medium.                                                                                                                            5
     c In front of a concave mirror of focal length of f an object at a distance of 3f from the mirror.
Show that the size of the image will be half of the size of the object.                                                  4

3.  a What is LASER? Discuss the failures of classical mechanics in explaining the black body
radiation.                                                                                                                                    1+5=    6
     b. Show that N= Ne- where the symbols have their usual meaning.                                                 5
     c In a common base transistor the collect current is 0.85mA. and the base current is 0.05mA.
Calculate current amplification factor.                                                                                                  4
Or,
     a. Derive the equation for the radius of electron of hydrogen atom according to Bohr’s atom model.    6
     b. Draw a circuit diagram for a full wave rectifier and describe its working principal.                            5
     c. If the total energy of a moving particle is 2.5 times the stationary energy. What is the speed
 of the particle?                                                                                                                                      4
4.      Prove that the energy stored per unit volume at a point inside a capacitor,     U=                  5
               Or,
     a     Mention the fundamental postulates of Bohr’s atom                                                                         3
     b. Prove that the equivalent capacitance of 4 capacitors of equal values when connected in series
is 1/16 times the equivalent capacitance when connected in parallel.                                                   2

5.      Describe the electrical method for the determination of mechanical equivalent of heat by
Joule’s Calorimeter.                                                                                                                               5
Or,
What is Peltier effect? If the electro chemical equivalent of silver is 1.118×10-6kg.C-1. and atomic mass of  silver is 108. Calculate the E.C.E. of Hydrogen.                                                                       1+4=    5
6.     Show that the flux density at a nearby point of a long wire carrying current, B =     1+4=    5
Or,
    a. What is called Tesla?                                                                                                                               1
    b. The diameter of a circular coil is 31.4×10-2m and its number of terns is 400. For what amount of current
        flow in the coil, the magnetic field at the centre of the coil will be 4×10-10wb.m-2                                           4

7.      What is light year? In Fizeau’s experiment the velocity of light was found  3×108m.s-1 . if the number of the teeth of the wheel was 720 and frequency 10.8 Hz. Find the distance between the wheel and the mirror.                                                                                                                               1+4 =   5
Or,
    a. For a thin prism show that the deviation,  A, where the symbols have their usual
        meaning.                                                                                                                                                  2
    b. A convex lens of focal length of 0.25m. is in contact with a concave lens of focal length of 0.75m.
        Determine the equivalent focal length of the combination.                                                                    3

8.     Prove that,   m =                                                                                                                       5
Or ,
    a. What are the postulates of special theory of relativity?                                                                          2
    b. If an electron moves with .99C speed.  Find its moving mass.                                                              3                                              

9.     Establish the mass-energy equation of Einstein.                                                                                     5
Or,
    a. What is plasma state?                                                                                                                              1
    b. The decay constant of radioactive substance is 3.75×10s.  Calculate   the half life.                      4
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