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Physics 2008 Set 3

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PREVIOUS YEAR PAPERS CBSE BOARD EXAM AIEEE BITSAT ISAT VITEEE IIT-JEE STUDY MATERIAL PHYSICS CLASS XI XII SAMPLE PAPERS KEY SOLUTIONS ANSWERS QUESTIONS

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									2/3/2011                                         Subjective Test Paper - Physics - Meritn…




  Physics 2008 Set 3                                                                             Close


 Subjective Test




     These are additional set 3 questions.



    Question 1 ( 1.0 marks)
   Name the absorbing material used to control the reaction rate of neutrons in a nuclear reactor.


    Question 2 ( 1.0 marks)
   State the reason why two independent sources of light cannot be considered as coherent sources.


    Question 7 ( 1.0 marks)
   How does the power of a convex lens vary, if the incident red light is replaced by violet light?


    Question 9 ( 2.0 marks)
   Draw a ray diagram of a compound microscope. Write the expression for its magnifying power.


    Question 12 ( 2.0 marks)
   If the output of a 2 input NOR gate is fed as both inputs A and B to another NOR gate, write down a
   truth table to find the final output, for all combinations of A, B.


    Question 15 ( 2.0 marks)
   The oscillating electric field of an electromagnetic wave is given by:




   (a) Obtain the value of the wavelength of the electro-magnetic wave.

   (b) Write down the expression for the oscillating magnetic field.


    Question 24 ( 3.0 marks)
   An inductor of unknown value, a capacitor of 100 µF and a resistor of 10       are connected in series to
   a 200 V, 50 Hz a.c source. It is found that the power factor of the circuit is unity. Calculate the
   inductance of the inductor and the current amplitude.


    Question 25 ( 3.0 marks)
   Define resistivity of a conductor. Plot a graph showing the variation of resistivity with temperature
   for a metallic conductor. How does one explain such a behaviour using the mathematical expression
   of the resistivity of a material?




meritnation.com/…/lB3G9SvjKfsOSzNI4q…                                                                          1/1

								
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