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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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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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