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Posted Date: 13 Apr 2008 Posted By: ashish singh Member Level: Gold
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2007 Tilka Manjhi Bhagalpur University B.Sc Physics PHY SUB Question paper
COPYRIGHT RESERVED AA(H-1)PHY
2007
Time: 3 hours
Full marks: 50
PHYSICS SUB/GEN
Answer five questions.Selecting at least one from Group B and C Group-A is compulsory
GROUP-A
1. Indicate the correct answer in the following:
(a) Which of the following is not a magnetic property?
(1)permeability (2) Susceptibility (3) Hysteresis(4)resistivity
b) if p is the polarization of a dielectric slap, then
1)p=1 2)p=2 3)p=3 4)p=4
c ) the unit of peltier coefficient is
(1)joule per coulomp per Kelvin (2) joule per Kelvin
(3) joule per coulomp (4) joule per coulomb2
(d)the time constant of a circuit is the time in which current decays by
(1) 25 % (2) 37% (3) 50% (4) 63%
(e)the alternating current through an inductance
(1) lags behind the voltage in phase by an angle pie
(2) leads the voltage in phase by and angle pie
(3) lags behind the voltage in phase by an angle by and angle 90.
(4)Leads the voltage in phase by an angle 90.
(f) curie is the unit of radioactivity which is equal to
(1) one disintegration per second (2) 3.7 * 10 ^10 disintergration per
Second
(3)10 ^6 disintegration per second (4) 10 ^4 disintergration per second
(g) Electron volt is the unit of
(1) charge (2) potential defference (3) current (4) energy
(h) in younger sit experiment,if distance between slits is halvaed and
distance between slits screen is doubled ,the fringe width becomes
(1) half (2) double (3) four times (4) eight times
(i) Maxwell,s electromamagnetic theory of light suggests that the lighit
consists of oscillations of
(1)magnetic vector alone (2)electric vector alone
(3) electric and magnetic vectors parallel to each other
GROUP-B
2 Explain the phenomena of electric polarization of a dielectric substance
What do you mean by electric intensity,electric polarization and electric
Displacement for a medium ? find the relation between them
3 (a) What is curie point ? Magnetic behaviour of magnetic substances decreases
With increasing temperature.comment
(b) Why ferromagnetism is found in solids only and not in fluids?
4 Give the construction of moving coil ballistic bavanometer and deduce the
Formula the quality of electricity flowing through it. State the condition under which it is (a) ballistic and (b) dead beat
5 give an account of the theory of radioactive disintegration. Explain the term half-life time of a radioactive atom. Deduce an expression for the half-time of a radioactive substance in terms of it’s a radioactive constant.
GROUP-C
6 What do you by diffraction of light? Discuss diffraction at a single slit.
How is the width of center maximum changed when-
(a)slit width is decreased (b) the distance between slit and screen
increased?
7 State Maxwell’s equation for uniform plane electromagnetic waves in free space (vacuum)
8 How does Bohr’s theory of hydrogen atom explain the different series of spectral lines of hydrogen?
Draw energy level diagram.Give the limitation of Bohr’s atomic model.
9 What od you understand by polarization of light? How would you produce and detect plane, circularly and elliptically polarized lights?
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