Veer Narmad South Gujarat University 2011-1st Year B.Sc Physics SB-0621 - 2 - Question Paper
[Total Marks : 70
First Year B. Sc. Examination
March / April - 2011
Physics : Paper - II
SB-0621
Time : 3 Hours] :
"x Seat No.:
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Name of the Examination :
F. Y. B. Sc.
Name of the Subject:
Physics : Paper - 2
Student's Signature
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-Section No. (1,2......): Nil |
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ENGLISH VERSION
Instructions : (1) As per the instruction no. 1 of page no. 1.
(2) Students can use non-programmable scientific calculator wherever necessary.
(3) The symbols used in the question paper have their usual meanings.
(4) The numbers to the right indicate full marks carried by the question.
1 Answer in brief : 10
(i) Define : Solenoidal vector field.
(ii) State coulomb's law.
(iii) In an EL circuit, L = 0.5H and R = lk<l Calculate the time constant of the circuit.
(iv) An electron in moving at 20 m/ s in a magnetic field of 0.5T parallel to it. How much force will act on it due to the magnetic field ?
(e = 1.6 x 10-19C)
(v) What is the value of PIV in the case of full-wave bridge rectifier ?
(vi) Draw the circuit symbol of an NPN transistor.
(vii) Give truth table of NOT gate.
(viii) State the principle of the moving coil galvanometer.
(ix) What will be the power of a concave lens having focal length 50cm ?
(x) In a Young's experiment, how much will be the path difference between the two waves at a point on the screen where third bright fringe is obtained ? Wavelength of the light used in the experiment is 6000A
(a) Define divergence of vector field and explain it 8 with an example.
(b) Prove that grad r = 2r , where r represents 4 position vector of a particle.
(a) Define electric field intensity. 7 Prove that electric field is a conserved field on the basis
of the law of conservation of energy.
(b) Calculate the value of elecrostatic potential at a 5
point at a distance of 14.4A0 from the charge
1.6 x 10-19C. Also calculate potential difference between the points at the distances of 14.4A0 and 12.4A0 from the charge. (k = 9xlOMKS)
(a) Draw LCR dc series circuit. Derive the differential 8 equation for the circuit during the charging of the capacitor in it. Also obtain the solution of this differential equation.
(b) In an LCR dc series circuit, L = 0.4H and 4 C = 0. l|iF. Obtain the value of the required maximum resistance for the circuit to be oscillatory.
(a) State Ampere's circuital law. Using it, derive an 8 expression for magnetic induction, due to a current carrying straight conductor of infinite length, at a point
at a distance r from it.
(b) 30A and 60A currents are passing, respectively, 4 through two very long straight conductors kept at the separation of 50cm from each other. Find the force per unit length acting between them. Also state the type of this force.
4 (a) Define filter circuits and discuss their importance in 8 brief during the process of rectification.
Explain ty filter with necessary circuit.
(b) For a zener diode, the breakdown voltage is 15V 4
and its power rating is 0.5W. What is the minimum value of the series resistance required to use it with a 50V dc supply ?
4 (a) Explain the working of biased clipper circuit with 7
necessary figure.
(b) Draw the circuit symbols of LED and photo-diode.
Give three points of difference between them.
5 (a) Draw the circuit for obtaining the static 8
characteristics of a transistor in the CE configuration. Drawing its output characteristics, explain various parts of it.
(b) State the logic of NOR gate and prepare the truth 4 table for a two-input NOR gate. Draw its circuit symbol also. The inputs of a two-input NOR gate are joined with each other. It will behave as which type of gate now ?
5 (a) Prove tangent's law for a tangent galvanometer. 8
Derive an expression for the sensitivity of the tangent galvanometer. From that, discuss how its sensitivity can be increased.
(b) 1A current is passing through the tangent 4
galvanometer prepared by winding 10 turns of a conducting wire on a circular frame of radius txcm. Calculate the value of magnetic induction produced at the center of the coil.
6 (a) Derive an expression for the focal length of a thick 7
lens placed in air.
(b) The radius of curvature of the curved surface of a 5 plano-convex lens having refractive index 1.5 and thickness 2.25cm is 8cm. Show the cardinal points of this lens in the figure.
6 (a) Derive an expression for the resultant amplitude in 7 the case of multiple reflections of light from a thin film,
(b) The radii of the 8th and 14th rings obtained in a 5 Newton's rings experiment using sodium source are 0.172cm and 0.284cm respectively. Find the radius of curvature of the curved surface of the plano-convex lens
used in the experiment. (\ = 5890A).
SB-0621] 7 [ 3700 ]
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| Earning: Approval pending. |
