Tuesday, December 1, 2015
S.B. Roll No………
Duration: 3 Hrs. Max. Marks: 75\
Q1. (A) Fill in the blanks:
a. One dioptre is the power of a lens of one metre…………..
b. ………… is the unit of capacitance.
c. When the temperature of metallic conductor is increased, its resistance always ………….
d. The permeability of ………… material is less than one.
e. Signal is transmitted through optical fibre in the form of……….
(B) Choose the correct one:
i. For which colour, the focal length of a convex lens is more?
(a) red (c)yellow
ii. One coulombs is the point charge which when placed at one metre from art equal and similar point charge in vacuum repels it with a force.
(a)9x109 dyne (c)1 dyne
iii. Conductance is thereciprocal of
(a) Current (c) Current density
(b) Resistance (d)Resistivity
iv. A charge is moving parallel to a magnetic field. Force acting on it is
(a) Q v/B (c)q/Bv
(b) Q B/v (d)Zero
v. Population inversion in helium-neon laser is produced by
(c)in elastic atomic collisions
(C) Match the following:
i. Magnification of
ii. Capacitance of
parallel plate capacitor
(b) qv x B
iii. Slide wrie bridge c) Population inversion
iv. magnetic force d) 1+D/f
v. pumping e) resistance
Note: Attempt any six questions:
Q2. i. Discuss the laws of refraction and reflection.
ii. A reflecting type telescope has a large mirror of its objective of focal length of 100cm. What is the magnifying power of the telescope, if the eye piece has a focal length of 10cm?
iii. What are the functions of dielectric?
iv. State Ohm’s law and give its mathematical form.
v. What are magnetic lines of force? State their properties.
vi. A conductor 100cm long carries a current of 100A at right angles to a uniform magnetic field of 1 wb/m2. Calculate ther force and power required to move the conductor at speed of 10 m/s in a plane at right angles to the magnetic field.
vii. Discuss the atomic structure of germanium.
viii. What do you mean by three level laser? Explain.
Note: Attempt any three questions:
Q3. a. Show that when a plane mirror is rotated through an angle, the reflected rays turn through twice the angle.
b. Calculate the magnifying power of a simple microscope of focal length 5 cm. Distance of distinct vision is 25cm.
Q4. a. Find equivalent capacitance when three capacitors are conecncted in parallel.
b. What must be the capacitance of capacitor which is to store a charge of 0.01 coulomb when the potential difference is 500 volts.
Q5. a. Find the equivalent resistance when three resistance are connected in parallel.
b. An incandescent lamp draws a current of 0.3 A at 240 volt. Find the resistance of lamp.
Q6. Explain how a galvanometer can be converted in to an ammeter. Why an ammeter is always connected in series.
Q7. a. Explain with the hep of diagram fullwave bridge rectifier in detail.
b. Find the distance of an unknown object from the earth, if laser beam take 5 second to return after reflection from it.
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