Physics
Previous year question paper with solutions for Physics Dec-2017
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Question paper 1
SECTION-A
Q1. a) Fill in the blanks.
i. Field inside a spherical shell of uniform charge density is _________
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ii. The field of view of a ________ mirror is maximum.
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iii. A convex lens has a focal length of 10 cm., then its magnifying power is ________
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iv. The electric Kirchhoff ’s second law is based on the law of conservation of _________
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v. Refractive index of Cladding is_______ than refractive index of core in an optical fiber.
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b) State True or False.
vi. Total internal reflection will not take place, when light ray travels from denser to rarer medium.
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vii. Electric potential is a vector quantity.
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viii. The capacitance of a parallel plate capacitor increases by the introduction of a dielectric slab between its plates.
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ix. Two parallel conductors carrying currents in opposite direction will attract each other.
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x. In a transistor, the collector-base junction must be reverse biased.
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Q2. Multiple Choice Questions.
i. The focal length of a concave lens is 20 cm. What is its power?
(a) + 20 D (b) – 20 D (c) – 5 D (d) + 5 D
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ii. The capacitance of a parallel plate capacitor does not depend upon the
(a) Material of the plates (b) Medium between the plates (c) Area of the plates (d) distance between the plates
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iii. Kilo watt hour is the unit used for measuring
(a) Electric current (b) Electric Power (c) Electric Potential (d) Electric Energy
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iv. Fleming’s Right Hand rule is applied to find the direction of?
(a) Electric field (b) Current (c) Magnetic field (d) Magnetic force
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v. Laser is based on the principle of
(a) Stimulated absorption (b) Spontaneous emission (c) Stimulated emission (d) all of above
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SECTION-B
Q2. Attempt any six questions.
a. A needle placed 45 cm from a lens, forms an image on a screen placed 90 cm on the other side of the lens. Identify the type of lens and determine its focal length. What will be the size of the image, if the size of needle is 5.0 cm?
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b. Derive an expression for electric field intensity due to a charged straight conductor.
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c. Explain how will you convert a galvanometer into a voltmeter
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d. What is three level laser and four level laser? Explain with diagrams.
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e. Explain the effect of temperature on the conductivity of intrinsic semi conductors.
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f. Why the width of depletion layer decreases on forwarding biasing of pn-junction diode.
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g. What are single-mode and multi-mode optical fibers? Explain with diagrams.
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h. Define the following :
(a) Knee Voltage (b) depletion Region (c) Potential barrier
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SECTION-C
ttempt any three questions.
Q3. What is astronomical telescope? Explain its construction and working. Find an expression for its magnifying power.
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Q4. What is Wheat stone bridge principle? Explain with diagram how it is used to calculate unknown resistance?
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Q5. Explain full- wave bridge rectifier working with circuit and wave diagrams in detail.
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Q6. a) What is optical fiber? Explain various applications of optical fibers.
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b) What is doping? How extrinsic semi-conductors are made with doping?
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Q7. a) What is principle of a parallel plate capacitor? Describe the various factors affecting the capacity of a capacitor? Explain
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b) Differentiate between paramagnetic, diamagnetic and ferromagnetic materials.
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