Physics
Previous year question paper with solutions for Physics May-2018
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Question paper 1
SECTION-A
Q1. a) Fill in the blanks.
i. The dimensional formula of energy is ----------------.
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ii. Number of fundamental and base units in S.I system is---------------.
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iii. A temperature of 100 C is equal to-------------- on Kelvin scale.
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iv. Momentum is the product of mass and -----------.
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v. Sound is a --------- wave.
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b) State True or False.
vi. Rolling is a combination of rotational and translation motion.
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vii. Friction can be reduced to zero.
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viii. One Fermi is equal to 10-15m
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ix. Air is heated by radiation.
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x. Angular velocity is defined as rate of change of displacement of a body.
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c) Multiple Choices.
i. The significant figures in 96.000 are
a) 3 b) 4 c) 5 d) 6
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ii. Rate of change of Momentum is directly proportional to
a) Force b) Displacement c) Acceleration d) Velocity
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iii. Ultrasonic waves are produced by
a) Piezo electrical oscillator b) Coloumb’s law c) Doppler’s effect d) Gauss’s law
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iv. Action & Reaction do not balance each other because they
a) Act on same body b) Do not act on same body c) Are in opposite direction d) Are not equal.
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v. The velocity of sound is maximum in
a) Air b) Vaccum c) Steel d) Water
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SECTION-B
Q2. Attempt any six questions.
a. Convert 1 Newton of force into dyne using dimensional analysis
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b. Differentiate between Echo and Reverberation time.
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c. Define Crest, trough, wavelength, compression and rarefaction.
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d. State different modulus of elasticity.
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e. Differentiate between scalar and vector quantities.
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f. Explain coefficient of viscosity and give its unit.
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g. What are the different modes of transfer of heat?
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h. Define pressure and give its units.
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SECTION-C
Attempt any three questions.
Q3. State and explain law of conservation of energy.
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Q4. a) Define Friction, give its unit and explain laws of friction.
b) A fly wheel of radius 42cm is revolving with a speed of 120r.p.m. Find its angular and linear velocities.
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Q5. a) Define free, forced and resonant vibrations
b) Melting point of gold is 10630 C. Find its value in degree Fahrenheit and degree Kelvin
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Q6. a) Check the correctness of the relation t = \(2 \pi \sqrt ({l \over g})\) where t is time period of pendulum , l is length and g is acceleration due to gravity. b) Explain different system of units.
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Q7. State and explain Newton’s laws of motion.
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Question paper 2
SECTION-A
Q1. a) Fill in the blanks.
i. Relative permittivity of air is……………
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ii. Frequency of direct current is…………………
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iii. ………… mirror is used as a rear view mirror in vehicles.
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iv. Output of He-Ne laser is a …………… wave.
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v. ………. are majority carriers in p-type semiconductor.
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b) State True or False.
vi. Dielectrics decrease the capacity of parallel plate capacitor.
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vii. EMF is the difference of potential between two electrodes in open circuit.
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viii. In a microscope, focal length of objective lens is greater than eye-piece.
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ix. Total internal reflection (TIR) is used in optical fibers.
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x. Zener diode is used in stabilizing the circuits
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c) Multiple choice questions.
i. A well cut diamond appears bright due to
a. It emits bright light b. scattering of light c . total internal reflection d. it emits luminous particles.
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ii. Electric lines of force at positive point charge are
a. circular anti-clockwise b. radial outward c. circular clockwise d. radial inward
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iii. Two resistances of 9 Ω and 18 Ω are connected in series. Equivalent resistance is
a. 20 Ω b. 27 Ω c. 9 Ω d. 2 Ω
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iv. To increase the range of an ammeter, we used to connect a suitable
a. low resistance in parallel b. low resistance in series c. high resistance in parallel d. high resistance in series
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v. LASER is based on the principle of
a. total internal reflection b. refraction c. population inversion d. spontaneous emission
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Q2. Attempt any six questions.
a. An object is placed at 35 cm from a concave mirror of focal length 70 cm. Determine the position and nature of image formed.
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b. What is total internal reflection (TIR)? Explain one of its applications.
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c. Write the properties of electric lines of force.
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d. What are the differences between EMF and potential difference of a cell?
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e. State Lenz’s laws in electromagnetic induction.
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f. State Kirchoffs laws.
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g. What is depletion layer in p-n junction?
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h. What is population inversion?
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SECTION-C
Attempt any three questions.
Q3. State and prove Gauss law.
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Q4. Derive lens formula for thin convex lens in case of real image.
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Q5. a) 3 equal resistances are arranged in series and then they are arranged in parallel. Find out the ratio of Rs/Rp where Rs is equivalent resistance in series and Rp is equivalent resistance in parallel
b) State Ohm’s law. What is the effect of temperature on resistance of conductor?
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Q6. Explain principle, construction and working of moving coil galvanometer.
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Q7. a) Differentiate between n-type and p-type semiconductors.
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b) What is Ruby laser? Explain its working with diagram.
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