Solved question paper for PHY May-2018 (DIPLOMA electronics and communication engineering 1st-2nd)

Physics

Previous year question paper with solutions for Physics May-2018

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Question paper 1

  1. SECTION-A

    Q1. a) Fill in the blanks.

    i. The dimensional formula of energy is ----------------.

    Answer:

  2. ii. Number of fundamental and base units in S.I system is---------------.

    Answer:

  3. iii. A temperature of 100 C is equal to-------------- on Kelvin scale.

    Answer:

  4. iv. Momentum is the product of mass and -----------.

    Answer:

  5. v. Sound is a --------- wave.

    Answer:

  6. b) State True or False.

    vi. Rolling is a combination of rotational and translation motion.

    Answer:

  7. vii. Friction can be reduced to zero.

    Answer:

  8. viii. One Fermi is equal to 10-15m

    Answer:

  9. ix. Air is heated by radiation.

    Answer:

  10. x. Angular velocity is defined as rate of change of displacement of a body.

    Answer:

  11. c) Multiple Choices.

    i. The significant figures in 96.000 are

    a) 3 b) 4 c) 5 d) 6

    Answer:

  12. ii. Rate of change of Momentum is directly proportional to

    a) Force b) Displacement c) Acceleration d) Velocity

    Answer:

  13. iii. Ultrasonic waves are produced by

    a) Piezo electrical oscillator b) Coloumb’s law c) Doppler’s effect d) Gauss’s law

    Answer:

  14. 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.

    Answer:

  15. v. The velocity of sound is maximum in

    a) Air b) Vaccum c) Steel d) Water

    Answer:

  16. SECTION-B

    Q2. Attempt any six questions.

    a. Convert 1 Newton of force into dyne using dimensional analysis

    Answer:

  17. b. Differentiate between Echo and Reverberation time.

    Answer:

  18. c. Define Crest, trough, wavelength, compression and rarefaction.

    Answer:

  19. d. State different modulus of elasticity.

    Answer:

  20. e. Differentiate between scalar and vector quantities.

    Answer:

  21. f. Explain coefficient of viscosity and give its unit.

    Answer:

  22. g. What are the different modes of transfer of heat?

    Answer:

  23. h. Define pressure and give its units.

    Answer:

  24. SECTION-C

    Attempt any three questions.

    Q3. State and explain law of conservation of energy.

    Answer:

  25. 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.

    Answer:

  26. 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

    Answer:

  27. 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.

    Answer:

  28. Q7. State and explain Newton’s laws of motion.

    Answer:

Question paper 2

  1. SECTION-A

    Q1. a) Fill in the blanks.

    i. Relative permittivity of air is……………

    Answer:

  2. ii. Frequency of direct current is…………………

    Answer:

  3. iii. ………… mirror is used as a rear view mirror in vehicles.

    Answer:

  4. iv. Output of He-Ne laser is a …………… wave.

    Answer:

  5. v. ………. are majority carriers in p-type semiconductor.

    Answer:

  6. b) State True or False.

    vi. Dielectrics decrease the capacity of parallel plate capacitor.

    Answer:

  7. vii. EMF is the difference of potential between two electrodes in open circuit.

    Answer:

  8. viii. In a microscope, focal length of objective lens is greater than eye-piece.

    Answer:

  9. ix. Total internal reflection (TIR) is used in optical fibers.

    Answer:

  10. x. Zener diode is used in stabilizing the circuits

    Answer:

  11. 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.

    Answer:

  12. ii. Electric lines of force at positive point charge are

    a. circular anti-clockwise b. radial outward c. circular clockwise d. radial inward

    Answer:

  13. 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

    Answer:

  14. 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

    Answer:

  15. v. LASER is based on the principle of

    a. total internal reflection b. refraction c. population inversion d. spontaneous emission

    Answer:

  16. 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.

    Answer:

  17. b. What is total internal reflection (TIR)? Explain one of its applications.

    Answer:

  18. c. Write the properties of electric lines of force.

    Answer:

  19. d. What are the differences between EMF and potential difference of a cell?

    Answer:

  20. e. State Lenz’s laws in electromagnetic induction.

    Answer:

  21. f. State Kirchoffs laws.

    Answer:

  22. g. What is depletion layer in p-n junction?

    Answer:

  23. h. What is population inversion?

    Answer:

  24. SECTION-C

    Attempt any three questions.

    Q3. State and prove Gauss law.

    Answer:

  25. Q4. Derive lens formula for thin convex lens in case of real image.

    Answer:

  26. 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?

    Answer:

  27. Q6. Explain principle, construction and working of moving coil galvanometer.

    Answer:

  28. Q7. a) Differentiate between n-type and p-type semiconductors.

     

    Answer:

  29. b) What is Ruby laser? Explain its working with diagram.

    Answer: