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Physics mock paper I 2016-17

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Udayan Sathe
Mumbai University (MU), Mumbai
Msc and M.Ed physics

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Physics mock paper I 2016-17 Section I Question 1 a) Find the weight of a body of mass 15 kg. Also, calculate the force acting on it. b) Explain, how two agents doing the same work have different powers. c) What is the function of the split ring in a d.c. motor ? d) What is the effect on the kinetic energy of a moving car if (i) mass is doubled. (ii) its velocity is halved ? e) Draw a labeled diagram to illustrate the working of an optical fibre and mention two uses. Question 2 a) Give the difference between forced vibration and resonance. b) Why is it not advisable to wear damp clothes ? c) The specific latent heat of fusion of lead is 5.9 kcal/kg. A block of lead at its melting point needs 177 kcal of heat for complete melting. What is the mass of the lead ? d) list the factors and how they effect the internal resistance of a cell. e) Water in an electric kettle connected to a 220 V supply took 5 minutes to reach its boiling point. How long would it have taken if the supply had been of 200 V ? Question 3 a) Give the principle of operation of a D.C. motor. Also, state the energy changes that take place in it. b) Name the process responsible for the energy generation in the sun. Give a representative equation for this process. c) State two differences each between a D.C moter and an A.C. generator. d) i) Write specific heat capacity of water. ii) 1 calorie is equal to _______. e) What are damped vibrations ? Question 4 a) In a three pin plug, how would you identify the earth pin ? In which connecting wire should a switch be connected ? b) List the radiations in the order of their increasing frequencies, which make up the complete electromagnetic spectrum. c) A 9 volt battery has a capacity of giving 60 amperes of current for 1 hour. How long can the battery keep a 60 W lamp on ? d) State the factors on which the heat absorbed by a body depends. e) What are thermionic emissions ? Section II (Answer any four questions)

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