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St. Francis Xavier School Rehearsal Examination(2018-19) Subject Physics Class X Time 2hrs F.M. 80 Answer of this paper must be written on the paper provided separately. You will NOT be allowed to write during the first 15 minutes. This time is to be spent in reading the question paper. The time given at the head of this paper is the time allowed for writing the answers. Section I is compulsory. Attempt any four questions from Section II. The intended marks for questions or parts of questions are given in brackets [ ] Section I (40 MARKS) (Attempt all questions) Question 1: [2 x 5 = 10] a) A body of mass 1kg falls from a height of 5m. How much energy does it posses at any moment?( g =9.8m/s2) b) What is the effect of pressure on the boiling point of a liquid? c) A water pump can raise 20kg of water through a height of 10 m in 10 s. What is the total work done by the pump?[g=10m/s2] d) What are damped vibrations? e) What are naturally radioactive elements? Question 2: [2 x 5 = 10] a) 8000J of heat is given to 200g of copper at 20 C. What is the final temperature if the specific heat capacity of copper is 0.4J/g C? b) Two resistances of 3ohms and 2 ohms are connected across a 1.5 volt battery. Calculate the current in the main circuit, when the resistances are (i) in series, (ii) in parallel. c) What is an electric switch? What are its types? Describe a two way staircase switch. d) Draw a diagram of a step up transformer. e) Describe briefly the structure of an atomic nucleus. Give one example. Question 3: [2 x 5 = 10] a) Why water is not used in car radiators? b) The speed of light is 3 x 108 m/s. Calculate the frequency of yellow light of wavelength 6 x 10-7 m. 1
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