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THE CATHEDRAL AND JOHN CONNON SCHOOL PRELIMINARY EXAMINATION STD X Physics 2017-2018 DATE: 9/1/2018 TIME-2 hours MAX MARKS:80 SECTION 1 (40 MARKS) Attempt ALL questions in this section. Take g =10 N/kg wherever needed. Question 1. a. b. c. d. e. Two bodies of mass m1 and m2 have the same linear momentum. What is the ratio of their kinetic energies? [2] A train ls travelling on a level track at a speed of 72 km/hr. It is pulled by an engine which exerts force of 12,000 N. Calculate the power of the engine in kilowatt. [2] The moment of a force of 6N about a point is 3 Nm. Calculate the distance of the point of application of the force from the point. [2] What is the relationship between: (i) VR, Distance moved by load (d1) and the distance moved by the effort (d 2) (ii) VR, MA, and efficiency ( ) [2] How can he mechanical advantage of a lever be increased ? [2] Question 2 a. b. c. d. e. Explain the difference between optically denser medium and optically rare medium. [2] Name the color of light which is deviated (i) the most, (ii) the least, on passing through a prism. [2] (i) Name a natural phenomenon which is a result of the contrast between the specific heat capacities of land and water (ii) Give an example where water is used as a coolant [2] The wavelength of a normal wave is 66 m. Calculate the frequency of the wave, if the velocity of sound is 330m/s. Would this sound be audible to the human ear? [2] How do you tune your radio-set to a particular station? Name the phenomenon involved in doing so. [2] Question 3 a. b. c. d. e. Define resistance and resistivity. [2] A bulb is joined to a battery of e.m.f.6 V. A steady current of 0.5A flows through the circuit. Calculate the total energy provided by the battery in 5 minutes. [2] Write down a fission reaction [2] Write two properties of beta radiations [2] An alpha particle captures (i) one electron, (ii) two electrons. ln each case, what does it change to? [2] Question 4 a. b. c. d. Draw a displacement-time graph for damped vibrations. State 2 was by which the pitch of a stringed instrument can be lowered? State 2 differences between an electro-magnet and bar magnet. A hot solid of mass 60g at 100oC is placed in 100g of water at 18C. The final steady temperature recorded is 20oC. Find the specific heat capacity of the solid. [2] [2] [2] [2]
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