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PHYSICS SA II Q.1.) Displacement distance graph of two sounds A and B are as given below and travelling in a medium 80 MARKS (2) Study the two types of sound waves and compare their : a.) Amplitude b.) Wavelengths Q.2.) a.) What do you understand by the term nuclear fusion? (2) b.) Nuclear power plants use nuclear fission reaction to produce electricity. What is the advantage of producing electricity by fusion reaction? Q.3.) a. What do you understand by free vibrations of a body? b. Why does the amplitude of a vibrating body continuously decrease during damped vibrations? (2) Q.4.) a. How is the c.m.f. across primary and secondary coils of a transformer related with the number of turns of coil in them ? (2) b. On which type of current do transformers work? Q.5.) a. What are isobars ? Give one example of isobars. (2) Q.6.) State any two advantages of electromagnets over permanent magnets. (2) Q.7.) The The diagram shows a coil wound around a U shape soft iron bar AB. (a) What is the polarity induced at the ends A and B when the switch is pressed ? (b) Suggest one way to strengthen the magnetic field in the electromagnet. (c) What will be the polarities at A& B if the direction of current is reversed in the circuit ? (3)
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