SSLC PHYSICS 2018 Answer key 1. Humidity, temperature/ wind / density 2. Solar cell, Solar cooker / Solar water heater 3. Voice Coil 5. Yellow. Others are Primary colours/ yellow is a secondary colour 6. a. Conductors having Low melting Point b. The amperage of the fuse wire Must be increased 7. a. D= V x t /2 = 340 x2/2 = 340m b. Persistence of audibility 8. a. LED b. Photo diode. LED emit light . Photo diode absorb light 9. Primary winding with thin wire current flowing at higher voltage Secondary winding with thick wire current flowing at low voltage 10. a. H=I2 Rt. When resistance is decreased heat produced can be minimised. b. When voltage is increased Current can be decreased and heat produced can be minimised. 11 a. To avoid spark b. Permanent magnet will loose its magnetism gradually c. To get three AC of different Phase. 12. a. M – diode N – Resistor / Output load resister / output b (i) Centre Tap Transformer (ii) 2 c. Fig 7.11 of page 127 13. a. Evaporation b. High specific heat capacity of water c. High Latent heat of fusion of ice 14. a. B1 & B2 b. B3 & B4 c. Resistance can be reduced and each appliance can be controlled separately. 15. a. Morning b. Fig 6.4 page 105 16. a. Increase / Vary b. 512 Hz. Resonance. When the natural frequency of the body undergoing vibration is equal to that of the influencing body, loud sound can be heard. 17. a. difference in specific heat capacity b. Water c. Lead 18. a. I= V/R = 230/115 = 2A b. P= VI = 230 *2=460 W

c. H= P*t = 460* 10*60=276000 J 19. a. Infrared b. Violet c. Ultraviolet – Vitamin D , Skin Cancer Infrared – Distant photography, Makes sunlight Hot. 20.a. Solid – Coal Liquid – Petrol b. Coal c. Formed by the decomposition of plants and animals, buried under the earth millions of years ago, in the absence of oxygen , under high pressure and temperature . Prepared by sajith Punalur for science thought

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