Friday, December 20, 2019

Physics 2012 DSE - 2075 Words

Ã¥  ªÃ©â„¢ Ã©â€" ±Ã¥  ·Ã¥â€œ ¡Ã¥ Æ'éâ€" ± FOR MARKERS’ USE ONLY May 4, 2012 é ¦â„¢Ã¦ ¸ ¯Ã¨â‚¬Æ'è © ¦Ã¥ Å Ã¨ ©â€¢Ã¦   ¸Ã¥ ±â‚¬ HONG KONG EXAMINATIONS AND ASSESSMENT AUTHORITY 2012 Ã¥ ¹ ´Ã© ¦â„¢Ã¦ ¸ ¯Ã¤ ¸ ­Ã¥ ­ ¸Ã¦â€"‡æ†‘è€Æ'è © ¦ HONG KONG DIPLOMA OF SECONDARY EDUCATION EXAMINATION 2012 ç‰ ©Ã§ â€  é ¦â„¢Ã¦ ¸ ¯Ã¤ ¸ ­Ã¥ ­ ¸Ã¦â€"‡æ†‘è€Æ'è © ¦ è © ¦Ã¥  ·Ã¤ ¸â‚¬Ã¤ ¹â„¢ PHYSICS HKDSE PAPER 1B æÅ" ¬Ã¨ ©â€¢Ã¥  ·Ã¥ Æ'è€Æ'ä ¹Æ'è€Æ'è ©â€¢Ã¥ ±â‚¬Ã¥ °Ë†Ã§â€š ºÃ¤ »Å Ã¥ ¹ ´Ã¦Å" ¬Ã§ §â€˜Ã¨â‚¬Æ'è © ¦Ã¨â‚¬Å'ç · ¨Ã¥ ¯ «Ã¯ ¼Å'ä ¾â€ºÃ©â€" ±Ã¥  ·Ã¥â€œ ¡Ã¥ Æ'è€Æ' ä ¹â€¹Ã§â€ ¨Ã£â‚¬â€šÃ©â€" ±Ã¥  ·Ã¥â€œ ¡Ã¥Å" ¨Ã¥ ®Å'æˆ Ã©â€" ±Ã¥  ·Ã¥ · ¥Ã¤ ½Å"Ã¥ ¾Å'ï ¼Å'è‹ ¥Ã¥ °â€¡Ã¦Å" ¬Ã¨ ©â€¢Ã¥  ·Ã¥ Æ'è€Æ'æ  Ã¤ ¾â€ºÃ¥â€¦ ¶Ã¤ » »Ã¦â€¢â„¢ æÅ"Æ'è€Æ'ç  ­Ã§Å¡â€žÃ¦Å" ¬Ã§ §â€˜Ã¥ Å'ä ºâ€¹Ã¥ Æ'éâ€" ±Ã¯ ¼Å'æÅ" ¬Ã¥ ±â‚¬Ã¤ ¸ Ã¨ ¡ ¨Ã¥  Ã¥ ° Ã¯ ¼Å'ä ½â€ Ã©  Ë†Ã¥Ë†â€¡Ã¨ ¨ËœÃ¯ ¼Å'Ã¥Å" ¨Ã¤ » »Ã¤ ½â€¢Ã¦Æ'… æ ³ Ã¤ ¸â€¹Ã¥ â€¡Ã¤ ¸ Ã¥ ¾â€"Ã¥ ® ¹Ã¨ ¨ ±Ã¦Å" ¬Ã¨ ©â€¢Ã¥  ·Ã¥ Æ'è€Æ'è  ½Ã¥â€¦ ¥Ã¥ ­ ¸Ã§â€Å¸Ã¦â€°â€¹Ã¤ ¸ ­Ã£â‚¬â€šÃ¥ ­ ¸Ã§â€Å¸Ã¨â€¹ ¥Ã§ ´ ¢Ã©â€" ±Ã¦Ë†â€"æ ±â€šÃ¥ â€" æ ­ ¤Ã§ ­â€°Ã¦â€"‡ä » ¶Ã¯ ¼Å'éâ€" ±Ã¥  ·Ã¥â€œ ¡/æ•™å ¸ «Ã¦â€¡â€°Ã¥Å¡ ´Ã¨ ©Å¾Ã¦â€¹â€™Ã§ µâ€¢Ã¯ ¼Å'å›  Ã¥ ­ ¸Ã§â€Å¸Ã¦ ¥ µÃ¥  ¯Ã¨Æ' ½Ã¥ °â€¡Ã¨ ©â€¢Ã¥  ·Ã¥ Æ' è€Æ'è ¦â€"ç‚ ºÃ¦ ¨â„¢Ã¦ ºâ€"ç ­â€Ã¦ ¡Ë†Ã¯ ¼Å'ä » ¥Ã¨â€¡ ´Ã¤ ½â€ Ã§Å¸ ¥Ã§ ¡ ¬Ã¨Æ'Å'æ ­ »Ã¨ ¨ËœÃ¯ ¼Å'æ ´ »Ã¥â€° Ã§â€Å¸Ã¥ Å¾Ã£â‚¬â€šÃ©â‚¬â„¢Ã§ ¨ ®Ã¨  ½Ã¤ ¼ Ã§Å¡â€ž Ã¥ ­ ¸Ã§ ¿â€™Ã¦â€¦â€¹Ã¥ º ¦Ã¯ ¼Å'æâ€" ¢Ã¤ ¸ Ã§ ¬ ¦Ã§  ¾Ã¤ » £Ã¦â€¢â„¢Ã¨â€š ²Ã¥Å½Å¸Ã¥â€°â€¡Ã¯ ¼Å'ä º ¦Ã¦Å"‰é â€¢Ã¨â‚¬Æ'è © ¦Ã¨â€˜â€"é‡ Ã§ â€ Ã¨ § £Ã¨Æ' ½Ã¥Å â€ºÃ¨Ë†â€¡ é â€¹Ã§â€ ¨Ã¦Å â‚¬Ã¥ · §Ã¤ ¹â€¹Ã¦â€" ¨Ã£â‚¬â€šÃ¥â€º  Ã¦ ­ ¤Ã¯ ¼Å'æÅ" ¬Ã¥ ±â‚¬Ã§ ± ²Ã¨ «â€¹Ã¥ â€žÃ©â€" ±Ã¥  ·Ã¥â€œ ¡/æ•™å ¸ «Ã©â‚¬Å¡Ã¥Å â€ºÃ¥ Ë†Ã¤ ½Å"ï ¼Å'Ã¥  â€¦ Ã¥ ®Ë†Ã¤ ¸Å Ã¨ ¿ °Ã¥Å½Å¸Ã¥â€°â€¡Ã£â‚¬â€š This marking scheme has been prepared by the Hong Kong Examinations and Assessment Authority for markers’ reference. The Authority has no objection to markers sharing it, after the completion of marking, with colleagues who are teaching the subject. However, under no circumstances should it be given†¦show more content†¦Because energy loss by the steam is also gained by the surroundings including the air/the jug (usually metallic) that holds milk. 1 ) V 4 4 p1 ( Ï€ Ãâ€" (0.8) 3 ) = (1.01 Ãâ€" 10 5 Pa )( Ï€ Ãâ€" (1.0) 3 ) 3 3 p1V1 = p2V2 (Or p ∠ 5 p1 = 1.97 Ãâ€" 10 Pa 1M correct eqn. or with sub. 1A 3 = 45600 J 1 A 1M 1A 2 1A 1A 2 1M 1A correct answer, accept 2 sig. fig. [Accept without 4 Ï€] 3 1A 2 (Accept 1.97 Ãâ€" 105 Pa to 2.00 Ãâ€" 105 Pa) (b) 3. (a) Volume increases as bubble rises but the speed / k.e. 1A speed / k.e. of molecules of gas molecules remains unchanged unchanged therefore frequency of collision of molecules on 1A frequency of collision on inner bubble’s inner surface decreases, gas pressure decreases. surface/wall decreases AND pressure decreases 1A (i) 1A Friction f between the tyres and the road. mv 2 f = r 8000 N = (1200 kg)v 2 45 m 1A Friction 1M correct eqn. or with sub. 2 1A 1M 1A correct answer v = 17.3 m s −1 (Accept 17.0 to 17.4 m s–1) (ii) (b) 1A 3 Smaller For the same f, v2 ∠ r, r decreases, v decreases. 1A 1A 2 (Max) friction / coefficient of friction reduced, Not enough to provide the centripetal force / acceleration required for circular motion. Or Tracking or allowed speed lowered. 2012-DSE-PHY 1B–3 Ã¥  ªÃ©â„¢ Ã©â€" ±Ã¥  ·Ã¥â€œ ¡Ã¥ Æ'éâ€" ± FOR MARKERS’ USE ONLY 1A 1A 2 Ã¥  ªÃ©â„¢ Ã©â€" ±Ã¥  ·Ã¥â€œ ¡Ã¥ Æ'éâ€" ± FOR MARKERS’ USE ONLY Marks 4. (a) (i) v = u + at 1M correct sub. into correct eqn. = 60 + (– 4)5 1A correct answer = 40 m s –1 (ii) 1M 1A 2 v / m s –1 60 40 A

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