PHYSICS - Trial Paper Collection

papercollection10SECTION CNOMARKING CRITERIA11(a) (i) State the explanation correctly- Temperature of the coolant decreases- Speed of the molecules decreases- Distance between molecules decreasesMARKSUB TOTAL111 3(ii)State the explanation correctly- When coolant changes from a liquid to a gas, latent heat isrequired.- Latent heat is obtained from the interior of the refrigerator.11 2(b)State the specific latent heat of vaporisation and reasoncorrectly1 High specific latent heat of vaporization2 Rate of heat removed is faster1+1State the boiling point and reason correctly 1+13 Coolant with low boiling point4 Easily can to vapour/gasState the specific heat capacity and reason correctly 1+15 Low specific heat capacity6 Can be heat up (cool down) fasterState the diameter and reason correctly 1+17 Big diameter8 Can carry more coolantState most suitable choice of coolant and justification correctly 1QLow specific latent heat of vaporization and low boiling pointState most suitable pipe and justification correctly 1ZLow specific heat capacity and big diameter10(c) (i)State the meaning correctlyThe quantities of heat required to change the temperature of 1 kgof water by 1 o C is 4200 J.1(ii)Correct substitution0.5 x 4200 x 30 1Correct answer and correct unit63 000 J 1(iii)Correct substitution0.5 x 3.34.x 10 5 1Correct answer and correct unit1.67 x 10 5 J 1 520