crushed or cubes?

Susan prepared cold Ribena for her son's birthday party. She wanted the drink to remain cold for as long as possible. 

Q: Which type of ice, cubes or crushed, should she use?

A: Ice cubes. They have less surface area in contact area with the drink than crushed ice. So they will melt more slowly.  BUT they will also cool the drink more slowly.

Exam Answering Tips

MCQ

- Highlight keywords (eg. incorrect, experiment in the dark, extension vs length of spring)
- Eliminate (cross out) the wrong options
- Some questions have multiple statements and the question asks “which is correct?”
eg. if you are sure R is definitely false, you can cross it out and eliminate that answer.
- When checking, tally the shaded OAS oval with your choice written on the question paper.
- When checking, cover your choices on the question paper. Look at the options again to make sure you have selected the most appropriate one.

Open ended

- Read the question carefully and highlight the keywords.
- Answer the question directly. If question ask about Object A, answer directly "Object A is ..."
- Some questions have parts (a) and (b). If part (a) asks for an observation and part (b) for the explanation, don’t explain it in part (a).
- Comparing: remember to state the different properties of BOTH objects in comparison.
eg. “state the difference between gases and liquids” – answer : “gases are … while liquids are..”
- 1 mark question, the answer required is brief and direct. Usually there is only 1 or 2 point.
- 2 mark questions, the answer required is longer and more detailed.
eg. Q is “identify… and explain why” - 1 mark is for the identification and 1 mark for the explanation.
eg. Listing steps of experiment - half mark per step
- Don’t ever leave any question blank! You may get awarded partial marks if you hit some keywords and concepts even if you may not understand it completely.

Other tips

- Be positive - don’t worry about your past grades
- Sleep early. There is no point doing last minute revisions.
- Eat your usual breakfast. Don’t try anything funny. You don’t want to be struggling with a stomachache.
- Pack your bag with all the stationery you need the night before.

optical illusions...i like

http://weirdfacts.com/optical-illusions.html

For Vaniz

which part of the plant?

1) Garlic – swollen leaf with a bit of stem

2) Clove – dried flower bud

3) Pepper - seeds

4) Onion/Shallot - swollen leaf with a bit of stem
5) Tapioca - root

6) Beet root - root

Practice Paper 1 (ANS)

Section A  -  MCQ ( 30 x 2m = 60 m)

Qn	Answer		Qn	Answer		Qn	Answer
1	4		11	4		21	1
2	3		12	3		22	2
3	3		13	2		23	2
4	2		14	1		24	1
5	3		15	1		25	4
6	4		16	4		26	2
7	4		17	2		27	2
8	1		18	1		28	3
9	2		19	2		29	3
10	1		20	4		30	2

Section B

Qn			Answers
31	a)		liquid
	b)		solid
32	ai)		150 cm3
	aii)		Air can be compressed (1 m) and has no definite volume (1 m).
	b)		The air in the holes of the sponge can be compressed. (1 m)
33	a)		Both cannot make their own food. (1m) Both need air, food and water to survive. (1m) Both can grow. (1m)
	bi)		The mushroom reproduces from spores but the mouse gives birth to its young alive. (1m)
	ii)		The mouse can move from place to place on its own but the mushroom cannot. (1 m)
34	a)		Seed
	b)		Adult plant
35	a)		Both Animals P and R lay eggs.
	b)		Animal Q has hair on its body but Animal S has feathers               on its body. or Animal Q gives birth to their young alive but Animal S lays eggs.
	c)		Name any mammal that gives birth to young alive.   (1 m)                                  Platypus (0 m)     Spiny anteater (0 m)
36	a)		Waste / faeces / undigested food is removed from the body through Part X.
	b)		gullet, large intestine and anus  (accept any 2)
37	a)		light
	b)		reflected
38	a)		To find out which magnet can attract the paper clip from a greater distance. (1m)    Which magnet has a stronger magnetic force. (½ m)
	b i)		Magnetic force can act at a distance.
	b ii)		Magnets can attract magnetic materials.
39	ai)	The number of batteries used is different (1 m) Or The number of batteries used should be the same. (1 m)
		Or The number of turns should be different so as to investigate how the number of coils affects the strength of the electromagnet  (1m)
	b)	Place the magnetised iron nail near some paper clips (1 m) and observe how many of them are attracted to it. (1 m).
40
	c)	Place Object P nearer to Torch A. or   Bring torch A nearer to Object P  or   Shorten the distance between Torch A and Object P.
41	a)	The temperature would increase / rise. (½ m)
	b)	The liquid / mercury / alcohol in the thermometer (½ m) gains heat from the hands/fingers (½ m) and expand (½ m).
42		A woollen jacket traps air in between the body and the jacket.(1 m)  Air is a bad conductor of heat (½ m)   and does not allow the body heat to pass through it to the surrounding cold air quickly(½ m)   .
43	a)	Leaf / leaves
	b)	Water (1m)  or   mineral salts (1 m)           Minerals   (0 m)
44	a)	P : egg
	b)	Q: pupa
45	a)			Type of edges
	b)			Group A: Leaves with smooth edge (½ m) Group B: Leaves with jagged edge / tooth-edged  (½ m)
	c)			(i)  The stem carries water and minerals salts (½ m) from the roots to the leaves (½ m) and (ii)  carries food made by / from the leaves (½ m)  to the other parts of the plants(½ m)      OR (i)     The stem holds the leaves  (1 m) (ii)    enables them to reach for sunlight (½ m)  to make food. (½ m)