PAPER 3 SECTION A

BY PN. TAN SHIM YU

PAPER 3SECTION A

FORMAT :PAPER 3SECTION QUESTION FULL MARKS ELEMENT EVALUATED

A1 16 SCIENCE PROCESS SKILLS &

ANALYTICAL SKILLS2 12 MAKING EVALUATION AND

INTERPRETATION OF GRAPHB 3 12 CRITICAL THINKING AND SKILLS

OF MAKING RELATIONSHIP(USUALLY FORM 4 TOPIC)

4 12 CRITICAL THINKING AND SKILLS OF MAKING RELATIONSHIP(USUALLY FORM 4 TOPIC)

TOTAL 40

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42.2

4.22

17.81

(2 d.p.)

50.0

5.0

25.00

56.1

5.61

31.47

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61.3

6.13

37.58

66.2

6.62

43.82

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Acceptable graph

A

DC

B

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Length of the pendulum

Period of oscillation

Mass of the pendulum bob

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length of pendulum, l (cm)

time for 10 oscillations, t (s)

period of oscillations, T (s)

T2 (s2)

30.0 42.4 4.24 17.98

40.0 50 5 25

50.0 56.2 5.62 31.58

60.0 61.6 6.16 37.58

70.0 66.4 6.64 44.09

.00 .00.0

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Unacceptable graph

more than 1 cmmore than 1 cm

A

C D

B

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Rejected graphRejected graph

Rejected graph

more than 0.5 cm

Unacceptable graph

more than 0.5 cm

A

DC

B

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Square of period increases linearly with the length of the pendulum.OR

T2 increases linearly with l.

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Relationship between variables

a

b

A) a is inversely proportional to b

B) a is directly proportional to b

C) a increases linearly with b

a

b

A) a is inversely proportional to b

B) a is directly proportional to b

C) a increases linearly with b

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A) a is inversely proportional to b

B) a is directly proportional to b

C) a increases linearly with b

A) a is inversely proportional to b

B) a is directly proportional to 1/b

C) a increases linearly with 1/b

a

ba

1/b

Relationship between variables

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A) a is inversely proportional to b

B) a is directly proportional to b

C) a is linearly increasing with b

A) a is inversely proportional to 1/b B) a is directly proportional to 1/b C) a is linearly increasing with 1/b

a increases with b

a

ba

1/b

Relationship between variables

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Acceleration of the trolley is directly proportional to height of the inclined plane

Question 2

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(1.25-0) ms-2

0.25 m

= 5.00 s-2

1.5ms-2

extrapolation line

with unit

values/coordinates

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2102

5

msg

glgm

(b) (c)

267.0

1.05.1

10

msa

xa

xhlga

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(d) 1) Ensure the trolley moves down the incline without knocking the sides so that motion is not blocked.

2) Ensure the tape runs freely through the ticker timer without being impeded

3) Reduce the friction in the wheels by using oil so that the trolley can move smoothly

4) Repeat the expt so that a mean reading can be calculated to increase accuracy

5) When measuring height make sure the eyes is perpendicular to the ruler to avoid parallax error.

* statement without how is not accepted e.g. Make sure runway is smooth

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Question 3

(a) (i) Temperature (ii) Length of the air column (iii) Pressure of the trapped air/ diameter of the capillary tube(b) (i) The eye must be at a position which is level with the top section of the meniscus of the air column(c)

Temperature, Ө (oC) Length, l (cm)

0 7.1

20 7.6

30 7.9

40 8.1

50 8.4

60 8.7

70 9.0

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(d) l increases linearly with Ө

(e) The capillary tube and ruler must be parallel/ The trapped air column must be fully immersed in water.

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   Possible Precautions that can be taken:

Measuring Instrument

a. Avoid parallax error by placing the eye such that the line of view is perpendicular to the scale read. (for ammeter/voltmeter/measuring cylinder etc) b. Take into account zero error of instrument. (for calipper/micrometer/weight scale etc.)

Spring/Hooke’s Law

  a. make sure the spring is not loaded beyond the elastic limit. (spring return to original length when load is taken off). b. Avoid parallax error by placing the eye such that the line of view is perpendicular to the scale of the ruler.

Heat

  a. Liquid must be stirred constantly so that temperature rises evenly. b. Alluminium block must be wrapped with insulating material to prevent heat lost. c. Thermometer bulb should be smeared with oil to give better thermal contact with the block. d. Avoid parallax error by placing the eye such that the line of view is perpendicular to the scale of the thermometer.