SampleTask PHY E 121110
Hong Kong Diploma of Secondary Education Examination
Physics and Combined Science (Physics)
School-based Assessment Sample Tasks
(Practical Related Tasks)
Teachers may use the sample tasks for non-profit making educational and research purposes with proper acknowledgement.
香港考試及評核局 保留版權
2 01 0
©
Hong Kong Examinations and Assessment Authority
All Rights Reserved 2010
TABLE OF CONTENT
Task
Title
E1
Relationship between pressure and volume of a gas
E2
Newton’s second law of motion
E3
Centripetal force
E4
Focal length of a convex lens
E5
Internal resistance of a battery
Physics and CS(Physics)
Sample SBA Task
Practical Skills (
%)
Reporting
%)
(
Total
E1 Relationship between
Pressure and Volume of Gas
Name :
Class :
No.:
Date :
Objectives:
To investigate the relationship between pressure and volume of air in a syringe.
Apparatus:
60 cm3 plastic syringe
Bourdon gauge rubber tubing vaseline Theory:
Boyle's law states that pressure is inversely proportional to the volume of a gas, provided that the mass and temperature of the gas remain constant. This relationship can be demonstrated by a syringe of air. The syringe is connected to a Bourdon gauge to measure the pressure. The volume of the gas can be estimated by reading the scale on the syringe.
Procedures:
1. Take out the piston of the syringe.
Put a little vaseline evenly on top of piston. Fit the piston
back to the syringe.
2.
Set the volume of air inside the syringe to roughly 25 cm3.
3.
Connect the syringe to the Bourdon gauge with rubber tubing.
Put a little vaseline on the
surface of connectors before fitting in the rubber tubing.
Bourdon gauge syringe
rubber tubing piston
4.
The Bourdon gauge should read roughly 1.0 × 105 Pa (approximately equal to atmospheric pressure). As the pointer of the Bourdon gauge may get stuck due to the friction of the mechanical parts inside, tap the Bourdon gauge slightly every time before you take a reading.
Student
Physics and Combined Science (Physics)
School-based Assessment Sample Tasks
(Practical Related Tasks)
Teachers may use the sample tasks for non-profit making educational and research purposes with proper acknowledgement.
香港考試及評核局 保留版權
2 01 0
©
Hong Kong Examinations and Assessment Authority
All Rights Reserved 2010
TABLE OF CONTENT
Task
Title
E1
Relationship between pressure and volume of a gas
E2
Newton’s second law of motion
E3
Centripetal force
E4
Focal length of a convex lens
E5
Internal resistance of a battery
Physics and CS(Physics)
Sample SBA Task
Practical Skills (
%)
Reporting
%)
(
Total
E1 Relationship between
Pressure and Volume of Gas
Name :
Class :
No.:
Date :
Objectives:
To investigate the relationship between pressure and volume of air in a syringe.
Apparatus:
60 cm3 plastic syringe
Bourdon gauge rubber tubing vaseline Theory:
Boyle's law states that pressure is inversely proportional to the volume of a gas, provided that the mass and temperature of the gas remain constant. This relationship can be demonstrated by a syringe of air. The syringe is connected to a Bourdon gauge to measure the pressure. The volume of the gas can be estimated by reading the scale on the syringe.
Procedures:
1. Take out the piston of the syringe.
Put a little vaseline evenly on top of piston. Fit the piston
back to the syringe.
2.
Set the volume of air inside the syringe to roughly 25 cm3.
3.
Connect the syringe to the Bourdon gauge with rubber tubing.
Put a little vaseline on the
surface of connectors before fitting in the rubber tubing.
Bourdon gauge syringe
rubber tubing piston
4.
The Bourdon gauge should read roughly 1.0 × 105 Pa (approximately equal to atmospheric pressure). As the pointer of the Bourdon gauge may get stuck due to the friction of the mechanical parts inside, tap the Bourdon gauge slightly every time before you take a reading.
Student