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WorksheetsF5-Quiz-1 (31-Aug-2021)
Total questions: 7
Worksheet time: 5mins
A piece of rubber is dipped into a beaker containing an organic solvent and compound X for a few minutes.
The rubber piece is then removed and dried.
It is discovered that the rubber piece becomes more elastic and heat resistant.
What is compound X?
A. Ethanoic acid
B. Limewater
C. Disulphur dichloride
D. Sodium hydroxide
A rubber tapper adds ammonia solution to latex as shown in Figure 11.
Which of the following best explains the reason for doing this?
A. Ammonia solution enables latex to be easily moulded.
B. Ammonia solution contains hydroxide ions that repel each other.
C. Hydroxide ions in ammonia solution neutralise hydrogen ions from acid produced by bacteria.
D. Ammonia solution hardens latex.
Which of the following statement explain why vulcanised rubber is stronger and harder than unvulcanised rubber?
A. Formation of sulphur cross-links reduce the number of carbon-carbon double bonds, C=C in the polymer chains.
B. When the rubber is stretched and released,
the sulphur cross-links pull the polymer chains back to their original arrangement.
C. When rubber is stretched, the presence of sulphur cross-links makes the rubber polymer chains more difficult to slide over one another.
D. The presence of sulphur atoms increases the relative molecular mass. Intermolecular forces become stronger.
Which statement is not correct about latex?
A. Obtained from rubber tree
B. Withstands high temperature
C. Coagulates when an acid is added
C. Made of monomer called isoprene
Figure 10 shows the structure of a polymer.
Which of the following is correct regarding the polymer?
A. It is a condensation polymer.
B. It is also called isoprene.
C. It is also called polymethylbut- 1,3-diene.
D. It is resistant to oxidation
Diagram 4 shows a sketch of the orbit of a planet.
When the planet is at X, the length of q and p are 3.0 cm and 7.0 cm respectively.
Determine the length of s if the length of r is 7.5 cm when the planet is at Y.
A. 2.5 cm
B. 3.0 cm
C. 3.5 cm
D. 7.0 cm
Geostationary and non-geostationary satellites are two types of satellites orbiting the Earth.
There are a few differences between the two satellites.
Which statement is true?
A. Geostationary satellites are above the different geographical positions on the surface of the Earth.
B. Geostationary satellites have orbital period shorter than non-geostationary satellites.
C. MEASAT and INSAT are geostationary satellites while TiungSAT and RazakSAT are non-geostationary satellites.
D. Geostationary satellites do not necessarily move around the Earth in the same direction as the direction of the Earth's rotation.
