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- 1. Multiple Choice
Which of the following exists as a natural compound in the Earth's crust?
Gold
Tin
Marble
Diamond
- 2. Multiple Choice
Hematite is a natural compound for _______ oxide.
Iron
Aluminium
Calcium
Zinc
- 3. Multiple Choice
Which of the following metal oxides does not react with carbon?
Zinc oxide
Copper oxide
Ferum oxide
Aluminium oxide
- 4. Multiple Choice
Which of the following is not the consequences of unplanned mining activities on the environment?
The carbon cycle remains balanced even after logging activities.
The extinction of endemic species
Deposition of silt often cause flash floods in surrounding area
Transmission of infectious diseases due to improper drainage system.
- 5. Multiple Choice
Which of the following describes exothermic reaction?
The container becomes cold
The temperature dropped
Heat energy is released
The concentration of chemical substances increases
- 6. Multiple Choice
What type of reaction occurs in the diagram above?
Neutralisation
Crystallisation
Exothermic
Endothermic
- 7. Multiple Choice
Which of the following statement is true about endothermic reaction?
Heat releases to the surrounding
More energy is required
The temperature of the surrounding is lower than the temperature of reaction
The temperature of the surrounding is higher than the temperature of the reaction
- 8. Multiple Choice
Which of the following reaction is an example of endothermic reaction?
Rusting
Nuclear fission
Neutralisation of acid and alkali
Photosynthesis
- 9. Multiple Choice
In every chemical reaction, the temperature of the reactants will become the same as the surrounding temperature when ___________ achieved.
Thermal equilibrium
Final point
Dynamic equilibrium
Ecosystem balance
- 10. Multiple Choice
Which of the following are the examples of exothermic reaction?
I Bomb explosion
II Respiration
III Photosynthesis
IV Melting of ice
I and II
I and III
II and IV
III and IV
- 11. Multiple Choice
Which of the following is not a renewable energy source?
Nuclear energy
Hydro energy
Biomass energy
Solar energy
- 12. Multiple Choice
Which of the following are the steps to conserve electric energy?
I Use appliances that are energy-efficient
II Leave lights on when not in use
III Unplug iron when not in use
IV Turn off water when brushing teeth
I and II
II and IV
I and III
III and IV
- 13. Multiple Choice
What is the value of secondary voltage?
40 V
80 V
120 V
240 V
- 14. Multiple Choice
Aisyah used an 800 W hair dryer for 15 minutes. What is the cost of electrical energy used if the rate per unit is 21 sen?
4.2 cent
5.25 cent
8.5 cent
10 cent
- 15. Multiple Choice
Which device is used to change the voltage of an alternating current in an electrical appliances?
Switch
Fuse
Transformer
Oscilloscope
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