PSHS Science Self Check 6

PSHS Science Self Check 6

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Question 1 of 13

1. Question
Direction: Choose the answer and indicate it by darkening the appropriate circle on your answer sheet.

Which arrow represents photosynthesis?
- 1
- 2
- 3
- 4
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Question 2 of 13

2. Question
Which arrow represents respiration?
- 3 only
- 4 only
- 2 and 4
- 3 and 4
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Question 3 of 13

3. Question
Which one of the following statements about energy is NOT correct?
- As energy is changed to another form, its quality changes.
- Energy is created when plants undergo photosynthesis.
- The sun is the main source of energy of all living things on Earth.
- A battery has chemical potential energy which transforms to electric energy.
Correct

Incorrect
Question 4 of 13

4. Question
A plant whose leaves are heavily coated with grease cannot carry out photosynthesis because
- grease reacts with chlorophyll.
- sunlight cannot penetrate the leaves.
- grease prevents gas exchange from taking place.
- grease prevents water absorption into the leaves.
Correct

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Question 5 of 13

5. Question
When an object absorbs heat,
- it undergoes an exothermic reaction.
- it retains its temperature.
- it is a colder object than the heat source.
- It will remain heated for a long time.
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Question 6 of 13

6. Question
The decomposition of water is shown in the following chemical equation:

The reaction can be done
- by heating the water until it boils.
- through the process of electrolysis.
- through the process of distillation.
- by transforming the water to vapor.
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Question 7 of 13

7. Question
In the chemical equation in item 6, which of the following statements about the equation is not correct?
- Water is the reactant in this chemical reaction.
- Hydrogen and oxygen are the products.
- This shows a composition reaction.
- Electricity is applied in the reaction.
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Question 8 of 13

8. Question
The concentrations of carbon dioxide and oxygen in the atmosphere are kept relatively constant because of two natural processes known as photosynthesis and
- Circulation
- Aerobic respiration
- Homeostasis
- Capillary action
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Question 9 of 13

9. Question
Solutions A, B, and C and D have the following pH values, respectively: 12, 9, 7, 3.

Which of these solutions is acidic?
- 12
- 9
- 7
- 3
Correct

Incorrect
Question 10 of 13

10. Question
Which solutions can be mixed to form a neutral solution?
- A and B
- B and D
- C and D
- A and C
Correct

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Question 11 of 13

11. Question
Fruits and vegetables last longer when placed in the refrigerator. What explains this fact?
- Low temperature slows down chemical reactions.
- Low temperature speeds us chemical reactions.
- Refrigerators are used to preserve food.
- Refrigerators inhibit the production of enzymes.
Correct

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Question 12 of 13

12. Question
Which of the following would happen when an acid is slowly poured to a basic solution?
- Bubbles would form.
- The pH of the basic solution would increase.
- The pH of the acid would increase.
- The color of the mixture would change.
Correct

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Question 13 of 13

13. Question
A student wants to determine whether a certain liquid is acidic. Which of the following procedures would tell him whether or not it is so?
- Determine its boiling point.
- Taste it to find out if it is sour or not.
- Use the litmus paper test.
- Add salt and water.
Correct

Incorrect

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