Latest Physical Science Reviewer 15

1. Which refers to the recorded observations and measurements in an explanation?

A. Conclusion

B. Data

C. Graph

D. Variables

Ans: B. Data

-Data are factual information or observation which may include appearance or behavior of something in an experimental set-up. Conclusion is the answer or the final decision in a problem. Graphs are diagrams that present the data. Variables are factors that may affect the result of an experiment.

2. How is hypothesis tested?

A. By gathering enough information about the problem

B. By making inferences

C. By conducting experiment

D. By formulating conclusion

Ans: C. By conducting experiment

Hypothesis is a plausible explanation to a problem. It is a simple statement that defines what you think

the outcome of experiment will be. Designing and carrying out an experiment test whether the hypothesis is true or false.

3. Which summarizes a natural occurrence that may be constantly observed given the same conditions which may be expressed in words or in mathematical form?

A. Conclusion

B. Hypothesis

C. Law

D. Theory

Ans: C. Law

A law generalizes a body of observation. At the time it is made, no exceptions have been found. A theory summarizes a hypothesis or group of hypothesis that have been supported with repeated testing. Theories can be disproven while law is universally acceptable.

4. Ruben prepares a solution by putting a pinch of orange crystals to water in a beaker, then by consistent stirring, the crystal dissolve. Which of the statements above are likely to be observed by Ruben?

I. The water becomes orange.

II. The color of the solution becomes darker.

III. Crystals disappear from the bottom of the beaker.

IV. The beaker and its contents become heavier as attiring continues.

A. I and II only

B. III and IV only

C. I, II, and III only

D. I, II, and IV only

Ans: C. I, II, and III only

-   Since the solute is a pinch of orange crystals and the solvent is water, it is most likely that the solution becomes orange, darker and the crystal disappear due to constant stirring. There was no statement in the item that will support that the beaker and its contest become heavier as string continues.

5. Which of the following is NOT  true about scientific method?

A. Conclusion is the last step

B. Scientific method may be applied in every life.

C. Scientific method is a systematic way of solving problem.

D. Scientific method is done by following a step-by-step procedure in an exact sequence.

Ans: D. Scientific method is done by following a step-by-step procedure in an exact sequence.

- While scientific method entails a step-by-step procedure, there are instances that the exact sequence may not be followed yet arrived at the same results.

6. Which apparatus will you use to measure the mass of an irregular solid correctly?

A. Empty beaker

B. Erlenmeyer  flash

C. Graduated cylinder with water

D. Vernier caliper

Ans: C. Graduated cylinder with water

- The mass of an irregular solid can be determined by placing it in a graduated cylinder with wter, then subtracting the initial reading from the final reading. An empty beaker is used to mix and pour liquids. An Erlenmeyer flak is used to mix a large amount of liquid and to pour liquids through small openings. A vernier caliper is used for measuring either the internal or external diameters of tubes, pipes and rods

7. To graph the distance covered and velocity of a car, which is the dependent variable? Where should be it plotted on a line graph?

A. Distance, x axis

B. Distance, y-axis

C. Velocity, x-axis

D. Velocity, y-axis

Ans: B. Distance, y-axis

- Distance is dependent on the velocity of the car, and in a line graph, the dependable variable is drawn on the y-axis while the independent variable (velocity of the car) is drawn on the x-axis.

8. A student found a piece of metal. What can the student to do quickly determine if the metal might contain iron?

A. Heat the metal

B. Weight the metal

C. Place the metal in water

D. Place the metal near the magnet

Ans: D. Place the metal near the magnet

- Iron can be attracted by a magnet. Heating, weight or placing the metal in water will not indicate quickly that it contains iron.

9. A student dipped a strip of aluminum and a strip of iron in water. The student then exposed the strips to air for one week. Which was most likely observed one week later?

A. The iron strip formed rust.

B. The aluminum strip formed rust.

C. Both of the metal strips formed rust.

D. Neither of the metal formed rust.

Ans: A. The iron strip formed rust.

- Since water has oxygen content, combining it with iron will yield to rust.

10.What human activity has added the most carbon in the atmosphere?

A. Burning fossils fuels

B. Mining fossil fuel

C. Increasing soil erosion

D. Cutting down the rain forests

Ans: A. Burning of fossil fuels

-The recent phenomenon of global warming has been attributed primarily to increasing atmospheric CO₂ concentrations in Earth’s atmosphere. The global annual mean concentration of CO₂ in the atmosphere has increased markedly since the Industrial Revolution, From 280 ppm as of 2013, with the increase largely attributed to the burning of fossil fuels.

11. The Table below lists measurements tasks included in laboratory activities conducted by students in a Grade 9 science class. Which matches a measurement task with the correct measurement tools?

Measurement Task	Tools
I. Add 10g of salt to 200 ml of water and stir	Triple-beam balance, 25 ml capacity beaker marked in 1 ml intervals
II. Add 20 ml of rubbing alcohol to 50 ml of water	250 ml capacity Erlenmeyer flash marked in 50 ml intervals
III. Add 3 ml of cooking oil to 10g of sugar	5 ml capacity pipette marked in 1 ml intervals, pan balance with masses petri dish
IV. Add 25 g sugar to 15 ml of water and heat until the sugar dissolves	100 ml capacity graduted cylinder marked in 25 ml intervals, spring scale, mortar

A. I

B. II

C. III

D. IV

Ans: C. III

- A 5 ml capacity pipette, pan balance with masses and petri dish are appropriate tools to accomplish the measurement task of adding 3 M1 of cooking oil to 10 g of sugar.

12. Aubrey wants to track her summative tests scores over the course of the first grading period. Which of the following will BEST allow her to analyze her progress?

A. Bar graph

B. Line graph

C. Pie graph

D. Scatter graph

Ans: A. Bar graph

-A bar graph is appropriate for comparing data, different trials or different experimental groups. A line graph shown variables.  A pie graph is used to represent a part to whole relationship. A scatter plot is used to display values for a set of data as a collection of points.

13. What will most likely occur if global warming will not be addressed?

A. Lower se levels

B. Melting of ice cups

C. More pollution in water

D. More reflected sunlight off the ice pack

Ans: B. solve chronic food shortages through the use of technology

-green revolution as initiated by Norman Borlaug refers to a series research, development, and technology transfer initiatives that aims to increase agricultural production worldwide.

14. How is the relationship described when both quantities are increasing but one quantity increases faster than the other.

A. Direct proportion

B. Direct square proportion

C. Inverse proportion

D. Inverse square proportion

Ans:  B. Direct square proportion

- Direct square portion is a relationship where both quantities are increasing but one quantity increase faster than the other. Direct proportion is a relationship where one quantity in increasing proportionately with the other. An inverse proportion is one wherein an increase in one quantity means a decrease in the other. An inverse square proportion is a kind relationship where one quantity decreases faster as the other quantity increases.

15. In your attempt to determine which is denser oil or water, you mixed 25 ml of oil with 25ml of water. What helpful qualitative data can you derive from the set-up?

A. There are 50 ml of liquid in the container.

B. Oil did not mix with water.

C. Oil is on top of the water.

D. There are 25 ml of water and 25 ml of oil in the container.

Ans: C. Oil is on top of the water.

- Data may be qualitative or quantitative. Qualitative data are information that describe the characteristics of how something looks, smells or behaves. Quantitative data are information that are expressed in numbers, Since water is denser than oil, a qualitative data that can be derived from an experiment is oil is on top of water.

16. Which of the following is a compound?

A. Cemented wall

B. Dry ice

C. Gold

D. Tincture of iodine

Ans: B. Dry ice

- A compound is a substance formed when two or more chemical elements are chemically bonded together . Dry ice is a compound since it is a solid carbon dioxide. Cemented wall is a mixture. Gold is an element. A tincture of iodine is a homogeneous mixture as it is a solution of iodine in alcohol.

17. Which is most likely to change the blue litmus paper to red?

A. Ammonia in water

B. Detergent solution

C. Lime water

D. Vinegar

Ans D. Vinegar

- An acid turns blue litmus paper to red. Ammonia, detergent, and limewater are all base except for vinegar which is an acid.

18. Which can be classified as homogeneous mixture?

I. Buko pie

II. Blood

III. Virgin coconut oil

IV. Mango juice

A. III only

B. I and II only

C. I, III, and IV only

D. II,III and IV only

Ans: D. II,III and IV only

- A homogeneous mixture is a type of mixture in which the composition is uniform and every part of the solution has the same properties. Buko pie is not a homogeneous mixture since it composition is not uniform.

19. Which of the following is a physical property of non-metals?

A. Malleability and ductility

B. Low tensile strength

C. High density

D. High tensile strength

Ans: B. Low tensile strength

- A non-metal is a poor conductor of heat and electricity, has no luster, brittle, not ductile, not malleable, has low density low melting poit and low tensile strength.

20. The yellow color of a highlighter is a ________property.

A. chemical

B. heterogeneous

C. homogeneous

D. physical

Ans: D. physical

-Physical property is one that is displayed without any change in composition. Color is an intensive property. Intensive property is a physical property that will be the same regardless of the amount of matter.

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