Science Quizzes Solution Sets

SCIENCE QUIZZES SOLUTION SETS

GENERAL SCIENCE

1. C. force and distance

Work is equal to force times distance (displacement). W=fxd

1. A. salt water is heavier than water.

Density is directly proportional to mass. D = M/v

1. B. Kinetic energy is energy in motion.
2. C        The higher the object is, the greater is the potential energy.
3. C. Convection takes place when there is a movement of air from hot place to cold place. The sea and Land differ in temperature at night time and daytime, the reason why there is sea breeze and land breeze at daytime and night time respectively.
4. A. 5.8 mL

Using water displacement method,

Vobject = Vfinal - Vinitial 

        = 23. 6 – 17.8 = 5.8 mL

1. A. 100 g = 1 N; 17.6 g x (1N/100 g) = 0.176 N
2. D. Work = force x distance = 500 N x 10 m = 5000 Nm = 5000 J
3. A. Ionosphere is the layer of the atmosphere composed of charged ions that returns radio and tv signals back on earth.
4. C. during a stormy day, heavy black clouds are seen in the sky. these are nimbus clouds.
5. D. many years of stress on the rock may fracture the crust causing one portion to slide upward or down ward with respect to the other.
6. C. mountain is formed when two plates move toward each other.
7. F = 9/5 __C + 32

F = 9/5 (30) + 32

F = 86        (c)

1. A CFC is not a greenhouse gas. It only damages the ozone layer.
2. C = K – 273         C= 0 – 273        ;         0 Kelvin = -273 C  (d)
3. C. the independent variable is the factor that is being changed in the experiment. The amount of moisture is the factor being changed in the experiment given.
4. C. based on the data table, it can be concluded that molds grow best in cold places.
5. C. using the scientific method, we can let Bisuke and Killua punch the same object a number of times and compare the damage done. (You would not want to be hurt in an experiment, right?)
6. A. the sun’s reflection on the moon gives the moon the ability to shine.
7. A. when the moon is closer to the earth, the greater the effect of gravity.
8. A. the crust is the hard outer shell of the earth.
9. C. A composite volcano is formed from alternating quiet and violent eruptions. An example is Mount Mayon.
10. B. [pic 1]
11. B. blue star is the hottest star followed by the white star, yellow star and finally the red star.
12. B. Venus is called the win planet of the earth because they almost have the same size.
13. D. The smallest, coldest and the outermost planet in the solar system is Pluto.
14. B When two plates (sea floor )move apart (diverging) magma comes out and accumulate forming a mountain range under the sea called the mid-ocean ridge.
15. C. When engines burn fossil fuels, carbon dioxide, a harmful gas is produced.
16. B. The ozone layer absorbs a portion of the radiation from the sun, preventing it from reaching the earth.
17. On clear calm evenings, temperature differences between a body of water and neighboring land produce a cool wind known as the land breeze that blows offshore.

BIOLOGY

1. C. cells grouped together form tissue; tissues working together form organs; organs working together form a system
2. B. the products of photosynthesis is stored in the form of starch in plants.
3. C. cell walls of plant cells contain a high concentration of cellulose, a substance that cannot be digested properly by human beings.
4. B. mutualism is the process in which both organisms are benefited from the interaction. Plants are being benefited when animals release carbon dioxide which is needed by plants to make food. Animals are also benefited when plants produce oxygen which is needed by animals in order to live.
5. A. Oryza sativa is the scientific name of rice. The scientific name is taken from the genus and the species.
6. C. In the levels of classification if both organisms belong to the same class, they must also belong to the same phylum and kingdom for these are the levels higher than the class.
7. C. A prokaryotic cell does not have endoplasmic reticulum. It does not have a membrane bound organelle.
8. C. The skin is composed of epithelial tissues wherein cells are compactly arranged.
9. D. Genes are hereditary information contained in the DNA. DNA is deoxyribonucleic acid.
10. C. coevolution is the relationship that refers to the partial dependence of evolutionary changes of an organism to another specie which it has a close ecological relationship.
11. A. Not all vertebrates are warm blooded animals. Some are cold blooded like fishes and reptiles.
12. D. coiling up of chromatin, replication of DNA strands and movement of the chromosomes towards the center all happen during mitosis.
13. D. survival of the fittest suggests that stronger organisms with more favorable characteristics are more possible to survive and live longer than the weaker ones.
14. A. a plant cell has a cell wall, animals cell doesn’t have.
15. A. a prokaryotic cell does not have a true nucleus. It has chromosomes in the DNA and it also has a cell membrane that separates itself from the environment.
16. B. simple multicellular animals with tissues but no distinct organs; also known as sponger are under the phylum Porifera.
17. A. Notochord is the flexible supporting rod of vertebrates.
18. C. The plasma membrane is composed of two layers of phospholipids molecules.
19. C. White blood cells are the soldiers of the body that fight harmful bacteria that enter the body.
20. B. As the energy level in the food pyramid rises, the transfer of energy decreases to one tenth of the initial energy in evry stage.
21. B. Metaphase is that stage in meiosis when the paired homologous pair line up along the equatorial plate forming the spindle fiber
22. D. Hibernation and estivation are both response to extreme temperature.
23. A. When the animal’s temperature drops, the animal may die.
24. B. The nervous system carry nerve impulses to and from the brain.
25. D. When organisms like cockroaches are exposed to some insecticides for a long time, they are able to create permanent mutation in the next generation giving insect’s resistance from that insecticide.
26. D. Vascular organs are composed of xylem and phloem (vessels) that transport water and nutrient to the plant.
27. C. Mammals are vertebrates that have mammary glands.
28. A. Carbon and oxygen cycle is maintained by respiration. Oxygen is taking in and carbon dioxide is given out by animals  during respiration.
29. D. A cold blooded animal has body fluid temperature that adapts to environmental changes.
30. B. Sexual reproduction involves the use of gametes or sex cells.

CHEMISTRY

1. Given:

P1 = 2 atm        P2 = 1 atm

V1 = 100mL         V2 = ?

T1 = 299 K         T2 = 286 K

[pic 2]

1. A. There are 7 valence electron in the valence shell 4. The group number can be predicted from the number of valence electron  and the period number from the valence shell. Therefore, the element is in group7 & period 4 in the periodic table of the elements.
2. The balanced chemical equation is

2C6H14O4          +          15 O2             →      12CO2   + 14H2O

C= 2x 6 =12                                        C = 12

H = 2 x 1428                                        H = 14 x 2 = 28

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