SCIENCE AND HEALTH VI

______1. What substances or chemicals prevent food from decomposition?

a) additive b) preservatives -, ' c) solvent d) soap

______2. It is a substance capable of dissolving another substance.

a) additives b) preservatives c) solvent d) soap

______3. Which of the following is/are the correct safety rules?

a) Never take medicine in the dark. c) Light the stairways.

b) Keep matches out of reach of children. d) All of the above.

______4. Describe the arrangement of molecules in solids.

a) They are far apart from each other. c) They can go freely.

b) They are close together. d) They are arranged one foot apart.

______5. How can energy be transferred from one body to another?

a) by change in temperature c) by other reactions

b) by emitted light and sound d) all of the above

______6. What property of a metal does silver possess?

a) It is brittle. b) It is soft. c) It has luster. d) It can break into pieces.

______7. A dry cell is useless unless it is changed to

a) electrical energy b) chemical energy c) nuclear energy d) potential energy

______8. What kind of energy is involved when ice melts ?

a) light energy b) heat energy c) chemical energy d) nuclear energy

______9. A big rock falls from the mountain. What energy has the failing rock?

a) potential energy b) chemical energy c) mechanical energyd) heat energy

______10. What is the energy possessed by waterfalls?

a) heat energy b) mechanical energy c) electrical energy d) chemical energy

______11. The nucleus of an atom has powerful energy in store. How may this energy be released?

a) by splitting the nucleus c) by combining the atom with another atom

b) by keeping the nucleus intact d) all of these

______12. What form of energy is shown by a falling parachute?

a) chemical energy b) mechanical energy c) electrical energy d) radiant energy

______13. What energy changes are shown by a moving airplane ?

a) mechanical to heat c) electrical to heat

b) heat to mechanical d) heat to electrical

_____ _ 14. When the electric fan is on and revolving, what energy changes are shown?

a) mechanical to heat c) electrical to mechanical

b) heat to electrical d) chemical to mechanical

______15. A girl pedals her bicycle for five minutes and travels a distance of 120 meter.

What is the speed of the girt ?

a) 600 meter per minute c) 5 meters per minute

b) 12 meters per minute d) 24 meters per minute

______16. Which of the following best describes the velocity of a moving object ?

a) 60 km/hr b) 60 km/hr N c) 60 km/hr/sec d) none of the above

______17. Which would require the least force to stop ?

a) A car traveling at 120 km/hr c) A car traveling at 60 km/hr

b) A car traveling at 80 km/hr d) A car traveling at 10 km/hr

______18. Which statement regarding energy is correct?

a) There is gain in energy during conversion. b) There is loss of energy during conversion.

c) Energy can be created and destroyed. d) Energy cannot be created nor destroyed.

______19. Which of the following can transmit sound fastest ?

a) water b) air c) wood d) atmosphere

______20. Why must we conserve fossil fuels ?

a) They are abundant under the ground c) The government is controlling their sale.

b) They cannot be replaced. d) They can be renewed anytime.

______21. When molecules of matter are made to move fast, what form of energy is produced ?

a) heat b) sound c) light d) nuclear

______22. What kind of energy does bread possess ?

a) chemical b) solar c) kinetic d) mechanical

______23. When you shout your warning to a friend 50 meters away, what carries the sound ?

a) gas b) solid c) liquid d) water

______24. Choose the nonmetal among the following.

a) phosphorus b) tin c) aluminum d) gold

______25. Which of the following is NOT a characteristic of nonmetal ?

a) They are light. b) They conduct electricity

b) They do not possess luster d) They usually exist in liquid or gaseous form

Directions: Identify the word described in the following. Write the letter of your answer on the blank.

B. atom F. microscope J. kinetic energy

C. matter G. speed K. potential energy

D. additive H. Law of Conservation of Energy

______26. It occurs when the temperature in the environment rises.

______27. It is the smallest unit which cannot be broken down into pieces.

______28. It is the capacity to do work.

______29. It is the transfer of energy in one form to another.

______30. It is anything that has mass and occupies space

______31. It is the distance traveled by an object over a certain period of time.

______32. It is a substance which improves the taste and color of food.

______33. It states that energy is not created nor destroyed, it merely changes its form.

______34. It is energy that an object possess because of its position or condition.

______35. It is an instrument which is used to see objects which cannot be seen by the naked eye.

III. Alternative Questions

Directions: Write TRUE if the statement is correct or FALSE if otherwise.

______36. Fish and other aquatic animals will grow abundantly when there is thermal pollution.

______37. Insecticides and preservatives should be put separately in the cabinet.

______38. Nuclear energy has beneficial and harmful effects.

______39. Sound travel fastest in gas than in solid.

______40. Heat of the earth, wind and flowing water can be transformed to electrical energy.

______41. The most useful form of radiant energy is light energy.

______42. Motion takes place when the forces acting on an object are balanced.

______43. The molecules in solid exhibits surface tension.

______44. Silica is the most abundant element on earth.

______45.Speed of sound is faster than speed of light.

______46. Radiation is the by product of mechanical energy.

______47. Ultrasonic sounds are heard by dolphins, bats and dogs but not by man.

______48. Chlorofluorocarbons cause the thinning of the ozone layer.

______49. Most plastics dumped into rivers do not decay because there are no microbes that can

use them as food.

______50. Taste or smell unknown materials before using them.