Science 3 1 Prepared by: Mauie Flores

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SCIENCE 3

Lourdes School of Mandaluyong

3rd Trimester Exam

Write the correct answer in the blanks. Choose your answer from the list below.

o reflection

o rainbow

o magnet

o Aurora

o vibrations

o force

o transparent

o light

o unbalanced forces

o prism

o gravity

o sound

o shadow

o absorption

o opaque

o balanced forces

o echo

o refraction

o translucent

o colorants

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1. A form of energy that travels from its source in straight lines.

2. Formed when fast-moving particles from the sun reach the

earth and crash into air particles.

3. The back and forth movements that produce sounds.

4. The bending of light.

5. Happens when light rays do not pass through a material but

are taken in instead.

6. The bouncing of light.

7. Materials that allow light to pass through.

8. Appears in the sky when sunlight passes through water

droplets after a rain.

9. Materials that do not allow light to pass through.

10. Materials that allow some light rays to pass through but

scatter most of them.

11. Sound that is reflected when someone shouts in a big room.

12. A specially shaped glass which breaks white light into a

band of different colors.

13. Chemical substances that give colors to materials such as

paints, ink, chalk, and crayons.

14. A form of energy that is produced by vibrations.

15. Formed when an object blocks light.

16. A push or a pull.

17. The force that pulls all objects toward the center of a huge

body like the earth.

18. Can attract or pull objects made or iron or steel.

19. Forces that act on objects and do not make them move.

20. Forces that can make an object move in the direction of

the greater force.

Science 3 2 Prepared by: Mauie Flores

LSM 2009-2010 www.the24hourmommy.com ©

Write True or False in the blank.

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1. A rainbow appears in the sky after a rain shower because the

colorants in the clouds are washed away.

2. It is the light that objects reflect to our eyes that enables us to see

what the object is and what color it has.

3. White light is made up of a band of different colors.

4. The loudness of a sound depends on the distance of the source

of the sound to somebody’s ears.

5. When you throw a stone against a plastic sheet, the sound will be

reflected and not absorbed.

6. When two forces are acting on an object, the greater force will

cause the object to move.

7. A moving object tends to keep on moving in a straight line until a

force makes it stop or change its direction.

8. You will need more force to move an object that has less mass.

9. For every action, there is an equal opposite reaction.

10. The table will move when two boys push from opposite sides with

equal force.

Write the letter of your answer in the blanks.

a. sources b. renewable resources

c. conservation d. nonrenewable resources

1. The sources of things we need and the sources of our income are called _____.

2. Natural resources which can be replaced by natural processes or maintained by

proper practices are called _____.

3. Minerals are examples of _____. They get used up.

4. _____ is the proper use of natural resources so that we can have them for a long

time.

e. sand f. loam

g. fertile soil h. organic fertilizer

i. clay j. soil

5. _____ is the upper layer of the earth in which plants grow.

6. _____ is mixed with cement and used as construction material.

7. _____ is used in making jars, cooking pots, and flower pots.

8. _____ is rich in humus, so it is good for growing plants.

9. _____ produces a good harvest.

10. _____ comes from the decomposed remains of living things.

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k. soil erosion l. plant cover

m. crop rotation n. fallowing

11. Farmers skip one planting season before planting the next crop to protect the

soil. They call this practice _____.

12. _____ is done by alternately planting two crops year after year.

13. _____ happens when wind and running water carry away the soil.

14. Grass and other plants can be used as _____ to prevent erosion.

o. Potable water p. Polluted water

15. Water that is fit for drinking is called _____.

16. _____ is harmful to living things.

Enumeration.

Natural sources of light:

1. ___________________________________ 2. ___________________________________

Artificial sources of light:

1. ___________________________________ 2. ___________________________________

Transparent materials:

1. ___________________________________ 2. ___________________________________

Translucent materials:

1. ___________________________________ 2. ___________________________________

Opaque materials:

1. ___________________________________ 2. ___________________________________

Ways to protect oneself from too much light and sound:

1. ______________________________________________________________________

2. ______________________________________________________________________

3. ______________________________________________________________________

4. ______________________________________________________________________

Objects that can be moved by wind:

1. ___________________________________ 2. ___________________________________

Objects that can be moved by running water:

1. ___________________________________ 2. ___________________________________

Objects that can be moved by a magnet:

1. ___________________________________ 2. ___________________________________

Uses of soil:

1. ______________________________________________________________________

2. ______________________________________________________________________

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3. ______________________________________________________________________

Ways of protecting the soil:

1. ______________________________________________________________________

2. ______________________________________________________________________

3. ______________________________________________________________________

Uses of water:

1. ______________________________________________________________________

2. ______________________________________________________________________

3. ______________________________________________________________________

Practices that cause water pollution:

1. ______________________________________________________________________

2. ______________________________________________________________________

3. ______________________________________________________________________