Soal-science-physiscs

PROBLEM SHEET
DAILY TEST -1 GRADE 7 SEMESTER 2
LESSONS YEAR 2010/2011

Subject: Science

Choose the correct answer !

1. Below is the characteristics of copper. Which are chemical properties?
a. its yellowish brown
b. reacts with oxygen
c. easily bended
d. can conduct electric current

2. Examples of a chemical reaction are ....
a. vaporization of gasoline
b. melting of iron
c. photosynthesis
d. dissolving sugar in the water

3. Examples of a chemical change are ....
a. melting of candle
b. rice grain that is grounded until it becomes flour
c. rice that becomes smelly
d. wood sculpted into a decoration

4. The mixture of sand and gravels can be split based on their physical natures ....
a. color
b. size
c. type
d. weight

5. Chemical reaction that results in a change of color happens when ....
a. iron becomes red after it is painted.
b. apple becomes brown when it is peeled
c. orange is squeezed to get the juice with
yellow color
d. the color of a rainbow in the sky

6. Below which is not includes in physical property is ....
a. phase of substance
b. density
c. solubility
d. corrosive

7. Boiling, melting and freezing points in phase change of substances are called ....
a. physical constant
b. physical variable
c. chemical constant
d. chemical variable

8. Pay attention to these statements!
1. Colour is a physical property of a substance
2. Solubility is a chemical property of a substance
3. Conductivity is a physical property of a substance
4. Solidity is a chemical property of a substance
Among the above statements, the incorrect ones are .......
a. 1 and 2
b. 2 and 3
c. 1 and 4
d. 2 and 4

9. Materials which can conduct electricity and heat as well are called .....
a. semiconductor
b. conductor
c. semiinsulator
d. insulator



10. The following are insulator materials, except .....
a. copper
b. rubber
c. paper
d. wood

11. The chemical properties of an object relate to ....
a. initial substance
b. residue
c. formation of solution
d. formation of a new substance

12. The following are examples of the chemical properties of a substance, except .....
a. poisonous
b. corrosive
c. solubility
d. corrosible

13. The example of corrosive objects is.....
a. sulfuric acid
b. iron
c. urea
d. sulfur

14. The following are substances which are easy to explode, except .....
a. sodium
b. aluminium
c. uranium
d. magnesium

15. Physical change is .....
a. the change of substance the temperature of which changes
b. the change of substances followed by the change in colour
c. the change of substances which does not form a new substance
d. the change of substances which forms a new substance

16. The example of chemical changes is .....
a. wood is made into a box
b. wood is burned to become ash
c. ice melts
d. sugar is dissolved in water

17. The process of a chemical change is known as .....
a. chemical constant
b. chemical substances
c. chemical variable
d. chemical reaction

18. When a substance changes and it is difficult to be obtained again, the change of substance is included in .....
a. biological change
b. organic change
c. physical change
d. chemical change

19. A phenomenon being a chemical change is...
a. iodine sublimes
b. food digestion
c. sulfur melts
d. sugar is dissolved

20. The non chemical change is .....
a. wood is burned
b. iron rusts
c. milk becomes sour in taste
d. rice becomes powder

21. Of the following phenomena which does not produce a new substance is .....
a. foods rot down
b. firecracker explodes
c. wood become charcoal
d. rice becomes powder




22. The property of a substance which can be observed, sensed, and heard usually include in ....
a. physical properties
b. extensive properties
c. chemical properties
d. intensive properties

24. The followings are examples of chemical changes, except.....
a. wood becomes ash
b. ice melts
c. dynamit explodes
d. tempe rots down

25. When a substance undergoing any the change and it is easy to be obtained back, the change of the substance is incuded ..... change.
a. organic
b. biological
c. physical
d. chemical