Soal Mid Smtr 2 Sbi

PEMERINTAH KABUPATEN PURBALINGGA DINAS PENDIDIKAN DAN KEBUDAYAAN

SMP NEGERI 1 PURBALINGGA Jl. Kapt. Piere Tendean No. 8 Telp. (0281) 891089 Fax. (0281) 892918 KP 194 PURBALINGGA 53313 MID SEMESTER TEST ACADEMIC YEAR 2007/2008 Subject Class/Semester Day, date Duration

: Science-Physics : VII/2nd : : 120 minutes

I. Choose the correct answer by crossing (X) A, B, C, or D ! 1. Water becomes ice (solid) in the low temperature, state of water in the room temperature is liquid, and at the higher temperature, water changes into vapour (gas). This explains that the state of certain matter depends on it’s . . . . A. shape C. temperature B. size D. amount 2. Which of the following statements show the properties of matter? I. fill the space II. have mass III. can be in the form of different states A. I B. II

C. I and II D. I, II, and III

3. Which of the following statement is not true about matter? A. Matter has a fixed shaped C. Matter has mass B. All objects are made of matter D. Matter occupies space 4. An example of matter is . . . . A. heat B. light

C. water vapour D. electric current

5. Look at the table below: The state of mater solid liquid gas

Shape fixed (2)………… change

The correct answer for 1 and 2 is . . . . A. (1) change; (2) change B. (1) fixed; (2) change

Volume (1)...……… fixed change C. (1) change; (2) fixed D. (1) fixed; (2) fixed

6. Which of the following statements is true about gas? A. Its particles are very tiny B. Its particles can only vibrate about a fixed position C. It is easily compressed D. The distance between its particles are very close 7. Look at figure 1 below!

I

II

III

Figure 1. Which the following statement is correct? A. Figure 6.I, 6.II, 6.III shows the particles structure each of solid, liquid, and gas. B. Figure 6.I, 6.II, 6.III shows the particles structure each of liquid, solid, and gas. C. Figure 6.I, 6.II, 6.III shows the particles structure each of solid, gas, and liquid. D. Figure 6.I, 6.II, 6.III shows the particles structure each of gas, solid, and liquid. 8. When a matter change its shape, the density of that matter . . . . A. change C. increases B. fixed D. decreases 9. A cube with sides of 2 cm. If its mass is 240 g, what is the density of that cube? A. 30 g/cm3 C. 120 g/cm3 3 B. 40 g/cm D. 480 g/cm3 10. Read the following statement! 1. Solids will expand when they are heated. 2. Solids will contract when they are heated. 3. Solid will expand when they are cooled. 4. Solid will contract when they are cooled. 5. The volume of solids will bigger when they are heated. 6. The volume of solids will smaller when they are heated. Which the statements above are correct? A. 1, 4, and 5 B. 1, 4, and 6

C. 2, 3, and 5 D. 2, 3, and 6

11. The following tools work based on expansion, except . . . . A. bimetal C. thermometer B. thermostat D. balloon

12. If a metal is heated, it causes the metal to expand to any directions. It occurs because. . . . A. the atoms and molecules of the metal become bigger. B. the atoms and molecules of the metal vibrate faster than usual. C. amount of the atoms and molecules of the metal decrease. D. the metal is a solid. 13. Look at the figure 2 below!

Figure 2. Based on an experiment by using Musschenbroek set above, shows that the linear expansion of an object is influenced by . . . . A. the kinds of solid, the shape of an objects, the change of temperature. B. the kinds of solid, the shape of an object, the length of an object. C. the kinds of solid, the size of an object, the change of temperature. D. the kinds of solid, the length of an object, the change of temperature. 14. Figure 3 shows a metal bar is made of steel with the length 0.25 meters on 27ºC, is heated. ℓ Δℓ

Figure 3. If it is heated until 67ºC, how long is its expansion? (αSteel = 0.000011/ºC). A. 10 m C. 0.00011 m B. 6.75 m D. 0.000011 m 15. Figure 4 below shows electric wires being connected loosely between the poles.

electric wires pole

What is the main purpose of connecting the wires loosely? A. To allow the wires to be stronger B. To allow the wires to contract without snapping during a cold day 4 easily on a hot day C. To allow the wiresFigure to expand D. To allow the wires to last longer

16. What is the main function of the gaps between the railway tracks? A. Give space for the rails to expand during the hot days. B. Give space for the rails to curve down. C. Give space for the structureof the rails to be strong. D. Give space for the rails to bend. 17. Which the following statements are true about acid? A. Has sour taste, electrolyte solution, a corrosive substance. B. Has bitter taste, electrolyte solution, can be reacted by metal. C. Has salty taste, formed from acid and base reaction. D. Has sour taste. 18. Which the following substances are acid? 1. NaOH 2. HCl 3. H2SO4 4. CH3COOH A. 1 and 2 B. 2 and 4

C. 1, 2, and 3 D. 2, 3, and 4

19. Which the following substances are base? 1. NaOH 2. CH3COOH 3. KOH 4. NaCl A. 1, 2, and 3 B. 1 and 3

C. 2 and 4 D. 2, 3, and 4

20. Look at the figure below! Blue litmus

When blue litmus is plunged into the solution in the beaker glass, the colour of it changes become red. It shows that the solution is . . . . A. Neutral C. Base B. Acid D. Salt 21. A solution has the following data: sour taste, conducting electricity, and colouring litmus blue. The solution is predicated to be . . .. A. acid C. neutral B. base D. salt

22. A solution has the following data: bitter taste, conducting electricity, and colouring litmus red. The solution is predicated to be . . .. A. acid C. neutral B. base D. salt 23. Vinegar is an example of acid. The following identification is possible, except . . . A. conducting electricity B. can change red litmus turns to blue C. can change blue litmus turns to red. D. sour taste 24. Reaction of an acid and a base is showed below: Acid + base

………… + ……………

The result of that reaction . . . . A. Water + Hydrogen D. Acid + Water

C. Salt + water D. Salt + Hydrogen

25. Which of the following substances include natural indicators? A. litmus paper C. red methyl B. orange methyl D. purple cabbage II. Answer the following questions! 26. Mention three states of matter! 27. Explain, why solids have fixed volume and shape! 28. What is meant by density? 29. A student uses litmus paper to identify some solutions. Complete the following table! No 1. 2.

Solution Lemon juice Soap solution

30. Mention 3 properties of acid!

The change of colour Red litmus Blue litmus a. …..…………. b. …………….. c. ……………... d. ……………..