Physic Final Task

Final Task Subject : Science Level : 7

Choose a word or phrase to complete the following sentence 1.

2.

Which of the following is an example of a physical change? a. explosion

c. melting ice

b. corrosion

d. wood become charcoal

When paper becomes yellow-brown in color upon exposure to sunlight, what type of change is likely taking place? a. a physical change b. a chemical change c. neither a chemical nor a physical change d. both a chemical and physical change

3.

4.

Chemical reaction that results in a change of color happens when… a. iron become red after it is rusted b. apple become brown after it is cut c. orange is squeezed to get the juice with yellow color d. the color of a rainbow in the sky In the chemical reaction in which carbon, hydrogen and oxygen absorb heat and combine to form carbon dioxide and water, which of the following is considered to be a reactant? a. water

5.

b. oxygen

c. heat

d. carbon dioxide

An indicator gives red color to a solution of lime. It will also give red color to the solution of …………. a. soap

b. lemon

c. vinegar

d. sugar

6. In daily life we have found some acids in the composition, which of the following statement is not true?

7.

No a

Name Acetic acid

Obtained in Vinegar solution

b

Citric acid

Orange juice

c

Lactic acid

Cheese

d Malat acid Antacid Which one of the natural indicator………….. a. litmus paper

8.

b. tissue

c. hibiscus

A blue litmus paper remains blue when it is placed in… a. an acid solution only

c. an acid or base solution

b. base solution only

d. base or neutral solution

9. What does the activity in figure 1 below is shown.

d. sugar

a. Water occupies space b. Water has mass

c. Air has mass d. Air occupies space

10. How are liquids and gases similar? I Both have no definite volume. II Both have no definite shape. III Both have a definite surface area. a. I b. II

c. I and II

d. I, II and III

11. Which of the following statements is not true? a.

Gas particles have more energy than solid particles. Liquid particles have more energy than solid particles.

b. c. Liquid particles have more energy than gas particles. d. Gas particles have the highest energy content.

12. In which of the following situations would the principle of density be applied? a. Raising sunken treasure c. Flying a kite

b. Planning an astronaut’s suit

d. Swimming in a race

13. The density of alcohol is 0.8 g.cm . What is the mass of 50 cm of alcohol? a. 62.5 g b. 40 g c. 0.4 g -3

3

14. Which method of transportation uses the principle of density of matter? I. Jet aircraft II. Hot air balloons III. Submarines a. I b. III c. II and III

d. 0.016 g

d. I, II and III

15. The stone has a mass of 65 g and a volume of 100 cm3. What is the density of the stone? a. 0.65 g.cm-3 b. 6.5 g.cm-3 c. 65 g.cm-3

d. 650 g.cm-3

16. Which arrangement of these substances shows their densities in ascending order? a. Cork - wax – water – iron c. cork – wax – iron – water

b. Wax – cork – water – iron

d. iron – water – wax – cork

17. Figure 2 shows a steel bridge. C

Figure 2 Which part allows the bridge to expand easily on hot days? a. A b. B c. C d. D 18. Which of the following statements best explains how a bimetallic strip functions? a. Solids expand when heated b. Solids construct when heated c. The particles of matter increase in density when heated d. Different metals expand at different rates. 19. Which of the following is an application of expansion and construction of matter? a. Fixing telephone poles at regular interval b. Fixing the grill at the top part of an oven c. Fixing hot water pipes in a curved layout d. Fixing a plastic handle on a cooking pot 20. The linear expansion coefficient of metal is 3.106 / ºC. The length of the metal is 80 cm at 0 ºC. What is its length at 50 ºC? a. 80,012 cm b. 81,002 cm c. 82,010 cm d. 84,012 cm

21. A 0,2 kg of iron has specific heat capacity of 0,1 Kcal/kg ºC. If its temperature decrease from 75 ºC to 25 ºC, then the heat energy released is ….

a. 0,22 Kcal

b. 0,5 Kcal

c. 1 Kcal

d. 1,5 Kcal

22. What happens when cold milk is added to a cup of hot tea? 23.

a. The milk becomes colder. c. The tea becomes colder. b. The tea becomes hotter. d. The temperature of the tea does not change. Figure 3 shows a boy sitting next to a campfire to warm his body.

Figure 3 How does the heat from the campfire reach him? I By radiation II By convection

a. I

b. II 24. The unit of heat in International System is ….. a. kilogram b. Kelvin

III By conduction c. I and II

d. I, II and III

c. calorie

d. joule

25. 500 gram of copper absorbs heat energy of 2.250 joule. What is the change of temperature of the copper? (the specific heat capacity of copper is 380 J/Kg. K) a. 118 K

b. 11,8 K

c. 1,18 K

d. 0,118 K