Workbook

Question 1

The study of the cause of flu is related to medicine.

Answer 1

True

Question 2

Scientific discoveries and inventions are always good for humans.

Answer 2

False

Question 3

Renewable resources can be replenished continuously in Nature.

Answer 3

True

Question 4

The problem of war can be solved using scientific knowledge.

Answer 4

False

Question 5

All scientific investigations involve designing and doing experiments.

Answer 5

False

Question 6

Model building is a type of scientific investigations.

Answer 6

True

Question 7

In a fair test, the variable that we are going to change is called the dependent variable.

Answer 7

False.

Question 8

Science is a type of scientific investigation which involves comparing the similarities and differences between objects, and sorting them into groups.

Answer 8

False. Classifying.

Question 9

In science, diagrams can represent objects that are too small or too big to see. They are usually used to show the structures of objects.

Answer 9

False. model

Question 10

We should wear safety goggles before entering the laboratory.

Answer 10

False.

Question 11

We should read safety precautions before doing an experiments.

Answer 11

True

Question 12

A water-type fire extinguisher can put out all kinds of fires.

Answer 12

False.

Question 13

A spatula is used to transfer a small amount of solid.

Answer 13

True

Question 14

All laboratory apparatus is made of glass.

Answer 14

False.

Question 15

We should use a glass rod to stir a hot liquid.

Answer 15

True.

Question 16

When the air hole is open, the flame will be yellow.

Answer 16

False. Blue

Question 17

When the air hole is closed, it is quiet.

Answer 17

True.

Question 18

Water type fire extinguishers can be used on fires caused by burning oil.

Answer 18

False.

Question 19

If an investigation is not a fair test, no conclusion can be drawn.

Answer 19

True.

Question 20

When water freezes, it releases energy.

Answer 20

True.

Question 21

Evaporation and condensation only take place at fixed temperature.

Answer 21

False.

Question 22

The water cycle keeps the total amount of water on Earth constant.

Answer 22

True.

Question 23

The higher the humidity, the higher the rate of evaporation.

Answer 23

False.

Question 24

Water is called the universal solvent because it can dissolve all substances.

Answer 24

False. Many/ different (but not all)

Question 25

The rate of dissolving increases when the solute is in powdered form.

Answer 25

True.

Question 26

The amount of substance that can dissolve in a given amount of water is different for different substances.

Answer 26

True.

Question 27

The solubility of a substance increases as the temperature increases.

Answer 27

False. (can increase or decrease with temperature)

Question 28

The solubility of a substance in water changes with temperature.

Answer 28

True.

Question 29

Substances can be dissolved by stirring the solution more vigorously.

Answer 29

False. Stirring does not affect the solubility of a substance -> only cause the substance to dissolve faster

Question 30

Amoeba and E.coli are the microorganisms commonly found in natural water.

Answer 30

True.