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Science Quiz 2

Total questions: 163

Worksheet time: 3hrs 43mins

Name
Class
Date
1.

Where is the villi ?

a)

At the wall of small intestine

b)

Inside the blood capillary

c)

At the wall of large intestine

d)

Inside lacteal

2.

What is the function of villi ?

a)

To increase the surface area for the process of absorption of digested food

b)

To decrease the surface area for the process of absorption of digested food

c)

To create another small intestine

3.

What can blood digests ?

a)

Fat-soluble nutrients

b)

Water-soluble nutrients

c)

Both

4.

After lacteal absorbs digested fat in the wall of small intestine , where is the nutrients first transfers to ?

a)

Lymphatic system

b)

Blood circulatory system

c)

Digestive system

d)

Has no fixed direction

5.

Is the wall of villus function to increace the rate of absorption of the products of digestion ?

a)

Yes

b)

No

6.

Why does our small intestine have more blood vessels than our stomach ?

4 lines
7.

What will Iodine solution changes its colours to when it reacts with starch ?

a)

brown

b)

yellow precipitate

c)

brick-red precipitate

d)

dark-blue

8.

What is the orignal colour for Benedict's solution ?

a)

brown

b)

blue

c)

brick-red precipitate

d)

transparent

9.

In the Visking Tube experiment , what is represented by the Visking Tube ?

a)

small intestine

b)

stomach

c)

large intestine

d)

blood

10.

In the Visking Tube experiment , what is represented by distilled water ?

a)

small intestine

b)

stomach

c)

large intestine

d)

blood

11.

What is the process of distributing the end products of digestion for the use of cell called ?

a)

Neutralisation

b)

Titration

c)

Assimilation

d)

Tyndall effect

12.

Which of the syestem is exclude to ensure the digested food molecules reach the cells of the body ?

a)

Digestive system

b)

Blood circulatory system

c)

Assimilation

d)

Lymphatic system

13.

Which products are use to form component of cells such as antibody ?

a)

Glucose

b)

Fatty acid

c)

Amino acid

d)

Protein

14.

Are fatty acid and glycerol works as a heat insulator in our body ?

a)

Yes

b)

No

c)

Prehaps

15.

Which of the substances below cannot be digested by small intestine ? (Choose TWO)

a)

Fibres

b)

Dead cells

c)

VItamin C

d)

Milk

16.

Where does faeces stored ?

a)

Rectum

b)

Small intestine

c)

Mouth

d)

Anus

17.

Which part of the body eliminates faeces ?

a)

Rectum

b)

Small intestine

c)

Mouth

d)

Anus

18.

What is the main substance that large intestine reabsorbs ?

a)

Water

b)

Vitamin

19.

What is a disease ?

a)

A hyperactive condition of body or mind

b)

An abnormal condition of body or mind

c)

A normal condition of body or mind

d)

All can be accepted

20.

Diseases can be classified into two types ? What are they ?

a)

Infectious disease

b)

Non-infectious disease

c)

Infective disease

d)

Non-infective disease

21.

Can infectious diseases spread ?

a)

Yes

b)

No

22.

Can non-infectious diseases spread ?

a)

Yes

b)

No

23.

What is the reason that cause non-infectious disease ? (Choose 2)

a)

Genetic factor

b)

Daily lifestyle

c)

Transmission of pathogens

d)

Coughing

24.

Choose 3 of the non-infectious disease.

a)

Cancer

b)

Flu

c)

Hypertension

d)

Diabetes

e)

Tuberculosis

25.

Choose 2 of the infectious disease.

a)

Cancer

b)

Flu

c)

Hypertension

d)

Diabetes

e)

Tuberculosis

26.

What is the animal that spread infectious diseases are called ?

(a)  

27.

Is protozoa 原生动物 a pathogen ?

a)

Yes

b)

No

28.

There are 2 ways of transmission of airborne diseases. What are they ?

a)

Droplet transmission

b)

Saliva transmission

c)

Spit transmission

d)

Dust transmission

29.

The infectious disease spread by bacteria that dried up and form spores . What is the way of transmission ?

a)

Droplet transmission

b)

Saliva transmission

c)

Spit transmission

d)

Dust transmission

30.

Choose 2 precautionary steps that need to be taken to prevent transmission of airborne diseases .

a)

Do not spit everywhere

b)

Stay in a crowded place everyday

c)

Ensure the place u live gets enough light

d)

Don't cover your mouth when coughing or sneezing

31.

Example of airborne disease (Choose 2)

a)

Flu

b)

Severe Acute Respiratory Syndrome (SARS)

c)

Cholera

d)

Typhoid

32.

How can waterborne diseases spread ?

a)

Drinking contaminated water

b)

Over-consumption of water

c)

Droughts

d)

Place with good sanitation

33.

Choose 4 reason that can spread waterborne diseases .

a)

Inadequate water supply

b)

Poor sanitation

c)

Drinking of contaminated water

d)

Floods

e)

Over-consumption of water

34.

Why should we boil the drinking water before we drink it ?

a)

To kill microorganisms

b)

To heat up the water

c)

For fun

d)

Because of obsessive-compulsive

35.

What should we add in the swimming pool before using ? ( chlorine / cholera )

(a)  

36.

What type of disease is typhoid and amoebic dysentery ?

a)

Airborne disease

b)

Waterborne disease

c)

Vector-borne disease

d)

Disease infected through contact

37.

Which of the diseases are caused by fungi ? ( Choose 2 )

a)

Tinea

b)

Tenia

c)

Ringworm

d)

Malaria

38.

How can diseases like syphilis and gonorrhoea can spread ? (Main reason)

a)

Through sexual intercause

b)

Through drinking of contaminated water

c)

Keep sneezing

d)

Drug addicts

39.

Pathogens of syphilis and gonorrhoea are present in body fluids such as ? (Choose 2)

a)

Semen

b)

Concrete

c)

Vaginal fluid

d)

Vaginal

40.

What virus cause AIDS ?

a)

HIV

b)

VIG

c)

COVID-19

d)

SARS

41.

Animals that transmit pathogens are called ?

(a)  

42.

How Malaria , Dengue and Zika diseases are spread?

a)

Mosquito bite

b)

Contaminated food and water

43.

How Cholera ,Typhoid and Leptospirosis diseases are spread?

a)

Mosquito bite

b)

Contaminated food and water

44.

Which vector spread Leptospirosis ?

a)

Leptospira sp. bacteria

b)

Rat

c)

Salmonella typhi bacteria

d)

Cat

45.

Why did the mosquito secretes the saliva when sucking the blood ?

a)

To prevent blood clotting

b)

For fun

c)

Too much of saliva inside its mouth

46.

Which of the following refers to the primary stage of prevention of infectious disease ? (Choose 3)

a)

Improving health by improving yourself hygiene

b)

Getting vaccines and immunisation

c)

Do check-up frequently

d)

Control vector populations

47.

How many line of body defense are consist ?

a)

2

b)

3

c)

4

d)

1

48.

Is skin a tough layer that is difficult to be penetrated by microorganisms ?

a)

Yes

b)

No

49.

Which of the substance secreted by the skin can kill microorganisms ? (Choose 2)

a)

Sweat

b)

Sebum

c)

Semen

d)

Antibody

50.

What mucous membrane lines ?

a)

Digestive tract

b)

Respiratory tract

c)

Blood capilary

d)

Small intestine

51.

Microorganisms that enter the respiratory tract are filtered by ______________ and trapped by mucous lining in the _____________ . Choose the correct answer .

a)

nasal skin ; nasal cavity

b)

nasal cavity ; nasal hairs

c)

nasal wound ; nasal cavity

d)

nasal hairs ; nasal cavity

52.

What is the process that white blood cells engulf and digest the pathogens called ?

a)

Phagocytosis

b)

Photosynthesis

c)

Respiration

d)

Hypothesis

53.

What is immunity means ?

a)

The ability of the body system to resist pathogens before it is infected

b)

A protein that is produced by the white blood cells in response to antigens

c)

A foreign substance that comes from outside the body and induces the production of antibody

d)

A clear liquid in the blood that contains antibodies to prevent diseases

54.

What is antibody ?

a)

The ability of the body system to resist pathogens before it is infected

b)

A protein that is produced by the white blood cells in response to antigens

c)

A foreign substance that comes from outside the body and induces the production of antibody

d)

A clear liquid in the blood that contains antibodies to prevent diseases

55.

What is antigen ?

a)

The ability of the body system to resist pathogens before it is infected

b)

A protein that is produced by the white blood cells in response to antigens

c)

A foreign substance that comes from outside the body and induces the production of antibody

d)

A clear liquid in the blood that contains antibodies to prevent diseases

56.

Is pathogens a type of antibody ?

a)

Yes

b)

No

57.

White blood cells engulf and digest pathogens by using ___________ .

a)

enzymes

b)

antigens

c)

antibodies

d)

vaccines

58.

What is immunisation ?

a)

The ability of the body system to resist pathogens before it is infected

b)

Effort to stimulate the body defense against infections by injecting vaccines

c)

A foreign substance that comes from outside the body and induces the production of antibody

d)

A clear liquid in the blood that contains antibodies to prevent diseases

59.

What is vaccine ?

a)

The ability of the body system to resist pathogens before it is infected

b)

Effort to stimulate the body defense against infections by injecting vaccines

c)

A substance that contains antigens from part of a weakened or dead virus / bacterium

d)

A clear liquid in the blood that contains antibodies to prevent diseases

60.

BCG is a vaccine that gives protection against what disease ?

a)

Tuberculosis

b)

Flu

c)

COVID-19

d)

Diphtheria

61.

Which is the two types of immunity ?

a)

Passive immunity

b)

Active immunity

c)

Hyperactive immunity

d)

Natural immunity

62.

How immunities can be obtained ?

a)

Artificaly

b)

Artificially

c)

Naturally

d)

Naturelly

63.

What is the characteristics of passive immunity ?

a)

Body gains antibody from external sources

b)

Body produces its own antibodies when stimulated by antigens

64.

What is the characteristics of active immunity ?

a)

Body gains antibody from external sources

b)

Body produces its own antibodies when stimulated by antigens

65.

Name the type of immunity of the picture

(a)  

66.

Name the type of immunity of the picture

(a)  

67.

Name the type of immunity of the picture

(a)  

68.

Name the type of immunity of the picture

(a)  

69.

How can baby obtain antibody ?

a)

From breast milk

b)

From the mother's blood that flow across placenta

c)

Produces by his own

d)

Injection of antiserum

70.

What is antiserum ?

a)

The ability of the body system to resist pathogens before it is infected

b)

Effort to stimulate the body defense against infections by injecting vaccines

c)

A substance that contains antigens from part of a weakened or dead virus / bacterium

d)

A clear liquid in the blood that contains antibodies to prevent diseases

71.

Will antiserum interrupted the patient's immune system when fighting pathogens ?

a)

Yes

b)

No

72.

Which type of immunity are fast and temporary?

a)

Passive natural immunity

b)

Passive artificial immunity

c)

Active natural immunity

d)

Active artificial immunity

73.

Which type of immunity are slow but lasts long?

a)

Passive natural immunity

b)

Passive artificial immunity

c)

Active natural immunity

d)

Active artificial immunity

74.

Which type of immunity occurs when a person recovers from an infection ?

a)

Passive natural immunity

b)

Passive artificial immunity

c)

Active natural immunity

d)

Active artificial immunity

75.

Which type of immunity occurs when a vaccine is injected ?

a)

Passive natural immunity

b)

Passive artificial immunity

c)

Active natural immunity

d)

Active artificial immunity

76.

Choose 2 reason that causes that weaken the immune system .

a)

Exposure to polluted air and pesticides

b)

Stress

c)

Not smoking

d)

Doing periodic health examination

77.

Choose 2 ways that can strengthen the immune system .

a)

Exposure to polluted air and pesticides

b)

Stress

c)

Not smoking

d)

Doing periodic health examination

78.

What is the cause of allergic ?

a)

Allergen

b)

Pathogen

c)

Vector

d)

Antiserum

79.

Choose all the properties of pure water .

a)

Boils at 100°C

b)

Freezes at 0°C

c)

Colourless

d)

Density at 1g/ cm^3

e)

pH value at 8

80.

Choose all the properties of pure water .

a)

Odourless

b)

Tasteless

c)

Exists as liquid at room temperature

d)

Have high surface tension

e)

pH value at 7

81.

Cohesive force between water molecules and adhesive force between water molecules and the cell walls of xylem allow water to be drawn up from the roots to the leaves of the plant . What is the phenomenon is known as ?

(a)  

82.

What is the attractive force between same molecules ?

a)

Cohesive force

b)

Adhesive force

83.

What is the attractive force between different molecules ?

a)

Cohesive force

b)

Adhesive force

84.

Which of the process absorb heat ?

a)

Melting

b)

Boiling

c)

Freezing

d)

Condensation

85.

Which of the process release heat ?

a)

Melting

b)

Boiling

c)

Freezing

d)

Condensation

86.

Is water a compound ?

a)

Yes

b)

No

87.

Water is made up of ?

a)

Oxygen

b)

Hydrogen

c)

Nitrogen

d)

Carbon monoxide

88.

What is the method we can use to determine the composition of water ?

(a)  

89.

What is the ration between hydrogen gas and oxygen gas ?

(a)  

90.

What is the use of putting dilute hydrochloric acid into distilled water during electrolysis ?

a)

To reduce the electric current

b)

Prevent yourself from static

c)

To enable the water to conduct electric

d)

For nothing

91.

Which gas is produced at positive terminal ?

a)

Hydrogen gas

b)

Oxygen gas

c)

Sulfuric acid

92.

Which gas is produced at negative terminal ?

a)

Hydrogen gas

b)

Oxygen gas

c)

Sulfuric acid

93.

Which statement is correct ?

a)

Water is made up of one oxygen molecules and two hydrogen molecules

b)

Water is made up of one oxygen atom and two hydrogen atoms

c)

Water is a mixture

d)

Water is made up of one hydrogen atom and two oxygen atoms

94.

What is the name of positive terminal of a battery ?

(a)  

95.

What is the name of negative terminal of a battery ?

(a)  

96.

How to determine whether there is hydrogen ? (Choose TWO)

a)

Lighten wooden splinter extinguished

b)

"pop" sound can be heard

c)

Glowing wooden splinter can rekindles

97.

How to determine whether there is oxygen ? (Choose ONE)

a)

Lighten wooden splinter extinguished

b)

"pop" sound can be heard

c)

Glowing wooden splinter can rekindles

98.

What is the effects of impurities on the melting and boiling point ? (Choose THREE)

a)

Lowers the melting point

b)

Lowers the freezing point

c)

Increases the boiling point

d)

Lowers the boiling point

99.

What is the physical characteristics that can change in the presence of impurities ?

a)

Taste

b)

Smell

c)

Colour

d)

Quantities of water molecules

100.

Choose 2 characteristics of evaporation of water

a)

Only occur at 100°C

b)

Occur at any temperature

c)

Occur only at the surface of water

d)

Occur at the bottom of water

101.

Why molecules of water at the surface can move master and escape into the air ?

a)

Have high kinetic energy

b)

Have high heat energy

c)

Have high elastic energy

d)

Have low movement speed of molecules

102.

Choose the 4 factor affecting the rate of evaporation of water

a)

Humidity

b)

Surrounding temperature

c)

Exposed surface area of water

d)

Movement speed of air

103.

Why dry air can increase the evaporation of water ?

a)

Because it contains more water molecules

b)

Because it contains more water vapour

c)

Because it contains less air molecules

d)

Because it contains less water molecules

104.

What is the function of anhydrous calcium chloride 无水氯化钙 in the experiment ?

a)

To absorb heat from the surrounding

b)

To absorb water vapour

c)

To absorb water vapour in the air

d)

To lead the water for flowing out of the beaker

105.

What will cobalt chloride paper changes its colour to when wet ?

a)

Pink

b)

Blue

c)

Brick-red precipitate

d)

Yellow

106.

What is solute ?

a)

A substance that can dissolve in a liquid

b)

A liquid that dissolves a substance

c)

The mixture formed when a solute dissolves in a solvent

107.

What is solvent ?

a)

A substance that can dissolve in a liquid

b)

A liquid that dissolves a substance

c)

The mixture formed when a solute dissolves in a solvent

108.

What is solution ?

a)

A substance that can dissolve in a liquid

b)

A liquid that dissolves a substance

c)

The mixture formed when a solute dissolves in a solvent

109.

1.Less amount of solute in the solvent

2.Can dissolve more solute

----------------------------------

Determine the type of solution

a)

Dilute solution

b)

Concentrated solution

c)

Saturated solution

110.

1.More amount of solute in the solvent

2.Can dissolve less solute

----------------------------------

Determine the type of solution

a)

Dilute solution

b)

Concentrated solution

c)

Saturated solution

111.

1.Excess amount of solute in the solvent

2.Cannot dissolve any more solute and will form precipitate

----------------------------------

Determine the type of solution

a)

Dilute solution

b)

Concentrated solution

c)

Saturated solution

112.

What is the type of the solution found in the Dead Sea ?

a)

Dilute solution

b)

Concentrated solution

c)

Saturated solution

113.

What is solution ? (Choose 2)

a)

A clear mixture formed when a solute dissolves in a solvent

b)

A cloudy mixture formed from undissolved solute particles in a solvent

c)

A mixture that has uniform colour and appearance

d)

The mixture will settle if left undisturbed and leave residue when filtered

114.

What is suspension ? (Choose 2)

a)

A clear mixture formed when a solute dissolves in a solvent

b)

A cloudy mixture formed from undissolved solute particles in a solvent

c)

A mixture that has uniform colour and appearance

d)

The mixture will settle if left undisturbed and leave residue when filtered

115.

Is solution transparent ?

a)

Yes

b)

No

116.

Is medicine a suspension ?

a)

Yes

b)

No

117.

What is meant by solubility ?

a)

The maximum amount of the solute that can dissolve 100 ml of solvent at a specific temperature

b)

The minimum amount of the solute that can dissolve 100 ml of solvent at a specific temperature

c)

The optimum amount of the solute that can dissolve 100 ml of solvent at a specific temperature

d)

The maximum amount of the solute that can dissolve 250 ml of solvent at a specific temperature

118.

What can affect the rate of solubility ?

a)

Temperature

b)

Rate of stirring

c)

Size of solute

d)

Exposed surface area of water

119.

The smaller the size of the solute , the bigger the total surface area that is exposed to the solvent particles . Is the statement true ?

a)

True

b)

False

120.

What is colloid ? (Choose 2)

a)

Are intermediate between a solution and a suspension

b)

A cloudy mixture formed from undissolved solute particles in a solvent

c)

A mixture that has uniform colour and appearance

d)

A mixture of two or more solutes dispersed evenly in a solvent

121.

How can you determine whether it is a colloid ?

a)

Through Tyndall effect

b)

Through electrolysis

c)

Through stirring the mixture

122.

Choose the example of emulsion (Choose 2)

a)

Mayonnaise

b)

Milk

c)

Shaving cream

d)

Carbonated drink

123.

All the substances below can dissolved in water, except ?

a)

Fertilisers

b)

Soft drinks

c)

Detergent

d)

Perfume

124.

What is the base of organic solvent ?

a)

Carbon

b)

Oxygen

c)

Acid

d)

Alkali

125.

What is the organic solvent for lamp oil ?

a)

Kerosene

b)

Acetone

c)

Turpetine

d)

Ether

e)

Alcohol

126.

What is the characteristics of organic solvent ?

a)

Volatile

b)

Active

c)

Corrosive

d)

Noxious

127.

Are organic solvent harmful to health if used commonly ?

a)

Yes

b)

No

128.

Choose 4 water purification methods

a)

Boiling

b)

Chlorination

c)

Filtration

d)

Distillation

e)

Detoxification

129.

What project used in Singapore to recycle sewage into drinking water and for industrial uses ?

a)

NEwater

b)

Malaysia Airlines Holdings Berhad

c)

Suruhanjaya pengangkutan Awam Darat Malaysia

d)

Malindo Airline

130.

What is the purpose for the first filtration process ?

a)

Remove large suspended particles

b)

Increase oxygen content to get rid of unpleasant smell and taste

c)

Removes remaining suspended particles through sand filters

d)

Suspended particle deposit at the bottom of the tank

131.

What is the purpose for the oxidation process ?

a)

Remove large suspended particles

b)

Increase oxygen content to get rid of unpleasant smell and taste

c)

Removes remaining suspended particles through sand filters

d)

Suspended particle deposit at the bottom of the tank

132.

What is added in the coagulation tank ? (Choose 2)

a)

Alum

b)

Slaked lime

c)

Chlorine

d)

Sodium fluoride

133.

What is the usage of alum ?

a)

To make mud particles stick together and sink to the bottom of the tank

b)

To reduce the acidity of water

c)

To kill microorganism in the water

d)

To prevent tooth decay

134.

What is the usage of slaked lime ?

a)

To make mud particles stick together and sink to the bottom of the tank

b)

To reduce the acidity of water

c)

To kill microorganism in the water

d)

To prevent tooth decay

135.

What is the usage of chlorine ?

a)

To make mud particles stick together and sink to the bottom of the tank

b)

To reduce the acidity of water

c)

To kill microorganism in the water

d)

To prevent tooth decay

136.

What is the usage of sodium fluoride ?

a)

To make mud particles stick together and sink to the bottom of the tank

b)

To reduce the acidity of water

c)

To kill microorganism in the water

d)

To prevent tooth decay

137.

What is the main water pollutants ? (Choose 4)

a)

Domestic waste

b)

Industrial waste

c)

Chemicals in agriculture

d)

Oil spillage

e)

Use of biodegradable fertilisers

138.

What is the origin of the word 'acid' ?

a)

Achidus

b)

Acidus

c)

Aqali

d)

Alqali

139.

What is the origin of the word 'alkali' ?

a)

Achidus

b)

Acidus

c)

Aqali

d)

Alqali

140.

Choose all the properties of acid

a)

pH value less than 7

b)

taste sour

c)

corrosive

d)

Turns blue litmus paper red

e)

react with metals to produce hydrogen gas / hydrogen ions

141.

Choose all the properties of alkali

a)

pH value more than 7

b)

taste bitter

c)

corrosive

d)

Turns res litmus paper blue

e)

react with metals to produce hydrogen gas / hydrogen ions

142.

Why acidic or alkaline substance dont change the colour of the indicator in the form of powder ?

a)

Because acid and alkali need water to show its properties

b)

No luck when doing experiment

c)

Someone controlling the experiment

d)

Too much of powder

143.

What is the colour of phenolphtalein when it touched acid substance?

a)

Pink

b)

Blue

c)

Yellow

d)

Red

e)

Colourless

144.

What is the colour of universal indicator when it touched acidic substance?

a)

Pink

b)

Blue

c)

Yellow

d)

Red

e)

Colourless

145.

What is the colour of methyl orange when it touched alkaline substance?

a)

Pink

b)

Blue

c)

Yellow

d)

Red

e)

Colourless

146.

What is the colour of red litmus paper when it touched alkaline substance?

a)

Pink

b)

Blue

c)

Yellow

d)

Red

e)

Colourless

147.

What is the colour of blue litmus paper when it touched acidic substance?

a)

Pink

b)

Blue

c)

Yellow

d)

Red

e)

Colourless

148.

What is the range of pH value ?

a)

1-13

b)

7-14

c)

1-14

d)

0-14

149.

Choose 2 correct statement

a)

The lower the pH value , the more acidic the substance is

b)

The lower the pH value , the more alkaline the substance is

c)

The higher the pH value , the more acidic the substance is

d)

The higher the pH value , the more alkaline the substance is

150.

What is meant by 7 in pH scale ?

a)

Neutral

b)

Acidic

c)

Alkaline

d)

Dilute

151.

Which acid is used to make fizzy drink ?

a)

Carbonic acid

b)

Sulphuric acid

c)

Ascorbic acid

d)

Vinegar

152.

Which acid is used to make Vitamin C pills ?

a)

Carbonic acid

b)

Sulphuric acid

c)

Ascorbic acid

d)

Vinegar

153.

Which alkali is used to make fertiliser ?

a)

Potassium hydroxide

b)

Sodium hydroxide

c)

Sodium fluoride

d)

Ammonia

154.

Which alkali is used to make detergent ?

a)

Potassium hydroxide

b)

Sodium hydroxide

c)

Sodium fluoride

d)

Ammonia

155.

The reaction between an acid and alkali produces salt and water .What is reaction called ?

a)

Titration

b)

Filtration

c)

Neutralisation

d)

Oxidation

156.

Hydrochloric acid + Sodium hydroxide =

a)

Sodium chloride + Water

b)

Potassium suphate +Water

c)

Sodium nitrate + Water

157.

Sulphuric acid + Potassium hydroxide =

a)

Sodium chloride + Water

b)

Potassium suphate +Water

c)

Sodium nitrate + Water

158.

Nitric acid + Sodium hydroxide =

a)

Sodium chloride + Water

b)

Potassium suphate +Water

c)

Sodium nitrate + Water

159.

Teeth will inhabited by bacteria that produce acid . Is the statement true ?

a)

True

b)

False

160.

Healthy hair have concentrated acid . Is the statement true?

a)

True

b)

False

161.

How can acidic soil treated ?

a)

Add slaked lime

b)

Add toothpaste

c)

Add vinegar

162.

What kind of substance is fabric softeners ?

a)

Alkaline substance

b)

Acidic substance

163.

What is the method used to carry out neutralisation ?

a)

Titration

b)

Metabolism

c)

Oxidation

d)

Coagulation

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