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Science Junior 2

Total questions: 108

Worksheet time: 2hrs 45mins

Name
Class
Date
1.

What are the organisms that cause diseases?

(a)  

2.

what are the TWO ways of transmission of airborne diseases?

a)

droplet transmission

b)

spray transmission

c)

dust transmission

d)

spit transmission

3.

What are the reasons of transmission of waterborne diseases? (choose two)

a)

poor sanitation

b)

physical contact

c)

inadequate food supply

d)

flood

e)

earthquake

4.

What is the virus that causes AIDS?

a)

CIV

b)

covid-19

c)

HIV

d)

GIV

5.

What diseases are brought by fungi? (choose 2)

a)

tenia

b)

cholera

c)

tinea

d)

ring worm

6.

syphilis and gonorrhoea can spread though activity A. What is activity A?

a)

sexual intercourse

b)

swimming in a pool with poor sanitation

c)

eating contaminated water or drinking contaminated food

d)

touching the infected skin

7.

Pathogens of diseases like syphilis and gonorrhoea are present in X. Please list one example of X.

(a)  

8.

What are the animals that transmit diseases called?

(a)  

9.

We can add substance Y into swimming pools and water substances to kill the microorganisms. What is substance Y?

(a)  

10.

Tchaikovsky is sick and showing symptoms of diarrhea and vomiting. What disease he might be infected by?

a)

Zika

b)

Typhoid

c)

Leptospirosis

d)

Cholera

11.

Why do mosquitoes secretes saliva when sucking the blood of a person?

a)

to prevent blood clotting

b)

to escape easily after sucking the blood

c)

to prevent pathogens from entering the person's body

d)

for fun

12.

Which options below are non-specific body defence mechanism? (choose three)

a)

phagocytosis

b)

skin

c)

body immune system

d)

mucous membrane

13.

Please identify whether the statement below is true or false: Microorganisms that enter the respiratory tract are filtered by nasal cavity and trapped by mucous lining the nasal hairs

a)

True

b)

False

14.

X is a foreign substance that comes from outside of the bloodstream and induces the production of Y. What is X?

a)

Antibody

b)

Antigen

c)

Antiserum

d)

Antiseptic

15.

Immunisation is an effort to simulate the body defence against infections in babies, children and adults by injecting Z. What is Z?

a)

antiserums

b)

anaesthetic

c)

vaccines

d)

antibody

16.

What type of artificial immunity is the graph shown above? How does it occur?

a)

artificial active; when antiserum is injected into the patient's body

b)

artificial active; when vaccine is injected into the patient's body

c)

artificial passive; when antiserum is injected into the patient's body

d)

artificial passive; when vaccine is injected into the patient's body

17.

How do babies obtain natural passive immunity?

a)

Vaccination.

b)

From breast milk.

c)

From the mother's blood that flows across the placenta.

d)

They automatically gain it when they're born.

18.

What is the cause of allergics?

(a)  

19.

Please choose the properties of water.

a)

colourless

b)

pH value is 7

c)

odourless

d)

tasteless

20.

Please identify if the statement below is true or false.

Water has low surface tension.

a)

True

b)

False

c)

Unsure

21.

Surface tension is a result of X between the molecules of water.

What is X?

(a)  

22.

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

a)

caterpillar action

b)

capillary action

c)

caterpillary action

d)

calories action

23.

What is the attractive force between different molecules?

(a)  

24.

What is the process of solid turning into liquid?

a)

melting

b)

freezing

c)

boiling

d)

condensation

25.

Which of the processes below happens when the heat is absorbed?

a)

melting

b)

evaporation

c)

boiling

d)

sublimation

26.

Is water a compound?

a)

Yes

b)

No

c)

Unsure

27.

We can determine the composition of elements in a water molecule through method Y.

What is method Y?

(a)  

28.

During electrolysis, oxygen gas is produced at the anode while hydrogen gas is produced at the cathode.

Is the statement above true?

a)

Yes

b)

No

c)

Unsure

29.

A water molecule is made up of......

a)

one hydrogen atom and one oxygen atom

b)

two hydrogen atoms and two oxygen atoms

c)

one oxygen atom and three hydrogen atoms

d)

one oxygen atom and two hydrogen atoms

30.

What is the electrode that is connected to the positive terminal of a battery?

(a)  

31.

What is the electrode that is connected to the negative terminal of a battery?

(a)  

32.

Why is hydrochloric acid added into the water during electrolysis?

a)

to conduct the electric current

b)

to reduce the electric current

c)

to sanitise the water

d)

to prevent microorganisms from disturbing the experiment

33.

What is the ratio of the volume of Hydrogen and Oxygen during electrolysis?

(a)  

34.

Salt lowers the melting point of ice and increases the boiling point of water.

Is the statement above true?

a)

Yes

b)

No

c)

Unsure

35.

Please choose the characteristics of water that can change in the presence of impurities. (choose three)

a)

taste

b)

smell

c)

temperature

d)

colour

36.

Evaporation of water is a process that happens at the surface of water and occurs at a specific temperature.

Is the statement above true?

a)

Yes

b)

No

c)

Unsure

37.

Why do the molecules of water can move faster and escape into the air easily when they are at the surface?

a)

they are being pulled by the energy around the surface

b)

they have high kinetic energy

c)

they are being pushed by the water molecules below the surface

d)

unexplainable

38.

Please list ONE factor that can affect the rate of evaporation of water. (texts referred to textbook) (still correct if necessary)

(a)  

39.

What is the substance that can dissolve in a liquid?

a)

solute

b)

solvent

c)

suspension

d)

colloid

40.

This type of solution has more amount of solute in the solvent and can dissolve less solute. What type of solution is this?

a)

dilute solution

b)

concentrated solution

c)

saturated solution

d)

suspended solution

41.

What type of solution is found in the Dead Sea?

a)

dilute solution

b)

concentrated solution

c)

saturated solution

d)

salty solution

42.

A cloudy mixture formed from undissolved solute particles in a solvent.

a)

suspension

b)

emulsion

c)

colloid

d)

solution

43.

What are the characteristics of a solution? (choose three)

a)

size of the particles is large enough to prevent light from passing through suspension

b)

formed when a solute dispersed throughout a solvent

c)

has a uniform colour and appearance

d)

the uniform colour of the mixture makes the solution appear transparent

44.

Are chalk powders soluble in water?

a)

Yes

b)

No

c)

Unsure

d)

Tell me whyyyyyyyyyyy

45.

Suspensions won't settle if left undisturbed and leave residue when filtered.

Is the statement above correct?

a)

Yes

b)

No

c)

Unsure

d)

Perhaps

46.

Z of a solute is the maximum amount of the solute that can dissolve in 100ml of solvent at a specific temperature.

What is Z?

(a)  

47.

All of the statements below are correct, except......

a)

the bigger the size of solute, the bigger the total surface area that is exposed to the solvent particles

b)

the smaller the size of solute, the bigger the total surface area that is exposed to the solvent particles

c)

high temperature of solvent cause the particles to move rapidly

d)

rate of stirring of solvent cause the particles to move rapidly

48.

What is a mixture of two or more solutes that dispersed evenly in a solvent called?

(a)  

49.

Which mixture is the clearest mixture below?

a)

colloid

b)

suspension

c)

solution

50.

Solvent X is known as a universal solvent.

What is solvent X?

(a)  

51.

Choose two substances below that can be dissolved by alcohol.

a)

perfume

b)

antiseptic

c)

ether

d)

antigen

52.

What is the organic solvent of lamp oil?

(a)  

53.

Most of the organic solvents aren't harmful to health.

Is the statement above true?

a)

Yes

b)

No

54.

All of the statements of water purification methods below are wrong, except......

a)

Boiling-To heat up the water

b)

Chlorination- To separate dissolved substances

c)

Filtration- to separate suspended particle from liquid

d)

Distillation- to separate suspended particles and dissolved substances

55.

Singapore has limited water supply. The country uses modern technologies to recycle sewage into drinking water and for industrial uses. What is the project known as?

a)

NEWater

b)

WateRecycling (WR)

c)

ModernTechWater (MTW)

d)

Never gonna give you up (Rick Astley)

56.

What is the water purification process that removes large suspended particles?

a)

coagulation

b)

filtration

c)

oxidation

d)

Sedimentation

57.

In the water purification process of coagulation, what substance is added to reduce the acidity of water?

(a)  

58.

In the water purification process chlorination and fluoridation, what substance is added to prevent tooth decay?

(a)  

59.

What is the fourth process of the water purification process?

a)

Oxidation

b)

Coagulation

c)

Filtration

d)

Sedimentation

60.

What is the last process of the water purification process?

a)

Chlorination and fluoridation

b)

Chlorination and flouridation

c)

Oxidation

d)

Filtration

61.

What is the main water source in Malaysia?

(a)  

62.

What are the ways to overcome the water pollutant problems of domestic waste?

a)

upgrade sewerage systems statewide

b)

educate people on how to manage rubbish correctly

c)

improve sanitation facilities in rural areas

d)

enforce laws

63.

To overcome the water pollution of chemical in agriculture, what kind of fertilisers/pesticides should farmers use? (this answer is referred to textbook, necessary answers should be accepted but i can't promise your answer is correct)

(a)  

64.

The word 'acid' comes from the Latin word, X which means sour. Whereas the word 'alkali' comes from the Arabic word, Y which means ashes of plants.

What are the correct words for X and Y?

a)

X=acidus Y=alqali

b)

X=adchid Y=aqali

c)

X=acidus Y=aqali

d)

X=achidus Y=alqali

65.

Is vinegar acidic?

a)

Yes

b)

No

66.

Please pick the correct properties of alkali.

a)

pH value more than 7

b)

Not corrosive

c)

Turns blue litmus paper red

d)

Taste bitter

67.

A piece of red litmus paper is placed in a test tube containing calcium hydroxide powder. What will happen next?

a)

Nothing

b)

Red litmus paper turns blue

c)

Red litmus paper will form holes

d)

Calcium hydroxide powder will evaporate

68.

After being tested with sodium hydroxide, what colour will Phenolphthalein turn into?

a)

colourless

b)

pink

c)

yellow

d)

blue

69.

Which are the characteristics of villi on the wall of small intestine?

(answer can be more than one)

a)

Millions of fine projections

b)

To decrease surface area for process of absorption of digested food

c)

To increase surface area for process of absorption of digested food

d)

Wall of villus is one-cell thick

70.

Lacteal is to absorb digested fat in villi of the small intestine and transfer it into the lymphatic system and then to the blood circulatory system.

Is the statement above true?

a)

Yes

b)

NO

71.

Is villus a singular noun?

a)

Yes

b)

NO

72.

Which acid is used to make Vitamin C pills ?

a)

Ascorbic acid

b)

Tartaric acid

c)

Sulphuric acid

d)

Vinegar

73.

What kind of substance is detergent ? (acid / alkali )

(a)  

74.

Reaction between acid and alkali that forms salt and water is called ?

a)

neutralisation

b)

titration

c)

mixture

d)

fluoridation

75.

Hydrochloric acid + Sodium hydroxide = ?

a)

sodium chloride + water

b)

potassium suplhate + water

c)

sodium sulphate + water

d)

sodium nitrate + water

76.

Which organ in our body is represented by Visking tube?

(a)  

77.

What is represented by distilled water?

(a)  

78.

Give one precautionary step that need to taken when carrying out this experiment. (OPEN-ENDED)

4 lines
79.

What is assimilation?

a)

process of distributing the end products of digestion for the use of the cells in our body

b)

process of elimination of faeces from our body

c)

process of breaking down food that is complex and large into small molecules

d)

process of transferring digested fat into lymphatic system and then into blood circulatory system

80.

Pick the right matching of the end products of digestion and body uses. (PICK TWO)

a)

Glucose-produce energy

b)

Amino acid-produce energy

c)

Fatty acid and glycerol combine to form fat which used as heat insulator and to protect internal organs

d)

Glucose- form component of cells

81.

Which of the process is not involve in assimilation of digested food?

a)

Digestive system

b)

Blood circulatory system

c)

Assimilation

d)

Lymphatic system

82.

Which is not the end products of assimilation distributed for?

a)

formation of new cells

b)

breathing

c)

regulation of body temperature

d)

defecation

83.

Undigested food will move into large intestine and become solid waste, called (a)  

84.

What is the example of undigested food or food that is not absorbed by small intestine?

(ANSWERS CAN BE MORE THAN ONE)

a)

fibres

b)

dead cells

c)

water

d)

protein

e)

minerals

85.

Acidic soil can be treated by adding substance X which is alkaline in order for plants to grow well.

What is substance X?

(a)  

86.

What are organ X and Y respectively?

a)

blood vessel ; rectum

b)

rectum ; blood vessel

c)

blood vessel ; duodenum

d)

small intestine ; rectum

87.

Where is the wall of villi ?

a)

At the wall of small intestine

b)

Inside the blood capillary

c)

At the wall of large intestine

d)

Inside lacteal

88.

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

89.

Which of the substance below are emulsion colloids? (choose two)

a)

shaving cream

b)

mayonnaise

c)

green tea

d)

milk

90.

Is protozoa 原生动物 a pathogen ?

a)

Yes

b)

No

91.

Solution A has less amount of solute in the solvent and it can dissolve more solute. What type of solution is solution A?

a)

saturated solution

b)

concentrated solution

c)

dilute solution

d)

suspension solution

92.

Please choose the substances below that can be dissolved by water. (choose two)

a)

fertilisers

b)

nail varnish

c)

detergents

d)

lacquer

93.

X is a cloudy mixture formed from undissolved solute particles in a solvent. What is X?

(a)  

94.

Sunny was doing an experiment. He filled mixture X into a beaker. Then, he tried to flash a torch through the beaker, but the light did not manage to pass through the beaker. What type of mixture may be mixture X?

a)

solution

b)

suspension

c)

colloid

d)

compound

95.

What organic solvent which is used to extract oil?

a)

Ether

b)

Acetone

c)

Turpentine

d)

Kerosene

96.

Jason add bigger solute particles to the mixture, the solubility of it will increase/decrease.

(a)  

97.

How is the cobalt chloride paper (blue when dry) when there is presence of water?

a)

Turns pink

b)

Turns red

c)

Become colourless

d)

Remain blue

98.

What will happen if Zack uses blue litmus paper to test with sodium hydroxide solution?

a)

Blue litmus paper turn red

b)

Blue litmus paper remain blue

c)

Blue litmus paper has been corroded

d)

Blue litmus paper turn purple

99.

Amin is not infected with chicken pox anymore as he has been infected with the disease when he was 7 years old.

What's the type of immunity for this case?

a)

Active natural immunity

b)

Active artificial immunity

c)

Passive natural immunity

d)

Passive artificial immunity

100.

A patient with hacking cough干咳 is injected with the antibody taken from an individual immune to the disease.

What's the type of immunity for this case?

a)

Active natural immunity

b)

Active artificial immunity

c)

Passive natural immunity

d)

Passive artificial immunity

101.

Ali has red rashes on his body and he is intestinal bleeding肠出血. What is the disease infected by Ali probably be?

a)

Typhoid

b)

Zika

c)

Leptospirosis

d)

Malaria

102.

Albert getting headache, fever and his muscles are pain.

What disease infected by Albert probably be?

a)

Leptospirosis

b)

Typhoid

c)

Zika

d)

Malaria

103.

What's the vector bringing Plasmodium malariae?

a)

female Anopheles mosquito

b)

Anopheles mosquito

c)

male Anopheles mosquito

d)

female Aedes mosquito

104.

What is X?

(a)  

105.

What will happen when Hydrochloric acid and Potassium hydroxide mixed together?

a)

Nothing happen

b)

Form potassium chloride and water

c)

Form potassium chloric and water

d)

The mixture exploded

106.

What will happen when universal indicator is tested with vinegar?

a)

Become red

b)

Become blue

c)

Become colourless

d)

Become green

107.

How to add acid from the burette in the process of titration?

a)

drop by drop

b)

add all of the acid in once

c)

directly pour acid into the conical flask

d)

continue adding acid although it already changed colour

108.

Which is the word equation of neutralisation?

a)

Acid+Alkali --> Salt+Water

b)

Acid+Salt --> Alkali+Water

c)

Salt+Alkali --> Acid+Water

d)

Salt+Water -->Acid+Alkali

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