Science: EXERCISES

EXERCISE 1

CLASSES OF FOOD

1.What usually happens to excess proteins in the body

A.Dissolved in the urine

B Excreted though the sweat

C.Converted into urea by the liver

D.Stored in the muscles of the body

2 .An athete suffering from a muscle cramp due to excessive sweating should drink plenty of water containing.

A.Glucose

B.Vitamin C

C.Sodium chloride

D.dissolved oxygen

3.We should not boil fresh fruits juice because boiling

A.decomposes the mineral salts

B.destroys most of the vitamins

C.breaks up the plant proteins

D.makes the juice more sout

4.The minerals irons is required by the body for

A.preventing night blindness

B.Producing haemoglobin.

C.absorbing vitamins

D.building up bones

5.Which statement about nutrients is false

A.Fats supply more energy per gram than carbohydrates

B.Calcium is required to prevent eyes and skin diseases.

C.Vitamins are required by the body in very small amounts

D.Proteins supply marerials for building new cell.

EXERCISE 2

ACID AND ALKALINE

1. Lee Fong and Fatimah carried out an investigation on the properties of substances M, N and O.

They used blue and red litmus papers to investigate the properties of the substances. The table below shows the observations of the investigation.

Substance	The colour changes of litmus paper
Substance	Red litmus paper	Blue litmus paper
M	No change	No change
N	Change to blue	No change
O	No change	Change to red

(a) State the thing that is kept the same.

___________________________________________

(b) Explain the colour changes of litmus paper on Substance N.

___________________________________________

(i) SubstanceM: __________________________

(ii) Substance O: __________________________

Underline the correct answers.

1. ( Alkaline , Neutral ) substances are slippery to the touch and taste bitter.

2. The pH value of neutral substances is ( 7 , 8 ) whereas acidic substances has the pH of ( 1-6 , 8-14 ).

3. Strong acidic and alkaline substances are ( corrosive , tetanus ) and ( protest , burn ) our skin.

4. ( Salt water , Soap ) does not change the colour of a litmus paper because it is ( neutral , acidic ).

5. Substances that taste bitter are generally ( acidic , alkaline ).

EXERCISE 3

PHASES OF MOON

1. The diagram below shows the phases of the Moon.

Which of the following arrangements shows the phases of Moon?

A P - Q - R - S

B P - R - S - Q

C P - Q - S - R

D P - S - R - Q

2. How many times can you see the crescent moon in amoon?

A 1

B 2

C 3

D 4

3. The phases of the moon consist of

I crescent III half moon

II new moon IV full moon

A I and III only

B II and IV only

C I, II and III only

D I, II, III and IV

4. The lunar calendar is based on ……

A The occurrences of day and night

B The movements of the Earth

C The Earth rotating on its axis

D The phases of the moon

EXERCISE 4

CONSTELLATION

A group of stars that forms a certain pattern in the sky.

1. The statement above refers to :

     A Sun                          C Earth

     B Moon                       D Constellations

2. Constellations are important because they :

      I   Give off light                III   Indicate the time to plant crops

      II Show directions             IV Indicate the time to harvest crops

A I and II only                            C   I, II and III only

      B I , III and IV only                    D II, III and IV only

3. A fisherman who lost his direction wants to travel south. Which of the following

     Constellations does he need to look for ?

      A Southern Cross

      B Orion

      C Big Dipper

      D Scorpion



4.   Which of the following is true about the constellation?

      A Constellation is a group of planets.

      B Constellation is a group of natural satellites.

      C Constellation is a group of asteroids in the solar system.

      D Constellation is a group of stars that form a certain pattern in the sky.

5. What is the importance of constellations?

      I   To show directions

     II   To form four seasons

III To indicate the time to carry out certain activities

A   I only

B   I and III only

C   II and III only

D   I, II and III

EXERCISE 5

WATER

1 Diagram 1 shows the formation of clouds and rains.

Cloud

Water vapour Rain

Water on Earth

Which of the following processes are involved in this phenomenon?

A Boiling and evaporation

B Evaporation and condensation

C Condensation and freezing

D Melting and boiling

2. Which of the following practices can keep our sources of water clean?

A Organize campaign “ Cintailah Sungai”.

B Use of natural fertilizers whenever possible.

C Release of sewage from houses into the sea.

D Don’t flush plastic products down the toilet..

3. Which of the following conditions can increase the rate of the evaporation of water?

I Dry III Hot weather

II Wet IV Cold weather

A I and II only

B I and III only

C II and IV only

D III and IV only

4. A group of pupils boil 100ml of water. After a few minutes, the volume of the water decreases. What can you infer ?

A Some of the water changed into steam.

B Some of the water changed into ice.

C The beaker absorbed the water.

D Water is condensed.

EXERCISE 6

HEAT

1. The hold of a kettle is made of plastic. What can you deduce ?

A. Plastic is an insulator

B. Plastic can be stretched

C. Plastic is hard and strong

D. Plastic is a good conductor

2. Which of the following objects are conductor ?

I . Wire II. Key

III. Eraser IV. Iron spoon

A. I , II and III

B. I , II and IV

C. I , III and IV

D. II , III and IV

3. Mrs. Lee uses 4 pots made from different materials for cooking rice. The table below show the results.

Pot	Enamel	Silver	Aluminum	Steel
Cooking time (minutes)	53	37	41	68

a) State the :

i. Manipulated variable :

ii. Responding variable :

b) Write one inference for the cooking time for silver pot.

c) What hypothesis can be made based on the table ?

d) What conclusion can you make based on the above investigation ?

EXERCISE 7

MICROORGANISM

1. The statement below shows a step in the process of making bread.

1 teaspoon of dried yeast is added to make dough rise

What cause the dough to rise?

A The growth of yeast C The movement of yeast

B The breathing of yeast D The reproduction of yeast

2. The diagram shows the condition of a patient

State the disease shown above.

A Aids C Mumps

B Scabies D Conjunctivitis

3. Which of the following are microorganisms?

I Bacteria II Hibiscus

III Virus IV Fungi

A I and II only

B I , II and III only

C I , III and IV only

D I , II , III and IV

4. Brushing our teeth regularly helps prevent tooth decay because it……

A Makes our teeth look white.

B Makes our teeth stronger.

C Removes food that microorganisms feed on.

D Removes all the microorganisms from your mouth.

5. Which of the following diseases cannot spread from one person to another?

A Asthma

B Conjunctivitis

C Cough

D Flu

Exercise 1b

1. The table shows the growth of microorganisms on a slide of bread.

Days	Number of black spots
0	0
2	1
4	2
6	3
8	4
10	5

a) What is the purpose of this experiment ?

________________________________________________________________

b) What is the trend of change in the number of black spots ?

_______________________________________________________________

c) State one information in this experiment.

_______________________________________________________________

d) State the relationship between the variable that is changed and the variable that is observed.

___________________________________________________________________

e) Predict the number of black spots on the 20^th day.

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EXERCISES