cloned pmr sains

©Sasbadi Sdn. Bhd. i

Info Update on PMR Science 2007

Cloned PMR Question (Paper 1)

Q.1 (Chapter 1)

Identify the natural phenomenon in the given list of events.

Growth of a baby

Q.2 (Chapter 1)

Study the table below.

Number of metal spheres Total volume of the spheres (cm3)

2 8

4 16

What is the total volume of 5 similar spheres?

20 cm3

Q.3 (Chapter 2)

Name the cell which has the above characteristics.

A sperm cell

Q.4 (Chapter 2)

Identify the unicellular microorganisms in the list above.

Chlamydomonas, amoeba and paramecium.

• The cell can move by itself.

• It is the smallest cell in the human body.

Chlamydomonas, amoeba, paramecium and spirogyra

NEXUS VISTA PMR SCIENCE FORM 1,2,3

Page (ix) (Info Update)

Supplementary Materials for

©Sasbadi Sdn. Bhd. ii

Q.5 (Chapter 3)

Substance Density (g cm-3

)

Ice 0.9

Iron 7.8

Oil 0.8

Mercury 13.6

Which of the substances stated in the table above will float on water? (The density of water is

1.0 g cm-3

)

Ice and oil

Q.6 (Chapter 3)

The diagram shows a substance changing its state when it releases heat.

Choose the statement which correctly describes the particles during the change of state.

The kinetic energy of the particles gradually decreases

Q.7 (Chapter 4)

W, X and Y are steps used to separate a mixture of sand and salt.

State what is done in steps W, X and Y.

W: The mixture is stirred and dissolved in water

X: The solution is filtered

Y: The filtered salt solution (filtrate) is evaporated

W X Y Salt is obtained

heat is released




©Sasbadi Sdn. Bhd. iii

Q.8 (Chapter 5)

A candle is burning. What products are formed?

Carbon dioxide and water vapour

Q.9 (Chapter 6)

The spring of a toy car is wound and then the car is allowed to run on the floor. What energy

change takes place?

Potential energy kinetic energy

Q.10 (Chapter 7)

Why are houses in tropical countries usually painted white?

To reflect heat from the house

Q.11 (Chapter 7)

Choose the correct sequence of steps to show how the automatic fire alarm works.

(a) When there is a fire, the temperature in the room rises.

(b) The bimetallic strip gets heated, expands and bends downwards.

(c) The bimetallic strip touches the contact point and completes the electric circuit.

(d) The automatic fire alarm rings.

Q.12 (Chapter 7)

bimetallic strip brass

iron

electric bell

heat

P

Q

R

wax

thumbtack

contact point




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The three metal rods P, Q and R are evenly heated. The table below shows the time taken for the

thumbtacks to fall.

Thumbtack at P Thumbtack at Q Thumbtack at R

Time (s) 140 180 100

Arrange the metal rods in ascending order of conductivity of heat.

Q → P → R

Q.13 (Chapter 8)

From the list given above, name the sensory organ which can detect touch, pressure and pain.

Skin

Q.14 (Chapter 9)

The calorific value of rice is 15 kJ/g.

What is the calorific value in 100 g of rice?

Calorific value = (15 × 100) kJ

= 1 500 kJ

Q.15 (Chapter 10)

Choose the list which consists of cold-blooded animals only.

Goldfish, snake, frog

Q.16 (Chapter 14)

Student Mass (kg) Height of stairs (m)

W 40 3.0

X 50 4.2

Y 70 4.0

Z 60 2.5

Four students of different masses climbed stairs of different heights as shown in the table above.

Arrange the students in ascending order, starting with the one who did the least work.

W, Z, X, Y

Eye, nose, ear and skin




©Sasbadi Sdn. Bhd. v

Q. 17 (Chapter 11)

The above shows a pyramid of numbers in a habitat. Draw the pyramid of numbers you expect if

suddenly all the snakes in the habitat died.

Q.18 (Chapter 11)

The organisms named above are found in a habitat. Draw a food web for them.

Snakes

Frogs

Caterpillars

Leaves

More frogs

Fewer caterpillars

More leaves

• Caterpillars

• Rats

• Paddy

• Eagles

• Cobras

• Sparrows

Paddy

Rats Cobras

Eagles

Caterpillars Sparrows




©Sasbadi Sdn. Bhd. vi

Q.19 (Chapter 11)

The diagram shows part of a carbon cycle. Which of the processes W, X, Y and Z are involved in

the production and absorption of carbon dioxide?

Production of carbon dioxide: W(respiration), X (respiration), Z (decay)

Absorption of carbon dioxide: Y(photosynthesis)

Q.20 (Chapter 12)

Process X Process Y

The diagrams show two processes used for purifying water. What is the actual reason for using

each of the two processes?

Process X is used to separate the insoluble solids from the water.

Process Y is used to kill microorganisms in the water

Carbon dioxide in the atmosphere

Animals Plants

Death and decay

W

X

Y

Z

glass rod

filter

funnel

muddy

water

filtrate




©Sasbadi Sdn. Bhd. vii

Q.21 (Chapter 12)

Beginning After 3 days

Explain why the water level in the beaker has gone down after 3 days.

The water molecules absorb heat, gain kinetic energy and some turn into gas and escape into the

air.

Q.22 (Chapter 13)

Why does water from the beaker enter the syringe when the piston is pulled up?

The atmospheric pressure acting on the water in the beaker is higher than the air pressure in the

syringe.

60 ml

40 ml

water

syringe

handle

piston

water




©Sasbadi Sdn. Bhd. viii

Q.23 (Chapter 13)

In the experiment shown above, the water remains in the glass and the plastic cover does not fall.

Air pressure in which direction helps the experiment to be carried out?

Air pressure at C acting upwards on the plastic cover

Q.24 (Chapter 15)

What is supporting the body of the insect?

The exoskeleton (hard outer covering on the body)

Q.25 (Chapter 16)

P Q R S

Arrange the four models in ascending order of stability.

R, P, S, Q

glass

water

thin plastic

cover

A

B

C

D




©Sasbadi Sdn. Bhd. ix

Q.26 (Chapter 17)

A worker is holding a spade as shown in the diagram. How should the worker hold the spade so

that he uses the minimum force to lift the sand.

Use the left hand to hold the spade at S, while keeping the right hand in the same position

Q.27 (Chapter 17)

Method P Method Q

The diagrams show two methods of pulling out a nail from a wall. Which of the statement given

about them is correct?

Method Q requires less effort than method P to pull out the nail from the wall.

Q.28 (Chapter 18)

You are given four statements about the transport of oxygen in the human body. You are to

rearrange the statements in the correct sequence.

(a) Oxygen diffuses through the walls of the alveoli into the blood capillaries covering the

alveoli

(b) The oxygen combines with haemoglobin in the red blood cells and forms

oxyhaemoglobin.

(c) The oxyhaemoglobin is transported in the blood to all parts of the body.

(d) The oxyhaemoglobin releases its oxygen and forms haemoglobin again.

P Q R S

• • • •

nail

wall

P

wall

nail Q

right hand left hand




©Sasbadi Sdn. Bhd. x

Q.29 (Chapter 19)

You are asked to choose the correct statement about the blood circulatory system shown in the

diagram above.

Oxygenated blood flows from the lungs to the heart and then to all parts of the body.

Q.30 (Chapter 20)

What is the function of organ X shown in the system above?

Organ X filters the blood passing through it to remove waste products

Q.31 (Chapter 20)

The machine shown above is used by patients whose kidneys do not function. What function

does the machine carry out?

The machine filters mineral salts and urea from the blood passing through it.

lungs

heart

body

X

dialysing fluid in

dialysing fluid out

partially permeable membrane

blood in

blood out

flow meter

blood clot and bubble trap




©Sasbadi Sdn. Bhd. xi

Q.32 (Chapter 21)

Which of the following are birth control methods used by a man and a woman?

Man Woman

Cut and tie the sperm ducts

Use spermicide cream

Q.33 (Chapter 22)

The graph shows the growth of a normal human being. Which two stages show very rapid

growth?

Stages P and R

Q.34 (Chapter 23)

An aeroplane, a ship and a bus use fuels obtained from petroleum. Name the actual petroleum

fuels used by them.

Aeroplane: Kerosene

Ship: Fuel oil

Bus: Diesel

Q.35 (Chapter 24)

W, X, Y and Z are components correctly

used in the electric circuit shown. Identify

the components using their usual symbols.

W Y

X Z

4 12 8 16 20 24 28 Age (year)

Height (cm)

P Q

S R

W

X

Y

Z




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Q.36 (Chapter 24)

One of the bulbs is fused, causing the other three bulbs to be not lighted. Which is the fused

bulb?

Bulb C

Q.37 (Chapter 24)

A positively charged ruler attracts a balloon which has been rubbed with a piece of cotton cloth.

What causes the balloon to be attracted to the ruler?

The balloon has received negative charges or electrons.

Q.38 (Chapter 25)

An electrical energy transmission and distribution system steps down the voltage produced to

different levels such as to 240 V, 415 V, 11 kV and 33 kV.

What is the reason for doing this?

This is done because different residential areas and different industries require different voltages

to work their electrical appliances.

Q.39 (Chapter 26)

You are to choose the statement which explains what occurs in the core of the Sun.

Hydrogen atoms fuse to form helium atoms.

Q.40 (Chapter 27)

How did Claudius Ptolemy’s idea of the Solar System differ from our idea today?

Claudius Ptolemy assumed that the Earth was the centre of the Solar System.

B

A

C

D




©Sasbadi Sdn. Bhd. xiii

PAPER 2 (Structured Questions)

Section A (Theory)

Q.1 (Chapter 2)

(a) i. The diagram shows how some cells are organised.

Tick ( � ) the diagram which shows an organ.

ii.

Choose two organs from the list given above.

Nose and lungs

(b) State the function of each cell.

Cell Function

It is involved in reproduction

It sends nervous impulses from one part of

the body to another.

It carries oxygen to all the cells in the

body.

It destroys bacteria.

ovum muscle nose lungs

�




©Sasbadi Sdn. Bhd. xiv

Q.2 (Chapter 16)

The diagram below shows two tables placed on a wooden plank.

P Q

(a) State two factors which affect the stability of the tables.

1. The base area of the table

2. The centre of gravity of the table

(b) The wooden plank is tilted slowly. Which table will topple first? Why?

Table Q will topple first, because it has a higher centre of gravity.

(c) The diagram shows a giraffe and a crocodile.

Giraffe Crocodile

i. How does a giraffe maintain its stability when it is drinking water from a river?

The giraffe splays out its legs to get a bigger base area.

ii. Suggest why a crocodile is more stable than a giraffe.

A crocodile has a much lower centre of gravity.

wooden

plank




©Sasbadi Sdn. Bhd. xv

Q.3 (Chapter 23)

The diagram below shows the apparatus set up to investigate the effect of heat on calcium

carbonate.

(a) i. Name the liquid P in the test tube.

Limewater

ii. State one observation that you can make on liquid P during the experiment.

Liquid P (limewater) turns milky.

(b) Write a word equation to show what happens when calcium carbonate is heated.

Calcium carbonate heat

calcium oxide + carbon dioxide

(c) What conclusion can you draw from the result of this experiment?

Calcium carbonate can be decomposed by heat, releasing carbon dioxide.

(d) State how you would prepare slaked lime from pieces of sea shells.

(a) Grind the sea shells into powder and heat the powder strongly in a boiling tube

until all the carbon dioxide is released.

(b) Allow the residue to cool and then slowly add water to it until there is no more

reaction. Slaked lime is formed.

(c) Heat the slaked lime to drive away excess water.

calcium

carbonate

P




©Sasbadi Sdn. Bhd. xvi

Q. 4 (Chapter 24)

The circuit below is used to study the relationship between voltage, resistance and current.

(a) Name the component R.

Ammeter

(b) What are the functions of the components P and Q?

P is used for measuring the voltage across the battery.

Q is used for controlling the resistance and hence the current in the circuit.

(c) Suggest one way to reduce the reading of R in the circuit.

Use Q (rheostat) to increase the resistance in the circuit

(d) The two identical bulbs in the circuit below are arranged in parallel. Each bulb has a

resistance of 2 ohms and the ammeter has a reading of 6A. Calculate the voltage in the

circuit.

1 = (1 + 1 ) ohm

R 2 2

R = 1.0 ohm

V = I × R

V = (6 × 1) V

= 6 V

P

R Q

A

L1

L2




©Sasbadi Sdn. Bhd. xvii

Q. 5 (Chapter 17)

A pair of pliers

(a) i. To which class of levers does the pair of pliers belong?

First class

ii. Give a reason for your answer to (a)i. above.

The fulcrum is placed between the load and the effort

(b) Why is it easier to cut the wire if the pair of pliers is held at X rather than at Y?

The effort arm becomes longer and so less effort is needed.

(c) The diagram below shows a worker using a wheelbarrow.

Draw the lever system in the wheelbarrow. Label the fulcrum, the load and the effort.

effort fulcrum

load

Y X

wire




©Sasbadi Sdn. Bhd. xviii

(d)

The metre rule is kept in balance by the effort and the load. Calculate the load W.

Load × load arm = Effort × effort arm

W × 100 cm = 50 N × 20 cm

W = 50 N × 20 cm

100

= 10 N

(e) The diagram shows two persons rowing two similar boats.

Explain why X uses less force than Y to row the boat.

X applies a force on the oar at a point further away from the fulcrum of the oar. This

gives a longer effort arm and so less force is required to move the oar.

Q.6 (Chapter 8)

The diagram below shows how the human eye sees an object.

force 50 N

20 cm metre rule

load W

80 cm

X Y

object Q image I




©Sasbadi Sdn. Bhd. xix

(a) i. State one characteristic difference between object Q and image I.

Object Q is erect, while image I is inverted.

Object Q is larger than image I.

ii. The object is moved closer to the eye. How does the size of the image change?

The image in the eye becomes larger.

iii. State one reason for your answer in (a)ii. above.

The visual angle for the eye is increased.

(b) i. Complete the diagram below to show how a short-sighted eye forms an image of

the distant object on the retina.

A short-sighted eye

ii. State the causes of short-sightedness.

It may be due to the eye lens being too thick or the eye ball being too long.

iii. How can short-sightedness be corrected?

Short-sightedness can be corrected by using a concave lens to diverge the light

rays entering the eye.

Section B(Practical)

Q.7 (Chapter 21)

(a) State which part of the plant is used for vegetative reproduction in the following plants.

i. Ginger : Rhizome (underground stem)

ii. Bryophyllum : Leaf

iii. English potato : Tuber (underground stem)

iv. Banana tree : Sucker (shoot from underground stem)

light from a distant

object

image on

retina is blur




©Sasbadi Sdn. Bhd. xx

(b) Classify the plants listed below into two groups. State the characteristics used for your

classification.

Q. 8 (Chapter 12) The diagram below shows the apparatus set up for an experiment. The enlarged graduation

shows the initial temperature of the distilled water.

Ginger Bryophyllum English potato Banana tree

Plants Plants

Ginger

English potato

Bryophyllum

Banana tree

Characteristic Characteristic

These plants have

underground food

storage stems

These plants do not

have underground

food storage stems

29

28

distilled water




©Sasbadi Sdn. Bhd. xxi

(a) What is the initial temperature of the distilled water?

28.5 °C

(b) The table below shows the results of the experiment.

Time(min) 2 4 6 8 10

Temperature(°C) 50 70 90 100 100

State the variables involved in the experiment.

i. Manipulated variable: Quantity of heat supplied

ii. Constant variable: Type and volume of water used

iii. Responding variable: Rise in temperature of the distilled water

(c) Suggest a hypothesis based on the results of the experiment.

At normal atmospheric pressure, distilled water boils at 100 °C.

(d) Based on the results of the experiment, draw a graph of temperature against time.

10

20

30

40

50

60

70

80

90

100

0 2 4 6 8 10 12 Time (min)

Temperature (°C)




©Sasbadi Sdn. Bhd. xxii

(e) Based on the graph you have drawn:

i. predict the temperature of the distilled water at the 12th

minute of heating.

100 °C

ii. State the relationship between the temperature of the distilled water and time.

The temperature of the distilled water rises with the length of time of heating until

the temperature reaches the boiling point of the distilled water where the

temperature remains constant.

(f) The experiment is repeated using a salt solution instead of distilled water.

The table below gives the results of this second experiment.

Time(min) 0 2 4 6 8 10 12

Temperature(°C) 30 42 60 80 101 104 104

Based on the results of the two experiments:

i. What inference can you draw about the boiling point of the salt solution?

The salt solution has a higher boiling point than distilled water.

ii. State what you can deduce about the meaning of impure water.

Impure water is water which has a boiling point higher than 100 °C.




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