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IMSO 2008 Science International - Theory I

Question 1

Mark one correct statement from the list below.
  1. Sharks are mammals because they give birth.
  2. Killer whales, like other mammals, are herbivorous.
  3. Lizards, like other reptiles, are poikilothermic.
  4. Cockroaches are arachnids because they have four pairs of legs.
  5. Donkeys are carnivorous mammals.

Question 2

Icebergs float on seawater. Which statement correctly explains this phenomenon?
  1. The mass of the iceberg is smaller than the mass of seawater.
  2. The mass of the iceberg is larger than the mass of seawater.
  3. The density of the iceberg is smaller than the density of seawater.
  4. The density of the iceberg is larger than the density of seawater.
  5. The iceberg is very big, so it cannot sink.

Question 3

The pictures show different stages in a frog’s growth. Which order is correct?

Question illustration
  1. 1, 2, 4, 3
  2. 2, 1, 3, 4
  3. 1, 2, 3, 4
  4. 2, 1, 4, 3
  5. 1, 3, 4, 2

Question 4

Which part of the Earth listed below has the highest temperature?
  1. Inner core
  2. Crust
  3. Atmosphere
  4. Outer core
  5. Mantle

Question 5

When grass appears green in daylight, which colour of sunlight is reflected by the grass?
  1. All colours except green
  2. Green
  3. The same colour as sunlight
  4. A colour independent of the colour of the light source
  5. All colours including green

Question 6

Which one of the following processes does not have a friction force?
  1. A skier sliding down a hill
  2. A space shuttle approaching the Earth
  3. A person swimming
  4. A man climbing a mountain
  5. A space shuttle approaching the Moon

Question 7

Small fish enter a large fish’s mouth to eat parasites. Which relationship below is similar?

Question illustration

Figure label: Small fish.
  1. A mouse eats cheese on a table.
  2. A bird eats insects on a cow’s skin.
  3. An orchid grows on a palm tree.
  4. A mosquito sucks human blood.
  5. An orchid fertilizes a hibiscus.

Question 8

The following food web is used for Questions 8 and 9. The owl is classified as what type of consumer?

Question illustration

Labels: owl; grasshopper; plants, algae, cyanobacteria; waste and dead organisms; detritivores (bacteria, fungi, certain animals).
  1. Primary consumer only
  2. Secondary consumer only
  3. Tertiary consumer only
  4. Can be a secondary and a tertiary consumer
  5. Can be a primary, secondary and tertiary consumer

Question 9

The following food web is used for Questions 8 and 9. The grasshopper is classified as what type of consumer?

Question illustration

Labels: owl; grasshopper; plants, algae, cyanobacteria; waste and dead organisms; detritivores (bacteria, fungi, certain animals).
  1. Primary consumer only
  2. Secondary consumer only
  3. Tertiary consumer only
  4. Can be a secondary and a tertiary consumer
  5. Can be a primary, secondary and tertiary consumer

Question 10

The animal below is endangered (rare). Which graph correctly describes its population change over time?

Question illustration

Question illustration

The horizontal axes show time; the vertical axes show population. Choices A–E are shown in the figure.

Question 11

Which groups below cannot move, or move very slowly, when the temperature is much lower than room temperature? More than one choice may apply.

A. Cat and dog

B. Turtle and snake

C. Lizard and frog

D. Snake and fly

E. Dog and frog

Question 12

Which bold materials or objects (underlined in the original) lose thermal energy in the situations below? Select all correct choices.
  1. A switched-on **electrical iron**
  2. A **drinking glass** filled with hot water
  3. A **hand** touching ice
  4. A **drinking glass** filled with cold water
  5. Melting **ice**

Question 13

Tropical regions are known for high biodiversity. Which statements below are incorrect? More than one choice may apply.

A. There are many plant and animal species, and each species has high abundance.

B. Each plant and animal species has high abundance, but species variety is low.

C. There are many variations within each plant and animal species.

D. The region contains many types of ecosystems.

E. There are many plant and animal species, but each species has low abundance.

Question 14

Match each letter in column I with a process number in column II.

Question illustration

| Column I: letter | Column II: process |
|---|---|
| A: … | 1. Condensation |
| B: … | 2. Evaporation |
| C: … | 3. Runoff |
| D: … | 4. Precipitation |
| E: … | 5. Evapotranspiration |
| | 6. Transpiration |

Question 15

Match the phenomena in the left column to processes in the right column.

| Left: phenomenon | Right: process |
|---|---|
| 1. Blue sky | a. Interference |
| 2. Rainbow | b. Reflection |
| 3. Colour in a soap bubble | c. Scattering |
| 4. Light travelling in an optical fibre | d. Refraction |

Question 16

Fill each blank in the left column using a numbered answer from the right column.

| Left | Right |
|---|---|
| a. An example of a clinical application of gravitation: … | 1. Diffusion |
| b. An example of a clinical application of circular motion: … | 2. Transport across living membranes |
| c. The main cause of blood circulation in our body: … | 3. Administration of intravenous fluids or transfusions |
| | 4. Pressure |
| | 5. Centrifuge |

Question 18

Three ring magnets are placed on a wooden rod as shown. Determine the magnetic poles at X, Y and Z.

Question illustration

Labels: wooden rod; ring magnet.

Question 19

The Moon’s surface looks smooth to the naked eye but rough through a telescope. Explain why the observations differ.

Question 20

Explain how the handle of a pan becomes warm on a stove even though only the base touches the burner.