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IMSO 2008 Science International - Theory II

Question 1

When we use a towel to dry something, the most significant phenomenon involved is …?
  1. Adhesion
  2. Evaporation
  3. Absorption
  4. Cohesion
  5. Transpiration

Question 2

Which one of the following statements is true for a rainbow?

A. Colours in the rainbow are spectra of water molecules.

B. A rainbow can happen in space where matter does not exist.

C. Dispersion by water molecules (droplets) in the sky produces a rainbow.

D. A rainbow may contain only one specific colour, for example green or red.

E. Water molecules are scattered by the sky.

Question 3

From the list below, which pair of plant and animal parts is most alike in function?
  1. Flower and hair
  2. Leaf and ear
  3. Phloem and blood vessel
  4. Xylem and liver
  5. Seed and head

Question 4

If a hibiscus plant is pollinated by an orchid, what is most likely to happen?
  1. The offspring will look like an orchid.
  2. The offspring will look like a hibiscus.
  3. No offspring will be produced.
  4. The offspring will die.
  5. The offspring will look like both flowers.

Question 5

If we travel in a plane at the same speed as the rotation of the Earth, in which direction should we fly so that we feel time “stop”?
  1. From north to south
  2. From west to east
  3. From east to west
  4. From south to north
  5. Along the equator

Question 6

In bungee jumping, which component of the equipment absorbs energy?
  1. The helmet has great air resistance, so it produces great friction.
  2. The jacket is very light and produces an Archimedes upward force in air.
  3. The cord behaves like a spring and stores potential energy.
  4. The safety harness must be set so that it slows down the jumper.
  5. The shoes behave like a spring so that the jumper’s feet remain clean.

Question 7

How can an acrobat walk on a narrow tightrope using a balancing pole?
  1. The acrobat can reduce the gravitational force.
  2. The balancing pole can “hold” the air to support the acrobat.
  3. The balancing pole helps the acrobat set the centre of mass on the string.
  4. The balancing pole can levitate the acrobat.
  5. The soles of the acrobat’s shoes are sticky.

Question 8

We smell something because the source of the smell …
  1. Radiates its presence through the air and we catch the signal.
  2. Evaporates some smell in gas form and our nose detects it.
  3. Sends an electromagnetic signal to our brain, which tells our nose to pretend a smell is present.
  4. Creates a kind of noise.
  5. Sends an ultrasonic wave to our nose.

Question 9

Linda wants to investigate whether pumpkin seeds grow better in light or darkness. You could suggest that she put the seeds on pieces of …

A. Dry cotton, keeping one group in a light place and another in a dark place.

B. Damp paper, keeping them in a warm place and a cool place.

C. Moist cotton, keeping them in a light place or a dark place that is warm.

D. Damp paper, keeping one group in a light place and another in a dark place.

E. Plastic, keeping one group in a light place and another in a dark place.

Question 10

In the hydrological cycle, which sequence is correct?
  1. Condensation of water vapour in clouds, then evaporation from the ocean, then precipitation as rain.
  2. Precipitation as rain, then condensation of water vapour in clouds, then evaporation from the ocean.
  3. Evaporation from the ocean, then condensation of water vapour in clouds, then precipitation as rain.
  4. Evaporation from the ocean, then precipitation as rain, then condensation of water vapour in clouds.
  5. Condensation of water vapour in rain, then precipitation in clouds, then evaporation from the ocean.

Question 11

Analyse the diagram. If the population of predator 3 severely decreases because of a disease, which statement is most likely to occur immediately?

Question illustration

Labels: Predator 1–4; omnivore; Herbivore 1–2; Producer 1–2.
  1. Herbivore 2 will increase in number.
  2. Predator 1 will increase in number.
  3. Herbivore 1 will decrease in number.
  4. Producer 2 will decrease in number.
  5. The omnivore will increase in number.

Question 12

Ahmad investigates the respiration rate of 35 grams of bean sprouts using a respirometer with coloured liquid. The table shows his observations.

Question illustration

Figure labels: coloured liquid; RESPIROMETER.

| No. | Observation time (minutes) | Displacement of coloured liquid (ml) | Mean respiration rate (ml/minute) |
|---|---|---|---|
| 0 | 0 | 0 | |
| 1 | 5 | 1.5 | |
| 2 | 10 | 3 | 1.5 ml/5 minutes |
| 3 | 15 | 4.5 | |
| 4 | 20 | 6 | |

A. Predict the displacement of coloured liquid at the 25th minute. (1 point)

a) 6.5

b) 7

c) 7.5

d) 8

e) 8.5

B. Using the data above, draw a line graph of displacement against time. (2 points)

Question 13

Fany wants to show that plants need nutrients in the soil for healthy growth. She uses two pots of plants. One pot is set up as shown. Which ONE of the following should she use for the second pot?

Question illustration

First-pot labels: sunlight; soil, nutrients, water.

Question illustration
  1. Sunlight; soil.
  2. Dark plastic cover; nutrients, water.
  3. Sunlight; soil, water.
  4. Sunlight; soil, nutrients.
  5. Dark cupboard; soil, water.

Question 14

The graph represents the growth of Mycobacterium tuberculosis in different media containing particular antibiotics.

Question illustration

Graph labels: Growth of M. tuberculosis; number of colonies per mm; Weeks; without antibiotics; Penicillin; Rifampicin; TXT.

a) Write down the most potent antibiotic against Mycobacterium tuberculosis to be used in humans. (2 points)

b) For at least how many weeks should rifampicin be used to treat Mycobacterium tuberculosis effectively? (2 points)

Question 15

The diagram shows the arrangement of your teeth. The dentist has circled a tooth with a cavity. Write down its type.

Question illustration

Label: Teeth diagram.

Question 16

Smoking is not acceptable because cigarettes contain toxins. List three risks for a person who smokes.

Question 17

During the first few weeks, a corn seedling uses its cotyledon to supply nutrients for growth before the root can absorb water and nutrients from the ground. Which part of a fertilised chicken egg has a similar function to the cotyledon?

Question 18

The diagram shows the outline of a wave on the water surface.

Question illustration

Labels: vertical movement (cm); horizontal movement (cm).

a) Determine the wavelength. (1 point)

b) Determine the amplitude. (1 point)

Question 19

Look at the distance–time graph. Which section indicates that the object is:

Question illustration

Graph labels: Distance; time; A, B, C, D.

a) Moving with constant speed? (1 point)

b) At rest? (1 point)

Question 20

The melting and boiling points of six substances, A–F, are listed below.

| Substance | Melting point (°C) | Boiling point (°C) |
|---|---|---|
| A | 101 | 232 |
| B | −30 | −5 |
| C | 44 | 130 |
| D | −45 | 89 |
| E | −5 | 15 |
| F | 1 | 40 |

a) Which substance(s) are gases at room temperature, 25 °C? (1 point)

b) Which substance(s) are liquids at room temperature, 25 °C? (1 point)