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ASMO Science Olympiad 2017 — Level 3 (Years 7, 8 & 9)

Question 1

Paul wanted to investigate the movement of the Sun over over the course of a day. He used a sundial to measure the length of a shadow once every hour from sunrise to sunset.

Which of the following variables must be kept the same in order to obtain reliable data from this activity?

Question illustration
  1. Type of sundial and location of sundial
  2. Length of shadow and location of sundial
  3. Type of sundial and the times at which measurements are taken
  4. Length of shadow and the times at which measurements are taken

Question 2

A student is asked to measure 12 mL of a liquid as precisely as possible. Which piece of equipment should she select for this task?

Question illustration
  1. 25 mL beaker
  2. 25 mL graduated cylinder
  3. 25 mL conical flask
  4. 25 mL volumetric flask

Question 3

What value should be reported for the buret reading shown?

Question illustration
  1. 22.3 mL
  2. 22.30 mL
  3. 22.35 mL
  4. 22.40 mL

Question 4

The initial activity of a radioactive isotope is 120 Bq and the half-life is 20 minutes. For a sample of the same isotope with twice the mass, the values would be:

Question illustration
  1. 120 Bq; 20 minutes
  2. 240 Bq; 20 minutes
  3. 60 Bq; 20 minutes
  4. 120 Bq; 40 minutes

Question 5

Which separation technique is based on differences in the volatility of the substances to be separated?

Question illustration
  1. Filtration
  2. Distillation
  3. solvent extraction
  4. paper chromatography

Question 6

Which of the following diagrams represents the phase of the Moon seen from Earth when the Moon is directly between Earth and the Sun?

Question illustration
  1. Diagram A: right half lit
  2. Diagram B: fully lit
  3. Diagram C: left half lit
  4. Diagram D: dark disk

Question 7

Functions of Tree Parts
1 Produce oxygen
2 Provide support
3 Transport food and water
4 Take in carbon dioxide

Which of the following pairs of functions is performed by a tree trunk?

Question illustration
  1. 1 and 3
  2. 1 and 4
  3. 2 and 3
  4. 2 and 4

Question 8

What are the features of insect-pollinated flowers?

I. Colourful petals
II. Long filaments
III. Small stigmas
IV. Spiky pollen gains

Question illustration
  1. I
  2. I, II
  3. I, II, III
  4. I, III, IV

Question 9

A nail with a 0.25mm² surface area at the bottom. It hit with a 150N of force. What is the pressure apply on the wood?

Question illustration
  1. 600 N/mm²
  2. 37.5 N/mm²
  3. 60000 N/mm²
  4. 200 N/mm²

Question 10

An anti-static dryer sheet in the clothes dryer works because it

Question illustration
  1. adds electric charge to the clothing.
  2. lowers the temperature in the dryer.
  3. reduces friction between the clothes.
  4. shortens the drying time.

Question 11

A fixed mass of a gas at constant pressure has a volume of V at 27°C. The gas will expand to a volume of 2V if the temperature is increased to

Question illustration
  1. 54°C
  2. 127°C
  3. 254°C
  4. 327°C
  5. 600°C

Question 12

Cold pack is used to cover the forehead of kids when they have fever. What is the chemical used in cold pack?

Question illustration
  1. Ammonium nitrate
  2. Sodium hydroxide
  3. Calcium chloride
  4. Copper (II) sulphate

Question 13

The diagram shows 4 ball floating on water.

Which statement about the comparison of density of each ball is correct?

Question illustration
  1. P>Q>R>S
  2. P>R>Q>S
  3. S>Q>R>P
  4. Q>R>P>S

Question 14

What is the advantage of using detergent as a cleansing agent compared with soap?

Question illustration
  1. Detergent produces more foam compared with soap
  2. Detergent dissolves in water to form acidic solution
  3. Detergent is more effective in soft water compared with soap
  4. Detergent is more effective in hard water compared with soap
  5. None of the above

Question 15

In Porro prism binoculars, Porro prisms are most often used in pairs forming a double Porro prism. A second prism is rotated 90 with respect to the first prism, such that the beam will traverse both prisms.What could be the possible reason behind using the double Porro prism in binoculars?

Question illustration
  1. Double prism alters the direction of the inverted image
  2. Since the image is reflected twice, the image gets inverted.
  3. Two reflections provide a clear image of the object.
  4. The net effect of the prism system is the image rotated by 360

Question 16

“A rainbow is an optical and meteorological phenomenon that is caused by reflection, refraction and dispersion of light in water droplets resulting in a spectrum of light appearing in the sky”

Arrange the colour of rainbow from longer wavelength to shorter wavelength

Question illustration
  1. Red, Orange,Yellow,Green,Blue,Indigo,Violet
  2. Violet,Indigo,Blue,Green,Yellow,Orange,Red
  3. Red,yellow,Orange,Green,Indigo,Blue,Violet
  4. Violet,Blue,Indigo,Green,Orange,yellow,Red

Question 17

About 99% of colourblind people are suffering from red-green color deficiency. What kind of glasses should be designed for such a person?

Question illustration
  1. One glass tinted for red colour deficiency.
  2. One glass tinted for green colour deficiency.
  3. One glass tinted with red colour and other glass tinted with green colour.
  4. Both glasses tinted with same colour to enhance the color perception.

Question 18

The water cycle consists of evaporation of water from water bodies, its condensation and then rain. Also we know that all seawater is salty, so which one of the following statements is INCORRECT?

Question illustration
  1. The evaporation of seawater causes the most of the cloud formation.
  2. The general color of clouds is white because they contain the salt which evaporates with the seawater.
  3. The water from rain percolates through the soil and accumulates as ground water
  4. The heat provided by the sun gives the sufficient kinetic energy to the molecules of the seawater to escape from the surface.

Question 19

“Fresh water has a density of 1.0 while salt water has a density of 1.025. Thus salt water is slightly heavier than fresh water. This difference in density causes the pressure under a saltwater column to be greater than the pressure under a column of the same height of fresh water.”

Suppose we dig a well at the top of the fresh water aquifer and pump the water out of it. What is the correct possibility out of given options?

Question illustration
  1. Pumping out the fresh water would cause the reduction in pressure. To equalize this pressure salt water would be drawn to the top replacing the fresh water.
  2. The reduction in pressure due to pumping of fresh water would be compensated by the other nearby fresh water aquifers.
  3. The reduction in pressure would intensify the effect of drawing salt water. First we would draw all the fresh water and then after sometime we would get salt water from the well.
  4. To equalise the pressure below ground level, air would be drawn in causing the formation of cracks in the grounds.

Question 20

Sometimes, we see a double rainbow in the sky. Which of the following facts is INCORRECT about the phenomenon of double rainbow?

Question illustration
  1. It is caused by a double reflection of sunlight inside the raindrops.
  2. It is formed when raindrops collect in two groups and each group forms a single rainbow.
  3. Due to second reflection, the colors of second rainbow are inverted as compared to first rainbow formed.
  4. The second rainbow is fainter than the first one because more light escapes from two reflections as compared to one.