Question bank IMSO Science 2021

IMSO 2021 · Experiments · Indonesia · 22 January 2021

Science Experiment Test

30 marks | 120 minutes (one session for Experiments 1 and 2).

Printed name: ____________________ ID: ____________________.

EXPERIMENT 1

EGG TWIST

Objective: You are tasked to explain the concept behind determining if an egg is raw or cooked without breaking the shell.

Materials: Two plates, one hard-boiled egg (shelled), one raw egg, marker pen

Procedure:

(1) Mark each egg so that you know which is cooked and which is raw.

(2) Put the eggs on the two separate plates and start spinning them at the same time. Describe what happened.

(3) Put the raw egg on a plate and spin it. Touch it with your finger to stop it from spinning. Quickly remove your finger from the egg.

(4) Put the hard-boiled egg on a plate and make it spin. Stop it with your finger. Take your finger away quickly.

(5) Record your observation and explanation in Table 1 and answer the questions provided.

Table 1. ____________________________________________________

| | Observation | Explanation |
| --- | --- | --- |
| Procedure 2 (both egg) | ________________ | ________________ |
| Procedure 3 (raw egg) | ________________ | ________________ |
| Procedure 4 (hard-boiled egg) | ________________ | ________________ |

SCIENCE PAPER EXPERIMENT ANSWER SHEET — Page 1 of 3

EXPERIMENT 1 — EGG TWIST

Hypothesis: _________________________________________________ [ __/1]

Table 1. ____________________________________________________ [ __/1]

| | Observation | Explanation |
| --- | --- | --- |
| Procedure 2 (both egg) | ________________ [ __/1] | ________________ [ __/2] |
| Procedure 3 (raw egg) | ________________ [ __/1] | ________________ [ __/2] |
| Procedure 4 (hard-boiled egg) | ________________ [ __/1] | ________________ [ __/2] |

Without using any additional materials, suggest an alternative way of determining if an egg is cooked or raw without cracking it. [ __/2]

________________________________________________________________

Conclusion [ __/2]

________________________________________________________________

Editorial source note: The printed word “shelled” normally means that the shell has been removed; this conflicts with the objective “without breaking the shell.” The original wording is retained. For the non-destructive comparison described here, use a cooled, hard-boiled egg with its shell intact, and record that clarification. The answer-sheet prompts above are part of the task, even where they are absent from the question page.



Editorial illustration: the two test objects and separate plates; no results are shown. Not to scale.

IMSO 2021 · Experiments · Indonesia · 22 January 2021

Science Experiment Test

30 marks | 120 minutes (one session for Experiments 1 and 2).

Printed name: ____________________ ID: ____________________.

EXPERIMENT 2

DENSITY OF THE EGG

Objective: Determine if an egg is raw or cooked by comparing their density (without breaking the shell).

Procedure: You are required to plan and carry out an experiment to attain the objective by observing and explaining what happened in the experiment. You are NOT REQUIRED to use all the materials listed.

You are to provide the following information in your answer sheet:

- Hypothesis
- Materials
- Procedures
- Observation. Draw, discuss, and label your observations.

Guide Questions:

- How does your chosen materials contribute to comparing the density of the eggs?
- Will your observations be the same when you use other materials?

- Conclusion. Write what happened and what the results might mean.
- Modifications. List down materials that you are going modify in your next experiment to get better results.

SCIENCE PAPER EXPERIMENT ANSWER SHEET — Page 2 of 3

EXPERIMENT 2 — DENSITY OF EGG

Hypothesis: _________________________________________________ [ __/1]

Materials: __________________________________________________ [ __/2]

Procedures: _________________________________________________ [ __/3]

Observation(s): Draw and label in the blank space below. [ __/3]



Discussion: __________________________________________________

Conclusion: __________________________________________________ [ __/3]

Modifications: ________________________________________________ [ __/3]

Answer-sheet page 3 of 3 is blank apart from its heading and footer and provides additional working space.

Editorial source note: Although the source refers to “all the materials listed,” no Experiment 2 materials list appears anywhere in the supplied six-page PDF. The proposed materials in the solution are editorial possibilities, subject to availability; they must not be mistaken for the missing official list. Density by itself need not uniquely identify whether an egg is cooked. Report evidence and uncertainty rather than assuming a universal raw/cooked density ordering.



Editorial illustration: two unidentified intact eggs A and B to be compared. Their drawn sizes and positions are schematic, not measurements or predicted observations.

IMSO 2021 · Science Theory Test 1 · Indonesia · 21 January 2021

Theory 1 — 22 questions | 25 points | 60 minutes

Printed name: ____________________ ID: ____________________.

Instructions (printed on the answer sheet):

(1) Do NOT start answering this paper until you are told to do so.

(2) Be sure that your name and ID are written on spaces provided.

(3) Write only your answers in this ANSWER SHEET.

(4) Write only the letter of the correct answer in UPPERCASE/CAPITAL LETTER.

(5) Use BLACK ink to write on the Answer Sheet.

(6) Diagrams are not drawn to scale. They are intended as aids only.

(7) There are 20 multiple-choice questions and 2 short answer questions printed in 10 pages. There is only one correct answer for each question.

(8) Submit a clear scanned copy of this paper to your team leader within 30 minutes after the end of the session.

Editorial clarification: The letter-only instruction applies to Questions 1–20; Questions 21–22 require short text answers. The historical submission instruction is reproduced for completeness and does not request a submission through this package. Items with a source-key conflict or substantive ambiguity are presented for manual grading.

(1) A boy wanted to find the optimum conditions for his chickens to lay eggs. He divided his 20 chickens into 2 groups, X and Y, and recorded their daily care and egg production for 2 weeks.

| Group | Number of chickens | Daily care: chicken feed for group | Daily care: calcium for group | Results after 2 weeks: number of eggs laid by group |
| --- | --- | --- | --- | --- |
| Group X | 10 | 1,000 grams | 5 grams | 82 |
| Group Y | 10 | 1,300 grams | 10 grams | 104 |

The boy DID NOT do a good job designing this investigation. He should have _____. [1.5 marks]

(2) Refer to the following bar graph which shows 4 populations, A-D, involved in the same food chain. [1 mark]

Which population is most likely to have the largest amount of energy available to it?

(3) A student conducted an experiment using four (4) different set-ups: P, Q, R and S. All set-ups contain water in containers made of the same materials. The table below shows the different conditions when she started each experiment.

| Conditions | P | Q | R | S |
| --- | --- | --- | --- | --- |
| Room temperature (°C) | 22 | 24 | 22 | 22 |
| Exposed surface area of water (cm²) | 100 | 100 | 50 | 100 |
| Volume of water (ml) | 150 | 150 | 150 | 150 |
| Temperature of water (°C) | 50 | 50 | 50 | 40 |

Which of the following set-ups are the best for the student to use to ensure a fair test to investigate how the rate of evaporation of water was affected by: [1.5 marks]

| Option | Room temperature | Exposed surface area of water | Temperature of water |
| --- | --- | --- | --- |
| A | P and Q | P and R | P and S |
| B | Q and R | R and S | P and Q |
| C | Q and S | P and S | Q and R |
| D | R and S | Q and R | P and R |

(4) A child is suffering from a disease caused by a certain nutrient deficiency. The child narrated that he shows the following symptoms: inability to gain weight, edema or swelling of the hand and feet, and stomach bulging. The doctor diagnosed the child of kwashiorkor.

Which groups of nutrient rich foods (P-S) and their corresponding sources will the doctor recommend the child to consume more in order to recover from the said nutrient deficiency? [1 mark]

| Group | Foods |
| --- | --- |
| P | Meat, Fish, Egg |
| Q | Butter, Lard, Margarine |
| R | Bread, Biscuit, Potato |
| S | Lemon, Tomato, Orange |

(5) Chromobacterium violaceum is a species of bacteria that is used in different biological tests. C. violaceum is able to sense the presence of other cells by releasing and detecting some signaling molecules. When C. violaceum multiplies and reaches a certain population called the quorum population, it begins to release a purple-colored compound called violacein. This mechanism is called quorum-sensing.

A scientist is investigating whether a seaweed extract inhibits the quorum sensing of C. violaceum. She grows C. violaceum together with the seaweed extract in a liquid broth for 24 hours, and then measured the concentration of violacein and the number of cells. In the experiment, methanol is used as negative control, while cinnamaldehyde is used as a positive control. Below is the result that she obtained.

| | Methanol | Cinnamaldehyde | Seaweed extract |
| --- | --- | --- | --- |
| Concentration of violacein (mg/L) | 80 | 40 | 20 |
| Number of cells (×1,000) | 110 | 110 | 110 |

Based on the results, what is the possible effect of the seaweed extract on C. violaceum? [1.5 marks]

A. The seaweed extract is an antibiotic as it does not allow the number of cells to exceed 110,000.

B. The seaweed extract is an antibiotic as it reduces the number of cells producing violacein.

C. The seaweed extract is a quorum-sensing inhibitor as it stops the cells from producing violacein, preventing them to multiply.

D. The seaweed extract is a quorum-sensing inhibitor as it prevents cells to communicate with each other without killing them.

(6) The upper arm has two types of muscles namely triceps and biceps. These muscles work against each other to produce movement. When an athlete lifts weights as illustrated in the picture on the right, what happens to his upper arm muscles? [1 mark]

| Option | Biceps | Triceps |
| --- | --- | --- |
| A | Contract | Contract |
| B | Relax | Relax |
| C | Contract | Relax |
| D | Relax | Contract |

(7) A block of ice with an iron nail embedded inside is floating on water in a beaker. The initial water level is marked on the side of the beaker. When the ice completely melts, the water level will be __________________ the original mark. [1 mark]

(8) The graph shows the activity of three human enzymes from different regions of the digestive tract with different pH.

Which of the following shows the correct grouping of enzyme and substrate being broken down? [1.5 mark]

| Option | Enzyme A | Enzyme B | Enzyme C |
| --- | --- | --- | --- |
| A | Protein | Lipid | Starch |
| B | Starch | Lipid | Starch |
| C | Protein | Starch | Lipid |
| D | Starch | Protein | Lipid |

(9) The diagram below shows the structures present between the mouth and the oesophagus.

Which of the following options CORRECTLY describes how Structures P and Q work together to prevent choking during the process of swallowing? [1 mark]

| Option | Structure P | Structure Q |
| --- | --- | --- |
| A | Moves up | Moves up |
| B | Moves down | Moves down |
| C | Moves up | Moves down |
| D | Moves down | Moves up |

(10) Komodo dragon (Varanus komodoensis), also known as Komodo monitor, is the national animal of Indonesia. It is a species of lizard found in the Indonesian islands of Komodo East Nusa Tenggara. Komodo dragons, the world’s largest lizard, are able to reproduce both sexually and asexually. They are parthenogenetic.

Which of the following statements correctly describe parthenogenetic animals? [1 mark]

(11) A student was given four pictures of animals as shown below: Goose, Whale, Deer, Seahorse.

He was told to group the animals correctly into the classification table below.

| Animals | Lay eggs: live on land | Lay eggs: live in water | Give birth to young alive: live on land | Give birth to young alive: live in water |
| --- | --- | --- | --- | --- |
| Position | W | X | Y | Z |

Which one of the following rows shows the correct answers for W, X, Y and Z? [1 mark]

| Option | W | X | Y | Z |
| --- | --- | --- | --- | --- |
| A | Goose | seahorse | Whale | Deer |
| B | Goose | Whale | seahorse | Deer |
| C | Deer | seahorse | Goose | whale |
| D | Goose | seahorse | Deer | whale |

A. Goose; seahorse; Whale; Deer

B. Goose; Whale; seahorse; Deer

C. Deer; seahorse; Goose; whale

D. Goose; seahorse; Deer; whale

(12) The table shows features of some blood vessels. Which set of features describes the pulmonary artery? [1 mark]

| Option | Muscle layer | Lumen | Direction of blood flow | Blood |
| --- | --- | --- | --- | --- |
| A | thick | narrow | away from the heart | deoxygenated |
| B | thick | wide | away from the heart | oxygenated |
| C | thin | narrow | towards the heart | oxygenated |
| D | thin | wide | towards the heart | deoxygenated |

(13) Enzymes are protein substances that digest food completely in the human digestive system. They are produced in various parts of the body such as the salivary glands, gastric glands and pancreas. Enzymes work differently at various temperatures. Which of the following graphs best represents how enzyme activity varies with temperature? [1 mark]

(14) When cyan and yellow paints are mixed together, the result is green. The reason for this is that ______. [1 mark]

(15) Agarose gel electrophoresis is a laboratory method used to separate DNA by size. In a gel electrophoresis, DNA molecules migrate from one end of the gel to the other end, where lighter molecules migrate faster than the heavier ones.

The parents of a new baby believe they brought the wrong child home from the hospital. Gel electrophoresis was performed using DNA samples from the parents and the child. A section of the gel electrophoresis results is shown below.

Which conclusion is valid based on the results? [1 mark]

(16) A student placed a marble in a glass tube. She observed that when she released the marble it rolled to the other end of the tube before rolling back downwards.

At which position will the marble reach before it rolls back downwards? [1 mark]

(17) The diagram shows a toy bird pivoted on a support and in stable equilibrium. When designing the toy bird, the manufacturer needs to plan the position of its center of gravity. Which position, A, B, C or D, should the center of gravity be? [1 mark]

(18) An ambulance moves through a street along the positive X direction and a person who stands beside the street hears the sound of the ambulance siren. Which option represents the frequency (f) received by the person? X is the position of the ambulance; the person stands at the origin. [1 mark]

A. Graph A in the original figure

B. Graph B in the original figure

C. Graph C in the original figure

D. Graph D in the original figure