International STEM Olympiad Science Past Papers

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Questions and Answers

What happens to the sound produced by the bell when the air is removed from the glass jar?

The sound disappears entirely. (correct)

The sound becomes louder.

The sound becomes quieter.

The sound remains the same.

Which of the following statements correctly describes the behavior of the magnet in a vacuum?

The magnetic field created by the magnet is strengthened in a vacuum.

The magnetic field created by the magnet is completely eliminated in a vacuum.

The magnetic field created by the magnet is weakened in a vacuum.

The magnetic field created by the magnet is unaffected by the vacuum. (correct)

Which of the following statements correctly describes the propagation of light in a vacuum?

Light travels at the same speed in a vacuum and in air.

Light travels faster in a vacuum than in air. (correct)

Light cannot travel through a vacuum.

Light travels slower in a vacuum than in air.

What is the primary process responsible for the generation of solar energy?

Nuclear fusion, where lighter atoms combine to form heavier atoms. (C) Signup and view all the answers

Solar energy is a result of the conversion of which element into which other element?

Hydrogen into helium. (B) Signup and view all the answers

What is the primary distinction between ultrasound waves and sound waves audible to humans in terms of their frequencies?

Ultrasound waves have higher frequencies than audible sound waves. (C) Signup and view all the answers

Which of the following best describes the primary function of a sonogram?

To create a visual image of the baby in the womb. (A) Signup and view all the answers

Which of the following statements correctly describes the relationship between ultrasound waves and human hearing?

Ultrasound waves are entirely outside the range of human hearing. (A) Signup and view all the answers

When a person runs towards a stationary sound source, what happens to the frequency of the sound they hear?

The frequency increases. (C) Signup and view all the answers

Based on the figure, how does the sound appear to the observer when they are moving towards the stationary sound source?

The sound waves appear closer together. (D) Signup and view all the answers

Which of the following is true about sound waves propagating in the same medium?

The speed of sound can vary depending on the medium. (D) Signup and view all the answers

Which of these statements about sound waves from two sources in the same medium is absolutely correct?

The speed of the sounds from the two sources can be different. (C) Signup and view all the answers

What is the difference between a sound wave and a light wave?

Sound waves are transverse waves, while light waves are longitudinal waves. (C) Signup and view all the answers

What is the relationship between the frequency and wavelength of a sound wave?

Frequency and wavelength are inversely proportional - as frequency increases, wavelength decreases. (C) Signup and view all the answers

Which of these statements is true about ultrasound waves?

Ultrasound waves can be used to create images of internal body structures. (A) Signup and view all the answers

The conversion of hydrogen gas into helium in the sun's core is an example of what type of energy production?

Nuclear fusion (C) Signup and view all the answers

Which of the following is a characteristic of prokaryotic cells?

Single-celled organisms (A) Signup and view all the answers

What process do plants utilize to convert sunlight into chemical energy?

Photosynthesis (A) Signup and view all the answers

Which of the following is an example of a biotic factor in an ecosystem?

Predators (A) Signup and view all the answers

What is the approximate mass of table salt presented in the options?

58.5 g (D) Signup and view all the answers

Which of the following statements is true regarding eukaryotic cells compared to prokaryotic cells?

Eukaryotic cells have a nucleus (C) Signup and view all the answers

Which type of phosphorus is known for being white and is highly reactive?

White phosphorus (A) Signup and view all the answers

What is produced when ammonia reacts with water?

Ammonium hydroxide (B) Signup and view all the answers

Which of the following statements about the dissociation of ammonium hydroxide is incorrect?

Ammonium hydroxide fully dissociates in water. (A) Signup and view all the answers

Which of the following types of carbon shares a similar atomic structure to diamond, graphite, and fullerenes?

Coal (A) Signup and view all the answers

Which option correctly lists the states of nitrogen in the reaction between ammonia and water?

NH3, NH4+, OH- (D) Signup and view all the answers

What is the correct order, from greatest to smallest, for the amount of oxygen?

III > I > II (B) Signup and view all the answers

When mixing sodium hydroxide with ammonium chloride, what would be expected?

Production of ammonia gas (A) Signup and view all the answers

Which form of phosphorus is characterized by being structurally stable with layered arrangements?

Black phosphorus (A) Signup and view all the answers

What is the term used for a powerful explosion that happens when a high-mass star completes its life cycle?

Supernova (C) Signup and view all the answers

What phenomenon occurs when the pitch of an ambulance siren changes as it approaches and then passes you?

Doppler effect (A) Signup and view all the answers

What happens to light waves when a luminous source is moving towards us?

They have shorter wavelengths. (C) Signup and view all the answers

What occurs when stars at the edges of a galaxy move faster than gravity alone can explain?

They hint at dark matter. (A) Signup and view all the answers

What happens to light waves when the source is moving away from us?

They appear redder. (A) Signup and view all the answers

What is inadequate to account for the dynamics of galaxies as observed through their movements?

Observable mass. (C) Signup and view all the answers

What type of wave behaves similarly to light waves when it comes to movement and perception?

Sound waves (A) Signup and view all the answers

What leads to observing a discrepancy in the speed of stars in galaxies?

Insufficient visible mass. (C) Signup and view all the answers

What happens to the electrons in the metal during a photoelectric experiment when photons strike the surface?

Electrons are released or ejected from the metal. (D) Signup and view all the answers

Which color of light is likely to result in the maximum number of electrons being ejected from the metal in the experiment?

Blue light (C) Signup and view all the answers

If the metal rod in the experiment moves up and down at a faster rate, which change will occur related to the wave?

The wavelength of the wave decreases. (D) Signup and view all the answers

During a photoelectric experiment, if the wavelength of the light increases, what can be inferred about the energy of the photons?

The energy of the photons decreases. (A) Signup and view all the answers

In the context of a photoelectric experiment, which statement about the relationship between frequency and wavelength is true?

Frequency and wavelength are inversely related. (A) Signup and view all the answers

Which of the following statements accurately describes the behavior of photons in the photoelectric effect?

Photons must have a certain minimum energy to eject electrons. (C) Signup and view all the answers

Which of the following could be a potential outcome when using light with a longer wavelength in a photoelectric experiment?

Ejection of electrons decreases significantly. (A) Signup and view all the answers

If the frequency of the wave created by the upward and downward motion of the metal rod increases, what must happen to the wavelength?

The wavelength decreases. (C) Signup and view all the answers

Study Notes

International STEM Olympiad Grand Final - Science Past Papers

Target Grades: 9-10-11
Content: Collection of past science questions for the International STEM Olympiad Grand Final.
Topic Coverage: Includes questions on various science concepts, including:
- Nuclear fusion
- Solar energy
- Ultrasound
- Sound waves
- Electromagnetic waves
- Atomic structure
- Properties of elements and compounds
- Photoelectric effect
- Characteristics of cells
- Ecosystem factors
- Vestigial structures
- Compund formation
- Properties of gold

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Description

This quiz features a collection of past science questions tailored for students in grades 9-11, focusing on key concepts relevant to the International STEM Olympiad Grand Final. Topics range from nuclear fusion and solar energy to atomic structure and the properties of elements and compounds. Test your knowledge and prepare for success in science competitions!