International STEM Olympiad Science Past Papers

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Which of these statements is true about ultrasound waves?

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

Which of the following is a characteristic of prokaryotic cells?

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

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

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

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

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

What is produced when ammonia reacts with water?

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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