Chemistry
What is the element formula of Magnesium?
A: Ma
B: Mn
C: Me
D: Mg
E: M
D: Mg
Which parts of a tree are living (multiple correct)
A: Bark
B: Wood
C: Sap
D: Branch
E: Leaves
A: Bark
&
E: Leaves
What is the unit of force?
N (Newton) or kg x m/s^2
What is the closest star to Earth?
The Sun!
Why does cutting down large areas of forests contribute to climate change?
Trees absorb carbon dioxide through photosynthesis. Cutting them down reduces CO₂ absorption, and burning or decomposing trees releases stored carbon into the atmosphere.
What is a chemical change?
A: a shift in polarizability of electron cloud
B: transfer of electrons between molecules
C: a reaction that changes the substance itself
D: a change in the state of matter
E: a reaction where the nucleus of an element is split
C: a reaction that changes the substance itself
What is the cell membrane made out of?
A: Water
B: Fat
C: Proteins
D: Carbohydrates
E: Plasma
B: Fat
What is the magnitude of the acceleration due to gravity?
9.8m/s^2
What is the name of our home galaxy?
The Milky Way
What is the term for an area where land meets the ocean?
A) Peninsula
B) Estuary
C) Coastline
D) Watershed
C) Coastline
Which of the following is not acidic?
A: Vinegar
B: Lemon juice
C: Carbonated water
D: Carbon dioxide gas
E: Baking soda
E: Baking soda
What is an ability something must have to be considered living?
A: Ability to generate waste (ie. animal fecal matter)
B: Ability to replicate itself (ie. cell division)
C: Ability to react to light (ie. photosynthesis)
D: Ability to maintain homeostasis (ie. temperature regulation)
E: Ability to undergo gas exchange (ie. breathing)
D: Ability to maintain homeostasis
Which one has a greater coefficient of kinetic friction, ice or a blanket?
Blanket
Which planet in the solar system has the most confirmed moons?
Saturn
A city replaces a large concrete parking lot with trees, grass, and gardens. Give two environmental benefits this could provide.
It can reduce the urban heat island effect, absorb rainwater and reduce flooding, provide habitats for wildlife, and improve air quality. Any two are acceptable.
What is the state of glass?
A: Solid
B: Liquid
C: Gas
D: Plasma
E: Supercritical fluid
A: Solid
Why does shivering heat you up?
A: Some chemical energy that is used to power muscles is wasted to generate heat
B: Friction between muscle fibres generates heat
C: Rapid movement of muscles induces circulation of warm blood
D: Repetitive movement burns fat to generate heat E: All of the above
A: Some chemical energy that is used to power muscles is wasted to generate heat.
When a ball is dropped from a high altitude, considering air resistance, how will its acceleration change?
The acceleration will decrease to zero
What is the name of the boundary around a black hole, beyond which nothing can escape, not even light?
The event horizon
Which term describes the process by which harmful substances become more concentrated in organisms at higher levels of a food chain?
A) Bioaccumulation
B) Biomagnification
C) Deposition
D) Trophic transfer
B) Biomagnification
Given: An iron rod can support 500kg before breaking. A carbon graphite rod can support 5kg before breaking. A high-carbon steel rod can support more than 1000kg.
Question: Which of the following theories explains these observations correctly?
A: A high-carbon steel rod does not have carbon in it
B: Steel is an alloy, and carbon coats the exterior to prevent oxidation(rusting) of the iron
C: Carbon atoms fit between the gaps between iron atoms and increase grip between layers of iron atoms.
D: Carbon graphite is hard and brittle, which complements the malleability of iron.
E: Carbon is a nonmetal that takes electrons from the iron atoms to increase density.
C: Carbon atoms fit between the gaps between iron atoms and increase grip between layers of iron atoms.
ATP is known as the currency of energy in cells. Which of the following is correct?
A: ATP is generated in the mitochondria only
B: ATP can only be generated in the presence of oxygen
C: ATP is synthesized through photosynthesis
D: ATP is used as a long-term energy supply
E: ATP is a building block of RNA
E: ATP is a building block of RNA
What physical quantity does a scale measure when an object is placed on it?
The normal force exerted on an object
What is the farthest man-made object from Earth?
Voyager 1
A lake receives fertilizer runoff from nearby farms. A few weeks later, large algae blooms appear, and fish begin dying. Explain the chain of events that causes the fish to die.
Fertilizer adds excess nutrients, especially nitrogen and phosphorus, to the lake. This causes algae to grow rapidly. When algae die, decomposers break them down and consume dissolved oxygen, leaving too little oxygen for fish to survive. This process is called eutrophication.