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Science grade 7I Flashcards | StudBud
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Science grade 7I
Science grade 7I
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1
Newton’s First Law: What will happen to an object if no force acts on it at all?
It will stay still or keep moving the same way
Objects will accelerate unless a force acts on them
Objects will stop moving when they encounter friction
It will move in circles
2
Quantum Mechanics:
Which of the following statements about quantum physics is true?
Observing a quantum system does not affect its state.
Particles can exist in multiple states at once until observed.
Particles always have a fixed position and velocity.
Electrons orbit the nucleus in perfect circular paths
3
Ecosystems: What type of organism breaks down dead plants and animals in an ecosystem?
Producers
Decomposers
Carnivores
Herbivores
4
Quantum Physics
: Electrons move in fixed orbits around the nucleus, like planets around the Sun.
False
True
5
Theoretical Physics:
Which of the following statements about the nature of reality is true?
Quantum entanglement can send information faster than light.
The act of observing a quantum particle changes its state.
The universe exists only in physical form, independent of observation.
Time flows at the same rate everywhere in the universe.
6
Thermodynamics:
A system at absolute zero (-273.15°C) still has some molecular motion.
True
False
7
Advanced Chemistry:
Which of the following statements about chemical bonding is true?
All metals lose electrons to become stable.
Ionic bonds form when atoms share electrons equally.
Covalent bonds are weaker than hydrogen bonds.
Metallic bonding allows electrons to move freely, creating conductivity.
8
Astronomy:
The universe is expanding at an increasing rate due to dark energy.
False
True
9
Chemical Reactions: What type of reaction occurs when a substance reacts with oxygen to release energy?
Precipitation reaction
Combustion reaction
Acid-base reaction
Synthesis reaction
10
The Human Body: What is the main function of red blood cells?
Fight infections and viruses.
Carry oxygen from the lungs to the body.
Help in digestion of food.
Carry oxygen from the muscles to the lungs.
11
Photosynthesis: During photosynthesis, which of the following is produced by plants?
Carbon monoxide
Nitrogen
Water
Oxygen
12
Water Cycle: What process in the water cycle turns liquid water into gas?
Condensation
Freezing
Evaporation
Precipitation
13
Chemistry:
Helium is the only element that cannot become a solid, no matter how cold it gets.
False
True
14
Astrophysics:
Which of the following statements about black holes is true?
Black holes suck in everything around them like a vacuum.
Time slows down near a black hole due to extreme gravity.
Black holes are just very dense stars with normal gravity.
Black holes destroy all matter that enters them instantly.
15
Photosynthesis:
What do plants most need to make their own food?
02, water, and sunlight
CO2, water, and Sugar
CO2, water, and Soil
CO2, water, and Sunlight
16
Biology & Genetics:
Mitochondrial DNA is inherited from both parents equally.
True
False
17
The Solar System: What is the primary reason for the seasons on Earth?
Earth’s rotation speed increases during certain months.
Earth’s tilt on its axis causes different parts to receive more sunlight.
The Sun's energy level changes throughout the year.
Earth's distance from the sun changes.
18
Advanced Chemistry:
Which of the following statements about chemical bonding is true?
Ionic bonds form when atoms share electrons equally.
Covalent bonds are weaker than hydrogen bonds.
All metals lose electrons to become stable.
Metallic bonding allows electrons to move freely, creating conductivity.
19
Cosmology & The Universe:
Which of the following statements about the origin of the universe is true?
The universe is infinite and has always existed.
The laws of physics we know might not have existed before the Big Bang.
Before the Big Bang, time and space existed in a different form.
The Big Bang was an explosion in empty space.
