Science Quiz For Grade 9
Are you a ninth-grader having a hard time with your science classes? Worry no more; our Grade 9 Science Quiz with answers is perfect for helping you revise everything. We ask you to attempt all the questions on the quiz. Let's see how clear you are on your class topics. Give this quiz a fair shot, and keep an eye out for more tests like this designed to help you pass the final exams. Do share the quiz with your friends. Good luck & keep studying!
Science For Grade 9 Questions and Answers
- 1.
When is an atom considered stable?
- A.
When it has a full outer valence shell.
- B.
When it has the same amount of electrons as protons.
- C.
When it has no neutrons.
- D.
When it has an odd number of valence electrons.
Correct Answer
A. When it has a full outer valence shell.Explanation
When an atom has a full outer orbit or valence shell, it means that all the spaces in the outermost energy level of the atom are filled with electrons. This is a stable configuration for an atom because it satisfies the octet rule, which states that atoms tend to gain, lose, or share electrons in order to achieve a full outer shell. When the outer orbit is full, the atom is less likely to react with other atoms and is considered to be chemically stable.Rate this question:
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- 2.
An ion is formed when an atom loses/gains an electron.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
An ion is formed when an atom loses or gains an electron because the loss or gain of an electron creates an imbalance between the number of protons and electrons in the atom. If an atom loses an electron, it becomes positively charged and forms a cation. If an atom gains an electron, it becomes negatively charged and forms an anion. Therefore, the statement is true.Rate this question:
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- 3.
A molecule is the same thing as an atom.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
False. A molecule is not the same as an atom. An atom is the basic unit of an element, composed of a nucleus containing protons and neutrons, with electrons orbiting around. In contrast, a molecule consists of two or more atoms chemically bonded together. Molecules can be composed of the same or different types of atoms.Rate this question:
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- 4.
How many atoms are in Ca(NO3)2?
- A.
Ca-1 N-6 O-2
- B.
Ca-1 N-2 O-6
- C.
Ca-6 N-2 O-1
- D.
Ca-2 N-1 O-6
Correct Answer
B. Ca-1 N-2 O-6Explanation
The correct answer is Ca-1 N-2 O-6. There is one calcium atom (Ca), two nitrogen atoms (N), and six oxygen atoms (O) in the compound Ca(NO3)2. The subscript numbers indicate the number of each type of atom present in the molecule. The number of nitrogen atoms and oxygen atoms inside the parentheses is multiplied by 2 due to the 2 outside the parentheses.Rate this question:
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- 5.
Which does not necessarily indicate a chemical change has occurred?
- A.
Change of color
- B.
Heat is produced
- C.
Smell is produced
- D.
Light is produced
- E.
Gas is produced
Correct Answer
C. Smell is producedExplanation
The production of smell does not necessarily indicate a chemical change because it can also occur in physical changes. Smells can be produced when substances evaporate or when they are physically broken down, without any chemical reactions taking place. Therefore, the production of smell alone is not sufficient evidence to indicate a chemical change.Rate this question:
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- 6.
What is the equation for photosynthesis?
- A.
H2O+oxygen (light+chlorophyll) = CO2+glucose
- B.
H2O+CO2 (light+chlorophyll) = oxygen+glucose
- C.
CO2+light (chlorophyll +water) = H2O+oxygen
Correct Answer
B. H2O+CO2 (light+chlorophyll) = oxygen+glucoseExplanation
The equation for photosynthesis is H2O+CO2 (light+chlorophyll) = oxygen+glucose. This equation represents the process by which plants and some other organisms convert carbon dioxide and water into oxygen and glucose, using sunlight and chlorophyll as catalysts.Rate this question:
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- 7.
Photosynthesis provides us with... (more than one answer)
- A.
Energy
- B.
Water
- C.
Oxygen
- D.
Glucose
- E.
Light
Correct Answer(s)
A. Energy
C. Oxygen
D. GlucoseExplanation
Photosynthesis provides us with oxygen and glucose.
Oxygen: During photosynthesis, plants take in carbon dioxide (CO2) and water (H2O) and convert them into glucose and oxygen. The oxygen is released into the atmosphere, which is essential for the survival of most organisms on Earth, including humans.
Glucose: The glucose produced by plants during photosynthesis is a source of energy for many organisms. Herbivores eat plants to get this energy, and carnivores eat herbivores, thus the energy from photosynthesis flows through the food chain.
While photosynthesis does require light and water as inputs, it does not provide these as outputs. Therefore, “light” and “water” are not correct answers. As for “energy”, while it’s true that the glucose produced in photosynthesis stores energy that can be used by other organisms, the process itself does provide energy in a form that can be used by humans or animals.Rate this question:
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- 8.
Which of the following is not an interaction among ecosystems?
- A.
Competition
- B.
Mutualism
- C.
Equilibrium
- D.
Predation
Correct Answer
C. EquilibriumExplanation
Equilibrium is not an interaction among ecosystems. Equilibrium refers to a state of balance or stability within an ecosystem, where the population sizes and resources remain relatively constant over time. It does not involve any direct interaction between different ecosystems or organisms. In contrast, competition, mutualism, and predation are all types of interactions that occur between organisms in different ecosystems, influencing population dynamics and resource utilization.Rate this question:
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- 9.
Which of the following is not a limiting factor?
- A.
Climate extremes
- B.
Disease
- C.
Predation
- D.
Biodiversity
- E.
Human disturbances
- F.
Competition
Correct Answer
D. BiodiversityExplanation
Biodiversity is not a limiting factor because it refers to the variety of different species in an ecosystem, and does not directly limit the growth or survival of any particular species. Climate extremes, disease, predation, human disturbances, and competition can all limit the population size or distribution of certain species, but biodiversity itself is not a limiting factor in this context.Rate this question:
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- 10.
_________ is a measure of how many species live in an ecosystem.
Correct Answer
BiodiversityExplanation
Biodiversity is a measure of how many different species are present in a particular ecosystem. It quantifies the diversity of species within that ecosystem, indicating the number of different organisms that coexist in a given area. This measure does not take into account the abundance or population size of each species, but rather focuses on the total number of distinct species present.Rate this question:
- 11.
Bioamplification/biomagnification is when toxin levels increase at each trophic level.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Bioamplification, also known as biomagnification, is a process in which the concentration of toxins increases as they move up the food chain. This occurs because organisms at higher trophic levels consume a larger quantity of prey or plants that may contain toxins, resulting in the accumulation of these toxins in their bodies. As a result, the toxin levels become higher at each successive trophic level. Therefore, the statement "Bioamplification/biomagnification is when toxin levels get higher at each trophic level" is true.Rate this question:
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- 12.
____________ is when toxins build up in a single organism.
- A.
Bioamplification
- B.
Bioaccumulation
- C.
Biomagnification
Correct Answer
B. BioaccumulationExplanation
Bioaccumulation is the process by which toxins gradually accumulate in the tissues of an individual organism over time. This occurs when the organism is exposed to these toxins through its environment or food sources, and is unable to eliminate them at the same rate they are being absorbed. As a result, the concentration of toxins in the organism's body increases, leading to potential harmful effects on its health.Rate this question:
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- 13.
The order of the planets from closest to the Sun to furthest away is Mars, Venus, Earth, Mercury, Saturn, Uranus, and Neptune.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The correct order of the planets is: Mercury, Venus, Earth, Mars, Jupiter (not included in the question), Saturn, Uranus and NeptuneRate this question:
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- 14.
The Milky Way is a bar-shaped galaxy.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
True. The Milky Way is a barred spiral galaxy, characterized by a central bar-shaped structure composed of stars. The bar extends through the galactic center, and spiral arms emerge from the ends of the bar. This structure is a common feature in certain types of galaxies, including our own Milky Way.Rate this question:
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- 15.
Which of the following is the largest type of galaxy in the universe?
- A.
Spiral galaxy
- B.
Elliptical galaxy
- C.
Irregular galaxy
- D.
Dwarf galaxy
Correct Answer
B. Elliptical galaxyExplanation
The largest type of galaxy in the universe is the elliptical galaxy. These galaxies are characterized by their smooth, oval or elliptical shape and typically contain older stars with less interstellar gas and dust, resulting in less active star formation. Elliptical galaxies can vary in size, with some being small and others being massive. They are often found in regions of high galaxy density, such as galaxy clusters, and are one of the main classifications of galaxies based on their shape and structure.Rate this question:
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- 16.
A star is made of hydrogen and helium.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
A star is made up of hydrogen and helium because in the core of a star, nuclear fusion reactions occur where hydrogen atoms combine to form helium, releasing a tremendous amount of energy in the process. This energy is what makes the star shine and produce heat and light.Rate this question:
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- 17.
The Moon is not a satellite.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
False. The Moon is a natural satellite of Earth. It orbits our planet and is the fifth-largest natural satellite in the Solar System. The term "satellite" refers to any celestial body that orbits around a larger body, and the Moon fits this definition as Earth's only natural satellite.Rate this question:
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- 18.
A circumpolar constellation can be seen ____________
- A.
Once a year
- B.
All year round
- C.
Never
- D.
Once in every 100 years
Correct Answer
B. All year roundExplanation
A circumpolar constellation can be seen all year round. Circumpolar constellations are located near the celestial pole, either the North or South Pole, and appear to circle around it. As a result, they never dip below the horizon and are visible throughout the year. This is in contrast to other constellations that rise and set with the rotation of the Earth and may not be visible at certain times of the year.Rate this question:
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- 19.
What are some circumpolar constellations? (more than one)
- A.
Draco
- B.
Aquarius
- C.
Ursa Major
- D.
Ursa Minor
- E.
Leo
Correct Answer(s)
A. Draco
C. Ursa Major
D. Ursa MinorExplanation
The circumpolar constellations are those that never set below the horizon and can be seen year-round in the northern hemisphere. Draco, Ursa Major, and the Ursa Minor (Little Dipper ) are all examples of circumpolar constellations. These constellations are visible throughout the night and are easily recognizable due to their prominent stars and distinctive shapes. Aquarius and Leo, on the other hand, are not circumpolar constellations, as they are set below the horizon at certain times of the year.Rate this question:
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- 20.
The longest day of the year in the Northern Hemisphere is ________
Correct Answer(s)
june 21, June 21, 21 June, 21 june, June 21stExplanation
The longest day of the year in the Northern Hemisphere is the summer solstice, typically occurring around June 21st each year. During this time, the Northern Hemisphere experiences the longest period of daylight and the shortest night of the year.Rate this question:
- 21.
Static electricity only happens with conductors.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
False. Static electricity can occur with both conductors and insulators. While conductors allow the flow of electrons, insulators resist the flow. In static electricity, electrons can accumulate on the surface of insulators, creating a charge imbalance. This phenomenon is observed in various materials, not limited to conductors, as static charges can build up and discharge between objects with different electrical potentials.Rate this question:
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- 22.
When an atom gains an electron, it becomes an:
- A.
Cation
- B.
Anion
- C.
Onion
- D.
None of the above
Correct Answer
B. AnionExplanation
When an atom gains an electron, it becomes an anion. An anion is a negatively charged ion because it now has more electrons than protons. This results in an overall negative charge for the atom. A cation, on the other hand, is a positively charged ion formed when an atom loses an electron. "Onion" is not a term used in chemistry to describe the result of an atom gaining an electron.Rate this question:
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- 23.
In a circuit, the electrons flow from the _______ end to the ________ end. (Separate the two answers by a comma)
Correct Answer
negative, positive, -ve, +veExplanation
In a circuit, the electrons flow from the negative end (cathode) to the positive end (anode). This direction is opposite to the conventional current flow, which goes from the positive terminal to the negative terminal, a convention established by Benjamin Franklin in the 18th century.Rate this question:
- 24.
Why would you get an electric shock from an object?
- A.
Electrons hate you
- B.
Electrons discharge
- C.
Protons jump to an opposite charged object
- D.
Both a & b
Correct Answer
B. Electrons dischargeExplanation
When you get an electric shock from an object, it is because electrons want to discharge. Electrons are negatively charged particles that can build up on an object. When you touch that object, the excess electrons will try to move to a lower charge or neutral object, such as your body. This movement of electrons causes a sudden flow of electric current through your body, resulting in a shock sensation.Rate this question:
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- 25.
Which is not a method of electrical discharge?
- A.
At a point
- B.
A spark
- C.
Friction
- D.
Moisture
Correct Answer
C. FrictionExplanation
Friction is not a method of electrical discharge. Discharging refers to the process of releasing or removing an electrical charge. The options "at a point," "a spark," and "moisture" are all methods that can cause discharging. However, friction does not directly involve the release or removal of electrical charge. Instead, friction refers to the force that occurs when two surfaces rub against each other, which can generate static electricity but is not a method of discharging it.Rate this question:
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- 26.
A current is the only form of electricity.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
False. While electric current is a common form of electricity involving the flow of charged particles, it's not the only form. Static electricity, for instance, involves the imbalance of charges at rest. Additionally, there is alternating current (AC) and direct current (DC). AC periodically changes direction, while DC flows in one direction. Various phenomena and technologies encompass different forms of electrical activity.Rate this question:
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- 27.
What is not a method of creating static electricity?
- A.
Friction
- B.
Lightning
- C.
Contact
- D.
Induction
Correct Answer
B. LightningExplanation
Friction, contact, and induction are all methods of creating static electricity. When two objects rub against each other, like rubbing a balloon on your head, friction occurs and creates static electricity. Contact occurs when a charged object comes into direct contact with a neutral object, causing the neutral object to become charged. Induction involves bringing a charged object close to a neutral object, causing a separation of charges and creating static electricity. Lightning, on the other hand, is not a method of creating static electricity. It is a natural phenomenon that occurs due to the buildup and discharge of electrical energy in the atmosphere.Rate this question:
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Mar 22, 2024Quiz Edited by
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Jan 31, 2012Quiz Created by
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