Q. What is the primary function of antacids?
-
A.
To relieve pain
-
B.
To reduce acidity
-
C.
To increase appetite
-
D.
To promote digestion
Solution
Antacids are used to neutralize stomach acidity and relieve heartburn.
Correct Answer: B — To reduce acidity
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Q. What is the primary function of baking soda in cooking?
-
A.
Thickening agent
-
B.
Leavening agent
-
C.
Flavor enhancer
-
D.
Preservative
Solution
Baking soda acts as a leavening agent, helping baked goods rise by producing carbon dioxide when reacting with acids.
Correct Answer: B — Leavening agent
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Q. What is the primary function of carbohydrates in living organisms?
-
A.
Energy storage
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B.
Genetic information
-
C.
Catalysis
-
D.
Structural support
Solution
Carbohydrates primarily serve as a source of energy in living organisms.
Correct Answer: A — Energy storage
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Q. What is the primary function of emulsifiers in food products?
-
A.
Thickeners
-
B.
Stabilizers
-
C.
Flavor enhancers
-
D.
Coloring agents
Solution
Emulsifiers help stabilize mixtures of oil and water, preventing separation.
Correct Answer: B — Stabilizers
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Q. What is the primary function of enzymes in biological systems?
-
A.
Store energy
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B.
Speed up chemical reactions
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C.
Provide structural support
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D.
Transport molecules
Solution
Enzymes act as catalysts to speed up chemical reactions in biological systems.
Correct Answer: B — Speed up chemical reactions
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Q. What is the primary function of enzymes?
-
A.
Store energy
-
B.
Speed up chemical reactions
-
C.
Provide structure
-
D.
Transport substances
Solution
Enzymes are biological catalysts that speed up chemical reactions in the body.
Correct Answer: B — Speed up chemical reactions
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Q. What is the primary function of fluoride in dental care products?
-
A.
Whitening teeth
-
B.
Preventing cavities
-
C.
Freshening breath
-
D.
Strengthening gums
Solution
Fluoride helps to prevent cavities by strengthening tooth enamel and making it more resistant to decay.
Correct Answer: B — Preventing cavities
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Q. What is the primary function of fluoride in dental care?
-
A.
Whitening teeth
-
B.
Preventing cavities
-
C.
Strengthening enamel
-
D.
Reducing sensitivity
Solution
Fluoride helps to strengthen tooth enamel and prevent cavities.
Correct Answer: C — Strengthening enamel
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Q. What is the primary function of lipids in biological systems?
-
A.
Energy storage
-
B.
Catalysis
-
C.
Genetic information
-
D.
Structural support
Solution
Lipids serve as a major form of energy storage in organisms.
Correct Answer: A — Energy storage
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Q. What is the primary function of preservatives in food?
-
A.
Enhance flavor
-
B.
Improve texture
-
C.
Prevent spoilage
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D.
Increase nutritional value
Solution
Preservatives are added to food to prevent spoilage caused by microorganisms.
Correct Answer: C — Prevent spoilage
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Q. What is the primary function of soap in cleaning?
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A.
Disinfecting
-
B.
Emulsifying
-
C.
Oxidizing
-
D.
Reducing
Solution
Soap acts as an emulsifier, allowing water to mix with oils and dirt for effective cleaning.
Correct Answer: B — Emulsifying
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Q. What is the primary greenhouse gas emitted through human activities?
-
A.
Carbon Dioxide
-
B.
Methane
-
C.
Nitrous Oxide
-
D.
Ozone
Solution
Carbon Dioxide (CO2) is the primary greenhouse gas emitted through human activities, particularly from the burning of fossil fuels.
Correct Answer: A — Carbon Dioxide
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Q. What is the primary intermolecular force present in gases?
-
A.
Hydrogen bonding
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B.
Dipole-dipole interactions
-
C.
London dispersion forces
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D.
Ionic bonding
Solution
London dispersion forces are the primary intermolecular forces in gases, as they are weak and allow for greater movement.
Correct Answer: C — London dispersion forces
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Q. What is the primary intermolecular force present in liquid water?
-
A.
Ionic bonds
-
B.
Covalent bonds
-
C.
Hydrogen bonds
-
D.
Van der Waals forces
Solution
Water molecules are held together primarily by hydrogen bonds.
Correct Answer: C — Hydrogen bonds
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Q. What is the primary intermolecular force present in liquids?
-
A.
Ionic bonds
-
B.
Covalent bonds
-
C.
Dispersion forces
-
D.
Dipole-dipole interactions
Solution
Liquids primarily exhibit dipole-dipole interactions due to the presence of polar molecules.
Correct Answer: D — Dipole-dipole interactions
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Q. What is the primary intermolecular force present in water?
-
A.
Ionic bonds
-
B.
Covalent bonds
-
C.
Hydrogen bonds
-
D.
Van der Waals forces
Solution
Water exhibits hydrogen bonding due to the presence of O-H bonds.
Correct Answer: C — Hydrogen bonds
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Q. What is the primary mechanism of adsorption in physisorption?
-
A.
Chemical bonding
-
B.
Van der Waals forces
-
C.
Hydrogen bonding
-
D.
Ionic bonding
Solution
Physisorption occurs primarily due to weak Van der Waals forces.
Correct Answer: B — Van der Waals forces
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Q. What is the primary mechanism of current flow in semiconductors?
-
A.
Electron flow only
-
B.
Hole flow only
-
C.
Both electron and hole flow
-
D.
Ionic flow
Solution
Current flow in semiconductors occurs due to the movement of both electrons and holes.
Correct Answer: C — Both electron and hole flow
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Q. What is the primary mechanism of heat transfer in a vacuum?
-
A.
Conduction
-
B.
Convection
-
C.
Radiation
-
D.
None of the above
Solution
In a vacuum, heat transfer occurs primarily through radiation, as there are no particles to conduct or convect heat.
Correct Answer: C — Radiation
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Q. What is the primary mechanism of heat transfer in liquids and gases?
-
A.
Conduction
-
B.
Convection
-
C.
Radiation
-
D.
Insulation
Solution
In liquids and gases, convection is the primary mechanism of heat transfer, as it involves the movement of fluid.
Correct Answer: B — Convection
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Q. What is the primary mechanism of heat transfer in liquids?
-
A.
Conduction
-
B.
Convection
-
C.
Radiation
-
D.
All of the above
Solution
In liquids, convection is the primary mechanism of heat transfer, although conduction and radiation can also occur.
Correct Answer: B — Convection
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Q. What is the primary method for reducing carbon emissions in urban areas?
-
A.
Increasing fossil fuel use
-
B.
Promoting public transportation
-
C.
Encouraging deforestation
-
D.
Reducing recycling efforts
Solution
Promoting public transportation is a primary method for reducing carbon emissions in urban areas.
Correct Answer: B — Promoting public transportation
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Q. What is the primary method for treating wastewater?
-
A.
Filtration
-
B.
Chlorination
-
C.
Biological treatment
-
D.
Incineration
Solution
Biological treatment is the primary method for treating wastewater, utilizing microorganisms to break down organic matter.
Correct Answer: C — Biological treatment
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Q. What is the primary method of heat transfer from the Sun to the Earth?
-
A.
Conduction
-
B.
Convection
-
C.
Radiation
-
D.
Conduction and Convection
Solution
The primary method of heat transfer from the Sun to the Earth is radiation, as it travels through the vacuum of space.
Correct Answer: C — Radiation
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Q. What is the primary method of reducing carbon emissions in transportation?
-
A.
Switching to electric vehicles
-
B.
Increasing fossil fuel use
-
C.
Using more plastic
-
D.
Reducing public transport
Solution
Switching to electric vehicles is a primary method of reducing carbon emissions in transportation.
Correct Answer: A — Switching to electric vehicles
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Q. What is the primary method of treating wastewater?
-
A.
Incineration
-
B.
Filtration
-
C.
Biological treatment
-
D.
Chemical treatment
Solution
Biological treatment is a common method for treating wastewater, utilizing microorganisms to break down organic matter.
Correct Answer: C — Biological treatment
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Q. What is the primary method used to treat wastewater?
-
A.
Filtration
-
B.
Sedimentation
-
C.
Biological treatment
-
D.
Chemical treatment
Solution
Biological treatment is the primary method used to treat wastewater, utilizing microorganisms to break down organic matter.
Correct Answer: C — Biological treatment
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Q. What is the primary mode of heat transfer from the Sun to the Earth?
-
A.
Conduction
-
B.
Convection
-
C.
Radiation
-
D.
Conduction and Convection
Solution
The primary mode of heat transfer from the Sun to the Earth is radiation, as it travels through the vacuum of space.
Correct Answer: C — Radiation
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Q. What is the primary mode of heat transfer in a vacuum?
-
A.
Conduction
-
B.
Convection
-
C.
Radiation
-
D.
Insulation
Solution
In a vacuum, there are no particles to conduct or convect heat, so radiation is the only mode of heat transfer.
Correct Answer: C — Radiation
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Q. What is the primary mode of heat transfer in liquids and gases?
-
A.
Conduction
-
B.
Convection
-
C.
Radiation
-
D.
None of the above
Solution
Convection is the primary mode of heat transfer in liquids and gases due to the movement of the fluid.
Correct Answer: B — Convection
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