Questions and Answers
Air is less dense than water because its molecules are further apart.
True
What is 100C in Fahrenheit?
212F
Why does salt help to melt ice?
It lowers the temperature at which water freezes.
What is the principal gas in the earth's atmosphere?
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If the tire of a car rotates at a constant speed of 552 times in one minute, how many times will it rotate in half an hour?
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In a town of 810 people, if one in every 9 votes for party A, how many vote for party B?
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A motorcycle costs 7,250. If it depreciates by 12% per year, how much will it be worth after one year?
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If a faucet gives 20 gallons of water in 5 seconds, how many gallons does it provide in 7 seconds?
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Antagonize most nearly means?
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Wilted most nearly means?
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What does 'apprehension' mean in the context of the statement 'His record provides no reason for apprehension'?
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Quiver most nearly means?
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Study Notes
Density of Air and Water
- Air has a lower density than water due to the arrangement of its molecules, which are spaced further apart.
Temperature Conversion
- The freezing point of water in Celsius (100°C) is equivalent to 212°F in Fahrenheit.
Salt and Ice Melting
- Salt lowers the freezing point of water, aiding in the melting of ice.
Earth's Atmosphere
- Nitrogen is the principal gas that constitutes the Earth's atmosphere.
Tire Rotation Calculation
- A car tire rotating 552 times per minute will make a total of 16,560 rotations in 30 minutes (552 x 30).
Voting Dynamics
- In a town of 810 people, with 1 in every 9 voting for party A, 720 people would vote for party B.
Motorcycle Depreciation
- A motorcycle priced at $7,250, depreciating 12% in one year, will be valued at $6,380 after one year.
Water Flow Calculation
- A faucet delivering 20 gallons of water in 5 seconds will provide 28 gallons in 7 seconds.
Vocabulary: Antagonize
- To antagonize means to provoke or instigate someone, often in a negative manner.
Vocabulary: Wilted
- The term wilted describes something that is limp or drooping, typically used for plants or flowers.
Vocabulary: Apprehension
- Apprehension refers to a feeling of anxiety or unease about a future event.
Vocabulary: Quiver
- To quiver means to shake or tremble slightly, often due to nervousness or emotion.
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Description
Test your knowledge on various scientific concepts including the density of air and water, temperature conversions, and the effects of salt on ice melting. Additionally, challenge yourself with practical math problems related to tire rotations and water flow rates. This quiz covers a range of topics that blend science with everyday applications.
