Everyday Science— Concepts, Formulas & Shortcuts
- Light travels far faster than sound, so lightning is seen before thunder is heard.
- Refraction makes a straw appear bent where it enters water.
- A pressure cooker raises the boiling point of water, cooking food faster.
- Iron rusts in the presence of both oxygen and moisture.
- Convection currents explain why hot air rises and cool air sinks.
- Evaporation causes cooling, which is why sweating lowers body temperature.
Everyday Science Practice Questions with Answers
Attempt each question first, then open the explanation. All 8 questions below are free to read and require no signup.
Q1.We see lightning before hearing thunder because:
Easy- ALight is brighter
- BLight travels faster than sound
- CThunder occurs later
- DSound is absorbed
Everyday Science question 1 of 8+Show Answer & Explanation
Answer: B. Light travels faster than sound
Explanation: Light travels roughly a million times faster than sound through air.
Q2.A straw in a glass of water appears bent because of:
Easy- AReflection
- BRefraction
- CDiffraction
- DDispersion
Everyday Science question 2 of 8+Show Answer & Explanation
Answer: B. Refraction
Explanation: Light bends as it passes between water and air, shifting the apparent position of the straw.
Q3.A pressure cooker cooks food faster because it:
Moderate- ALowers the boiling point
- BRaises the boiling point of water
- CRemoves air
- DAdds heat directly
Everyday Science question 3 of 8+Show Answer & Explanation
Answer: B. Raises the boiling point of water
Explanation: Higher pressure raises the boiling point, so food cooks at a temperature above 100 °C.
Q4.Sweating cools the body because of:
Moderate- AConduction
- BEvaporation
- CRadiation
- DConvection
Everyday Science question 4 of 8+Show Answer & Explanation
Answer: B. Evaporation
Explanation: Evaporating sweat draws latent heat from the skin, lowering its temperature.
Q5.Iron rusts in the presence of:
Easy- AOxygen only
- BWater only
- CBoth oxygen and moisture
- DNitrogen
Everyday Science question 5 of 8+Show Answer & Explanation
Answer: C. Both oxygen and moisture
Explanation: Rusting is oxidation that requires both oxygen and water to proceed.
Q6.Hot air rises because it is:
Easy- AHeavier than cold air
- BLess dense than cold air
- CMore humid
- DElectrically charged
Everyday Science question 6 of 8+Show Answer & Explanation
Answer: B. Less dense than cold air
Explanation: Heating expands air, lowering its density so that it floats above cooler air.
Q7.Why does food cook more slowly at high altitudes?
Difficult- ALess oxygen
- BLower atmospheric pressure lowers the boiling point
- CColder air
- DThinner utensils
Everyday Science question 7 of 8+Show Answer & Explanation
Answer: B. Lower atmospheric pressure lowers the boiling point
Explanation: Reduced pressure means water boils below 100 °C, so food cooks at a lower temperature.
Q8.A person feels cool after applying spirit on the skin because spirit:
Moderate- AIs cold
- BEvaporates quickly, absorbing heat
- CConducts heat
- DReflects light
Everyday Science question 8 of 8+Show Answer & Explanation
Answer: B. Evaporates quickly, absorbing heat
Explanation: Rapid evaporation removes latent heat from the skin, producing a cooling sensation.
Everyday Science — Frequently Asked Questions
Why does a pressure cooker cook food faster?+
Trapped steam raises the internal pressure, which raises the boiling point of water above 100 °C. Food cooks at that higher temperature, so it cooks faster.
Why do we see lightning before hearing thunder?+
Light travels at about 3 × 10⁸ m/s while sound travels at roughly 343 m/s in air, so light from the same event reaches us almost instantly.
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