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NBF 10th class physics new book notes, Summaries of Physics

University of Education (UE)Physics
Prof. Rashid Saleem

NBF 10th class physics new book notes ch#01 short response question answers.

Typology: Summaries

2024/2025

Available from 05/17/2025

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areej-jutt-1 🇵🇰

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UNIT 10
HEAT CAPACITY AND MODES OF HEAT TRANSFER
Give a short response to the following questions.
Q1:Why should we wear dark-coloured clothes in winter and white-coloured clothes
in summer?
Ans:Dark-colored clothes absorb more sunlight and heat, keeping us warm in winter.
White-colored clothes reflect sunlight and heat, keeping us cooler in summer.
Q2. In a house, geysers or water boilers are fitted on the ground floor, and still, we
get warm water on the top floor without using a pump. How is it possible?
And:This is possible due to convection currents in the water pipes, where heated water
rises naturally to the top floor. As hot water expands and becomes less dense, it flows
upward, allowing warm water to reach the top floor without a pump.
Q3: Where will you get more heat from the wood fire, 1 meter above the woods or 1
meter from the front of the woods?
Ans:You’ll get more heat 1 meter above the woods due to rising warm air and heat
convection. In contrast, 1 meter in front of the woods, the heat will be less intense due to
heat dissipation.
Q4. Why do crowded city areas feel hotter compared to the outskirts on a hot
summer day?
Ans:Crowded city areas feel hotter due to the urban heat island effect, where buildings,
pavement, and infrastructure absorb and retain heat. Cities also have less vegetation and
more human activity, contributing to increased temperatures compared to outskirts.
Q5:Why is the is the metallic handle of a door colder than the wood of the same door
when touched?
Ans:The metallic handle feels colder because metal is a better conductor of heat, quickly
drawing heat away from your hand. Wood, being a poor conductor, doesn’t draw heat
away as quickly, making it feel warmer by comparison.
Q6:How do trees help reduce the effects of climate change, and what could happen if
forests are depleted?
Ans:Trees help reduce the effects of climate change in several ways:
1.Carbon Sequestration
2.Oxygen Production
3. Climate Regulation
If forests are depleted
1. Increased Greenhouse Gases
2. Loss of Biodiversity
3. Soil Erosion
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UNIT 10

HEAT CAPACITY AND MODES OF HEAT TRANSFER

Give a short response to the following questions. Q1:Why should we wear dark-coloured clothes in winter and white-coloured clothes in summer? Ans: Dark-colored clothes absorb more sunlight and heat, keeping us warm in winter. White-colored clothes reflect sunlight and heat, keeping us cooler in summer. Q2. In a house, geysers or water boilers are fitted on the ground floor, and still, we get warm water on the top floor without using a pump. How is it possible? And :This is possible due to convection currents in the water pipes, where heated water rises naturally to the top floor. As hot water expands and becomes less dense, it flows upward, allowing warm water to reach the top floor without a pump. Q3: Where will you get more heat from the wood fire, 1 meter above the woods or 1 meter from the front of the woods? Ans: You’ll get more heat 1 meter above the woods due to rising warm air and heat convection. In contrast, 1 meter in front of the woods, the heat will be less intense due to heat dissipation. Q4. Why do crowded city areas feel hotter compared to the outskirts on a hot summer day? Ans: Crowded city areas feel hotter due to the urban heat island effect, where buildings, pavement, and infrastructure absorb and retain heat. Cities also have less vegetation and more human activity, contributing to increased temperatures compared to outskirts. Q5:Why is the is the metallic handle of a door colder than the wood of the same door when touched? Ans: The metallic handle feels colder because metal is a better conductor of heat, quickly drawing heat away from your hand. Wood, being a poor conductor, doesn’t draw heat away as quickly, making it feel warmer by comparison. Q6:How do trees help reduce the effects of climate change, and what could happen if forests are depleted? Ans: Trees help reduce the effects of climate change in several ways: 1.Carbon Sequestration 2.Oxygen Production

  1. Climate Regulation If forests are depleted
  2. Increased Greenhouse Gases
  3. Loss of Biodiversity
  4. Soil Erosion

Q7:How does gravity contribute to the Earth’s core temperature? Ans :1.Primordial Heat 2.Core Compression

  1. Radioactive Decay These processes contribute to the Earth’s internal heat budget, maintaining the core’s high temperature. Gravity’s role is crucial in shaping the Earth’s internal dynamics and heat generation. Q8:Why do certain gases in the atmosphere trap more heat than others? Ans:1. Molecular vibrations: Gases like CO2, CH4, and H2O have molecular structures that vibrate at frequencies matching infrared radiation, allowing them to absorb and retain heat.
  2. Greenhouse effect: These gases trap heat in the atmosphere, contributing to global warming. Q9:What are the potential environmental impacts of extraction of geothermal energy? Ans: Geothermal energy extraction can cause land subsidence, water pollution, and release of harmful gases. It may also affect local ecosystems and induce seismicity. Proper management and monitoring can mitigate these impacts. Q10:How does the specific heat capacity of different materials affect their use in cookware? Ans: Materials with high specific heat capacity, like cast iron, retain heat well and distribute it evenly, making them ideal for cookware. Low specific heat capacity materials, like copper, heat up quickly but may require more precise temperature control. Choosing the right material depends on cooking needs and techniques. Q11: Water at 20°C is sent deep underground into heated layers, where it turns into a mix of steam and hot water at 100°C. As the steam and hot water cool back down to 20°C, why does 1 kg of steam release more energy than 1 kg of hot water? Ans: Steam releases more energy because it contains latent heat of vaporization, which is released when it condenses to water. This latent heat is additional to the energy released as the water cools. Hot water only releases energy as it cools, without the extra latent heat component.