In places of hot climate it is advised that the outer walls of houses be painted white because white colour reflects most of the heat that falls on it or we can say it absorbs less amount of heat. Therefore, the temperature inside the house does not increase very much. https://www.tiwariacademy.com/Read more
In places of hot climate it is advised that the outer walls of houses be painted white because white colour reflects most of the heat that falls on it or we can say it absorbs less amount of heat. Therefore, the temperature inside the house does not increase very much.
The air gets trapped between two layers of warm clothes. Air acts as insulator of heat. This layer prevents our body heat to escape in the surroundings. More layers of thin clothes will allow more air to get trapped and as a result we will not feel cold. So wearing more layers of clothing during winRead more
The air gets trapped between two layers of warm clothes. Air acts as insulator of heat. This layer prevents our body heat to escape in the surroundings. More layers of thin clothes will allow more air to get trapped and as a result we will not feel cold. So wearing more layers of clothing during winter keeps us warmer than wearing just one thick piece of clothing.
A cold steel spoon is dipped in a cup of hot milk. It transfers heat to its other end by the process of conduction. https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-4/
A cold steel spoon is dipped in a cup of hot milk. It transfers heat to its other end by the process of conduction.
A wooden spoon is dipped in a cup of ice cream. Its other end
(d) does not become cold. https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-4/
(d) does not become cold.
https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-4/
See lessOne litre of water at 30°C is mixed with one litre of water at 50°C. The temperature of the mixture will be
(d) between 30°C and 50°C https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-4/
(d) between 30°C and 50°C
https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-4/
See lessIn places of hot climate it is advised that the outer walls of houses be painted white. Explain.
In places of hot climate it is advised that the outer walls of houses be painted white because white colour reflects most of the heat that falls on it or we can say it absorbs less amount of heat. Therefore, the temperature inside the house does not increase very much. https://www.tiwariacademy.com/Read more
In places of hot climate it is advised that the outer walls of houses be painted white because white colour reflects most of the heat that falls on it or we can say it absorbs less amount of heat. Therefore, the temperature inside the house does not increase very much.
https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-4/
See lessDiscuss why wearing more layers of clothing during winter keeps us warmer than wearing just one thick piece of clothing.
The air gets trapped between two layers of warm clothes. Air acts as insulator of heat. This layer prevents our body heat to escape in the surroundings. More layers of thin clothes will allow more air to get trapped and as a result we will not feel cold. So wearing more layers of clothing during winRead more
The air gets trapped between two layers of warm clothes. Air acts as insulator of heat. This layer prevents our body heat to escape in the surroundings. More layers of thin clothes will allow more air to get trapped and as a result we will not feel cold. So wearing more layers of clothing during winter keeps us warmer than wearing just one thick piece of clothing.
https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-4/
See lessFill in the blanks: Clothes of ______________ colours absorb heat better than clothes of light colours.
Clothes of dark colours absorb heat better than clothes of light colours. https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-4/
Clothes of dark colours absorb heat better than clothes of light colours.
https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-4/
See lessFill in the blanks: A cold steel spoon is dipped in a cup of hot milk. It transfers heat to its other end by the process of ______________.
A cold steel spoon is dipped in a cup of hot milk. It transfers heat to its other end by the process of conduction. https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-4/
A cold steel spoon is dipped in a cup of hot milk. It transfers heat to its other end by the process of conduction.
https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-4/
See lessFill in the blanks: No medium is required for transfer of heat by the process of __________.
No medium is required for transfer of heat by the process of radiation. https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-4/
No medium is required for transfer of heat by the process of radiation.
https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-4/
See lessFill in the blanks: Temperature is measured in degree ______________.
Temperature is measured in degree Celsius. https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-4/
Temperature is measured in degree Celsius.
https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-4/
See lessFill in the blanks: Temperature of boiling water cannot be measured by a _____________ thermometer.
Temperature of boiling water cannot be measured by a clinical thermometer. https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-4/
Temperature of boiling water cannot be measured by a clinical thermometer.
https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-4/
See lessFill in the blanks: The hotness of an object is determined by its __________.
The hotness of an object is determined by its temperature. https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-4/
The hotness of an object is determined by its temperature.
https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-4/
See less