Class 7 Science Chapter 4 Heat Extra Questions
Class 7 Science Chapter 4 Heat Extra Questions | Class 7 Science Extra Question Answer | for all the students of CBSE / ICSE /State Board…
Define The Following Terms:-
A reliable measure of the hotness of an object is its temperature. Temperature is measured by a device called a thermometer.
A clinical thermometer consists of a long, narrow, uniform glass tube. It has a bulb at one end. This bulb contains mercury. Outside the bulb, a small shining thread of mercury can be seen. A clinical thermometer reads temperatures from 35°C to 42°C. The thermometer that measures our body temperature is called a clinical thermometer.
The process by which heat is transferred from the hotter end to the colder end of an object is known as conduction.
What are the 3 ways in which heat is transferred?
Heat can be transferred from a hot object to a cold object in three different ways :
- by conduction,
- by convection, and
- by radiation ( heat rays).
Which thermometer is not used to measure body temperature?
the temperature is expressed in the unit of ‘degree Celsius’A laboratory thermometer cannot be used to measure the human body temperature.
Why clinical thermometer has a range between 35 to 42 degrees C
The temperature of the human body normally does not go below 35oC or above 42oC. That is the reason that this thermometer has a range of 35oC to 42oC.
Why do woolen clothes keep us warm during winter?
Woolen clothes keep us warm during winter. It is so because wool is a poor conductor of heat and it has air trapped in between the fibers.
Fill in the blanks:-
…………are materials that allow heat to pass through them easily.[ Conductors]
Poor conductors are known as ………..[insulators]
The water and air are poor conductors of ……..[heat]
Winds blowing from the sea towards the land are known as ……….[sea breezes]
A …………is a breeze blowing from the land towards the sea.[ land breeze]
The heat from the sun reaches on the earth by the process of ………..[radiation]
The quantity that measures the hotness or coldness of an object is called……[temperature]
The instrument used to measure temperature is called………..[thermometer]
All matter is made up of tiny particles called ________[molecules]
Temperature is measured by………….[thermometer]
All _________ are good conductors of heat.[metals]
Water is ________ conductors of heat.[poor]
A gentle wind is called0……..[ breeze]
The normal temperature of the human body is ……….[37°C.]
…………are materials that do not allow heat to pass through them easily.[ insulators]