CBSE Class 7 Science Heat Worksheet with Solution by Expert Science Mam. Students of 7th Grade can solve this worksheet for extra preparation before exam. Private Teacher or Guardians of the Students can copy all the questions of this chapter and will match after solve their students.
Heat Class 7 Worksheet
Worksheet for Chapter No.4): – HEAT
The following questions are important for your exams for 1 mark 2 mark or 5 marks. First solve the questions on your own and then saw the solution for understanding it better.
Practice worksheet for class 7
Section A
Q.1) Define the following terms?
1) Temperature- A reliable major of the hotness of an object is its temperature.
2.) Thermometer – A device which is used to measure temperature of an object is called as thermometer.
Q.2.) What is clinical thermometer?
→ The thermometer that measures our body temperature is called as clinical thermometer.
Q.3.) Which metal is present in clinical thermometer?
→ Mercury is present inside thermometer.
Q.4.) What is the normal temperature of human body?
→ The normal temperature of human body is 37 degrees Celsius.
Q.5.) Is the body temperature of all human beings is a same ?
→ The temperature of every person may not be same. It could be slightly higher or slightly lower.
Q.6.) What is maximum minimum thermometer?
→ The maximum and minimum temperatures of the previous day reported in weather reports are measured by a thermometer called as maximum minimum thermometer.
Q.7.) What is the range of laboratory thermometer?
→ The range of laboratory thermometer Is -10 degree Celsius to 110 degree Celsius.
Q.8.) Is the clinical thermometer used for laboratory purpose?
→ No, a clinical thermometer is designed to major the temperature of human body only.
Q.9.) Can we use the laboratory thermometer to measure our body temperature?
→ No, it is not convenient to use the laboratory thermometer to measure our body temperature.
Q.10.) What is the role of kink used in clinical thermometer?
→ The role of kink used in clinical thermometer is to prevent mercury level from falling on its own.
Q.11.) Why there is concern of using Mercury in the clinical thermometers ?
→ Mercury is a toxic substance and it is very difficult to dispose of if a thermometer breaks.
Q.12.) What is conduction?
→ The process by which heat is transferred from the hotel end to the colder and of an object is known as conduction.
Q.13.) What are the conductors ? Give two examples?
→ The material which allows heat to pass through them easily are conductors of heat.
Example:- aluminum, iron and copper.
Q.14.) What are the insulators? Give two examples?
→ The materials which do not allowed heat to pass through them easily are poor conductors of heat called as insulators.
Example:- plastic and wood.
Q.15.) Is water the conductor of heat ? how does heat transfer takes place in water ?
→ No , water is the poor conductor of heat. When water is heated the water near the flame or the source of heat gets hot. Hot water rises up and the cold water from the sides move down towards the source of the heat and this water also gets hot and rises and water from the sides move down this process continuous till the whole water gets heated by the process of convection.
Q.16.) Define convection ?
→ Convection is the mode of heat transfer in which the process of heating the water and air continues till the whole water and air gets heated.
Q.17.) Is the heat comes from a sun is by the process of convection ?
→ No, the heat comes from a Sun to us by the process of radiation.
Q.18.) Why we use dark-coloured clothes in winters and light-coloured clothes in summers?
→ Dark surface absorbs more heat and their four we fill comfortable with dark-coloured clothes in the winter. Light Colour clothes reflect most of the heat that falls on them and therefore, we feel more comfortable wearing them in the summer.
Q.19.) Is the Wool poor conductor or good conductor of heat. Why we use woolen clothes in winter.
→ Wool is a poor conductor of heat. In winters, the air trap in between the woolen fibers these airs prevent the flow of heat from our body to the cold surroundings so we feel warm.
Q.20.) How many ways are there for the heat transfer ?
→ There are three ways for heat transfer.
1.) Conduction
2.) Convection
3.) Radiation
Q.21.) Why it is advised to paint the outer wall of the House white in hot places ?
→ Light colour reflects most of the heat that falls on them. So, if we paint the outer wall of the house in white colour then all the heat falling on white wall gets reflected and the house is protected from outer hot surrounding.
Q.22.) Which of the following is preferable in winters One thick woolen blanket or layer of two thin woolen blankets ?
→ Two thin woolen blankets are preferable in winter for use than one thick woolen blanket because there is extra layer to trap between two woolen blankets which acts as insulator and does not allow body heat to flow out.
Q.23.) Define the following terms?
1.) Sea breeze :- the warm air from the land move towards the sea to complete the cycle the air from the sea is called as sea breeze.
2.) Land breeze:- at night the water cools down more slowly than the land so the cool air from the land move towards the sea this is called the land breeze.
Q.24.) What are the precautions should we take while using a clinical thermometer?
1.) Thermometer should be watched before and after use with an antiseptic solution.
2.) Ensure that before use the Mercury level is below 35 degrees Celsius
3.) Read the thermometer keeping the level of Mercury along the line of sight.
4.) Handle the thermometer with care if it hits against some hard object, it can be break.
5.) Do not hold the thermometer by the bulb while reading it.