In this page we have Class 7 Science Chapter 4: Heat Extra Questions with Answers . Hope you like them and do not forget to like , social share
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Fill in the blanks
a. A reliable measure of the hotness of an object is its___________________
b. The range of a clinical thermometer in Celsius scale is_____________________& in Fahrenheit is_____________________________
c. The range of laboratory thermometer is_______________________
d. ____________________________thermometer does not use mercury.
e. Heat is transferred in liquids by________________________
f. We receive heat from sun by__________________________
g. Heat travels through solids by_________________________
h. The maximum and minimum temperatures of the previous day, reported in weather reports, are measured by thermometer called the______________________thermometer.
1.Thermal energy flows between objects due to difference in___________
2.When a liquid is heated it___________
3.Convection current gives rise to ___________
4.Dark colours are good___________ of heat.
5.The degree of hotness or coldness in a substance is called ___________
6.___________ is a conductor of heat.
7.The thermos flask is made up of double walled glass vessels because glass is a ___________
8.In solids transfer of heat can take place by ___________
9.Mercury is a liquid metal in ___________
10.The form of energy that flows from hot object to a cold object is called ___________
11.The boiling point of water in the Celsius scale is ___________
12.The transfer of energy between object that are in physical contact is by ___________
13.The ___________ in a clinical thermometer prevents backflow of the Mercury into the bulb.
14.The handle of cooking utensils are made of material that are___________
15.The vacuum in a thermos flask reduces the heat loss due to___________
Multiple Choice Questions
A marble tile would feel cold as compared to a wooden tile on a winter morning, because the marble tile
(a) is a better conductor of heat than the wooden tile.
(b) is polished while wooden tile is not polished.
(c) reflects more heat than wooden tile.
(d) is a poor conductor of heat than the wooden tile
X and Y measured their body temperature.X found its to be 98.6 °F and Y recorded 37 °C. Which of the followng statement is true?
(a) X has a higher body temperature than Y.
(b) X has a lower body temperature than Y.
(c) Both have normal body temperature.
(d) Both are suffering from fever.
Identify which one are good conductor and poor conductors of heat
Short Answer type questions
Name two good conductors of heat?
What is the lowest point of an ordinary laboratory thermometer?
Why is the bulb of the thermometer made of thin glass?
How is temperature different from thermal energy?
How do we read a laboratory thermometer?
How does the fur of the polar bear help it to live in the Arctic region?
Why does cold water kept in an open container become warm on a hot summer afternoon?
How do woolen garments keep us warm?
Answer the following in one word each:
(a) The SI unit of heat-
(b) The SI unit of Temperature-
(c) The instrument used to measure the temperature-
(d) The transfer of heat from hotter part to a colder part of an object due to vibration of a particles-
(e) The material that do not conduct heat-
Convert the given temperature to degree Celsius.
(a) 150 degree F
(b) 48 degree F
Convert the given temperature to degree fahrenheit.
(a) 150 degree C
(b) 32 degree C
Practice Questions Questions
What is the normal temperature of human body in t & F?
Why is mercury used in thermometers?
What precautions should be observed while reading a clinical thermometer?
What precautions should be observed measuring temperature with a laboratory thermometer?
Give reason why :-
(a) Rooms are provided with ventilators & exhaust fans near top of side walls.
(b) It is advisable to place room heaters at the ground level for effective heating.
(c) Air conditioners should be installed at the top windows.
Shopkeepers selling ice blocks usually cover them with jute sacks. Explain why.
Explain sea breeze and land breeze with the help of a diagram.
Why is the box of solar cooker painted black from inside?
What are the two conditions necessary for the conduction of heat?
Define the following terms :
What is thermal energy?
What does the temperature of a substance indicate?
Write briefly about any two commonly used temperature scales?
What is a heat insulator?
How does transfer of heat take place?
Explain the formation of sea breeze and land breeze?
How is temperature different from thermal energy?
Write the difference between the clinical laboratory and maximum minimum thermometers?
Define the following:
What is the relation between the Celsius scale and the fahrenheit scale?
Explain the three modes of heat transfer? Which mode of heat transfer takes place in fluid?
Explain the construction and working of a clinical thermometer with the help of a labelled diagram?
A liquid having a temperature of 48 degree Celsius and placed on a table acquires a stable temperature of 36 degree Celsius. What is the room temperature and what season could it be?
Explain the construction and working of a thermos flask with the help of a labelled diagram?
How does a thermos flask maintain the temperature of liquid kept in it?
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