Class VII Science Chapter Heat worksheet.pptx

Chapter Heat worksheet , Class VII

1. Class Test – VII Subject- Science Chapter 4: Heat Fill the blanks: 2 Thermal energy flows between objects due to difference in___________ Convection current gives rise to ___________ The degree of hotness or coldness in a substance is called ___________ ___________ is a conductor of heat. The thermos flask is made up of double walled glass vessels because glass is a ____ In solids transfer of heat can take place by ___________ The form of energy that flows from hot object to a cold object is called ________ The boiling point of water in the Celsius scale is ___________ The transfer of energy between object that are in physical contact is by________ The ___ in a clinical thermometer prevents backflow of the Mercury into the bulb. The handle of cooking utensils are made of material that are___________ The vacuum in a thermos flask reduces the heat loss due to___________ Jumbled Words: 1 Jumbled Word Oocdncntiu Mrehmeeottr Tuermrtpeea atruolnsI

2. Name two good conductors of heat? 1 Why is mercury used in thermometers? 1 What is the normal temperature of human body in t & F? 1 What is the lowest point of an ordinary laboratory thermometer? 1 How does the fur of the polar bear help it to live in the Arctic region? 1 Answer the following in one word each: 2 (a) The SI unit of heat- (b) The SI unit of 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. 3 (a) 150 degree F (b) 48 degree F Convert the given temperature to degree Fahrenheit. 3 (a) 150 degree C (b) 32 degree C What precautions should be observed while reading a clinical thermometer? 2 Explain sea breeze and land breeze with the help of a diagram. 3 Define the following terms: i . Heat ii . Temperature iii. Conduction iv . Convection 4