Chapter Heat worksheet , Class VII

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

2. 1. Name two good conductors of heat? 1
2. Why is mercury used in thermometers? 1
3. What is the normal temperature of human body in t & F? 1
4. What is the lowest point of an ordinary laboratory thermometer? 1
5. How does the fur of the polar bear help it to live in the Arctic region? 1
6. 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-
7. Convert the given temperature to degree Celsius. 3
(a) 150 degree F
(b) 48 degree F
8. Convert the given temperature to degree Fahrenheit. 3
(a) 150 degree C
(b) 32 degree C
9. What precautions should be observed while reading a clinical thermometer? 2
10. Explain sea breeze and land breeze with the help of a diagram. 3
11. Define the following terms: i. Heat ii. Temperature iii. Conduction iv. Convection 4