Class 7
SUBJECT- SCIENCE
HEAT
Revision assignment 1
Q1 State two impotant facts about Heat.
Q2 How do we express degree of hotness of a body?
Q3 Does a cold object possesses heat energy? Why? How is the temperature of an object related to the motion of its particles?
Q4 How many types of thermometers are there?
Q5 Explain the construction of an ordinary mercury thermometer.
Q6 Complete the answer of given question by filling up suitable words.
Ø What are the physical effects of heat?
i. Change in _____ : Addition of heat ____ the temperature of object whereas removal of heat ______ it.
ii. Change of state: When heat is added to a solid, it changes into ______ and when heat is added into a _______, it changes into a _____.Similarly when heat is removed, ______ changes into _____ and ______ into ______.
iii. ___________: Most solids, ______ and _______ _______ on heating.
Ø What chemical effect does heat show?
i. Many ________ reactions occur on heating the _____. For example oxygen can be prepared on heating ________ with _______ as a catalyst over a flame.
Ø What are the differences between clinical thermometer and laboratory thermometer?
There are two differences-
1. The range of _____thermometer is from 35°C to _____ whereas the range of_______ thermometer is from -10°C to 110°C.
2. _______ thermometer has a slight bend or ________ in its capillary tube whereas _______ thermometer does not have any such bend or _____.
Q7 A special instrument used to measure temperature is called __________.
Q8 The difference in the temperature of the two fixed reference points is called the _____ of the
thermometer.
Q9 The scales used to measure the temperature are ________ & ________.
Q10 A specially designed and calibrated thermometer to measure our body temperature is known
as the _____________.
Q11 Why does a clinical thermometer has a constriction?
