HEAT, WORKSHEET 1 (class7)

1.A reliable measure of the hotness of an object is its___________________
2. The range of a clinical thermometer in Celsius scale is_____________________& in         Fahrenheit is_____________________________
3. The range of laboratory thermometer is_______________________
4. ____________________________thermometer does not use mercury.
5. Heat is transferred in liquids by________________________
6. We receive heat from sun by__________________________
7. Heat travels through solids by_________________________
8. The maximum and minimum temperatures of the previous day, reported in weather reports, are measured by thermometer called the______________________thermometer.
9. Thermal energy flows between objects due to difference in___________
10.When a liquid is heated it___________
11.Convection current gives rise to ___________
12.Dark colours are good___________ of heat.
13.The degree of hotness or coldness in a substance is called ___________
14.___________ is a conductor of heat.
15.The thermos flask is made up of double walled glass vessels because glass is a ___________
16.In solids transfer of heat can take place by ___________
17.Mercury is a liquid metal in ___________
18.The form of energy that flows from hot object to a cold object is called ___________
19.The boiling point of water in the Celsius scale is ___________
20.The transfer of energy between object that are in physical contact is by ___________
21.The ___________ in a clinical thermometer prevents backflow of the Mercury into the bulb.
22.The handle of cooking utensils are made of material that are___________
23.The vacuum in a thermos flask reduces the heat loss due to___________

24.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

25.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

26.Identify which one are good conductor and poor conductors of heat

(a) Water
(b) Copper
(c) Air
(d) Plastic
(e) wood
(f) Iron
(g) Aluminium

27. 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-

28. Name two good conductors of heat?