Heat - Worksheets

 CBSE Worksheet-01

Class – VII Science (Heat)

---

1. The heat in metals is conducted by the process of
   1. Radiation
   2. Convection
   3. Conduction
   4. Absorption
2. Glass, plastic, wood are examples of
   1. Conductor
   2. Insulator
   3. Convectors
   4. Radiators
3. During the night
   1. Land cools more quickly than the sea
   2. Sea cools quickly than the land
   3. Land heats up
   4. Sea water heats up
4. Temperature is measured with the help of
   1. Thermometer
   2. Barometer
   3. Ammeter
   4. Voltmeter
5. Match the following

   Column A	Column B
   a. Sea breeze	i. Insulator
   b. Land breeze	ii. From sea to land
   c. Light colour	iii. From land to sea
   d. Glass	iv. Direct molecular contact
   e. Conduction	v. Summer

6. Fill in the blanks.
   1. Water and air are _______ conductor of heat.
   2. _______ is the liquid used in thermometer.
   3. _______ is the degree of hotness of the body.
   4. Liquid and gases transfer heat by _______ method.
   5. Metals are _______ conductor of heat.
7. What is convection? How heat is transferred by this method?
8. Why is mercury used in thermometers?
9. What is heat? How heat is different from temperature?
10. Classify the following as conductors and insulators:
    Glass, Iron, Aluminium, Air, Water, Woolen cloth, Silver, Paper.
11. State similarities and differences between the laboratory thermometer and the clinical thermometer.

CBSE Worksheet-01
Class – VII Science (Heat)
Answer key

---

1. c
2. b
3. a
4. a
5. (a) – (ii), (b) – (iii), (c) – (v), (d) – (i), (e) – (iv).
6. 1. bad
   2. Mercury
   3. Temperature
   4. conduction
   5. good.
7. Convection is the transfer of heat by the movement of molecules of liquids and gases. On heating, liquids and gases become lighter and rise up. The cooler, heavier fluids move down and take the place of warmer fluids.
8. 1. Expansion of mercury is uniform over a wide range of temperature.
   2. Can be seen from outside glass.
   3. Does not stick to the glass.
9. Heat is a form of energy. On the other hand, temperature is the degree of hotness and coldness of a substance. Temperature can be changed by changing providing heat energy to the body.

10. Conductor	Insulator
    Glass	Iron
    Air	Aluminium
    Woolen cloth	Water
    Paper	Silver

11. Similarities:
    1. Both clinical and laboratory thermometers have long, narrow, uniform glass tubes.
    2. The bulbs of both the thermometers have mercury in them.
    Differences:
    1. The temperature range of clinical thermometers is from 35°C to 42°C while that of laboratory thermometer is from −10°C to 110°C.
    2. Clinical thermometer is used to measure the temperature of a human body.
       However, laboratory thermometer cannot be used to measure the temperature of a human body.
    3. The least count of both the thermometers differs.
    4. Unlike clinical thermometer that can be tilted, laboratory thermometer is kept upright while reading the temperature values.