Heat Energy Worksheet-3

Heat Energy Worksheet-3

1. Of the pairs of substances given below, which one contains only good conductors of heat?

(a) Wood and iron                        (b) Iron and glass

(c) Iron and copper                      (d) Copper and glass

2. The below experiment shows that heat causes solids to change in their..........

(a) Sizes             (b) States           (c) Shapes         (d) Composition

3. When a steel rod is heated, it becomes

(a) Lighter                                      (b) Heavier

(c) A little longer                          (d) A little shorter

4. Paperpins are stuck to a metal rod with wax and a lighted candle is put below the rod as shown in the diagram below:

Which one of the paperpins will fall off the metal rod first?

(a) P                    (b) Q                   (c) R                    (d) S

5. Which of the following is not an insulator of heat?

(a) Air                                             (b) Kerosene

(c) Aluminum                               (d) Rubber

6. The metal used in the cooling coils of air conditioners and refrigerators is made of:

(a) silver            (b) iron               (c) copper                   (d) zinc

7. The change of liquid into vapor form at any temperature is called:

(a) vaporization                            (b) evaporation

(c) gasification                              (d) none of these

8. The rate of evaporation of a liquid increases with the :

(a) increase in temperature of liquid

(b) increase in temperature of the surroundings

(c) increase in exposed surface area of the liquid

(d) all of these

9. Heat energy can be grouped under the general heading :

(a) potential energy

(b) kinetic energy

(c) Both potential and kinetic

(d) none of these

10. Magnetic energy can be classified as :

(a) kinetic energy

(b) potential energy

(c) Both potential and kinetic

(d) none of these

Answer Key:

1. (c)
2. (a)
3. (c)
4. (a)
5. (c)
6. (c)
7. (b)
8. (d)
9. (b)
10. (b)