Heat Energy

Heat Energy Worksheet-1

1. When you put a metal key into its metal lock, you find the key is too tight. Which of the following methods will you adopt to make the key fit properly?

(a) Heat the key and lock

(b) Cool the key and heat the lock

(c) Heat the key and cool the lock

(d) Cool the key and lock

2. Rohan wants to test whether a white object or a black object would heat up faster in the Sun. The picture shows you his experiment. These thermometers were left out in the Sun for 30 minutes:

Which of the following statements is true?

Heat Energy Worksheet-2

1. A scientist took a metal rod and a wooden rod and wrapped each of them in a piece of paper. These were then heated as shown. It was found that the paper around the metal rod does not burn whereas the one around the wooden rod catches fire. It is because

(a) Iron being a good conductor, conducts away heat given to paper

(b) Wood being an insulator, takes away all the heat

(c) Candle in case of iron rod, is near to the paper

(d) Paper, in first case, it thicker

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