Heat Energy Worksheet-1

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?

(a) Thermometer 1 reads the same as thermometer 3

(b) Thermometer 2 shows a higher temperature than thermometer 3

(c) Thermometer 3 shows higher temperature than thermometer 1

(d) Thermometer 1 reads the same as thermometer 2

3. The mode of transmission of heat which requires no medium is called :

(a) conduction                               (b) radiation

(c) convection                                (d) none of these

4. Heat flows always

(a) From hotter body to a colder body

(b) From colder to a hotter body

(c) In both the directions

(d) Never flows from one body to the other

5. A bimetallic strip is used in:

(a) automatic fire alarm             (b) automatic electric iron

(c) automatic electric oven        (d) all of these

6. The expansion in liquid and gases on heating is called :

(a) linear expansion                     (b) cubical expansion

(c) superficial expansion            (d) none of these

7. The process due to which a liquid changes into gaseous state at some fixed temperature, with the absorption of heat energy, is called :

(a) Vaporization                           (b) Boiling

(c) vaporization or boiling          (d) none of these

8. The fixed temperature at which a liquid state changes into gaseous state, due to the process of vaporization, is called :

(a) boiling point                            (b) vaporization point

(c) vaporization or boiling          (d) none of these

9. Energy is capable of doing :

(a) Work                                         (b) pushing a wall

(c) Digestion                                  (d) None of these

10. A body can have potential energy on account of :

(a) its position only                      (b) its configuration only

(c) Position or configuration     (d) None of these

Answer Key:

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