Heat Energy Worksheet-6

Heat Energy Worksheet-6

1. Which one is correct relation between ºC and ºF?

(a)

(b)

(c)

(d)

2. The normal temperature of human body is

(a) 47 ºC            (b) 25 ºC            (c) 37 ºC            (d) 60 ºC

3. Four boxes made of different materials are left under the Sun for half an hour. Which one of the boxes will be the hottest after half an hour?

(a)

(b)

(c)

(d)

4. A pot full of water is put to boil on the stove. Which one of the graphs below shows the correct change in temperature over time?

(a)

(b)

(c)

(d)

5. The heat energy from the sun comes to us by the process of:

(a) radiation                                  (b) conduction

(c) convection                                (d) none of these

6. Black bodies are:

(a) good absorbers and poor radiators of heat energy

(b) poor absorbers and good radiators of heat energy

(c) good absorbers and good radiators of heat energy

(d) poor absorbers and poor radiators of heat energy

7. The increase in length of a solid on heating is called :

(a) length expansion                   (b) linear expansion

(c) superficial expansion            (d) cubical expansion

8. Iron rims of slightly smaller diameter are mounted on the wooden wheels of cart because :

(a) iron does not allow the wooden wheel to wear off

(b) iron expands on heating and slips over the wooden wheel

(c) iron strengthens the wheel

(d) none of these

9. The process due to which a solid changes into a liquid state at some fixed temperature by the absorption of heat energy is called :

(a) melting                                     (b) fusion

(c) liquation                                   (d) melting or fusion

10. The fixed temperature at which a solid changes into liquid state on the absorption of heat energy is called:

(a) melting point                          (b) fusion point

(c) melting or fusion point         (d) none of these

Answer Key:

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