Do NOT write on this worksheet

Answer all questions in your neat book – sketch diagrams where necessary

 

1.         (a)        What can happen if you pour boiling water into a glass?

(b)               Use the idea of expansion and contraction to explain why this occurs.

 

 

 

 

2.         (a)        Name a type of glass that does allow boiling water to be safely poured into it

 

(b)               How do you think this type of glass differs from ordinary glass to allow this?

 

 

 

 

3.                  What sort of glass would you use in an oven and why?

 

 

 

 

 

 

4.

 

5.        

 

Consider the diagram above.

 

(a)        Briefly explain why you think one end is constructed on rollers

 

(b)        When would you expect the gap to be bigger - in the wintertime or the summertime? (Explain why you think this would be)

 

(c)        What do you think would happen if the bridge had been constructed with no gap?  (Give an answer for construction in midwinter and then one for construction in midsummer)

 

 

6.                  Concrete slabs in the road are laid down with a gap between them.

This gap is filled with a soft substance such as sand.

 

Why is this done?

 

 

 

7.         A bomb makes use of the expansion of gases.

A gas expands much more than a liquid which in turn expands much more than a solid.

(a)               What do you think would be in danger of happening if you were to leave a half empty bottle of lemonade in the full glare of the sun on a hot summer's day?

 

(b)               Why do you think this might happen?

 

 

8.         Below is a diagram of a simple central-heating system.

 

 What is the purpose behind incorporating a 'feed and extension tank' into the system?

9.   Below is a diagram of a simple fire alarm.

Briefly explain how it works. (Hint: brass expands more than iron when they both undergo the same temperature rise).

 

10.       (a)        What is a thermostat?

A thermostat is used in an electric iron. Below is a diagram of such a thermostat.

(b)              What happens if the iron gets too hot?

(c)              What happens later when the iron cools again?

 

11.       Below is a diagram of a bimetallic thermometer

(a)        From the diagram deduce which metal expands to the greater degree for a given temperature rise; metal A or metal B.

(b)        Explain how you reasoned your way to the answer.