Question

4. Why are gaps left between lengths of rail in
a railway line?
6. Draw a labelled diagram of a clinical
thermometer. Explain the function of the
kink in the stem.
5. Convert.
(i) 66 °C into °F
(ii) 37 °C into °F
7. State two differences between a laboratory
thermometer and a clinical thermometer.
Give the reason for each difference.
(iii) 212 °F into °C
(iv) 135 °F into °C
Higher-order Thinking Skills
1. A special kind of glass is used as ovenware for baking. What property should such glass have to
prevent it from breaking?
2. What problem will you have in using a laboratory thermometer to measure your body temperature?
3. If you fill too much air in your bicycle tyres in summer, there is a chance it might burst. Why?
4. The figure shows a strip made up of brass and iron strips riveted
together at both ends. Given that brass expands more than iron on
heating, what do you think will happen when this strip is heated?
Fig. 4.8
Life Skills​

Answer 1

Answer:

there are gaps left between lengths of rail in

a railway line

Explanation:

The gaps left between successive rails on a railway track, the reason is that the rails expand in summer. The gap is provided to allow for this expansion. If no gap is left, the expansion in summer will cause the rails to bend sideways. That will result in train accidents.

Answer 2

Answers:

Here's is yours answers

1. Gaps are left between railway tracks because on summers at high temperatures they expand and on winters at less temperatures they contract

2. In clinical thermometer , mercury chemical is used . Numbers are labeled on the front of it . When temperature is high the mercury chemical rises up and on cooler temperature it goes down

3. 66°C into °F = 150.8°F

• 37°C into °F = 98.60000000000001°F

4. In Laboratory thermometer , no mercury chemical is used only electronic way is used in them and in clinical thermometer mercury chemical used which rises up according to the temperatures.

5. 212°F into °C = 100°C

• 135°F into °C = 57.22222222222222°C

6. The Glass has High Heat tolerance which avoid it from breaking.

7. Because laboratory thermometer is not used as human body temperature . As it contains mercury which can give wrong temperature.

8. Because it cannot hold much air.

9.