4b Heat II

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Question 1 of 11

1. Question
1 point(s)
A glass of hot water is covered with an airtight lid and left to cool. Why is it difficult to lift the lid when the water is cold.
- The air pressure in the glass is lower than the atmospheric pressure when the water is cold.
- The lid become wet and hence stick to the glass.
- The force between the water molecules become stronger when the water is cold.
- The water vapour condense in the glass and hence increase the mass of the water.
Correct

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Question 2 of 11

2. Question
1 point(s)
The air pressure in a tyre is 240 kPa at a temperature of 20°C. Find the pressure of the air when the temperature increases to 50°C. (Give your answer correct to 3 significant figure)
- 265,000 Pa
- 260,000 Pa
- 255,000 Pa
- 270,000 Pa
Correct

Incorrect
Question 3 of 11

3. Question
1 point(s)
Figure (a) above shows some air is trapped in a capillary tube by a mercury column of 5cm. Figure (b) shows the condition when the capillary tube is held horizontal. Find the length, h, of the air trapped in (b). (Atmospheric pressure = 75cmHg)
- 16.5 cm
- 16.0 cm
- 14.4 cm
- 14.1 cm
Correct

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Question 4 of 11

4. Question
1 point(s)
A fish releases a bubble of air of volume 1cm³ at the bottom of a lake. The depth of the lake is 10m. Find the volume of the bubble when it reaches the surface of the pond. (Assume that the atmospheric pressure is equal to 10m of water)
- 1 cm³
- 2 cm³
- 3 cm³
- 4 cm³
- 5 cm³
Correct

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Question 5 of 11

5. Question
1 point(s)
The figure shows some air trapped in a capillary tube. Given that the temperature of the air is 27°C. Find the length of the air column when the temperature of the air is increased to 87°C.
- 7.2 cm
- 19.3 cm
- 12.8 cm
- 17.7 cm
Correct

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Question 6 of 11

6. Question
1 point(s)
Which of the following graphs shows the relationship between pressure, P, and volume, V of a gas at constant temperature?
Correct

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Question 7 of 11

7. Question
1 point(s)
Water take a shorter time to boil at a region of high altitude (Such as Genting Highland) compare with a region of low altitude although the same amount of energy is used. This is because
- I. the boiling point of the liquid is lower at high altitude
- II. the specific heat capacity of the liquid is lower at high altitude
- III. the atmospheric pressure is lower at high altitude
- IV. the temperature is lower at high altitude
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Question 8 of 11

8. Question
1 point(s)
Given that the boiling point of pure water is 100°C at room temperature and pressure. What will happen to the boiling point when some salt is added to the water?
- higher than 100°C
- lower than 100°C
- remain at 100°C
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Question 9 of 11

9. Question
1 point(s)
How much heat must be removed by a refrigerator from 500g of water at 25 °C to totally convert it to ice cubes at 0°C? [Specific heat capacity of water = 4200J kg^-1 °C^-1; Specific latent heat of fusion of ice = 334,000 Jkg^-1]
- 52,500 J
- 167,000 J
- 219,500 J
- 114,500 J
Correct

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Question 10 of 11

10. Question
1 point(s)
How much heat energy is needed to completely convert water of mass 1kg at 50°C to steam at 100°C? (Specific heat capacity of water = 4200 Jkg^-1°C^-1; Specific latent heat of vaporisation of water = 2,260,000 Jkg^-1)
- 210,000 J
- 2,260,000 J
- 2,470,000 J
- 2,050,000 J
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Question 11 of 11

11. Question
1 point(s)
The figure above shows the experiment set up to determine the specific latent heat of fusion. What is the purpose of the control set in the experiment?
- To determine how fast the ice melt.
- To determine the amount of ice melt without the heater.
- To determine the average value of the specific latent heat of fusion of ice.
- To compare the rate of the ice melt in the 2 experiment setups.
Correct

Incorrect