WBCHSE Class 11 Physics Change Of State Of Matter Multiple Choice Questions

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Unit 7 Properties Of Bulk Matter Chapter 8 Change Of State Of Matter Multiple Choice Questions And Answers

Question 1. The approximate value of latent heat of melting of ice in SI is

  1. 0.336 J · kg-1
  2. 3.36 x 105 J · kg-1
  3. 80 kcal · kg-1
  4. 80000 J · kg-1

Answer: 2. 3.36 x 105 J · kg-1

Question 2. The function of the latent heat during vaporisation is

  1. Breaking the crystalline structures of the molecules of the substance
  2. Restoring the crystalline structure of the molecules of the substance
  3. Increasing the intermolecular separation of the substance
  4. Decreasing the intermolecular separation of the substance

Answer: 3. Increasing the intermolecular separation of the substance

Question 3. Different articles of iron can be prepared by casting of molten cast iron because

  1. The latent heat of solidification of iron is very high
  2. The latent heat of solidification of iron is very low
  3. Cast iron decreases in volume during solidification
  4. Cast iron increases in volume during solidification

Answer: 4. Cast iron increases in volume during solidification

Question 4. The ratio of the heat required to increase the temperature of some water from 0°C to 50°C to the heat required to convert the ice of same mass into steam is

  1. 5/6
  2. 1/8
  3. 16/31
  4. 5/72

Answer: 4. 5/72

Question 5. 300 g of water at 80°C is poured on a big piece of ice at 0°C. The mass of the molten ice will be

  1. 80 g
  2. 30 g
  3. 800 g
  4. 300 g

Answer: 4. 300 g

WBCHSE Class 11 Physics Change Of State Of Matter Multiple Choice Question

Question 6. What will be the final temperature if 90 g of water at 20°C is mixed with 10 g of ice at 0°C?

  1. 20°C
  2. 2°C
  3. 10°C
  4. 18°C

Answer: 3. 18°C

Question 7. The final temperature of the mixture when 1 g of water at 100°C is mixed with 1 g ice at 0°C will be

  1. 0°C
  2. 10°C
  3. 90°C
  4. 100°C

Answer: 2. 10°C

Question 8. The final temperature of the mixture when lg of steam at 100°C be mixed with lg of ice at 0°C will be

  1. 0°C
  2. 10°C
  3. 90°C
  4. 100°C

Answer: 4. 100°C

Question 9. Freezing point of water is 0°C. If some salt is dissolved in water then freezing point of the mixture will be

  1. 0°C
  2. More than 0°C
  3. Less than 0°C
  4. 10°C

Answer: 3. 10°C

Question 10. More time is required to cook food at Darjeeling, because

  1. Atmospheric temperature is less there
  2. Humidity of atmospheric is less there
  3. Atmospheric pressure is less there
  4. Atmospheric pressure is more there

Answer: 3. Atmospheric pressure is more there

Question 11. The relation between melting point and freezing point of a noncrystalline substance is

  1. Both the temperature are equal
  2. Melting point > freezing point
  3. Melting point < freezing point
  4. Melting point may be higher or lower than its freezing point depending on the nature of the substance

Answer: 2. Melting point > freezing point

Question 12. To construct an electrical fuse,

  1. An alloy is used because its melting point is higher
  2. An alloy is used because its melting point is lower
  3. An alloy is never used because its melting point is lower
  4. An alloy is never used as its melting point is higher

Answer: 2. An alloy is used because its melting point is lower

Question 13. Melting point of ice, due to increase in pressure on it,

  1. Decreases, because excess pressure helps melting
  2. Increases, because excess pressure helps melting
  3. Decreases, because excess pressure opposes melting
  4. Increases, because excess pressure opposes melting

Answer: 1. Decreases, because excess pressure helps melting

Question 14. The rate of melting of the lower surface of an iceberg is more than its upper surface because

  1. The surrounding temperature of the lower surface is higher
  2. The amount of impurities at the lower surface is greater
  3. More pressure acts on the lower surface so that melting point of ice decreases there
  4. The structure of ice at the upper surface is different

Answer: 3. More pressure acts on the lower surface so that melting point of ice decreases there

Question 15. The ice line is the curve which shows the variation of melting point of ice with pressure. This graph

  1. Has a positive gradient
  2. Has a negative gradient
  3. Is parallel to the pressure axis
  4. Is parallel to the temperature axis

Answer: 2. Has a negative gradient

In this type of questions more than one options are correct

Question 16. With increase in pressure on a substance

  1. Boiling point may be elevated
  2. Boiling point may be depressed
  3. Melting point may be elevated
  4. Melting point may be depressed

Answer:

1. Boiling point may be elevated

3. Melting point may be elevated

4. Melting point may be depressed

Question 17. We can get vapour state of a substance through the process of

  1. Boiling
  2. Evaporation
  3. Sublimation
  4. Regelation

Answer:

  1. Boiling
  2. Evaporation
  3. Sublimation

Question 18. When m g of water at 10°C is mixed with m g of ice at 0°C, which of the following statements are false?

  1. The temperature of the system will be given by the equation
    m x 80 + m x 1 x (T-0) = m x 1 x (10 – T)
  2. Whole of ice will melt and temperature will be more than 0°C but lesser than 10°C
  3. Whole of ice will melt and the temperature will be 0°C
  4. Whole of ice will not melt and temperature will be 0°C

Answer:

  1. The temperature of the system will be given by the equation
    m x 80 + m x 1 x (T-0) = m x 1 x (10 – T)
  2. Whole of ice will melt and temperature will be more than 0°C but lesser than 10°C
  3. Whole of ice will melt and the temperature will be 0°C

Question 19. Which of the following statements are true?

  1. Water in a test tube can be made to boil by placing it in a bath of boiling water
  2. Heat cannot be stored in a body
  3. With increase in pressure melting point decreases
  4. Vapour can be directly converted into solid

Answer:

2. Heat cannot be stored in a body

4. Vapour can be directly converted into solid

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