Class 11 Physics

MPBSE Class 11 Physics Chapter 12 Thermal Expansion Multiple Choice Question And Answers

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Calorimetry And Thermal Expansion Multiple Choice Question And Answers

Question 1. The amount of heat required to change the state of 1 kg of substance at constant temperature is called

  1. Kilocal
  2. Calorie
  3. Specific heat
  4. Latent heat

Answer: 4. latent heat

Question 2. The water equivalent of a 400 g copper calorimeter (specific heat = 0.1 cal/gºC)

  1. 40 g
  2. 4000 g
  3. 200 g
  4. 4 g

Answer: 1. 40 g

Question 3. Heat required to convert 1 g of ice at 0ºC into steam at 100ºC is

  1. 100 cal
  2. 0.01 cal/ºC
  3. 720 cal
  4. 1 kilocal

Answer: 3. 720 cal

Question 4. The thermal capacity of 40 g of aluminum (specific heat = 0.2 cal/gmºC)

  1. 40 cal/ºC
  2. 160 cal/ºC
  3. 200 cal/ºC
  4. 8 cal/ºC

Answer: 5. 8 cal/ºC

Class 11 Physics Thermal Expansion MCQs Question 5. The boiling water is changing into steam. Under this condition, the specific heat of water is

  1. Zero
  2. One
  3. Infinite
  4. Less than one

Answer: 3. Infinite

Question 6. One kg of ice at 0ºC is mixed with 1 kg of water at 10ºC. The resulting temperature will be

  1. Between 0ºC and 10ºC
  2. 0ºC
  3. Less than 0ºC
  4. Greater than 0ºC

Answer: 2. 0ºC

Question 7. If 10g of ice at 0ºC is mixed with 10g of water at 40ºC, the final mass of water in the mixture is

  1. 10 g
  2. 15 g
  3. 18 g
  4. 20 g

Answer: 2. 15 g

Question 8. Water is used to cool the radiators of engines in cars because:

  1. Of its low boiling point
  2. Of its high specific heat
  3. Of its low-density
  4. Of its easy availability

Answer: 2. Of its high specific heat

Question 9. Steam at 100ºC is passed into 2.0 kg of water contained in a calorimeter of water equivalent to 0.02 kg at 15ºC till the temperature of the calorimeter and its contents rise to 90ºC. The mass of steam condensed in kg is

  1. 0.301
  2. 0.280
  3. 0.60
  4. 0.02

Answer: 2. 0.280

Class 11 Physics Thermal Expansion MCQs Question 10. A small quantity, mass m, of water at a temperature θ (inºC) is poured onto a large mass M of ice which is at its melting point. Ιf c is the specific heat capacity of water and L is the latent heat of fusion of ice, then the mass of ice melted is given by :

  1. \(\frac{\mathrm{ML}}{\mathrm{mc} \theta}\)
  2. \(\frac{\mathrm{mc} \theta}{\mathrm{ML}}\)
  3. \(\frac{\mathrm{Mc} \theta}{\mathrm{L}}\)
  4. \(\frac{\mathrm{mc} \theta}{\mathrm{L}}\)

Answer: 4. \(\frac{\mathrm{mc} \theta}{\mathrm{L}}\)

Question 11. 20 gm ice at –10 ºC is mixed with m gm steam at 100 ºC. Minimum value of m so that finally all ice and steam converts into water. (Use sice=0.5 cal/gmºC, swater=1 cal/gmºC,L (melting)=80 cal/gm and L (vaporization) = 540 cal/gm)

  1. \(\frac{85}{32} \mathrm{gm}\)
  2. \(\frac{85}{64} \mathrm{gm}\)
  3. \(\frac{32}{85} \mathrm{gm}\)
  4. \(\frac{64}{85} \mathrm{gm}\)

Answer: 1. \(\frac{85}{32} \mathrm{gm}\)

Question 12. 300 calories of heat is supplied to raise the temperature of 50 gm of air from 20°C to 30°C without any change in its volume. Change in internal energy per gram of air is

  1. Zero
  2. 0.6 calories
  3. 1.2 calories
  4. 6.0 calories

Answer: 4. 6.0 calories

Question 13. How much heat energy is gained when 5 kg of water at 20°C is brought to its boiling point? (Specific heat of water = 4.2 kg-1C-1)

  1. 1680 kJ
  2. 1700 kJ
  3. 1720 kJ
  4. 1740 kJ

Answer: 1. 1680 kJ

Question 14. Two rigid boxes containing different ideal gases are placed on a table. Box A contains one mole of nitrogen at temperature T0, While Box B contains one mole of helium at temperature (7/3) T0. The boxes are then put into thermal contact with each other and heat flows between them until the gases reach a common final temperature (ignore the heat capacity of boxes). Then, the final temperature of the gases, Tf, in terms of T0 is

  1. \(\mathrm{T}_{\mathrm{f}}=\frac{7}{3} \mathrm{~T}_0\)
  2. \(T_f=\frac{3}{2} T_0\)
  3. \(T_f=\frac{5}{2} T_0\)
  4. \(T_f=\frac{3}{7} T_0\)

Answer: 2. \(T_f=\frac{3}{2} T_0\)

Class 11 Physics Thermal Expansion MCQs Question 15. Compared to a burn due to water at 100°C, a burn due to stem at 100°C is

  1. More dangerous
  2. Less dangerous
  3. Equally dangerous
  4. None of these

Answer: 1. More Dangerous

Question 16. Their moment should have its heat capacity small. If P is mercury thermometer, Q is resistance thermometer and R is thermocouple type then

  1. P is best, R worst
  2. R is best, P worst
  3. R is best, Q worst
  4. P is best, Q worst

Answer: 3. R is best, Q worst

Question 17. If 1g of steam is mixed with 1 g of ice, then the resultant temperature of the mixture is :

  1. 270°C
  2. 230°C
  3. 100°C
  4. 50°C

Answer: 3. 100°C

Question 18. The amount of heat required to convert a gram of ice at 0ºC into steam at 100ºC will be –

  1. 716 cal
  2. 500 cal
  3. 180 cal
  4. 100 cal

Answer: 1. 716 cal

Question 19. 10 grams of ice at 0ºC is mixed with 10 grams of water at 20ºC. The final temperature of the mixture will be

  1. 50ºC
  2. 10ºC
  3. 0ºC
  4. 15ºC

Answer: 3. 0ºC

Class 11 Physics Thermal Expansion MCQs  Question 20. The amount of heat required to change 1 gm (0ºC) of ice into water of 100°C, is :

  1. 716 cal
  2. 500 cal
  3. 180 cal
  4. 100 cal

Answer: 3. 180 cal

Question 21. The latent heat of steam is 536 cal/gm, then its value in joule/kg is:

  1. 2.25 × 106
  2. 2.25 × 103
  3. 2.25
  4. None of these

Answer: 1. 2.25 × 106

Question 22. At 100ºC, the substance that causes the most severe burn is –

  1. Oil
  2. Steam
  3. Water
  4. Hot air

Answer: 2. Steam

Question 23. The SI unit of the mechanical equivalent of heat is –

  1. Joule × calorie
  2. Joule/calorie
  3. Calorie×erg
  4. Erg/calorie

Answer: 2. Joule/calorie

Question 24. Volume expansion coefficient of a gas at constant pressure equal to:

  1. Temperature
  2. Proportional to square root of temperature
  3. Inversely proportional to the square root of temperature
  4. Inversely proportional to temperature

Answer: 4. Inversely proportional to temperature

Question 25. 50 gm ice at 0ºC in an insulator vessel, 50 g water of 100ºC is mixed in it, then the final temperature of the mixture is (neglecting the heat loss) :

  1. 10ºC
  2. 0º << Tm< 20ºC
  3. 20ºC
  4. Above 20ºC

Answer: 1. 10ºC

Class 11 Physics Thermal Expansion MCQs Question 26. A bottle is filled with water at 30ºC. When it is taken on the moon then :

  1. Water will freeze
  2. Water will boil
  3. Water will decompose in hydrogen and oxygen
  4. Nothing will happen to the water

Answer: 4. Nothing will happen to the water

Question 27. Work done in converting one gram of ice at –10ºC into steam at 100ºC is –

  1. 3045 J
  2. 6056 J
  3. 721 J
  4. 616 J

Answer: 1. 3045 J

Question 28. The ratio of radii of two spheres of the same material is 1: 4, then the ratio of their heat capacities is

  1. \(\frac{1}{4}\)
  2. \(\frac{1}{16}\)
  3. \(\frac{1}{32}\)
  4. \(\frac{1}{64}\)

Answer: 4. \(\frac{1}{64}\)

Question 29. Heat given to a body which raises its temperature by 1°C is :

  1. Water equivalent
  2. Thermal capacity
  3. Specific heat
  4. Temperature gradient 32453351

Answer: 2. Thermal capacity

Question 30. If mass-energy equivalence is taken into account, when water is cooled to form ice, in an isolated system the mass of water should:

  1. Increase
  2. Remain unchanged
  3. Decrease
  4. First increase then decrease

Answer: 1. Increase