Heat Online Test 8th Science Lesson 9 Questions in English

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Heat Online Test 8th Science Lesson 9 Questions in English

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Question 1 of 49

1. Question
1. Which among the following is not the important changes that we can see in our daily life due to heat energy as it supplied to substance?
- a) Expansion
- b) Change in atomic form
- c) Change in state
- d) Increase in temperature
Correct

Explanation

When heat energy is supplied to any substance, it brings about many changes. There are three important changes that we can see in our daily life. They are: 1. Expansion 2. Increase in temperature and 3. Change in state.

Incorrect

Explanation

When heat energy is supplied to any substance, it brings about many changes. There are three important changes that we can see in our daily life. They are: 1. Expansion 2. Increase in temperature and 3. Change in state.
Question 2 of 49

2. Question
2. Which among the following statement is correct

1) All the substances in our surrounding are made up of atoms and molecules. These atoms and molecules are always at static position. These static substances have an energy known as heat energy. This energy flows from cold substances to hot substances or from cold region to hot region of a substance.

2) When heat energy is supplied to any substance it increases the energy of the atoms and molecules in it and so they start to vibrate. These atoms and molecules which vibrate make other atoms and molecules to vibrate. Thus, heat energy is transferred from one part of the substance to other part. We can see this heat energy transfer in our daily life also. Heat energy brings about lot of changes.
- a) Only 1
- b) Only 2
- c) Both 1 and 2
- d) None
Correct

Explanation

All the substances in our surrounding are made up of atoms and molecules. These atoms and molecules are always at vibratory motion. Due to this motion substances have an energy known as heat energy. This energy flows from hot substances to cold substances or from hot region to cold region of a substance.

Incorrect

Explanation

All the substances in our surrounding are made up of atoms and molecules. These atoms and molecules are always at vibratory motion. Due to this motion substances have an energy known as heat energy. This energy flows from hot substances to cold substances or from hot region to cold region of a substance.
Question 3 of 49

3. Question
3. When the water is heated, water molecules receive heat energy. This heat energy supplied increases which of the molecules?
- a) Gravitational energy
- b) Potential energy
- c) Kinetic energy
- d) Frictional energy
Correct

Explanation

When the water is heated, water molecules receive heat energy. This heat energy supplied increases the kinetic energy of the molecules. When the molecules receive more energy, the temperature of the water increases. This shows that heat energy causes increase in temperature.

Incorrect

Explanation

When the water is heated, water molecules receive heat energy. This heat energy supplied increases the kinetic energy of the molecules. When the molecules receive more energy, the temperature of the water increases. This shows that heat energy causes increase in temperature.
Question 4 of 49

4. Question
4. In ice cubes the force of attraction between the water molecules is ___
- a) More
- b) Less
- c) Nil
- d) None of the above
Correct

Explanation

In ice cubes the force of attraction between the water molecules is more. So, they are close together. When we heat them the force of attraction between the molecules decreases and the ice cubes become water.

Incorrect

Explanation

In ice cubes the force of attraction between the water molecules is more. So, they are close together. When we heat them the force of attraction between the molecules decreases and the ice cubes become water.
Question 5 of 49

5. Question
5. Which among the following is incorrect regarding the Expansion effect of heat

1) Take a metal ball and a metal ring of suitable diameter. Pass the metal ball through the ring. You can observe that the metal ball can easily go through it. Now heat the metal ball and then try to pass it through the ring. It will not pass through the ring. Keep the metal ball on the ring for some time. In few minutes, it will fall through the ring

2) When the ball is heated the atoms in the ball gain heat energy. They start vibrating and force each other apart. As a result, an expansion takes place. That’s why the ball did not go through the ring.

3) After some time, as the ball lost the heat energy to the surrounding it came back to its original size and it went through the ring. This shows that heat energy causes expansion and contraction in solids. This expansion takes place only in solid not in liquids and gases also. It is very rare in gases.
- a) Both 1 and 2
- b) Both 1 and 3
- c) Both 2 and 3
- d) All 1, 2 and 3
Correct

Explanation

After some time, as the ball lost the heat energy to the surrounding it came back to its original size and it went through the ring. This shows that heat energy causes expansion in solids. This expansion takes place in liquids and gases also. It is maximum in gases.

Incorrect

Explanation

After some time, as the ball lost the heat energy to the surrounding it came back to its original size and it went through the ring. This shows that heat energy causes expansion in solids. This expansion takes place in liquids and gases also. It is maximum in gases.
Question 6 of 49

6. Question
6. Which among the following statement is correct

1) When we heat the water, the force of attraction decreases further. Hence they move away from one another and become vapour. Since water vapour escape to the surrounding, water level decreases further. From this we understand that heat energy causes change in the state of the substances.

2) When heat energy is removed, changes take place in reverse direction. If heat energy is supplied to or taken out from a substance, it will undergo a change from one state of matter to another. There are six transformations may take place due to heat energy.
- a) Only 1
- b) Only 2
- c) Both 1 and 2
- d) None
Correct

Incorrect
Question 7 of 49

7. Question
7. The solid to gas transformation is known as ____
- a) Vaporisation
- b) Condensation
- c) Deposition
- d) Sublimation
Correct

Explanation

The solid to gaseous transformation is known as Sublimation.

Incorrect

Explanation

The solid to gaseous transformation is known as Sublimation.
Question 8 of 49

8. Question
8. The transformation of gas to sloid state is known as ____
- a) Vaporisation
- b) Condensation
- c) Deposition
- d) Freezing
Correct

Explanation

The transformation of gas to solid state is known as Deposition.

Incorrect

Explanation

The transformation of gas to solid state is known as Deposition.
Question 9 of 49

9. Question
9. The transformation of solid to liquid state is called as _____
- a) Condensation
- b) Freezing
- c) Melting
- d) Vaporisation
Correct

Explanation

The transformation of solid to liquid state is called as Melting.

Incorrect

Explanation

The transformation of solid to liquid state is called as Melting.
Question 10 of 49

10. Question
10. The Transformation of gas to liquid state is known as ____
- a) Vaporisation
- b) Condensation
- c) Deposition
- d) Melting
Correct

Explanation

The transformation of gas to liquid state is known as condensation.

Incorrect

Explanation

The transformation of gas to liquid state is known as condensation.
Question 11 of 49

11. Question
11. Which among the following is not transformation take place due to heat energy
- a) Vaporisation
- b) Freezing
- c) Condensation
- d) Conservation
Correct

Explanation

The transformations may take place due to heat energy. 1. Solid to Liquid (Melting) 2. Liquid to Gas (Vaporisation) 3. Solid to Gas (Sublimation) 4. Gas to Liquid (Condensation) 5. Liquid to Solid (Freezing) 6. Gas to Solid (Deposition).

Incorrect

Explanation

The transformations may take place due to heat energy. 1. Solid to Liquid (Melting) 2. Liquid to Gas (Vaporisation) 3. Solid to Gas (Sublimation) 4. Gas to Liquid (Condensation) 5. Liquid to Solid (Freezing) 6. Gas to Solid (Deposition).
Question 12 of 49

12. Question
12. Heat does not transfer by which among the following way?
- a) Conduction
- b) Compression
- c) Convection
- d) Radiation
Correct

Explanation

If heat energy is supplied to any substance, it will be transferred from one part of the substance to another part. It takes place in different ways depending on the state of the substance. Three ways of heat transfer are: 1. Conduction 2. Convection and 3. Radiation.

Incorrect

Explanation

If heat energy is supplied to any substance, it will be transferred from one part of the substance to another part. It takes place in different ways depending on the state of the substance. Three ways of heat transfer are: 1. Conduction 2. Convection and 3. Radiation.
Question 13 of 49

13. Question
13. Which among the following statement is correct

1) Leave the spoon inside the hot water for some time. The other end of the spoon become hot. It is because heat in the hot water is transferred from one end to another end of the spoon.

2) In solid substances such as silver spoon, atoms are loosely arranged. Hot water molecules which are vibrating transfer the heat energy to the atoms in the spoon and make them vibrate. Those atoms make other atoms to vibrate and thus heat is transferred to the centre of the spoon.

3) In conduction heat transfer takes place between two ends of the same solid or through two solid substances that are at different temperatures but in contact with one another. Thus, we can define conduction as the process of heat transfer in solids from the region of higher temperature to the region of lower temperature without the actual movement of atoms or molecules.
- a) Both 1 and 2
- b) Both 1 and 3
- c) Both 2 and 3
- d) All 1, 2 and 3
Correct

Explanation

In solid substances such as silver spoon, atoms are arranged very closely. Hot water molecules which are vibrating transfer the heat energy to the atoms in the spoon and make them vibrate. Those atoms make other atoms to vibrate and thus heat is transferred to the other end of the spoon.

Incorrect

Explanation

In solid substances such as silver spoon, atoms are arranged very closely. Hot water molecules which are vibrating transfer the heat energy to the atoms in the spoon and make them vibrate. Those atoms make other atoms to vibrate and thus heat is transferred to the other end of the spoon.
Question 14 of 49

14. Question
14. Which is the only matter on the Earth that can be found naturally in all three states – Solid, Liquid and Gas?
- a) Lava
- b) Water
- c) Nitrogen
- d) All the above
Correct

Explanation

Water is the only matter on the Earth that can be found naturally in all three states – Solid, Liquid and Gas.

Incorrect

Explanation

Water is the only matter on the Earth that can be found naturally in all three states – Solid, Liquid and Gas.
Question 15 of 49

15. Question
15. Which among the following is the bad conductor?
- a) Rubber
- b) Cobalt
- c) Nickle
- d) Titanium
Correct

Explanation

All metals are good conductors of heat. The substances which do not conduct heat easily are called bad conductors or insulators. Wood, cork, cotton, wool, glass, rubber, etc are insulators

Incorrect

Explanation

All metals are good conductors of heat. The substances which do not conduct heat easily are called bad conductors or insulators. Wood, cork, cotton, wool, glass, rubber, etc are insulators
Question 16 of 49

16. Question
16. Which among the following is incorrect regarding conduction
- a) We cook food in vessels made up of metals. When the vessel is heated, heat is transferred from the metal to the food.
- b) When we iron dresses, heat is transferred from the iron to the cloth
- c) Handles of cooking utensils are made up of plastic or wood because they are poor conductors of heat
- d) The temperature inside igloo (snow house) is cool because snow is a good conductor of heat.
Correct

Explanation

The temperature inside igloo (snow house) is warm because snow is a poor conductor of heat.

Incorrect

Explanation

The temperature inside igloo (snow house) is warm because snow is a poor conductor of heat.
Question 17 of 49

17. Question
17. Which among the following statement is incorrect

1) When water in the vessel is heated, water molecules at the to receive heat energy and move downward. Then the molecules at the bottom comes top and get heated. This kind of heat transfer is known as convection. This is how air in the atmosphere is also heated.

2) Thus, the form of heat transfer from places of high temperature to places of low temperature by the actual movement of molecules is called convection. Convection takes place in liquids and gases.
- a) Only 1
- b) Only 2
- c) Both 1 and 2
- d) None
Correct

Explanation

When water in the vessel is heated, water molecules at the bottom receive heat energy and move upward. Then the molecules at the top comes down and get heated. This kind of heat transfer is known as convection. This is how air in the atmosphere is also heated.

Incorrect

Explanation

When water in the vessel is heated, water molecules at the bottom receive heat energy and move upward. Then the molecules at the top comes down and get heated. This kind of heat transfer is known as convection. This is how air in the atmosphere is also heated.
Question 18 of 49

18. Question
18. Which among the following statement is correct regarding convection
- a) Formation of land breeze and sea breeze is due to convection of air.
- b) Wind flows from one region to another region by convection
- c) In hot air balloons heat is transferred by convection and so the balloon raises.
- d) In refrigerators, cool air moves upward and replaces the cool air because of convection.
Correct

Explanation

In refrigerators, cool air moves downward and replaces the hot air because of convectionin.

Incorrect

Explanation

In refrigerators, cool air moves downward and replaces the hot air because of convectionin.
Question 19 of 49

19. Question
19. Which is defined as the way of heat transfer from one place to another in the form of electromagnetic waves?
- a) Convection
- b) Condensation
- c) Radiation
- d) Scattering
Correct

Explanation

Radiation is defined as the way of heat transfer from one place to another in the form of electromagnetic waves.

Incorrect

Explanation

Radiation is defined as the way of heat transfer from one place to another in the form of electromagnetic waves.
Question 20 of 49

20. Question
20. Radiation does not pass through which among the medium?
- a) Liquid
- b) Gas
- c) Vacuum
- d) None of the above
Correct

Explanation

Radiation is the third form of heat transfer. By conduction, heat is transferred through solids, by convection heat is transferred through liquids and gases, but by radiation heat can be transferred through empty space even through vacuum. Heat energy from the Sun reaches the Earth by this form of heat transfer.

Incorrect

Explanation

Radiation is the third form of heat transfer. By conduction, heat is transferred through solids, by convection heat is transferred through liquids and gases, but by radiation heat can be transferred through empty space even through vacuum. Heat energy from the Sun reaches the Earth by this form of heat transfer.
Question 21 of 49

21. Question
21. Which among the following statement is correct
- a) Heat energy from the Sun reaches the Earth by radiation.
- b) While standing near fire we feel the heat which is transferred as radiation.
- c) Black surfaces reflect heat radiation. So that the bottom of the cooking vessels is painted black
- d) All the above
Correct

Explanation

Black surfaces absorb heat radiation. So that the bottom of the cooking vessels is painted black. White colour reflects heat radiation. That’s why we are advised to wear white cloth during summer.

Incorrect

Explanation

Black surfaces absorb heat radiation. So that the bottom of the cooking vessels is painted black. White colour reflects heat radiation. That’s why we are advised to wear white cloth during summer.
Question 22 of 49

22. Question
22. When a substance is heated to what temperature the radiation begins to become visible to the eye as a dull red glow, and it is sensed as warmth by the skin?
- a) 100 C
- b) 200 C
- c) 350 C
- d) 500 C
Correct

Explanation

Heat transfer by radiation is visible to our eyes. When a substance is heated to 500°C the radiation begins to become visible to the eye as a dull red glow, and it is sensed as warmth by the skin. Further heating rapidly increases the amount of radiation, and its perceived colour becomes orange, yellow and finally white.

Incorrect

Explanation

Heat transfer by radiation is visible to our eyes. When a substance is heated to 500°C the radiation begins to become visible to the eye as a dull red glow, and it is sensed as warmth by the skin. Further heating rapidly increases the amount of radiation, and its perceived colour becomes orange, yellow and finally white.
Question 23 of 49

23. Question
23. The amount of energy in food items is measured by the unit _____
- a) Calorie
- b) Kilo Calorie
- c) Kilo Joule
- d) Joule
Correct

Explanation

The amount of energy in food items is measured by the unit kilo calorie.

1 kilo calorie = 4200 J (Approximately).

Incorrect

Explanation

The amount of energy in food items is measured by the unit kilo calorie.

1 kilo calorie = 4200 J (Approximately).
Question 24 of 49

24. Question
24. The technique used to measure the amount of heat involved in a physical or a chemical process is known as ____
- a) Calorimetry
- b) Alkalimetry
- c) Fluorometry
- d) Chronometry
Correct

Explanation

There are physical changes due to heat energy like ice transform to liquid. Similarly, heat energy produces chemical changes also. To know more about the physical and chemical changes that take place in substances, we need to measure the amount of heat involved. The technique used to measure the amount of heat involved in a physical or a chemical process is known as calorimetry.

Incorrect

Explanation

There are physical changes due to heat energy like ice transform to liquid. Similarly, heat energy produces chemical changes also. To know more about the physical and chemical changes that take place in substances, we need to measure the amount of heat involved. The technique used to measure the amount of heat involved in a physical or a chemical process is known as calorimetry.
Question 25 of 49

25. Question
25. Which is a physical quantity which expresses whether an object is hot or cold?
- a) Velocity
- b) Pressure
- c) Temperature
- d) Density
Correct

Explanation

Temperature is a physical quantity which expresses whether an object is hot or cold.

Incorrect

Explanation

Temperature is a physical quantity which expresses whether an object is hot or cold.
Question 26 of 49

26. Question
26. Temperature is measured with the help of _____
- a) Seismograph
- b) Thermometer
- c) Manometer
- d) Hygrometer
Correct

Explanation

Temperature is measured with the help of thermometer.

Incorrect

Explanation

Temperature is measured with the help of thermometer.
Question 27 of 49

27. Question
27. Which among the following is not the scale to measure the temperature?
- a) Celsius scale
- b) Fahrenheit scale
- c) Kelvin scale
- d) Fujita scale
Correct

Explanation

There are three scales to measure the temperature. They are: • Celcius scale • Fahrenheit scale • Kelvin scale.

Incorrect

Explanation

There are three scales to measure the temperature. They are: • Celcius scale • Fahrenheit scale • Kelvin scale.
Question 28 of 49

28. Question
28. The unit of energy in SI system is ____
- a) Newton
- b) Pascal
- c) Joule
- d) Watt
Correct

Explanation

We know that heat is a form of energy. The unit of energy in SI system is joule. So, heat is also measured in joule. It is expressed by the symbol J.

Incorrect

Explanation

We know that heat is a form of energy. The unit of energy in SI system is joule. So, heat is also measured in joule. It is expressed by the symbol J.
Question 29 of 49

29. Question
29. Which among the following is not the factor that determine the amount of heat energy gained or lost by a substance?
- a) Mass of the substance
- b) Change in temperature of the substance
- c) Nature of the material of the substance
- d) None of the above
Correct

Explanation

In general, the amount of heat energy gained or lost by a substance is determined by three factors. They are: • Mass of the substance • Change in temperature of the substance • Nature of the material of the substance.

Incorrect

Explanation

In general, the amount of heat energy gained or lost by a substance is determined by three factors. They are: • Mass of the substance • Change in temperature of the substance • Nature of the material of the substance.
Question 30 of 49

30. Question
30. Which is defined as the amount of heat energy required by a substance to raise its temperature by 1°C or 1 K?
- a) Heat capacity
- b) Kilo joule
- c) One calorie
- d) None of the above
Correct

Explanation

Different substances require different amount of heat energy to reach a particular temperature. This nature is known as heat capacity of a substance. Heat capacity is defined as the amount of heat energy required by a substance to raise its temperature by 1°C or 1 K. It is denoted by the symbol C’.

Incorrect

Explanation

Different substances require different amount of heat energy to reach a particular temperature. This nature is known as heat capacity of a substance. Heat capacity is defined as the amount of heat energy required by a substance to raise its temperature by 1°C or 1 K. It is denoted by the symbol C’.
Question 31 of 49

31. Question
31. Which among the following is the correct formula of ; Heat capacity = ?
- a) Raise in temperature (ΔT) / Amount of heat energy required (Q)
- b) Amount of heat energy required (Q) / Raise in temperature (ΔT)
- c) Amount of heat energy required (Q) × Raise in temperature (ΔT)
- d) Raise in temperature (ΔT) + Amount of heat energy required (Q)
Correct

Explanation

Heat capacity = Amount of heat energy required (Q) / Raise in temperature (ΔT).

Incorrect

Explanation

Heat capacity = Amount of heat energy required (Q) / Raise in temperature (ΔT).
Question 32 of 49

32. Question
32. In the SI system, heat capacity is measures in ____
- a)
- b)
- c)
- d)
Correct

Explanation

The unit of heat capacity is Cal / °C. In SI system, it is measured in JK-1

.

Incorrect

Explanation

The unit of heat capacity is Cal / °C. In SI system, it is measured in JK-1

.
Question 33 of 49

33. Question
33. The temperature of a metal ball is 30°C. When an energy of 3000 J is supplied, its temperature raises by 40°C. Calculate its heat capacity?
- a) 90000 KJ-1
- b) 100 KJ-1
- c) 300 KJ-1
- d) 500 KJ-1
Correct

Explanation

Heat capacity, C’ = Q / ΔT

Here, Q = 3000 J

ΔT = 40°C – 30°C = 10°C = 10 K

C’ = 3000 / 100 = 300 JK^-1

The heat capacity of the metal ball is 300 JK^-1

Incorrect

Explanation

Heat capacity, C’ = Q / ΔT

Here, Q = 3000 J

ΔT = 40°C – 30°C = 10°C = 10 K

C’ = 3000 / 100 = 300 JK^-1

The heat capacity of the metal ball is 300 JK^-1
Question 34 of 49

34. Question
34. Which is the amount of heat energy required to raise the temperature of 1 gram of water through 1°C?
- a) One Newton
- b) One calorie
- c) Specific heat capacity
- d) Heat capacity
Correct

Explanation

The most commonly used unit of heat is calorie. One calorie is the amount of heat energy required to raise the temperature of 1 gram of water through 1°C.

Incorrect

Explanation

The most commonly used unit of heat is calorie. One calorie is the amount of heat energy required to raise the temperature of 1 gram of water through 1°C.
Question 35 of 49

35. Question
35. The energy required to raise the temperature of an iron ball by 1 K is 500 JK^-1. Calculate the amount of energy required to raise its temperature by 20 K?
- a) 10000 J
- b) 250 J
- c) 1000 J
- d) 480 J
Correct

Explanation

Heat capacity, C’ = Q / ΔT

Q = C’ × ΔT

Here, C’ = 500 JK^-1

ΔT = 20 K

Q = 500 × 20 = 10000 J.

The amount of heat energy required is 10000 J.

Incorrect

Explanation

Heat capacity, C’ = Q / ΔT

Q = C’ × ΔT

Here, C’ = 500 JK^-1

ΔT = 20 K

Q = 500 × 20 = 10000 J.

The amount of heat energy required is 10000 J.
Question 36 of 49

36. Question
36. Which is defined as the amount of heat energy required to raise the temperature of 1 kilogram of a substance by 1°C or 1 K?
- a) Heat capacity
- b) One calorie
- c) Specific heat capacity
- d) Joule capacity
Correct

Explanation

When the heat capacity of a substance is expressed for unit mass, it is called specific heat capacity. Specific heat capacity of a substance is defined as the amount of heat energy required to raise the temperature of 1 kilogram of a substance by 1°C or 1 K. It is denoted by the symbol C.

Incorrect

Explanation

When the heat capacity of a substance is expressed for unit mass, it is called specific heat capacity. Specific heat capacity of a substance is defined as the amount of heat energy required to raise the temperature of 1 kilogram of a substance by 1°C or 1 K. It is denoted by the symbol C.
Question 37 of 49

37. Question
37. Which among the following is the correct equation for Specific heat capacity =?
- a) Amount of heat energy required (Q) × Mass × Raise in temperature (ΔT)
- b) (Amount of heat energy required (Q) × Mass) / Raise in temperature (ΔT)
- c) Amount of heat energy required (Q) / (Mass × Raise in temperature (ΔT))
- d) (Amount of heat energy required (Q) + Mass) / Raise in temperature (ΔT)
Correct

Incorrect
Question 38 of 49

38. Question
- a)
- b)
- c)
- d)
Correct

Explanation

The SI unit of specific heat capacity is J Kg^-1 K^-1.

Incorrect

Explanation

The SI unit of specific heat capacity is J Kg^-1 K^-1.
Question 39 of 49

39. Question
- a)
- b)
- c)
- d)
Correct

Explanation

Specific heat capacity, C = Q / m × ΔT

Here, Q = 84000 J

m = 2 kg

ΔT = 70°C – 60°C = 10°C = 10 K

C = 84000 / 2 × 10 = 4200 J Kg^-1 K^-1

The Specific heat capacity of water is 4200 J Kg^-1 K^-1.

Incorrect

Explanation

Specific heat capacity, C = Q / m × ΔT

Here, Q = 84000 J

m = 2 kg

ΔT = 70°C – 60°C = 10°C = 10 K

C = 84000 / 2 × 10 = 4200 J Kg^-1 K^-1

The Specific heat capacity of water is 4200 J Kg^-1 K^-1.
Question 40 of 49

40. Question
40. Which is the most commonly used scale to measure Temperature?
- a) Celsius scale
- b) Fahrenheit scale
- c) Kelvin scale
- d) All the above
Correct

Explanation

Kelvin scale is the most commonly used one.

Incorrect

Explanation

Kelvin scale is the most commonly used one.
Question 41 of 49

41. Question
41. The specific heat capacity of a metal is 160 JKg^-1 K^-1 . Calculate the amount of heat energy required to raise the temperature of 500 gram of the metal from 125°C to 325°C?
- a) 8000 J
- b) 32000 J
- c) 12000 J
- d) 16000 J
Correct

Explanation

Specific heat capacity, C = Q / m × ΔT

Q = C × m × ΔT

Here, C = 160 J Kg K^-1

^m = 500 g = 0.5 kg

ΔT = 325°C – 125°C = 200°C = 200 K

Q = 160 × 0.5 × 200 = 16000 J.

The amount of heat energy required is 16000 J

Incorrect

Explanation

Specific heat capacity, C = Q / m × ΔT

Q = C × m × ΔT

Here, C = 160 J Kg K^-1

^m = 500 g = 0.5 kg

ΔT = 325°C – 125°C = 200°C = 200 K

Q = 160 × 0.5 × 200 = 16000 J.

The amount of heat energy required is 16000 J
Question 42 of 49

42. Question
42. Which is a device used to measure the amount of heat gained or lost by a substance that consists of a vessel made up of metals like copper or aluminium which are good conductors of heat and electricity?
- a) Thermometer
- b) Calorimeter
- c) Seismometer
- d) Thermostat
Correct

Explanation

A calorimeter is a device used to measure the amount of heat gained or lost by a substance. It consists of a vessel made up of metals like copper or aluminium which are good conductors of heat and electricity.

Incorrect

Explanation

A calorimeter is a device used to measure the amount of heat gained or lost by a substance. It consists of a vessel made up of metals like copper or aluminium which are good conductors of heat and electricity.
Question 43 of 49

43. Question
43. Which among the following statement is correct regarding calorimeter

1) The metallic vessel is kept in an insulating jacket to prevent heat loss to the environment. There are two holes in it. Through one hole a thermometer is inserted to measure the temperature of the contents.

2) A stirrer is inserted through another hole for stirring the content in the vessel. The vessel is filled with liquid which is heated by passing current through the heating element. Using this device, we can measure the heat capacity of the liquid in the container.
- a) Only 1
- b) Only 2
- c) Both 1 and 2
- d) None
Correct

Explanation

Incorrect

Explanation
Question 44 of 49

44. Question
44. Which is a device which maintains the temperature of a place or an object constant?
- a) Thermometer
- b) Thermostat
- c) Thermo flask
- d) Hydrostat
Correct

Explanation

A thermostat is a device which maintains the temperature of a place or an object constant. The word thermostat is derived from two Greek words, ‘thermo’ meaning heat and ‘static’ meaning staying the same.

Incorrect

Explanation

A thermostat is a device which maintains the temperature of a place or an object constant. The word thermostat is derived from two Greek words, ‘thermo’ meaning heat and ‘static’ meaning staying the same.
Question 45 of 49

45. Question
45. The world’s first ice-calorimeter was used in the year 1782 by whom?
- a) Joseph Fourier and Antoine Lavoisier
- b) Simeon Denis Poisson and Leonhard Euler
- c) Leonhard Euler and Joseph Fourier
- d) Antoine Lavoisier and Pierre Simon Laplace
Correct

Explanation

The world’s first ice-calorimeter was used in the year 1782 by Antoine Lavoisier and Pierre Simon Laplace, to determine the heat generated by various chemical changes.

Incorrect

Explanation

The world’s first ice-calorimeter was used in the year 1782 by Antoine Lavoisier and Pierre Simon Laplace, to determine the heat generated by various chemical changes.
Question 46 of 49

46. Question
46. Which among the following statement is correct regarding thermostat?

1) Thermostats are used in any device or system that gets heated or cools down to a pre-set temperature. It turns an appliance or a circuit on or off when a particular temperature is reached.

2) Devices which use thermostat include building heater, central heater in a room, air conditioner, water heater, as well as kitchen equipment’s including oven and refrigerators. Thermostat functions as the sensor of a thermal system not as a controller
- a) Only 1
- b) Only 2
- c) Both 1 and 2
- d) None
Correct

Explanation

Devices which use thermostat include building heater, central heater in a room, air conditioner, water heater, as well as kitchen equipments including oven and refrigerators. Sometimes, a thermostat functions both as the sensor and the controller of a thermal system.

Incorrect

Explanation

Devices which use thermostat include building heater, central heater in a room, air conditioner, water heater, as well as kitchen equipments including oven and refrigerators. Sometimes, a thermostat functions both as the sensor and the controller of a thermal system.
Question 47 of 49

47. Question
47. The Thermo Flask is also known as ____
- a) Flour flask
- b) Solid flask
- c) Vacuum flask
- d) Fourier flask
Correct

Explanation

The thermos flask (Vacuum flask) is an insulating storage vessel that keeps its content hotter or cooler than the surroundings for a longer time. It is primarily meant to enhance the storage period of a liquid by maintaining a uniform temperature and avoiding possibilities of getting a bad taste.

Incorrect

Explanation

The thermos flask (Vacuum flask) is an insulating storage vessel that keeps its content hotter or cooler than the surroundings for a longer time. It is primarily meant to enhance the storage period of a liquid by maintaining a uniform temperature and avoiding possibilities of getting a bad taste.
Question 48 of 49

48. Question
48. Which among the following statement is correct regarding Working of Thermos flask?

1) A thermos flask has triple walls, which are evacuated. It is copper on the inside. The vacuum between the three walls prevents heat being transferred from the inside to the outside by conduction and convection.

2) With very little air between the walls, there is almost no transfer of heat from the inner wall to the outer wall or vice versa. Conduction can only occur at the points where the two walls meet, at the top of the bottle and through an insulated support at the bottom. The silvered walls reflect radiated heat back to the liquid in the bottle.
- a) Only 1
- b) Only 2
- c) Both 1 and 2
- d) None
Correct

Explanation

A thermos flask has double walls, which are evacuated. It is silvered on the inside. The vacuum between the two walls prevents heat being transferred from the inside to the outside by conduction and convection.

Incorrect

Explanation

A thermos flask has double walls, which are evacuated. It is silvered on the inside. The vacuum between the two walls prevents heat being transferred from the inside to the outside by conduction and convection.
Question 49 of 49

49. Question
49. Which Scottish scientist invented Vacuum flask in 1892?
- a) Antoine Lavoisier
- b) Sir Thomas Bayes
- c) Frank Whittle
- d) Sir James Dewar
Correct

Explanation

The vacuum flask was invented by Scottish scientist Sir James Dewar in 1892. In his honour it is called Dewar flask. It’s also known as Dewar bottle.

Incorrect

Explanation

The vacuum flask was invented by Scottish scientist Sir James Dewar in 1892. In his honour it is called Dewar flask. It’s also known as Dewar bottle.

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