1 The principle of conservation of heat energy
states that
that when an object is at constant
temperature or is in thermal equilibrium, it is
losing and gaining heat at equal rates.
the heat lost by a hot body is equal to the
heat gained by the cold body in any system
provided there is no heat exchange between the
substances involved and their surrounding
It is defined as the process in which
molecules move from area of high concentration
to another area of low concentration until an
equilibrium concentration is established within the
system under consideration
2 Which of the following statements is always
true for a reaction in which there is no non-
expansion work?
All of the above
None of the above
3 If the specific heat capacity of water initially is
per kg per K and
, the difference in temperature of water between
the top and bottom of a 210 m high water fall is
----------
4 The latent heat of fusion of pure water is
. How much energy would it take to melt 3 kg of
ice at
to water at
111 kJ
334 kJ
668 kJ
1 000 kJ
5 Which of the following is NOT true?
evaporation occurs at any temperature of a
liquid
boiling takes place only at the surface of the
liquid
evaporation occurs only at the surface of a
liquid
boiling of a liquid takes place at a definite
temperature and pressure
6 Hooke’s law states that
the force applied on elastic material is
directly proportional to the acceleration produced
provided the elastic limit is not exceeded.
the force applied on elastic material is
directly proportional to the extension produced
provided the elastic limit is exceeded.
the escape thrust applied on elastic material
is directly proportional to the extension produced
provided the elastic limit is not exceeded.
the force applied on elastic material is
directly proportional to the extension produced
provided the elastic limit is not exceeded.
7 The absolute zero temperature refers to the
temperature at which
pure ice, water and water vapour at normal
atmospheric pressure are in equilibrium
theoretically all thermal motions will cease
pure ice melts at normal atmospheric
pressure
pure ice ecomes steam at atmospheric
pressure
8 Tin melts at 232 under standard atmospheric
pressure. Express this temperature in kelvin
449.16K
505.15K
60.91K
96.19K
9 An ungraduated mercury thermometer attached
to a millimeter scale reads 22.8mm in ice and
242mm in steam at standard pressure. What will
the millimeter read when the temperature is 20^
{o} C?
66.64mm
43.84mm
219.20mm
34.54mm
10 Two bodies may be said to be in thermal
equilibrium if
the bodies are thermally insulated from one
another
the bodies are not in thermal equlibrium with
another body
if one body loses heat to the other
if there not net flow of heat between the two
bodies two bodies in thermal contact
11 Heat can be defined
as------------------------
the change in temperature of a body
the flow of temperature from one body to
another
energy that flows from place to place as a
result of the difference in temperature between
them
the measure of hotness or coolness of a body
12 Thermal expansion of a solid material depends
on the following EXCEPT
the nature of the material making up the solid
the range of the temperature change
the initial dimensions of the solid
average translational motion of constituent
atoms of the material
13 Calculate the work done against external
atmospheric pressure when 1 g of water changes
to
of steam. Take the atmospheric pressure as
169.3 J
342.4 J
226.2 J
143.5 J
14 The statement "Heat lost by hot object is
equal to heat gained by cold object" another way
of expressing the law of conservation of
---------------------
charge
angular momentum
energy
momentum
15 Which of the following does NOT determine the
amount of internal energy an object has?
temperature
amount of material
type of material
shape of the object
16 Calculate the work done against external
atmospheric pressure when 1 g of water changes
to
of steam. Take the atmospheric pressure as
169.3 J
342.4 J
226.2 J
143.5 J
17 Calculate the change in internal energy of 2kg
of water at 90 degree celcius when it is changed
to 3 30 m of steam at 100 C. The whole
process occurs at atmospheric pressure. The
latent heat of vaporization of water is
2 26 0 J/kg.
4.27 MJ
3.43 kJ
45.72 mJ
543.63 J
18 Tensile strain is mathematically expressed as:
Force/Area
initial length/extension
extension/initial lenght
Stress + initial lenght
19 A certain resistance thermometer at triple
point of water has resistance of
. What is the temperature of the system in
degrees celcius when the resistance of the
thermometer is
?
C
C
C
C
20 The temperature at which the tungsten
filament of a 12 V and 36W lamp operates is
C. If the temperature coefficient of resistance of
tungsten is
/K, find the resistance of the lamp at a room
temperature of 20 C
To answer these questions, we need to use the relevant formulas and concepts. Here is a step-by-step guide on how to find the answers:
1. The principle of conservation of heat energy states that when an object is at constant temperature or is in thermal equilibrium, it is losing and gaining heat at equal rates.
2. In a reaction with no non-expansion work, all of the statements provided could be true.
3. To find the difference in temperature, we need to use the formula Q = mcΔT, where Q is the heat energy, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature. However, the values for c and ΔT are missing in the question, so it cannot be answered accurately.
4. To calculate the energy required to melt ice, we use the formula Q = mH, where Q is the energy, m is the mass, and H is the latent heat of fusion. Plugging in the values, we get Q = 3kg * 334 kJ = 1002 kJ. Therefore, the answer is 1,000 kJ.
5. The statement that is NOT true is "boiling takes place only at the surface of the liquid." Boiling occurs throughout the entire liquid, not just at the surface.
6. Hooke's law states that the force applied on an elastic material is directly proportional to the extension produced, provided the elastic limit is not exceeded.
7. The absolute zero temperature refers to the theoretically lowest possible temperature where all thermal motions will cease.
8. To convert the temperature from Celsius to Kelvin, we add 273.15 to the given value. Hence, 232°C + 273.15 = 505.15K.
9. To find the millimeter reading on the thermometer, we use the formula (highest value - lowest value) * (20°C - ice temperature) / (steam temperature - ice temperature) + lowest value. Plugging in the values, we get (242mm - 22.8mm) * (20°C - 0°C) / (100°C - 0°C) + 22.8mm = 219.20mm.
10. Two bodies may be said to be in thermal equilibrium if there is no net flow of heat between them, or if they are at the same temperature.
11. Heat can be defined as energy that flows from place to place as a result of the difference in temperature between them.
12. The thermal expansion of a solid material depends on the range of temperature change, the initial dimensions of the solid, and the average translational motion of constituent atoms of the material. It does not depend on the nature of the material making up the solid.
13. To calculate the work done against external atmospheric pressure, we use the formula W = PΔV. Given the atmospheric pressure and the values for mass and latent heat of vaporization, we can calculate the volume change and then find the work done.
14. The statement "Heat lost by hot object is equal to heat gained by cold object" is another way of expressing the law of conservation of energy.
15. The amount of internal energy an object has is determined by the amount of material, the type of material, and the shape of the object. Temperature does not directly determine the amount of internal energy.
16. This question is a duplicate of question 13, and the answer is already provided in the previous explanation.
17. To find the change in internal energy, we use the formula ΔQ = mH, where ΔQ is the change in heat energy, m is the mass, and H is the latent heat of vaporization. Plugging in the values, we get ΔQ = 2kg * 2,260,000 J/kg = 4,520,000 J. Therefore, the answer is 4.27 MJ.
18. Tensile strain is mathematically expressed as the extension divided by the initial length.
19. To find the temperature of the system in degrees Celsius, we need to use the given resistance values and the temperature coefficient of the resistance thermometer. The exact calculations cannot be done with the information provided in the question.
20. To find the resistance of the lamp at room temperature, we use the formula R = R₀ * (1 + α * (T - T₀)), where R is the resistance, R₀ is the resistance at the reference temperature T₀, α is the temperature coefficient of resistance, and T is the new temperature. Plugging in the values, we get R = 364 * (1 + 0.0045 * (20 - 20)). Therefore, the resistance of the lamp at room temperature is 364Ω.
Please note that some questions couldn't be answered accurately due to missing information or duplicate questions.
1. The principle of conservation of heat energy states that when an object is at constant temperature or is in thermal equilibrium, it is losing and gaining heat at equal rates.
2. None of the above statements is always true for a reaction in which there is no non-expansion work.
3. The difference in temperature of water between the top and bottom of a 210 m high waterfall is not provided in the question.
4. The amount of energy required to melt 3 kg of ice at -20°C to water at 0°C is 1000 kJ.
5. Boiling takes place only at the surface of the liquid is NOT true. Boiling occurs throughout the liquid.
6. Hooke's law states that the force applied on an elastic material is directly proportional to the extension produced, provided the elastic limit is not exceeded.
7. The absolute zero temperature refers to the temperature at which theoretically all thermal motions will cease.
8. Tin melts at 232°C under standard atmospheric pressure, which is equivalent to 505.15K.
9. An ungraduated mercury thermometer attached to a millimeter scale would read 66.64mm when the temperature is 20°C.
10. Two bodies may be said to be in thermal equilibrium if there is no net flow of heat between the two bodies in thermal contact.
11. Heat can be defined as the energy that flows from place to place as a result of the difference in temperature between them.
12. The average translational motion of constituent atoms of the material does not determine the thermal expansion of a solid material.
13. The work done against external atmospheric pressure when 1g of water changes to 1g of steam is 226.2J.
14. The statement "Heat lost by a hot object is equal to heat gained by a cold object" is another way of expressing the law of conservation of energy.
15. The shape of the object does not determine the amount of internal energy an object has.
16. The work done against external atmospheric pressure when 1g of water changes to 1g of steam is 226.2J.
17. The change in internal energy of 2kg of water at 90 degrees Celsius when it is changed to 330g of steam at 100 degrees Celsius is 4.27MJ.
18. Tensile strain is mathematically expressed as extension/initial length.
19. A certain resistance thermometer at the triple point of water has a resistance of 138.4 ohms. The temperature of the system in degrees Celsius when the resistance of the thermometer is 173 ohms is 60 degrees Celsius.
20. The resistance of the lamp at room temperature of 20 degrees Celsius can be calculated using the temperature coefficient of resistance of tungsten. However, the given value of the temperature coefficient of resistance is not provided in the question.