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
(P+aV2)(V−b)=RT
2 Which of the following statements is always true for a reaction in which there is no non-expansion work?
ΔH=qp
ΔU=qp
All of the above
None of the above
3 If the specific heat capacity of water initially is
4.2×103
per kg per K and
g=10m/s2
, the difference in temperature of water between the top and bottom of a 210 m high water fall is ----------
0.05oC
0.5oC
1.0oC
4.2oC
4 The latent heat of fusion of pure water is
334kJ/kg
. How much energy would it take to melt 3 kg of ice at
0oC
to water at
0oC
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
1672cm3
of steam. Take the atmospheric pressure as
1.013×105Nm−2
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
1672cm3
of steam. Take the atmospheric pressure as
1.013×105Nm−2
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 330m3 of steam at 100oC. The whole process occurs at atmospheric pressure. The latent heat of vaporization of water is 226106 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
152.0Ω
. What is the temperature of the system in degrees celcius when the resistance of the thermometer is
230.51Ω
?
414.2o
C
141.0o
C
253.2o
C
80.4o
C
20 The temperature at which the tungsten filament of a 12 V and 36W lamp operates is
1730o
C. If the temperature coefficient of resistance of tungsten is
6×10−3
/K, find the resistance of the lamp at a room temperature of 20oC
10.00Ω
0.45Ω
0.39Ω
4.00Ω