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Acoustics
An electric kettle contains 1.5 kg of water at
100o
C and powered by a 2.0 kW electric element. If the thermostat of the kettle fails to operate, approximately how long will it take for the kettle boil dry? (Take the specific latent heat of vaporization of water as
2000kJkg−1)
100o
C and powered by a 2.0 kW electric element. If the thermostat of the kettle fails to operate, approximately how long will it take for the kettle boil dry? (Take the specific latent heat of vaporization of water as
2000kJkg−1)
Acoustics
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
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
Acoustics
One of these is NOT a basic assumption of kinetic theory of ideal gases
a gas consist of a large number of molecules
the attraction between the molecules is negligible
the kinetic energy of the molecules is changing continuously
the gas molecules are in a state of continuous random motion
a gas consist of a large number of molecules
the attraction between the molecules is negligible
the kinetic energy of the molecules is changing continuously
the gas molecules are in a state of continuous random motion
Acoustics
One of these is an example of thermal radiation detector
bolometer
thermometer
thermal rod
thermal glass
bolometer
thermometer
thermal rod
thermal glass
Acoustics
If the volume of a gas is
500cm3
at
127o
C and 380mm of mercury, calculate the volume of this gas at s.t.p
115cm3
128:7cm3
149:2cm3
170:6cm3
500cm3
at
127o
C and 380mm of mercury, calculate the volume of this gas at s.t.p
115cm3
128:7cm3
149:2cm3
170:6cm3
Acoustics
In conduction, thermal energy is transported by
the movement of a fluid
the collision of particles
electromagnetic fields
the propagation of sound waves
the movement of a fluid
the collision of particles
electromagnetic fields
the propagation of sound waves
Acoustics
A string of natural length L extends to a new length L' under tensile force F. If Hooke’S law applies, the work done in stretching the spring is ------------
1/2FL
1/2FL'
1/2 F(L-L')
F(L-L')
1/2FL
1/2FL'
1/2 F(L-L')
F(L-L')
Acoustics
The molecules of a liquid and those of an object on it spills are held together by what type of forces?
Acoustics
Which of these is correct about viscosity?
it increases with increase in temperature
it varies with the relative velocity of the surfaces in contact
it is does not vary from one liquid to another
both viscous force and upthrust act upwards
it increases with increase in temperature
it varies with the relative velocity of the surfaces in contact
it is does not vary from one liquid to another
both viscous force and upthrust act upwards
Acoustics
derive expressions for potential energy and kinetic energy of an oscillating spring-mass system
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