Thermodynamics AFCAT Questions

AFCAT Physics

Thermodynamics MCQ Questions


1.
Thermodynamics is best described as the branch of physics that deals with:
A.
Molecular constitution of matter only
B.
Motion of particles under the action of forces
C.
Electromagnetic interactions of matter
D.
Heat, temperature and inter-conversion of heat and other forms of energy
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ANSWER :
D. Heat, temperature and inter-conversion of heat and other forms of energy
2.
Before the modern concept of heat as a form of energy, heat was regarded as:
A.
A property of light
B.
Vibrational motion of atoms only
C.
A fine invisible fluid called caloric
D.
A form of electromagnetic radiation only
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ANSWER :
C. A fine invisible fluid called caloric
3.
The experiment that demonstrated heat is a form of energy was performed by Benjamin Thomson (Count Rumford) in 1798 by:
A.
Heating water with sunlight in a closed vessel
B.
Compressing a gas in a cylinder
C.
Mixing ice and salt to lower temperature
D.
Boring a brass cannon and observing heat generation depending on work done
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ANSWER :
D. Boring a brass cannon and observing heat generation depending on work done
4.
In thermodynamics, the state of a gas is specified by macroscopic variables such as:
A.
Co-ordinates and velocities of all molecules
B.
Only the kinetic energy of each molecule
C.
Pressure, volume, temperature, mass and composition
D.
Spin states and quantum numbers of molecules
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ANSWER :
C. Pressure, volume, temperature, mass and composition
5.
Temperature of a body is related to:
A.
The kinetic energy of the body as a whole
B.
The potential energy of the body in a gravitational field
C.
The total mechanical energy including motion of centre of mass
D.
The energy of internal (disordered) motion of its molecules
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ANSWER :
D. The energy of internal (disordered) motion of its molecules
6.
When a bullet pierces a wood block and stops, its kinetic energy is mainly converted into:
A.
Light energy emitted by the bullet
B.
Sound energy radiated outward only
C.
Electrical energy stored in the wood
D.
Heat, raising the temperature of the bullet and surrounding wood
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ANSWER :
D. Heat, raising the temperature of the bullet and surrounding wood