MCQ Collection
ECAT Physics MCQs
Practice ECAT Physics questions with answers and explanations.
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Correct Answer: C. Energy transferred because of a temperature difference
Explanation:
Heat is energy in transit between systems.
It flows spontaneously from higher to lower temperature.
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Correct Answer: D. A state in which systems in contact have no net heat transfer
Explanation:
Systems in thermal equilibrium have the same temperature.
This idea underlies the zeroth law of thermodynamics.
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Correct Answer: A. The basis for defining temperature and thermal equilibrium
Explanation:
If two systems are each in thermal equilibrium with a third, they are in equilibrium with each other.
This permits consistent temperature measurement.
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Correct Answer: B. Heat required to raise unit mass by one degree of temperature
Explanation:
Specific heat capacity describes thermal inertia.
Materials with high values require more heat for the same temperature rise.
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Correct Answer: C. Energy absorbed or released during a phase change without temperature change
Explanation:
Latent heat changes molecular arrangement rather than temperature.
Fusion and vaporization involve different latent heats.
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Correct Answer: D. Increase in dimensions caused by a temperature rise
Explanation:
Heating usually increases average particle separation.
Solids, liquids, and gases expand by different amounts.
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Correct Answer: A. Heat transfer through microscopic interactions without bulk material flow
Explanation:
Conduction transfers energy through collisions and free electrons.
It is dominant in many solids.
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Correct Answer: B. Heat transfer by bulk motion of a fluid
Explanation:
Convection combines fluid motion with thermal energy transport.
It may be natural or forced.
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Correct Answer: C. Energy transfer by electromagnetic waves
Explanation:
Thermal radiation can travel through vacuum.
Its intensity increases strongly with absolute temperature.
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Correct Answer: D. A model gas whose particles have negligible volume and no intermolecular forces except during collisions
Explanation:
The ideal gas model simplifies real gas behavior.
It works best at low pressure and high temperature.
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Correct Answer: A. 6 m/s
Explanation:
Continuity gives A₁v₁=A₂v₂.
V₂=0.06×2/0.02 = 6 m/s.
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Correct Answer: A. Pressure is inversely proportional to volume
Explanation:
For an isothermal ideal-gas process, PV is constant.
Reducing volume raises pressure.