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Physics Chapter 6 : Topic 10
Superfluidity
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Superfluidity refers to a state of matter in which a liquid has:
Reasoning: Superfluidity is the property of certain liquids in which their viscosity becomes zero, allowing them to flow without resistance.
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The most important characteristic of a superfluid is that it can flow:
Reasoning: A superfluid has zero viscosity, so it can flow without energy loss caused by internal friction.
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If a superfluid is placed in an open container, it can climb the walls and escape. This phenomenon occurs because:
Reasoning: Due to zero viscosity, the superfluid can creep along the container walls and move out without resistance.
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Which observation provides evidence for superfluid behavior?
Reasoning: The ability of a superfluid to creep over container walls is a direct consequence of zero viscosity.
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A scientist stirs a superfluid and then removes the stirring force. What will happen to the vortices formed in the liquid?
Reasoning: Since a superfluid has zero viscosity, there is no internal friction to slow down the vortices.
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Why do vortices in a superfluid continue spinning for a very long time?
Reasoning: Zero viscosity means no frictional force acts against the rotational motion.
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Which statement correctly describes the viscosity of a superfluid?
Reasoning: Superfluidity occurs when a liquid enters a state where its viscosity becomes zero.
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A normal liquid is stirred in a container and then left alone. Compared with a superfluid, the normal liquid:
Reasoning: Normal liquids have viscosity, which causes friction and gradually reduces motion.
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The ability of a superfluid to move over the walls of a container mainly shows that:
Reasoning: Zero viscosity allows the liquid to flow freely over surfaces without resistance.
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Which condition is necessary for a liquid to become a superfluid?
Reasoning: Superfluidity occurs in certain liquids at very low temperatures.
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If the viscosity of a liquid decreases toward zero, its ability to flow will:
Reasoning: Lower viscosity means less resistance to flow, and zero viscosity allows unrestricted flow.
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A superfluid flows through a narrow tube. Compared with an ordinary liquid, the superfluid will:
Reasoning: The absence of viscosity allows superfluids to pass through narrow channels without resistance.
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A student claims: “A superfluid keeps moving because an external force continuously acts on it.” This statement is:
Reasoning: In a superfluid, motion can continue without an applied force because there is no viscous resistance.
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Which property distinguishes a superfluid from an ordinary liquid?
Reasoning: Zero viscosity allows continuous motion without energy dissipation.
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If the viscosity of a liquid is exactly zero, the liquid is expected to:
Reasoning: Zero viscosity means no internal friction, allowing unrestricted flow.
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A superfluid is stirred inside a container. After several hours, the rotation continues. What conclusion can be made?
Reasoning: Persistent vortices indicate the absence of viscosity, which is a key feature of superfluidity.
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Why does a superfluid not lose kinetic energy during flow?
Reasoning: Viscosity causes energy loss through friction. A superfluid has no viscosity, so energy loss does not occur.
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Which example best demonstrates the practical implication of superfluidity?
Reasoning: Wall climbing is a unique behavior caused by the zero viscosity of superfluids.
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If a superfluid vortex is rotating, the rotational energy will:
Reasoning: Without viscosity, frictional damping is absent, so vortices continue rotating.
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Which statement about superfluidity is FALSE?
Reasoning: Superfluids are defined by zero viscosity, not high viscosity.
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A container is filled with a superfluid. If the container is tilted, the liquid may:
Reasoning: The absence of viscosity allows superfluids to flow easily under small influences.
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The continuous spinning of vortices in a superfluid is similar to:
Reasoning: Both situations involve motion continuing because frictional forces are absent or negligible.
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A researcher observes that a liquid has zero viscosity and flows without resistance. The liquid is most likely:
Reasoning: Zero viscosity and resistance-free flow are defining characteristics of superfluidity.
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The main reason superfluids can “empty themselves” from containers is:
Reasoning: Without viscous resistance, the liquid can move along surfaces and escape from the container.
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Which of the following correctly compares normal liquids and superfluids?
Reasoning: The key difference is that ordinary liquids have viscosity while superfluids have zero viscosity.
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