Physics · Viscosity, Stoke's law, terminal velocity, streamline and turbulent flow, critical velocity
Read the following statements and pick the correct choice Statement A: With incr
Read the following statements and pick the correct choice Statement A: With increase in temperature, viscosity of a gas increases and that of a liquid decreases. Statement B: If the density of a small sphere is equal to the density of the liquid in which it is dropped, then the terminal velocity of the sphere will be zero.
- A. Both A and B are true
- B. Both A and B are false
- C. A is true and B is false
- D. B is true but A is false.
Step-by-step solution
Statement A is correct: for gases, viscosity increases with temperature due to increased molecular collisions; for liquids, viscosity decreases as temperature weakens intermolecular forces. Statement B is correct: when the sphere's density equals the liquid's density, the net force (weight minus buoyancy) is zero, so the sphere will not accelerate; if dropped from rest, it remains at rest, giving zero terminal velocity.
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