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سیال حرکیات

گیارہویں جماعت · طبیعیات · 5 سوالات

نام: ____________________   تاریخ: ____________

  1. The equation of continuity for an incompressible fluid says:

    • A A v is constant
    • B P v is constant
    • C A + v is constant
    • D A / v is constant

  2. Water flows through a pipe of area 4 cm2 at 2 m/s into a section of area 2 cm2. What is the new speed?

    • A 8 m/s
    • B 1 m/s
    • C 4 m/s
    • D 2 m/s

  3. Bernoulli's principle says that where the speed of a fluid is higher, the pressure is:

    • A Lower
    • B Infinite
    • C Higher
    • D The same

  4. Viscosity of a liquid generally:

    • A Decreases with temperature
    • B Increases with temperature
    • C Is not affected
    • D Becomes zero when heated

  5. An aeroplane wing gets lift because air above it moves:

    • A Backwards
    • B At the same speed
    • C Slower, with higher pressure
    • D Faster, with lower pressure

جوابی کلید

1. A, 2. C, 3. A, 4. A, 5. D

  1. The flow rate A v is the same at all points of a pipe.

  2. A1 v1 = A2 v2, so v2 = 4 x 2 / 2 = 4 m/s.

  3. Along a line of flow, faster flow means lower pressure.

  4. Liquids become less viscous as they get hotter.

  5. Faster air above gives lower pressure, so there is a net upward force.