1st Year Physics Chapter 6 Test06. Fluid Mechanics

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

1. The equation of continuity is based on the law of:
   1. Conservation of momentum
   2. Conservation of mass
   3. Conservation of energy
   4. Conservation of velocity
2. In streamline flow, the velocity of particles at a point is:
   1. Always different
   2. Zero
   3. Same
   4. Infinite
3. If density remains constant for steady flow, then ρ₁ = ρ₂ and continuity becomes:
   1. A₁ + v₁ = A₂ + v₂
   2. A₁/A₂ = v₁/v₂
   3. A₁v₁ = A₂v₂
   4. A₁v₁² = A₂v₂²
4. The Venturi meter works on which principle?
   1. Conservation of mass
   2. Bernoulli's principle
   3. Archimedes' principle
   4. Pascal's law
5. In a paratrooper's jump, the parachute slows him down because:
   1. Weight increases
   2. Drag force increases
   3. Gravity decreases
   4. Air becomes denser
6. Which assumption belongs to an ideal fluid?
   1. Flow is turbulent
   2. Flow is rotational
   3. Internal friction exists
   4. Flow is laminar
7. For an ideal fluid, the relation of continuity is:
   1. AV = 0
   2. A/V = constant
   3. A × v = constant
   4. v/A = constant
8. The equation A₁v₁ = A₂v₂ applies to:
   1. Static fluids
   2. Ideal incompressible fluids
   3. Viscous fluids
   4. Gases only
9. A liquid flows through a pipe with a diameter of 10 cm at a velocity of 9 cm/s. If the diameter of the pipe then decreases to 6 cm, the new velocity of the liquid will be:
   1. 15 cm/s
   2. 21 cm/s
   3. 12 cm/s
   4. 25 cm/s
10. Superfluidity is observed mainly in:
    1. Helium gas at room temperature
    2. Liquid helium at very low temperatures
    3. Water below 0°C
    4. Any liquid under pressure