1st Year Physics Chapter 5 TestSolid and Fluid Dynamics

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

1. The quantity which remains constant in the equation of continuity is:

   1. Volume

   2. Mass flow rate

   3. Pressure

   4. Area

2. The upthrust acting on a floating object is equal to:

   1. Volume of the object

   2. Density of the fluid

   3. Weight of the object

   4. Volume of water displaced

3. The lift force experienced by an aeroplane wings is primarily due to:

   1. Viscosity of air

   2. Density of air

   3. Pressure difference above and below the wing

   4. Gravitational force

4. Bernoulli's Theorem is applicable to:

   1. Solids

   2. Plasma state

   3. Fluids

   4. Liquids

5. The effect of decrease of pressure with the increase in speed of a fluid in horizontal pipe is:

   1. Torricelli's effect

   2. Bernoulli's effect

   3. Venture's effect

   4. Doppler's effect

6. Maximum drag force on 1kg falling sphere is:

   1. 9.8 N

   2. 1 N

   3. 98 N

   4. 4.9 N

7. The working of carburetor or car uses:

   1. Equation of continuity

   2. Gravitational law

   3. Bernoulli's theorem

   4. Stokes low

8. The velocity of rain drop attains constant value due to:

   1. Air currents

   2. Up thrust of air

   3. Surface tension

   4. Viscous force exerted by air

9. Which of the following is not a property of an ideal fluid?

   1. Incompressibility

   2. Zero viscosity

   3. Constant temperature

   4. Irrational flow

10. A horizontal pipe narrows from a diameter of 10cm to 5cm. For a fluid flowing from larger diameter to smaller diameter:

    1. The velocity and pressure both increases

    2. The velocity increases and pressure decreases

    3. The velocity decreases and pressure increase

    4. Velocity and pressure both decreases