Chapter 6 - Fluid Dynamics - 1

Chapter 6 - Fluid Dynamics - 1

1. The speed of fluid is directly proportional to its pressure.

a) False
b) True

2. A two meter high cylinder containing water is hit by four bullets of same calibre at 1.2m, 1.8m, 0.6m and 0.3m above the ground. The speed of efflux is maximum from:-

a) 0.3m high hole
b) 0.6m high hole
c) 1.8m high hole
d) 1.2m high hole

3. Two rowboats moving parallel in the same direction will:-

a) none of the above
b) be pulled towards each other
c) get apart due to increase in pressure in between
d) remain moving in the same direction

4. Air blows from:-

a) high pressure region to low pressure region
b) low pressure region to high pressure region
c) high temperature to low temperature
d) low temperature to high temperature

5. A liquid droplet of radius "r" having a density "ρ" passes through a fluid of viscosity η. Its maximum velocity after some time will be:-

a) 2gr² ρ / 9 η
b) 2g ρ / 9 η
c) 9gr²ρ / 2 η
d) 4gr³ρ / 9 η

6. A two meter high tank is full of water. A hole appears at its middle. What is the speed of efflux:-

a) 3.75 m/sec
b) 4.42 m/sec
c) 4.91 m/sec
d) 5.11 m/sec

7. The aeroplane moves up when the pressure under its wings becomes greater than the pressure above its wings.

a) True
b) False

8. At high altitude, the blood oozes out of nose and ear because:-

a) The percentage of oxygen in the air increases
b) The atmospheric pressure decreases there
c) The density of blood decreases at high altitudes
d) The blood pressure increases at high altitudes

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