Class XI

Density is defined as
  1. volume per unit mass
  2. volume of 10 kg of the material
  3. volume of 1 kg of the material
  4. mass per unit volume
in laminar flow
  1. adjacent layers of fluid move in circle crossing each other each other and the flow is steady
  2. adjacent layers of fluid slide smoothly past each other and the flow is unsteady
  3. adjacent layers of fluid do not slide smoothly past each other and the flow is unsteady
  4. adjacent layers of fluid slide smoothly past each other and the flow is steady
If a pipe carrying incompressible liquid has an area A1A1 and velocity V1V1 at one point A2A2 and V2V2 at another point, the equation of continuity gives the relation
  1. A1V1=A2V2
  2. A1V1=2A2V2
  3. A1V1=3A2V2
  4. A1V1=2A2V
The pressure at a depth of h in a fluid of density ρρ at a place where the acceleration due to gravity is g and the pressure at h=0 is p0p0 is given by
  1. p = p0p0 + 2ρ2ρ gh
  2. p = p0p0+ 3ρ3ρ gh
  3. p = ρρ gh
  4. p = p0p0 + ρρ gh
Flow is said to be steady if
  1. the flow rate decreases 10%% every second
  2. the flow rate increases with time
  3. the flow rate does not change with time
  4. the flow rate decreases 20%% every second
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