Fluid Dynamics — Physics MCQs (Class 11)
Free chapter-wise Physics MCQs with answers for MDCAT, FSc and entry tests.
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#17 The terminal velocity of a small sphere falling through a fluid is determined by:
A) balance between gravitational and drag forces
B) only by the fluid’s temperature
C) the density of the sphere
D) the velocity of the fluid
#18 The drag force $F_d$ on an object moving through a fluid is proportional to:
A) $v^2$
B) $v$
C) $\rho v$
D) $\rho v^2$
#19 If the density of the fluid is doubled, the buoyant force on an object submerged in it will be:
A) doubled
B) halved
C) unchanged
D) quadrupled
#20 Archimedes’ principle states:
A) the buoyant force is equal to the weight of the displaced fluid
B) the pressure in a fluid increases with depth
C) the velocity in a fluid is constant
D) the pressure is independent of depth
#21 In the absence of external forces, the buoyant force on a submerged object is:
A) equal to the weight of the displaced fluid
B) equal to the weight of the object
C) dependent on the density of the object
D) always zero
#22 A fluid in motion can be characterized by which of the following quantities?
A) velocity, pressure, density
B) velocity, temperature, volume
C) velocity, time, area
D) density, area, speed
#23 The ideal fluid assumptions include:
A) incompressibility, no viscosity
B) perfect elasticity
C) constant pressure
D) constant temperature
#24 For steady flow, the mass continuity equation is:
A) $\rho A v = \rho A v$
B) $A v = \text{constant}$
C) $\rho A v =\text{velocity}$
D) $P_1 = P_2$
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