Physics
Fluid-Mechanics
Easy
Question
A bird resting on the floor of an airtight box which is being carried by a boy starts flying. The boy will fell that the box is now:
- heavier
- lighter
- same in weight
- Lighter in the beginning and heavier later
The correct answer is: same in weight
Since the box is airtight its weight will not change even when bird fly inside the box. Hence, the boy feels that the box shows no change in weight.
Related Questions to study
Physics
A boy is carrying a bucket of water in one hand and piece of plastic in the other. After transferring the plastic piece to the bucket (in which it floats the boy will carry:
A boy is carrying a bucket of water in one hand and piece of plastic in the other. After transferring the plastic piece to the bucket (in which it floats the boy will carry:
PhysicsFluid-Mechanics
Physics
A piece of ice is floating in a beaker containing water When ice melts, the temperature falls from 200C to 40C and the level of water:
A piece of ice is floating in a beaker containing water When ice melts, the temperature falls from 200C to 40C and the level of water:
PhysicsFluid-Mechanics
Physics
A wooden block is floating in a water tank. The block is pressed to its bottom. During the process, work done is equal to:
A wooden block is floating in a water tank. The block is pressed to its bottom. During the process, work done is equal to:
PhysicsFluid-Mechanics
Physics
PhysicsFluid-Mechanics
Physics
For the L shaped tube filled with liquid of density d, the value of acceleration a so that pressure at point A is half of that of pressure at point B which is atmosphere pressure
P0
For the L shaped tube filled with liquid of density d, the value of acceleration a so that pressure at point A is half of that of pressure at point B which is atmosphere pressure
P0
PhysicsFluid-Mechanics
Physics
A U-tube in which the cross-sectional area of the limb on the left is one quarter, the limb on the right contains mercury (density 13.6 g/cm3). The level of mercury in the narrow limb is at a distance of 36 cm from the upper end of the tube. What will be the rise in the level of mercury in the right limb if the left limb is filled to the top with water
A U-tube in which the cross-sectional area of the limb on the left is one quarter, the limb on the right contains mercury (density 13.6 g/cm3). The level of mercury in the narrow limb is at a distance of 36 cm from the upper end of the tube. What will be the rise in the level of mercury in the right limb if the left limb is filled to the top with water
PhysicsFluid-Mechanics
Physics
Torque produced by the liquid due to the thrust on side wall about axis through bottom edge will be
Torque produced by the liquid due to the thrust on side wall about axis through bottom edge will be
PhysicsFluid-Mechanics
Physics
PhysicsFluid-Mechanics
Physics
Consider a rectangular tank of size 
filled with a liquid of density d to a height h as shown. 
Consider a rectangular tank of size filled with a liquid of density d to a height h as shown.
PhysicsFluid-Mechanics
Physics
A horizontal thin tube completely filled with a liquid of density ρ rotates about a vertical axis passing through one of its ends with an angular velocity. If P0 is pressure of the liquid at the axis of rotation, pressure at the other end of the tube will be
A horizontal thin tube completely filled with a liquid of density ρ rotates about a vertical axis passing through one of its ends with an angular velocity. If P0 is pressure of the liquid at the axis of rotation, pressure at the other end of the tube will be
PhysicsFluid-Mechanics
Physics
Find the force acting on the piston of 3 cm2 at point 2 due to the water column of height 10 m
Find the force acting on the piston of 3 cm2 at point 2 due to the water column of height 10 m
PhysicsFluid-Mechanics
Physics
A tube 1 cm2 in cross section is attached to the top of a vessel 1 cm high and of cross-section 100 cm2. Water is poured into the system filling it to a depth of 100 cm above the bottom of the vessel . 
A tube 1 cm2 in cross section is attached to the top of a vessel 1 cm high and of cross-section 100 cm2. Water is poured into the system filling it to a depth of 100 cm above the bottom of the vessel .
PhysicsFluid-Mechanics
Physics
In previous question, if 15 cm of water and spirit each are further poured into the respective arms of the tube, difference in the level of mercury in the two arms is (Take, relative density of mercury =13.6)
In previous question, if 15 cm of water and spirit each are further poured into the respective arms of the tube, difference in the level of mercury in the two arms is (Take, relative density of mercury =13.6)
PhysicsFluid-Mechanics
Physics
A uniformly tapering vessel of height h whose lower and upper radii are r and R is completely filled with a liquid of density 
. The force that acts on the base of the vessel due of the liquid is
A uniformly tapering vessel of height h whose lower and upper radii are r and R is completely filled with a liquid of density . The force that acts on the base of the vessel due of the liquid is
PhysicsFluid-Mechanics
Physics
A cylindrical vessel containing a liquid is closed by a smooth piston of mass m. If A is the cross-sectional area of the piston and P0 is the atmospheric pressure, then the pressure of the liquid just below the piston is
A cylindrical vessel containing a liquid is closed by a smooth piston of mass m. If A is the cross-sectional area of the piston and P0 is the atmospheric pressure, then the pressure of the liquid just below the piston is
PhysicsFluid-Mechanics
