A wooden block is floating in a water tank. The block is pressed to its bottom. During the process, work done is equal to
  • work done against upthrust exerted by the water.
  • work done against upthrust plus loss of gravitational potential energy of the block.
  • work done against upthrust minus loss of gravitational potential energy of the block.
  • None of these.
When the temperature is increased, the angle of contact of a  liquid
  • remains the same
  • decreases
  • first, increase and then decrease
  • increases
A rectangular vessel, when full of water, takes 10 min to be emptied through an orifice in its bottom. How much time will it take to be emptied, when half filled with water?
  • 9 min
  • 7 min
  • 5 min
  • 3 min
The surface tension of soap solution is $25 \times 10^{-3} N/m$.  The excess pressure inside a soap bubble of diameter 1 cm is
  • 10 Pa
  • 20 Pa
  • 15 Pa
  • 15 Pa
A spherical body of diameter D is falling in a viscous medium. Its terminal velocity is proportional to
  • $V_t \alpha D^{1/2}$
  • $V_t \alpha D^{3/2}$
  • $V_t \alpha D^{2}$
  • $V_t \alpha D^{5/2}$
An incompressible fluid flows steadily through a cylindrical pipe which has radius 2R at point A and R at a point B further along the flow direction, If the velocity  at A is v, then that at B is
  • v/2
  • v
  • 2v
  • 4v
A square wire frame of size L is dipped in a liquid. On taking out, a membrane is formed. If the surface tension of liquid is T,  Force acting on the frame will be
  • 2TL
  • 4TL
  • 8TL
  • 10TL
Bernoulli’s equation is consequence of conservation
  • energy
  • linear momentum
  • mass
  • angular momentum
In the following questions, a statement of assertion is followed by a statement of reason. You are required to choose the correct one out of the given five responses and mark it as (a) If both assertion and reason are true and reason is the correct explanation of the assertion. (b) If both assertion and reason are true but reason is not correct explanation of the assertion. (c) If assertion is true, but reason is false. (d) If both assertion and reason are false. (e) If reason is true but assertion is false. Assertion: Turbulence is always dissipative. Reason: High Reynold number promotes turbulence
  • (a)
  • (b)
  • (c)
  • (d)
  • (e)
In the following questions, a statement of assertion is followed by a statement of reason. You are required to choose the correct one out of the given five responses and mark it as (a) If both assertion and reason are true and reason is the correct explanation of the assertion. (b) If both assertion and reason are true but reason is not correct explanation of the assertion. (c) If assertion is true, but reason is false. (d) If both assertion and reason are false. (e) If reason is true but assertion is false. Assertion: The machine parts are jammed in the winter Reason: The viscosity of the lubricants used in the machines increases at low temperature
  • (a)
  • (b)
  • (c)
  • (d)
  • (e)
In the following questions, a statement of assertion is followed by a statement of reason. You are required to choose the correct one out of the given five responses and mark it as (a) If both assertion and reason are true and reason is the correct explanation of the assertion. (b) If both assertion and reason are true but reason is not correct explanation of the assertion. (c) If assertion is true, but reason is false. (d) If both assertion and reason are false. (e) If reason is true but assertion is false. Assertion: The stream of water flowing at high speed from a garden hose, pipe tends to spread like a fountain when held vertically up but tends to narrow down when held vertically down. Reason: In any steady flow of an incompressible fluid,  the volume flow rate of the fluid remains constant.  
  • (a)
  • (b)
  • (c)
  • (d)
  • (e)
In the following questions, a statement of assertion is followed by a statement of reason. You are required to choose the correct one out of the given five responses and mark it as (a) If both assertion and reason are true and reason is the correct explanation of the assertion. (b) If both assertion and reason are true but reason is not correct explanation of the assertion. (c) If assertion is true, but reason is false. (d) If both assertion and reason are false. (e) If reason is true but assertion is false. Assertion: Bubble of soap is larger than that of water Reason: Surface tension of soap bubble is less than that of water
  • (a)
  • (b)
  • (c)
  • (d)
  • (e)
Water stands at a depth H in a tank whose side walls are vertical. A hole is made on one of the walls at a depth h below the water surface. Find at what distance from the foot of the wall does the emerging stream of water strike the floor
  • $2 \sqrt {H(H-h)}$
  • $2 \sqrt {h(H-h)}$
  • $2 \sqrt {h(H+h)}$
  • $2 \sqrt {H(H+h)}$
for what value of h this range is maximum ?
  • H/3
  • H/4
  • 3H/4
  • H/2
What is the maximum possible range ?
  • H/2
  • 2H
  • H
  • H/4
Dynamic lift is related to
  • Bernoulli’s theorem
  • Archimedes’ theorem
  • Pascals law
  • Equation of continuity
A ball floats on the surface of the water in a container exposed to the atmosphere. Will the ball remain immersed at its former depth or will it sink or will it rise if the container is covered and the air is removed?
  • The ball sinks
  • The ball rises
  • The ball remains immersed at its former depth
  • It oscillates
Along a streamline
  • the velocity of a fluid particle remains constant.
  • the velocity of all fluid particles crossing a given position is constant.
  • the velocity of all fluid particles at a given instant is constant.
  • the speed of a fluid particle remains constant.
0 h : 0 m : 1 s

Answered Not Answered Not Visited Correct : 0 Incorrect : 0