Q.1
##### The dimensions of viscosity in terms of M,L,T is ?
• $MLT^{-1}$
• $M^{-1}LT^{-1}$
• $ML^{-1}T^{-2}$
• $ML^{-1}T^{-1}$
Q.2
##### A man is sitting in a boat which is floating on a pond. The man drinks some water from pond. What happens to the water level in the pond? The water level will
• Rises
• falls
• remains same
• Not enough information
Q.3
##### A body floats in water with 40% of its volume outside water.When the same body floats in some liquid,60% of its volume remains outside the liquid. The relative density of the liquid is
• 1.5
• 1.2
• .6
• None of these
Q.4
##### A closed compartment containing gas is moving with some acceleration in horizontal direction. Then the pressure in the compartment is? Neglect the effect of gravity
• lower in the front side
• same everywhere
• lower in the rear side
• Not enough information
Q.5
##### A object of relative density 10 is released from rest on the surface of a lake.if the viscous effect are ignored ,the object sinks in the water with an acceleration ?
• 10g
• 9g/10
• 11g/10
• None of these
Q.6
##### Machine parts are jammed in winter due to
• Increase in surface tension of lubricant
• Decrease in viscosity of lubricant
• Decrease in surface tension of lubricant
• increase in viscosity of lubricant
Q.7
##### A horizontal pipeline carries water in a stream line flow? At point A along the pipe,the cross-sectional area is 10 cm2,the water velocity is 1 m/s and pressure is 2000 Pa.What is the pressure at point B where cross-sectional area is 5.0 cm2
• 500 Pa
• 400 Pa
• 300 Pa
• None of the above
Q.8
##### A big drop of water is broken into large number of small drops? The surface energy would
• Remains unchanged
• will increase
• will decrease
• Not enough information
Q.9
##### A U tube containing a liquid is accelerated horizontally with constant acceleration a .The separation between the limb's is L. The Difference in the height of the liquid in the two arms would be
• $L \sqrt { \frac {a}{g}}$
• $\frac {aL}{g}$
• $\frac {L}{2}$
• $\frac {a^2L}{g^2}$
Q.10
##### A block of wood has a mass 25 g. When a 5 g metal piece with a volume 2 cm3 is attached to the bottom of the block,the wood barely floats in water what is the volume of the V of the wood
• $20 cm^3$
• $38 cm^3$
• $28 cm^3$
• None of these
Q.11
##### A solid sphere of radius R,made up of a material of bulk modulus K is surrounded by a liquid in a cylindrical container. A mass-less piston of area A floats on the surface of the liquid.When a mass M is placed on the piston to compress the liquid,the fractional change in the radius of the sphere is
• $\frac {Mg}{2AK}$
• $\frac {3Mg}{AK}$
• $\frac {Mg}{3AK}$
• $\frac {Mg}{AK}$
Q.12
##### A small hole is there near the bottom of the water filled container. The speed of the water ejected depends on
• Density of the liquid
• acceleration due to gravity
• height of the liquid above the hole
• All of the above
Q.13
##### if the hollow bob of a simple pendulum be filled with mercury that drains out slowly,its time period
• increases continuously
• decreases continuously
• remains same
• first increases and then decreases
Q.14
• .50 cm2
• .9 cm2
• .1 cm2
• .69 cm2
Q.15
##### Water rises to a height of 13.6 cm in a capillary tube dipped in water.When the same tube is dipped in mercury ,it is depressed by $3 \sqrt {2}$ cm. The angle of contact in water is 0°. The angle of contact in mercury =135° Given : Relative density of mercury =13.6 Find out the ratio of the surface tensions of mercury and water
• 6
• 5
• 11
• None of these