If for gas, R/C_v =0.67, this gas is made up of molecules which are 

PQRS is a rectangular frame of copper wire shown in figure. The side RS of the frame is movable.  If a soap film is formed on it then the diameter of the wire to maintain equilibrium will be (given surface tension of soap solution=0.045 N/m and density of copper = 8.96 x 10³ kg/m³  ) 

An object is moving through the liquid.  The viscous damping force acting on its is proportional to the velocity.  Then dimensions of constant of proportionality are

Radius of one arm of hydraulic lift is four times of radius of other arm.  What force should be applied on narrow arm to lift 100 kg ?

A 20 cm long capillary tube is dipped in water.  The water rises up to 8 cm.  If the entire arrangement is put in a freely falling elevator the length of water column in the capillary tube will be

A capillary tube when immersed vertically in a liquid records a rise of 3.0 cm. If the tube is half immersed in the liquid at an angle of 60^o with the vertical, the length of the liquid column along the tube will be :

A hemispherical portion of radius R is removed from the bottom of a cylinder of radius R.  The volume of the remaining cylinder is V and mass M.  It is suspended by a string in a liquid of density , where it stays vertical.  The upper surface of the cylinder is at a depth h below the liquid surface.  The force on the bottom of the cylinder by the liquid is

Spherical balls of radius R are falling in a viscous fluid of viscosity η with a velocity v.  The retarding viscous force acting on the spherical ball is

Drops of liquid of density are floating half immersed in a liquid of density .  If the surface tension of the liquid is T, then the radius of drop will be :

A bubble is at the bottom of the lake of depth h.  As the bubble comes to sea level, its radius increases three times.  If atmospheric pressure is equal to l metre of water column, then h is equal to