Recent questions in Class11

Water flows in a horizontal tube as shown in figure.The pressure of water changes by $600N/m^2$ between A and B where the areas of cross section are $30cm^2$ and $15cm^2$ respectively.Find the rate of flow of water through the tube

asked May 9, 2014 by sreemathi.v

1 answer

A metal piece of mass 160g lies in equlibrium inside a glass of $H_2O$.The piece touches the bottom of the glass at a small number of points.If the density of the metal is $8000Kg/m^3$.Find the normal force exerted by the bottom of the glass on the metal piece

asked May 9, 2014 by sreemathi.v

1 answer

The area of cross section of the wider tube shown in figure is $900cm^2$.If the boy standing on the piston weights 45Kg then difference in the levels of water in the two tubes are ($\rho_{water}=1000Kg/m^3)$

asked May 9, 2014 by sreemathi.v

1 answer

In a test experiment on a model aeroplane in a wind tunnel,the flow speeds on the upper and lower surfaces of the wing are $70ms^{-1}$ respectively.What is the lift on the wing if its area is $2.5m^2$?Take the density of air to be $1.3Kgm^{-3}$

asked May 9, 2014 by sreemathi.v

1 answer

A U-tube contains water and methylated spirit separated by mercury.The mercury columns in the two arms are in level with 10cm of water in one arm & 12.5cm of spirit in the other.What is specific gravity of spirit ?

asked May 9, 2014 by sreemathi.v

1 answer

In Milikan's oil drop experiment,what is the terminal speed of an uncharged drop of radius $2\times 10^{-5}m$ and density $1.2\times 10^3Kgm^{-3}$?Take the viscocity of air at the temperature of the experiment is $1.8\times 10^{-5}pas$.How much is the viscous force on the drop at the speed?Neglect byoyancy of the drop due to air.

asked May 9, 2014 by sreemathi.v

1 answer

What is the pressure inside the drop of mercury of radius 3mm at room temperature?S.T of mercury at that temperature $(20^{\large\circ}C)$ is $4.65\times 10^{-1}Nm^{-1}$.The $P_{atm}=1.01\times 10^4pa$.Also give excess pressure inside the drop

asked May 9, 2014 by sreemathi.v

1 answer

U-shaped wire is dipped in a soap solution,and removed.The thin film formed between the wire and the light slider,supports a weight of $1.5\times 10^{-2}N$(which includes the small weight of the slider).The length of slider is 30cm.What is the surface tension of the film?

asked May 9, 2014 by sreemathi.v

1 answer

From the figure below,(A) & (B) refer to the study of flow of a (non-viscous) liquid.Which of the two figures is incorrect?($P_1$ & $P_2$ represents pipe)

asked May 9, 2014 by sreemathi.v

1 answer

There is a small hole near the botttom of an open tank filled with a liquid.The speed of water ejected does not depend on

asked May 9, 2014 by sreemathi.v

1 answer

The three vessels shown in figure below have same base area.Equal volume of a liquid are passed in the three vessels.The force on the base will be

asked May 9, 2014 by sreemathi.v

1 answer

Equal mass of three liquids are kept in three identical cylindrical vessel A,B and C.The densities are $\rho_A,\rho_B,\rho_C$ with $f_A < f_B < f_C$.The force on the base will be

asked May 9, 2014 by sreemathi.v

1 answer

A wooden object floats in $H_2O$ kept in beaker.The object is near a side of the beaker (given in diagram).Let $P_1,P_2,P_3$ be the pressures at the three points $A,B$ and $C$ of the bottom as shown in figure.

asked May 9, 2014 by sreemathi.v

1 answer

Water is flowing through a long horizontal tube.Let $P_A$ & $P_B$ be the pressures at two horizontal points A and B of the tube.

asked May 9, 2014 by sreemathi.v

1 answer

Bernoulli’s theorem is based on conservation of which of the following:

asked May 9, 2014 by sreemathi.v

1 answer

The only possible dimensionless group that combines velocity $V_1$ body size $L$,fluid density $\rho$ and surface tension coefficient $\sigma$ is

asked May 9, 2014 by sreemathi.v

1 answer

The absolute viscocity $\mu$ of a fluid is primarily a function of

asked May 9, 2014 by sreemathi.v

1 answer

A rod of mass M of radius r,length l made up of material of young modulus Y is rotating in horizontal plane with angular velocity $\omega$.

asked May 9, 2014 by sreemathi.v

1 answer

A rod of radius 2mm,length 80cm density $5KKg/m^3$ and made up of material of $Y=1\times 10^{10}N/m^2$.Find the elongation due to its own weight.

asked May 9, 2014 by sreemathi.v

1 answer