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A light semi cylindrical gate of radius R is piovted at its mid point O, of the diameter as shown in the figure holding liquid of density 
. The force F required to prevent the rotation of the gate is equal to
- none of these
The correct answer is: none of these
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In the figure shown, the heavy cylinder (radius R) resting on a smooth surface separates two liquids of densities 
and 
. The height ‘h’ for the equilibrium of cylinder must be
In the figure shown, the heavy cylinder (radius R) resting on a smooth surface separates two liquids of densities and . The height ‘h’ for the equilibrium of cylinder must be
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A liquid of mass 1 kg is filled in a flask as shown in figure. The force exerted by the flask on the liquid is (g = 10 m/s2) [Neglect atmospheric pressure]
A liquid of mass 1 kg is filled in a flask as shown in figure. The force exerted by the flask on the liquid is (g = 10 m/s2) [Neglect atmospheric pressure]
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Figure shows a there arm tube in which a liquid is filled upto levels of height l. It is now rotated at an angular frequency 
about an axis passing through arm B. The angular frequency w at which level of liquid in arm B becomes zero
Figure shows a there arm tube in which a liquid is filled upto levels of height l. It is now rotated at an angular frequency about an axis passing through arm B. The angular frequency w at which level of liquid in arm B becomes zero
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A fluid container is containing a liquid of density is accelerating upward with acceleration an along the inclined place of inclination 
as shown. Then the angle of inclination 
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A fluid container is containing a liquid of density is accelerating upward with acceleration an along the inclined place of inclination as shown. Then the angle of inclination of free surface is
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The area of cross-section of the wider tube shown in figure is 800 cm2 If a mass of 12 kg is placed on the massless piston, the difference in heights h in the level of water in the two tubes is :
The area of cross-section of the wider tube shown in figure is 800 cm2 If a mass of 12 kg is placed on the massless piston, the difference in heights h in the level of water in the two tubes is :
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A cone of radius R and height H is hanging inside a liquid of density by means of a string as shown in the figure. The force, due to the liquid acting on the slant surface of the cone is
A cone of radius R and height H is hanging inside a liquid of density by means of a string as shown in the figure. The force, due to the liquid acting on the slant surface of the cone is
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The figure shows a radiant energy spectrum graph for a black body at a temperature T. Identify the graph which correctly represents the spectral intensity versus wavelength graph at two temperatures T' and T (T < T')
The figure shows a radiant energy spectrum graph for a black body at a temperature T. Identify the graph which correctly represents the spectral intensity versus wavelength graph at two temperatures T' and T (T < T')
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The figure shows a radiant energy spectrum graph for a black body at a temperature T. If the temperature of the body is raised to a higher temperature T', then choose the correct statement(s)
The figure shows a radiant energy spectrum graph for a black body at a temperature T. If the temperature of the body is raised to a higher temperature T', then choose the correct statement(s)
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The figure shows a radiant energy spectrum graph for a black body at a temperature T. Choose the correct statement(s)
The figure shows a radiant energy spectrum graph for a black body at a temperature T. Choose the correct statement(s)
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An experiment is perfomed to measure the specific heat of copper. A lump of copper is heated in an oven, then dropped into a beaker of water. To calculate the specific heat of copper, the experimenter must know or measure the value of all of the quantities below EXCEPT the
An experiment is perfomed to measure the specific heat of copper. A lump of copper is heated in an oven, then dropped into a beaker of water. To calculate the specific heat of copper, the experimenter must know or measure the value of all of the quantities below EXCEPT the
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The intensity of radiation emitted by the Sun has its maximum value at a wavelength of 510 nm and that emitted by the North Star has the maximum value at 350 nm. If these stars behave like black bodies then the ratio of the surface temperature of the Sun and the North Star is
The intensity of radiation emitted by the Sun has its maximum value at a wavelength of 510 nm and that emitted by the North Star has the maximum value at 350 nm. If these stars behave like black bodies then the ratio of the surface temperature of the Sun and the North Star is
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The spectral emissive power 
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=
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A composite rod made of three rods of equal length and cross-section as shown in the fig. The thermal conductivities of the materials of the rods are K/2, 5K and K respectively. The end A and end B are at constant temperatures. All heat entering the face A goes out of the end B there being no loss of heat from the sides of the bar. The effective thermal conductivity of the bar is
A composite rod made of three rods of equal length and cross-section as shown in the fig. The thermal conductivities of the materials of the rods are K/2, 5K and K respectively. The end A and end B are at constant temperatures. All heat entering the face A goes out of the end B there being no loss of heat from the sides of the bar. The effective thermal conductivity of the bar is
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The ratio of the thermal resistance of the rod is
The ratio of the thermal resistance of the rod is
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Two rods A and B of different materials but same cross section are joined as in figure. The free end of A is maintained at 100°C and the free end of B is maintained at 0°C.
and rods are thermally insulated from sides to prevent heat losses then the temperature q of the junction of the two rods is
Two rods A and B of different materials but same cross section are joined as in figure. The free end of A is maintained at 100°C and the free end of B is maintained at 0°C. and rods are thermally insulated from sides to prevent heat losses then the temperature q of the junction of the two rods is
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