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General
Easy
Question
A dumbbell is placed in water of density 
. It is observed that by attaching a mass m to the rod, the dumbbell floats with the rod horizontal on the surface of water and each sphere exactly half submerged as shown in the figure. The volume of the mass m is negligible. The value of length l is
The correct answer is:
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A slender homogeneous rod of length 2L floats partly immersed in water, being supported by a string fastened to one of its ends, as shown. The specific gravity of the rod is 0.75. The length of rod that extends out of water is :
A slender homogeneous rod of length 2L floats partly immersed in water, being supported by a string fastened to one of its ends, as shown. The specific gravity of the rod is 0.75. The length of rod that extends out of water is :
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An open-ended U-tube of uniform cross-sectional area contains water (density 
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is added to one arm until a layer 5 centimeters high forms, as shown in the figure above. What is the 
of the heights of the liquid in the two arms?
An open-ended U-tube of uniform cross-sectional area contains water (density standing initially 20 centimeters from the bottom in each arm. An immiscible liquid of density 4.0 grams/ is added to one arm until a layer 5 centimeters high forms, as shown in the figure above. What is the of the heights of the liquid in the two arms?
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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
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A U – tube having horizontal arm of length 20 cm, has uniform cross-sectional area 
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A U – tube having horizontal arm of length 20 cm, has uniform cross-sectional area It is filled with water of volume 60 cc. What volume of a liquid of density 4 g/cc should be poured from one side into the U – tube so that no water is left in the horizontal arm of the tube?
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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 
[Neglect atmospheric pressure]:
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Figure shows a three arm tube in which a liquid is filled upto levels of height l. It is now rotated at an angular frequency w about an axis passing through arm B. The angular frequency 
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A fluid container is containing a liquid of density 
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The area of cross-section of the wider tube shown in figure is 
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 wire as a parabola y = a 
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In a series R-L-C circuit, the frequency of the source is half of the resonance frequency. The nature of the circuit will be
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In figure, a lamp P is in series with an iron-core inductor L. When the switch S is closed, the brightness of the lamp rises relatively slowly to its full brightness than it would do without the inductor. This is due to
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In figure, the switch S is closed so that a current flows in the iron-core inductor which has inductance L and the resistance R. When the switch is opened, a spark is obtained in it at the contacts. The spark is due to
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