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General
Easy
Question
A hollow sphere of mass M and radius r is immersed in a tank of water 
The sphere would float if it were set free. The sphere is tied to the bottom of the tank by two wires which makes angle 45° with the horizontal as shown in the figure. The tension 
in the wire is :
The correct answer is:
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A dumbbell is placed in water of density 
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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
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A U – tube having horizontal arm of length 20 cm, has uniform cross-sectional area 
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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 
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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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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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