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question_answer1) Assertion : It is easier to spray water in which some soap is dissolved. Reason : Soap is easier to spread.
question_answer2) Assertion : It is better to wash the clothes in cold soap solution. Reason : The surface tension of cold solution is more than the surface tension of hot solution.
question_answer3) Assertion : When height of a tube is less than liquid rise in the capillary tube, the liquid does not overflow. Reason : Product of radius of meniscus and height of liquid in capillary tube always remains constant.
question_answer4) Assertion : A needle placed carefully on the surface of water may float, whereas a ball of the same material will always sink. Reason : The buoyancy of an object depends both on the material and shape of the object.
question_answer5) Assertion : A large force is required to draw apart normally two glass plates enclosing a thin water film. Reason : Water works as glue and sticks two glass plates.
question_answer6) Assertion : The impurities always decrease the surface tension of a liquid. Reason : The change in surface tension of the liquid depends upon the degree of contamination of the impurity.
question_answer7) Assertion : The angle of contact of a liquid decrease with increase in temperature. Reason : With increase in temperature, the surface tension of liquid increase.
question_answer8) Assertion : The concept of surface tension is held only for liquids. Reason : Surface tension does not hold for gases.
question_answer9) Assertion : At critical temperature, surface tension of a liquid becomes zero. Reason : At this temperature, intermolecular forces for liquids and gases become equal. Liquid can expand without any restriction.
question_answer10) Assertion : A large soap bubble expands while a small bubble shrinks, when they are connected to each other by a capillary tube. Reason : The excess pressure inside bubble (or drop) is inversely proportional to the radius.
question_answer11) Assertion : Tiny drops of liquid resist deforming forces better than bigger drops. Reason : Excess pressure inside a drop is directly proportional to surface tension.
question_answer12) Assertion : The water rises higher in a capillary tube of small diameter than in the capillary tube of large diameter. Reason : Height through which liquid rises in a capillary tube is inversely proportional to the diameter of the capillary tube.
question_answer13) Assertion : Hot soup tastes better than the cold soup. Reason : Hot soup has high surface tension and it does not spread properly on our tongue.
question_answer14) Assertion : The shape of a liquid drop is spherical. Reason : The pressure inside the drop is greater than that of outside.
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