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question_answer1) Assertion : The melting point of ice decreases with increase of pressure. Reason : Ice contracts on melting. [AIIMS 2004]
question_answer2) Assertion : Fahrenheit is the smallest unit measuring temperature. Reason : Fahrenheit was the first temperature scale used for measuring temperature. [AIIMS 1999]
question_answer3) Assertion : Melting of solid causes no change in internal energy. Reason : Latent heat is the heat required to melt a unit mass of solid. [AIIMS 1998]
question_answer4) Assertion : Specific heat capacity is the cause of formation of land and sea breeze. Reason : The specific heat of water is more than land. [AIIMS 1995]
question_answer5) Assertion : A brass disc is just fitted in a hole in a steel plate. The system must be cooled to loosen the disc from the hole. Reason : The coefficient of linear expansion for brass is greater than the coefficient of linear expansion for steel.
question_answer6) Assertion : The coefficient of volume expansion has dimension K?1. Reason : The coefficient of volume expansion is defined as the change in volume per unit volume per unit change in temperature.
question_answer7) Assertion : The temperature at which Centigrade and Fahrenheit thermometers read the same is ? 40°. Reason : There is no relation between Fahrenheit and Centigrade temperature.
question_answer8) Assertion : When a solid iron ball is heated, percentage increase is its volume is largest. Reason : Coefficient of superficial expansion is twice that of linear expansion where as coefficient of volume expansion is three time of linear expansion.
question_answer9) Assertion : A beaker is completely filled with water at 4°C. It will overflow, both when heated or cooled. Reason : There is expansion of water below and above 4°C.
question_answer10) Assertion : Latent heat of fusion of ice is 336000 J kg?1. Reason : Latent heat refers to change of state without any change in temperature
question_answer11) Assertion : Two bodies at different temperatures, if brought in thermal contact do not necessary settle to the mean temperature. Reason : The two bodies may have different thermal capacities.
question_answer12) Assertion : Specific heat of a body is always greater than its thermal capacity. Reason : Thermal capacity is the required for raising temperature of unit mass of the body through unit degree.
question_answer13) Assertion : Water kept in an open vessel will quickly evaporate on the surface of the moon. Reason : The temperature at the surface of the moon is much higher than boiling point of the water.
question_answer14) Assertion : The molecules at 0ºC ice and 0ºC water will have same potential energy. Reason : Potential energy depends only on temperature of the system.
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