All the heat generated by a current of 2A passing through a resistor of 6Ω for 2.5s is used to evaporate 5 g of a liquid at its boiling point. What is the specific latent heat of the liquid?
A. 60 Jg−¹ B. 120 Jg−¹ C. 300 Jg−¹ D. 360 Jg−¹ E. 1500 Jg−¹ Correct Answer: Option B Explanation Electrical Energy = Heat Energy. I²Rt = ml 2² x 6 25 = 5 x L. L = 120 Jg-1.A block of ice at its melting point is left on a table in the atmosphere and observed to melt gradually. Which of the following statements is true about the melting process?
A. the reaction force of the table on the ice breaks the ice into water molecules B. heat extracted from the ice block makes the ice block cold C. the ice block absorbs heat from the atmosphere and its temperature rises D. the atmosphere absorbs heat from the ice...
Which of the following substance is not a good conductor of electricity?
A. Human body B. Glass C. Aluminium D. Earth E. Copper Correct Answer: Option B – GlassWater in an open container boils at a lower temperature when heated at the top of a mountain than at sea-level because at the top of a mountain the?
A. relative humidity is higher than at sea-level B. rays of the sun add more heat to the water C. temperature is lower than that at sea-level D. pressure is lower than that at sea-level E. pressure is more than that at sea-level Correct Answer: Option D –...
Which of the following statements is/are not correct?
A. Evaporation takes place only at the surface of the liquid B. Boiling takes place throughout the volume of the liquid C. Evaporation takes place at all temperatures D. Boiling takes place at a particular temperature for a liquid at a fixed external pressure E. The...Products
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