the reaction force of the table on the ice breaks the ice into water molecules
heat extracted from the ice block makes the ice block cold
the ice block absorbs heat from the atmosphere and its temperature rises
the atmosphere absorbs heat from the ice block and its temperature falls
the ice block absorbs heat from the atmosphere and its temperature remains constant as it melts
Correct answer is E
The heat of fusion is the quantity of heat necessary to change of a solid to a liquid with no temperature change
533000J
230000J
117200J
113000J
4200J
Correct answer is C
Q = McΔθ + ml
Q = {50 x 4.2 x (100 - 80) + 50 x 2260} 117200J.
Which of the following substance is not a good conductor of electricity?
Human body
Glass
Aluminium
Earth
Copper
Correct answer is B
No explanation has been provided for this answer.
relative humidity is higher than at sea-level
rays of the sun adds more heat to the water
temperature is lower than that at sea-level
pressure is lower than that at sea-level
pressure is more than that at sea-level
Correct answer is D
Refer to Elementary physics, pressure reduces with height.
Which of the following statements is/are not correct?
Evaporation takes place only at the surface of the liquid
Boiling takes place throughout the volume of the liquid
Evaportaion takes place at all temperatures
Boiling takes place at a particular temperature for a liquid at a fixed external pressure
The boiling point of a liquid is not affected by impurities
Correct answer is E
No explanation has been provided for this answer.