Latent Heat
Trending Questions
- True
- False
What does the statement “The value of latent heat of fusion of ice is ” refer to?
The bottom of a lake does not freeze in harsh winter even when the surface is all frozen. Why?
Low conductivity of ice
High conductivity of water
Low conductivity of water
High conductivity of ice
- Temperature
- Average kinetic energy
- Volume
- Intermolecular distance
Latent heat is used to --------------------- the force of attraction between the particles.
Explain why there is no rise in temperature of a substance when it undergoes a change of state although it is still being heated.
- 448 kJ
- 548 kJ
- 487 kJ
- 934 kJ
- 2260 kJ
- 9460 kJ
- 9420 kJ
- 4520 kJ
Ratio of heat energy required to change in states of 100 g of water at 100∘C to steam to 540 g of ice to water respectively is 5:y then y =
Take latent heat of fusion 80 cal/gm and latent heat of vaporization as 540 cal/gm
A calorimeter of water equivalent 15g contains 165g of water at 25∘C. Steam at 100∘C is passed through the water for some time. The temperature is increased to 30∘C and the mass of the calorimeter and its contents is increased by 1.5 g. Calculate the latent heat of vaporization of water. Heat capacity of water is 1 cal/g∘C
- 630 cal/g
- 530 cal/g
- 1530 cal/g
- 1500 cal/g
Steam at 100oC is passed into 1.1 kg of water contained in a calorimeter of water equivalent 0.02 kg at 15oC till the temperature of the calorimeter and its contents rises to 80oC. The mass of the steam condensed in kg is
latent heat of vaporization of water = 540 cal kg−1, specific heat capacity of water = 103 cal kg−1∘C−1
0.135
0.260
0.130
0.065
When a solid is ______, its molecule gains kinetic energy and becomes very active.
Steam at 100oC is passed into 1.1 kg of water contained in a calorimeter of water equivalent 0.02 kg at 15oC till the temperature of the calorimeter and its contents rises to 80oC. The mass of the steam condensed in kg is
Specific heat of water = 1 kcal/kg∘C, Latent heat of Vaporisation = 540 kcal/kg
0.130
0.065
0.260
0.135
- It increases
- It decreases
- Remains same
- Cannot say
Which of the following statements is not correct?
A) Steam produces more severe burns on the skin than the boiling water.
B) Water at room temperature is a liquid.
C) Ice at causes less cooling than water at the same temperature.
D) We can sip hot tea from a saucer faster than from a cup.
- Water
- Steam
- Equally hot
- Cannot say
State in brief, the meaning of each of the following:
The specific latent heat of fusion of ice is .
A slab of stone of area 0.34 m2 and thickness 10 cm is exposed on the lower face to steam at 100∘ C. A block of ice at 0∘ C rests on the upper face of the slab. In one hour, 3.6 kg of ice is melted. Assume that the heat loss from the sides is negligible. The latent heat of fusion of ice is 3.4×105 J kg−1. What is the thermal conductivity of the stone in units of Js−1m−1 ∘C−1?
1.5
2.0
2.5
1.0
as the heat absorbed during vapourisation does not raises waters temp then how does it cause better burns to the skin than water at 100 C. BCZ rate of radiant heat transmission depends on the the temperature of the water
- 2.5 gm
- 2.5 kg
- 0.25 kg
- 0.25 gm