Advertisements
Advertisements
प्रश्न
Read the following paragraph and answer the questions.
|
If heat is exchanged between a hot and cold object, the temperature of the cold object goes on increasing due to gain of energy and the temperature of the hot object goes on decreasing due to loss of energy. The change in temperature continues till the temperatures of both the objects attain the same value. In this process, the cold object gains heat energy and the hot object loses heat energy. If the system of both the objects is isolated from the environment by keeping it inside a heat resistant box (meaning that the energy exchange takes place between the two objects only), then no energy can flow from inside the box or come into the box. |
- Heat is transferred from where to where?
- Which principle do we learn about from this process?
- How will you state the principle briefly?
- Which property of the substance is measured using this principle?
Advertisements
उत्तर
- Heat is transferred from the object at higher temperature to the object at lower temperature.
- We learn the principle of heat exchange from this process.
- Principle of heat exchange states that the heat energy lost by hot object is always equal to heat gained by cold object provided that the system of both the objects is isolated.
- The specific heat of an object can be measured using this principle.
संबंधित प्रश्न
50 g of metal piece at 27°C requires 2400 J of heat energy so as to attain a temperature of 327°C . Calculate the specific heat capacity of the metal.
During the phase change does the average kinetic energy of the molecules of the substance increase?
Describe a method to determine the specific heat capacity of a solid, like a piece of copper ?
Explain the term boiling ?
Explain the meaning of green house effect.
State three ways to minimize the global warming.
What is carbon tax?
Without green house effect, the average temperature of earth’s surface would have been:
(a) – 18℃
(b) 33℃
(c) 0℃
(d) 15℃
A burner raises the temperature of 360 g of water from 40°C to 100°C in 5 minutes. Calculate the rate of heat supplied by the burner.
State, with reason, which of the two, boiling water or steam both at 100°C will produce more severe burns.
Water boils at 120 °C in a pressure cooker. Explain the reason.
Write two advantages of high specific heat capacity of water.
Ice-cream at 0°C feels colder than water at 0°C. Give reason for this observation.
Why are athletes advised to put on extra clothes after competing on event?
Discuss how high specific heat capacity of water helps in formation of land and sea breeze.
Derive Mayer’s relation.
Decide the unit for specific heat capacity.
Which of the substances P, Q, or R has the lowest specific heat? The temperature v/s time graph is shown ______.
Conductors have generally high specific heat capacities and insulators have low specific heat capacities.
Two blocks P and Q of different metals having their mass in the ratio 2 : 1 are given same amount of heat. Their temperature rises by same amount. Compare their specific heat capacities.
