English

Define heat.

Advertisements
Advertisements

Question

Define heat.

One Line Answer
Advertisements

Solution

Heat is the form of energy that transfers due to the temperature differences between the system and surroundings.  

shaalaa.com
  Is there an error in this question or solution?
Chapter 4: Thermodynamics - Very Short Answer

APPEARS IN

RELATED QUESTIONS

Explain why Air pressure in a car tyre increases during driving.


Should the internal energy of a system necessarily increase if heat is added to it?


A force F is applied on a block of mass M. The block is displaced through a distance d in the direction of the force. What is the work done by the force on the block? Does the internal energy change because of this work?


A closed bottle contains some liquid. the bottle is shaken vigorously for 5 minutes. It is found that the temperature of the liquid is increased. Is heat transferred to the liquid? Is work done on the liquid? Neglect expansion on heating.


An ideal gas is pumped into a rigid container having diathermic walls so that the temperature remains constant. In a certain time interval, the pressure in the container is doubled. Is the internal energy of the contents of the container also doubled in the interval ?


When a tyre bursts, the air coming out is cooler than the surrounding air. Explain.


Figure shows two processes A and B on a system. Let ∆Q1 and ∆Q2 be the heat given to the system in processes A and B respectively. Then ____________ .


Refer to figure. Let ∆U1 and ∆U2 be the changes in internal energy of the system in the process A and B. Then _____________ .


Consider the process on a system shown in figure. During the process, the work done by the system ______________ .


An ideal gas goes from the state i to the state f as shown in figure. The work done by the gas during the process ______________ .


A gas is contained in a metallic cylinder fitted with a piston. The piston is suddenly moved in to compress the gas and is maintained at this position. As time passes the pressure of the gas in the cylinder ______________ .


The pressure p and volume V of an ideal gas both increase in a process.

(a) Such a process is not possible.

(b) The work done by the system is positive.

(c) The temperature of the system must increase.

(d) Heat supplied to the gas is equal to the change in internal energy.


Figure shows three paths through which a gas can be taken from the state A to the state B. Calculate the work done by the gas in each of the three paths.


A substance is taken through the process abc as shown in figure. If the internal energy of the substance increases by 5000 J and a heat of 2625 cal is given to the system, calculate the value of J.


What is the internal energy of the system, when the amount of heat Q is added to the system and the system does not do any work during the process?


When does a system lose energy to its surroundings and its internal energy decreases? 


A cylinder containing one gram molecule of the gas was compressed adiabatically until its temperature rose from 27°C to 97°C. Calculate the work done and heat produced in the gas (𝛾 = 1.5).


The internal energy of a system is ______


In a thermodynamic system, working substance is ideal gas. Its internal energy is in the form of ______.


Two cylinders A and B of equal capacity are connected to each other via a stopcock. A contains a gas at standard temperature and pressure. B is completely evacuated. The entire system is thermally insulated. The stopcock is suddenly opened. Answer the following:

What is the final pressure of the gas in A and B?


In insulated systems, the amount of external work done by the gas is proportional to: 


If a gas is compressed adiabatically:


The molar specific heat of He at constant volume is 12.47 J/mol.K. Two moles of He are heated at constant pressure. So the rise in temperature is 10 K. Find the increase in internal energy of the gas.


A steam engine delivers 4.8 x 108 Jof work per minute and services 1.2 x 109 J of heat per minute from its boiler. What is the percentage efficiency of the engine?


What is heat?


A system releases 125 kJ of heat while 104 kJ work is done on the system. Calculate the change in internal energy.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×