मराठी
कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान इयत्ता ११

Consider the Following Two Statements. (A) If Heat is Added to a System, Its Temperature Must Increase. (B) If Positive Work is Done by a System in a Thermodynamic Process, Its Volume Must Increase.

Advertisements
Advertisements

प्रश्न

Consider the following two statements.

(A) If heat is added to a system, its temperature must increase.

(B) If positive work is done by a system in a thermodynamic process, its volume must increase.

पर्याय

  • Both A and B are correct

  • A is correct but B is wrong

  • B is correct but A is wrong

  • Both A and B are wrong

MCQ
Advertisements

उत्तर

B is correct but A is wrong

 

If heat is added to a system in an isothermal process, then there'll be no change in the temperature.

Work done by system, ΔW = P Δ V

⇒ ΔW = Positive ⇒ ΔV = Positive

Here,

P = Pressure

ΔV = change in volume

shaalaa.com
  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 26: Laws of Thermodynamics - MCQ [पृष्ठ ६१]

APPEARS IN

एचसी वर्मा Concepts of Physics Volume 1 and 2 [English]
पाठ 26 Laws of Thermodynamics
MCQ | Q 6 | पृष्ठ ६१

संबंधित प्रश्‍न

A steam engine delivers 5.4×10J of work per minute and services 3.6 × 10J of heat per minute from its boiler. What is the efficiency of the engine? How much heat is wasted per minute?


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?


Can work be done by a system without changing its volume?


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.


A mixture of fuel and oxygen is burned in a constant-volume chamber surrounded by a water bath. It was noticed that the temperature of water is increased during the process. Treating the mixture of fuel and oxygen as the system,

  1. Has heat been transferred?
  2. Has work been done?
  3. What is the sign of ∆U?

Which of the following system freely allows the exchange of energy and matter with its environment? 


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 system releases 100 kJ of heat while 80 kJ of work is done on the system. Calculate the change in internal energy.


Explain given cases related to energy transfer between the system and surrounding –

  1. energy transferred (Q) > 0
  2. energy transferred (Q) < 0
  3. energy transferred (Q) = 0 

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).


derive the relation between the change in internal energy (∆U), work is done (W), and heat (Q). 


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 change in the temperature of the gas?


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


n mole of a perfect gas undergoes a cyclic process ABCA (see figure) consisting of the following processes:

A `→` B: Isothermal expansion at temperature T so that the volume is doubled from V1 to V2 = 2V1 and pressure changes from P1 to P2.

B `→` C: Isobaric compression at pressure P2 to initial volume V1.

C `→` A: Isochoric change leading to change of pressure from P2 to P1.

Total workdone in the complete cycle ABCA is ______.


An expansion process on a diatomic ideal gas (Cv = 5/2 R), has a linear path between the initial and final coordinates on a pV diagram. The coordinates of the initial state are: the pressure is 300 kPa, the volume is 0.08 m3 and the temperature is 390 K. The final pressure is 90 kPa and the final temperature s 320 K. The change in the internal energy of the gas, in SI units, is closest to:


A cyclic process ABCA is shown in the V-T diagram. A process on the P-V diagram is ______.

 


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?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×