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महाराष्ट्र राज्य शिक्षण मंडळएचएससी विज्ञान (सामान्य) इयत्ता १२ वी

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

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प्रश्न

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

पर्याय

  • Closed

  • Isolated

  • Open

  • partially closed

MCQ
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उत्तर

Open

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  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 4: Thermodynamics - MCQ’s

संबंधित प्रश्‍न

In changing the state of a gas adiabatically from an equilibrium state to another equilibrium state B, an amount of work equal to 22.3 J is done on the system. If the gas is taken from state to via a process in which the net heat absorbed by the system is 9.35 cal, how much is the net work done by the system in the latter case? (Take 1 cal = 4.19 J)


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?


The outer surface of a cylinder containing a gas is rubbed vigorously by a polishing machine. The cylinder and its gas become warm. Is the energy transferred to the gas heat or work?


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


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


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 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.


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 taken through a cyclic process ABCA as shown in figure. If 2.4 cal of heat is given in the process, what is the value of J ?


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?

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


Explain the different ways through which the internal energy of the system can be changed. 


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 ______.


8 m3 of a gas is heated at the pressure 105 N/m2 until its volume increases by 10%. Then, the external work done by the gas is ____________.


When 1 g of water at 0° C and 1 x 105 N/m2 pressure is converted into ice of volume 1.082 cm3, the external work done will be ____________.


Which of the following represents isothermal process?


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?


A person of mass 60 kg wants to lose 5kg by going up and down a 10 m high stairs. Assume he burns twice as much fat while going up than coming down. If 1 kg of fat is burnt on expending 7000 kilo calories, how many times must he go up and down to reduce his weight by 5 kg?


In thermodynamics, heat and work are ______.


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

 


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.


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