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

Consider the Process on a System Shown in Figure. During the Process, the Work Done by the System - Physics

Advertisements
Advertisements

प्रश्न

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

पर्याय

  • continuously increases

  • continuously decreases

  • first increases then decreases

  • first decreases then increases

MCQ
रिकाम्या जागा भरा
Advertisements

उत्तर

continuously increases

 

Work done by a system, `W=intPdV`

Here,

P = Pressure on the system

dV = change in volume.

Since dV is positive, i.e. the volume is continuously increasing, work done by the system also continuously increases.

shaalaa.com
Heat, Internal Energy and Work
  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 4: Laws of Thermodynamics - MCQ [पृष्ठ ६१]

APPEARS IN

एचसी वर्मा Concepts of Physics Vol. 2 [English] Class 11 and 12
पाठ 4 Laws of Thermodynamics
MCQ | Q 5 | पृष्ठ ६१

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)


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 ?


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 ______________ .


A 100 kg lock is started with a speed of 2.0 m s−1 on a long, rough belt kept fixed in a horizontal position. The coefficient of kinetic friction between the block and the belt is 0.20. (a) Calculate the change in the internal energy of the block-belt system as the block comes to a stop on the belt. (b) Consider the situation from a frame of reference moving at 2.0 m s−1 along the initial velocity of the block. As seen from this frame, the block is gently put on a moving belt and in due time the block starts moving with the belt at 2.0 m s−1. calculate the increase in the kinetic energy of the block as it stops slipping  past the belt. (c) Find the work done in this frame by the external force holding the belt.


A gas is taken along the path AB as shown in figure. If 70 cal of heat is extracted from the gas in the process, calculate the change in the internal energy of the system.


Figure shows a cylindrical tube of volume V with adiabatic walls containing an ideal gas. The internal energy of this ideal gas is given by 1.5 nRT. The tube is divided into two equal parts by a fixed diathermic wall. Initially, the pressure and the temperature are p1, T1 on the left and p2, T2 on the right. The system is left for sufficient time so that the temperature becomes equal on the two sides. (a) How much work has been done by the gas on the left part? (b) Find the final pressures on the two sides. (c) Find the final equilibrium temperature. (d) How much heat has flown from the gas on the right to the gas on the left?


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 is correct, when the energy is transferred to a system from its environment?


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


Define heat.


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


An ideal gas is compressed at a constant temperature. Its internal energy will ____________.


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 ______.


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

 


The internal energy of one mole of argon is ______.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×