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ECAT Physics Chapter 11 Heat & Thermodynamics Online Test
| Sr. # | Questions | Answers Choice |
|---|---|---|
| 1 | Efficiency of carnot engine is independent of the | temperature of sink temperature of source nature of the working substances none of them |
| 2 | The highest efficiency of a heat engine whose low temperature is 17°C and the high temperature is 200°C is | 70% 100% 35% 38% |
| 3 | When the temperature of source and sink of a heat engine become equal entropy change will be | Zero Max Min -ve |
| 4 | During the whole carnot cycle |
Thermal equilibrium is maintained mechanical equilibrium is maintained both the thermal and mechanical equilibriumis maintained both the thermal and mechanical equilibrium is not maintained |
| 5 | A carnot cycle consists of | One step two step three steps four steps |
| 6 | Carnot heat engine only used | isothermal processes adiabatic processes both of them none of them |
| 7 | Sadi carnot described an ideal heat engine in | 1820 1840 1860 1880 |
| 8 | We cannot utilize the heat contents of oceans and atmosphere because | there is no reservoir at the same temperature there is no reservoir at the temperature lower than any one of two there is no reservoir at the temperature higher than any one of two none of them |
| 9 | For the working of a heat engine, there must be | a source of heat at high temperature a sink at low temperature both of them none of them |
| 10 | According to the second law, which is must to produce work | a source contains a large amount of heat energy two sources at the same temperature two sources at the different temperatures a source contains a small amount of energy |
| 11 | It is impossible to devise a processes which may convert heat, extracted from a single reservoir, entirely into work without leaving any change in the working system. This is the statement of | Clausius statement of second law Kelvin'sstatement of second law Clausius statement of first law Kelvin's statement of first law |
| 12 | The percentage of available heat energy converted into work by a diesel engine is roughly | 35 %` 40 % 35 - 40 % 25 % |
| 13 | The percentage of available heat energy converted into work by a petrol engine is roughly | 35 % 40 % 35 to 40 % 25 % |
| 14 | The second law of thermodynamics is concerned with the circumstances in which | heat can be converted into work direction of flow of heat none of them both of them |
| 15 | First law of thermodynamics tells us that heat energy can be converted into equivalent amount of work, but it is silent about | how heat is absorbed how heat extracted how this conversion takes place none of them |
