MDCAT Physics Chapter 5 Thermodynamics Online Test With Answers

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MDCAT Physics Chapter 5 Thermodynamics Online Test

Sr. # Questions Answers Choice
1 Most motorbikes have ____________ cylinder/s engine but cars usually have _________ cylinders on the same crankshaft. Four , Six One , four two , five None of these
2 No of spark plugs needed in diesel engine is: Four Five Six None of these
3 A certain engine coverts 20% of available heat energy into work. Then its efficiency will be: 20% 80% 50% None of these
4 Diesel engine coverts ____________ of available heat energy into work. 20% to 25% 25% to 30% 30% to 35% 35% to 40%
5 Petrol engine coverts ____________ of available heat energy into work. 20% to 25% 25% to 30% 30% to 35% 35% to 40%
6 One degree of thermodynamics scale of temperature is called: Celsius Fahrenheit Kelvin Radian
7 The efficiency of a practical heat engine: Can be 100% Can not be 100% Is always Zero None of these
8 Carnot engine is ____________ heat engine. A reversible An irreversible An ideal Both A and C
9 If temperature of the sink is decreased, efficiency of a carnot engine. Remains constant Decreases Increases None of these
10 What will be efficiency of carnot engine when it is operated between the temperatures 47oC and 127 oC: Reversible Irreversible Sometimes A and B None of these
11 The ratio of output work per cycle to input energy per cycle is called: Entropy Internal energy Efficiency None of these
12 As the working substance of a heat engine completes a cycle, there is no change in: Internal energy Pressure Volume All of these
13 The law of thermodynamics which discusses the condition under which heat energy is converted into and equivalent amount of work is: 1st 2nd 3rd None of these
14 Steam engine is: An optical system A thermal system A thermodynamic system None of these
15 If the temperature difference between hot and cold body is greater the heat engine is: Not efficient Less efficient More efficient NOne of above
16 If Cvdonotes molar specific heat at constant volume and𝜟 T is the change in temperature, then Cv𝜟T gives: Volume Pressure Energy Entropy
17 A process in which no heat enters or leaves the system is called. Adiabatic process Isothermal process Isochoric process None of these
18 The equation PVr = Constant applies to: Isothermal process Adiabatic process Isobaric process None of these
19 A process which is carried at constant temperature and Boyle's law can be applied is called: Adiabatic process Isothermal process Isochoric process None of these
20 The equation W = ________𝜟U represents: Thermal process adiabatic process Isobaric process None of these
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