Physics ECAT Pre Engineering MCQ's Test For Full Book With Answers

Physics ECAT Pre Engineering MCQ's Test For Full Book

Sr. # Questions Answers Choice
1 Sadi carnot described an ideal heat engine in 1820 1840 1860 1880
2 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
3 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
4 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
5 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
6 The percentage of available heat energy converted into work by a diesel engine is roughly 35 %` 40 % 35 - 40 % 25 %
7 The percentage of available heat energy converted into work by a petrol engine is roughly 35 % 40 % 35 to 40 % 25 %
8 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
9 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
10 In a heat engine, heat is supplied by the cold reservoir sink hot reservoir none of them
11 The earliest heat engine was petrol engine diesel engine electric engine steam engine
12 A heat engine is that which converts mechanical energy into thermal energy thermal energy into mechanical energy K.E into potential energy heat energy into light energy
13 The example of irreversible process is slowly liquification slowly evaporation an explosion all of them
14 The example of reversible process is an explosion changes occur suddenly slow compression of a gas all of them
15 If a process cannot be retraced in the backward direction by reversing the controlling factors, it is a reversible process an irreversible process any one of them both of them
16 A reversible cycle is the one in which some of the changes are reversible all of the changes are reversible all of the changes are irreversible none of them
17 A succession of events which bring the system back to its initial condition is called reversible process irreversible process a cycle none of them
18 In the reverse process, the working substance passes through the same stages as in the direct process and thermal effects at each stage are exactly reversed mechanical effects at each stage are exactly reversed thermal and mechanical effects at each stage remain the same thermal and mechanical effects at each stage are exactly reversed
19 A process which can be retraced in exactly reverse order, without producing any change in the surroundings is called reversible process irreversible process any one of them none of them
20 Heat required to raise the temperature of one mole of a gas through 1 K at constant pressure is called heat capacity specific heat capacity specific heat at constant volume specific heat at constant pressure
21 The heat required to raise the temperature of one mole of the gas through 1 K at constant volume is called heat capacity specific heat capacity molar specific heat molar specific heat at constant volume
22 The heat required to raise the temperature of one mole of the substance through 1 K is called heat capacity specific heat capacity molar specific heat all of them
23 One mole of any substance contain same number of molecules different number of molecules may be same or different none of them
24 One kilogram of different substances contain same number of molecules different number of molecules may be same or different none of them
25 The curve representing an adiabatic process is called isotherm adiabat adiable none of them
26 Which of the following is not an example of adiabatic process the rapid escape of air from a burst type the rapid expansion and compression of air through which a sound wave is passing cloud formation in the atmosphere none of them
27 Adiabatic change occurs when the gas expands compressed expands or compressed expands or compressed rapidly
28 In an adiabatic expansion, the temperature of the gas increases becomes zero decreases decreases rapidly
29 In an adiabatic process the work is done at the expense of the energy supplied to the system energy gained from the surroundings internal energy none of them
30 A process in which no heat enters or leaves the system is called isochoric process isothermal process adiabatic process none of them
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