ECAT Pre Engineering Physics Chapter 11 MCQ Test With Answer

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ECAT Physics Chapter 11 Important MCQ's

Sr.#	Question	Answer
1	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	A. Clausius statement of second law B. Kelvin'sstatement of second law C. Clausius statement of first law D. Kelvin's statement of first law
2	When two objects come to common temperature, the body is said to be in:	A. Static equilibrium B. Dynamic equilibrium C. Thermal equilibrium D. None of these
3	At constant temperature, if the density of the gas is increased, its pressure will:	A. One kg of a substance B. Unit volume of a substance C. One mole of a substance D. None of these
4	The unit of thermodynamical scale is	A. centigrade B. fahrenheit C. kelvin D. none of them
5	An isochoric process is one which take place at	A. Constant internal energy B. Constant entropy C. Constant volume D. Constant pressure
6	A typical four stroke petrol engine undergoes how many successive processes in each cycle	A. one B. two C. three D. four
7	Average KE of a gas molecule has:	A. Direct relation with absolute temperature and inverse relation with pressure B. Direction relation with both absolute temperature and pressure C. Inverse relation with both absolute temperature and pressure D. None of these
8	One mole of any substance contain	A. same number of molecules B. different number of molecules C. may be same or different D. none of them
9	Hydrogen and helium of same volume V at same temperature T and same pressure P are mixed to have same volume V. The resulting pressure of the mixtures will be	A. R/2 B. P C. 2P D. Depending on the relative mass of the gases
10	On colliding in a closed container, the gas molecules	A. Transfer momentum to the walls B. Momentum becomes zero C. Move in opposite directions D. Perform Brownian motion

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ECAT Pre Engineering Physics Chapter 11 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 11 Heat & Thermodynamics

Physics ECAT Pre Engineering Chapter 11 Heat & Thermodynamics

The disorder in the system increases due to the

First law of thermodynamics tells us that heat energy can be converted into equivalent amount of work, but it is silent about

No spark plug is needed in

An isochoric process is one which take place at

Amount of heat required to raise the temperature of a body through 1 K is called its

A gas which strictly obeys the gas laws under all conditions of temperature and pressure is called:

At constant temperature, on increasing the pressure of a gas by 5%, its volume. The final temperature of the gas will be

The internal energy of a system does not depend upon the

If R is gas constant for 1 gram mole, Cpand Cvare specific heat for a solid then

At what temperature the adiabatic change is equivalent to the isothermal change?

Pressure of a gas at constant volume is proportion to

The coefficient of linear expansion of iron is 0.000011 per°K. An iron rod is 10 metre long at 27°C. The length of the rod will be decreased by 1.1 mm when the temperature of the rod changes to

Average KE of a gas molecule has:

The earliest heat engine was

The temperature scale approved in SI units is:

The pressure of gas everywhere inside the vessel will be the same provided the gas is of

Generally a temperature scale is established by using certain physical properties of a material which varies

The example of reversible process is

In the reverse process, the working substance passes through the same stages as in the direct process and

Melting point of ice

The number of translation degress of freedom for a diatomic gas is

The percentage of available heat energy converted into work by a petrol engine is roughly

The volume of a gas will be double of what it is at 0°C (pressure remaining constant) at

The efficiency of petrol engine is usually not more than 25% to 30% because of

The kinetic energy of one molecule of a gas at normal temperature and pressure will be (k = 8.31 J/mole K) :

The unit of thermodynamical scale is

If a process cannot be retraced in the backward direction by reversing the controlling factors, it is

The efficiency of carnot engine cannot be 100% or one unless cold reservoir is at

A reversible cycle is the one in which

If a molecule with momentum mv strikes a wall and rebound then the change in momentum will be:

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ECAT Physics Chapter 11 Important MCQ's

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Bilal A Munir

If R is gas constant for 1 gram mole, C_pand C_vare specific heat for a solid then