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	No spark plug is needed in	A. petrol engine B. diesel engine C. both of them D. 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	A. 70% B. 100% C. 35% D. 38%
3	In which process the condition for the application of Boyle's law on the gas is fulfilled	A. isochoric process B. adiabatic process C. isothermal process D. none of them
4	If an amount of heat enters the system it could	A. decrease the internal energy B. not change the internal energy C. increase the internal energy D. none of them
5	At the constant temperature, if the value of a given mass of a gas is double, then the density of gas becomes:	A. Double B. Remains constant C. Half D. None of these
6	If a liquid is heated in weightlessness, the heat is transmitted through	A. Conduction B. Convection C. Radiation D. Neither, because the liquid cannot be heated in weightlessness
7	The example of reversible process is	A. an explosion B. changes occur suddenly C. slow compression of a gas D. all of them
8	The nature of thermal radiation is similar to:	A. Ultraviolet rays B. Light rays C. Both of them D. None of these
9	The curve representing an isothermal process is called	A. adiabat B. isotherm C. fixed temperature D. none of them
10	The ideal gas law is	A. P = nRT B. V = nRT C. PV =RT D. PV =nRT

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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 curve representing an adiabatic process is called

10 c.c. each of oxygen and hydrogen are kept in separate flasks. Then which of the following relations is correct?

In an adiabatic process the work is done at the expense of the

In thermodynamics, internal energy is the function of

While deriving the equation for pressure of a gas we consider the

One kilogram of different substances contain

The ideal gas law is

The concept of entropy was introduced into the study of thermodynamics in

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

If the ratio of densities of two gases is 1:4, then the ratio of their rates of diffusion into one another is

Two metal rods A and B have their initial lengths in the ratio 2 : 3 and coefficients of linear expansion in the ratio 4 : 3. When they are heated through same temperature difference the ratio of their linear expansion is

Brownian motion increases due to

If the distance between two charges is doubled, the force between them will become:

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

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

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

The Boltzman constant has the value

If an amount of heat enters the system it could

An irreversible heat flow from a hot to cold substances of a system, causes the disorder to

In the theory of dimensional analysis, heat may be properly represented by:

A reversible cycle is the one in which

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

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

Pressure applied at any point of gas at rest is transmitted equally to all parts of the gas. This is the statement of:

Electromagnetic waves emitted by hot bodies are called:

On the exaust stroke, the outlet values opens. The residual gases are expelled and piston moves

A gas is compressed adiabatically till its temperature is double. The ratio of its final volume to initial volume will be

The absolute temperature of the tripple point of water is

If N is the total number of molecules and V is the volume of the container, then the expression for the pressure of gas is

The disorder in the system increases due to the

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ECAT Physics Chapter 11 Important MCQ's

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