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	First law of thermodynamics tells us that heat energy can be converted into equivalent amount of work, but it is silent about	A. how heat is absorbed B. how heat extracted C. how this conversion takes place D. none of them
2	At constant temperature, on increasing the pressure of a gas by 5%, its volume. The final temperature of the gas will be	A. 81 K B. 355 K C. 627 K D. 627°C
3	The ideal gas law is	A. P = nRT B. V = nRT C. PV =RT D. PV =nRT
4	Electromagnetic waves emitted by hot bodies are called:	A. Photoelectrons B. Alpha rays C. Thermal radiation D. None of these
5	We cannot utilize the heat contents of oceans and atmosphere because	A. there is no reservoir at the same temperature B. there is no reservoir at the temperature lower than any one of two C. there is no reservoir at the temperature higher than any one of two D. none of them
6	In thermodynamics, internal energy is the function of	A. temperature B. pressure C. state D. none of them
7	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
8	Truth of kinetic energy is confirmed by:	A. Diffusion of gases B. Brownian motion C. Both A and B D. None of these
9	The example of reversible process is	A. an explosion B. changes occur suddenly C. slow compression of a gas D. all of them
10	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	A. 0°C B. 10°C C. 17°C D. 20°C

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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

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

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

During the whole carnot cycle

A succession of events which bring the system back to its initial condition is called

The rate of change of momentum of a molecule is equal to:

Generally a temperature scale is established by

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

A process is a reversible process, if the entropy of the system

The bicycle pump provides a good example of

The heat required to raise the temperature of one mole of the substance through 1 K is called

Pressure of a gas at constant volume is proportion to

A diatomic gas molecule has

At the constant temperature, if the value of a given mass of a gas is double, then the density of gas becomes:

R.M.S velocity of a particle is V at pressure P. If pressure increases by two times, then R.M.S velocity becomes

The nature of thermal radiation is similar to:

We cannot utilize the heat contents of oceans and atmosphere because

At constant temperature, if the density of the gas is increased, its pressure will:

For the working of a heat engine, there must be

If a liquid is heated in weightlessness, the heat is transmitted through

Pressure exerted by a gas is

The internal energy of an ideal gas system is generally the

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

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

The second law of thermodynamics is concerned with the circumstances in which

Internal energy is the sum of all the forms of

A heat engine is that which converts

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

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

On the compression stroke of the petrol engine, the inlet value is closed and the mixture is compressed

In case of an ideal gas, the P.E associated with its molecule is

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ECAT Physics Chapter 11 Important MCQ's

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