ECAT Pre Engineering Physics Chapter 11 MCQ Test With Answer

Top Scorers Of Physics ECAT Pre Engineering Chapter 11 Heat & Thermodynamics MCQ`s Test

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Sr.#	Question	Answer
1	Brownian motion increases due to	A. Increase in size of Brownian particle B. Increase in temperature of medium C. Increase in density of medium D. Increase in viscosity of medium
2	The second law of thermodynamics is concerned with the circumstances in which	A. heat can be converted into work B. direction of flow of heat C. none of them D. both of them
3	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	A. P=P/V<1/2mv²> B. P=2N/V<1/2mv²> C. P=2/3N/V<1/2mv²> D. P=2/3N/V<mv²>
4	The percentage of available heat energy converted into work by a petrol engine is roughly	A. 35 % B. 40 % C. 35 to 40 % D. 25 %
5	The state in which ice, water and vapour coexists in equilibrium is called	A. zero degree celsius B. zero degree fahrenheit C. absolute zero D. 373 K
6	Adiabatic change occurs when the gas	A. expands B. compressed C. expands or compressed D. expands or compressed rapidly
7	Maximum density of H₂O is at the temperature	A. 32°F B. 39.2°F C. 42°F D. 4°F
8	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
9	Which quantity is important in stating the entropy of the system	A. initial entropy B. final entropy C. change in entropy D. none of them
10	The number of translation degress of freedom for a diatomic gas is	A. 2 B. 3 C. 5 D. 6
11	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
12	The kinetic energy of one molecule of a gas at normal temperature and pressure will be (k = 8.31 J/mole K) :	A. 1.7 x 10³J B. 10.2 x 10³J C. 3..4 x 10³J D. 6.8 x 10³J
13	In case of an ideal gas, the P.E associated with its molecule is	A. maximum B. zero C. minimum D. not fixed
14	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
15	The rate of change of momentum of a molecule is equal to:	A. Pressure B. Work C. Density D. Force
16	While deriving equation of pressure by kinetic theory of gases, we take into account:	A. Only linear motion of molecules B. Only rotational motion C. Only vibratory motion D. All of these
17	Generally a temperature scale is established by	A. one fixed point B. two fixed point C. three fixed point D. four fixed point
18	The earliest heat engine was	A. petrol engine B. diesel engine C. electric engine D. steam engine
19	R.M.S velocity of a particle is V at pressure P. If pressure increases by two times, then R.M.S velocity becomes	A. 2V B. 3V C. 0.5V D. V
20	A typical four stroke petrol engine undergoes how many successive processes in each cycle	A. one B. two C. three D. four
21	The length of a metallic rod is 5 meter at 100°C. The coefficient of cubical expansion of the metal will be	A. 2.0 x 10^-5/°C B. 4.0x10^-5/°C C. 6.0x10^-5/°C D. 2.33x10^-5/°C
22	For the working of a heat engine, there must be	A. a source of heat at high temperature B. a sink at low temperature C. both of them D. none of them
23	In an adiabatic process the work is done at the expense of the	A. energy supplied to the system B. energy gained from the surroundings C. internal energy D. none of them
24	Which of the following is a state variable	A. entropy B. pressure C. volume D. all of them
25	A gas is compressed adiabatically till its temperature is double. The ratio of its final volume to initial volume will be	A. 1/2 B. More than 1/2 C. Less than 1/2 D. Between 1 and 2
26	If R is gas constant for 1 gram mole, C_pand C_vare specific heat for a solid then	A. C_p- C_v= R B. C_p- C_{v < R} C. C_p- C_{v = 0} D. C_p- C_{v > R}
27	First law of thermodynamic is special case of	A. Law of conservation of energy B. Charle's law C. Law of conservation of mass D. Boyle's law
28	The volume of a gas will be double of what it is at 0°C (pressure remaining constant) at	A. 546 K B. 273 K C. 546°C D. 273°C
29	An irreversible heat flow from a hot to cold substances of a system, causes the disorder to	A. decrease B. remains the same C. increase D. any one of them
30	The product of the pressure and volume of an ideal gas is	A. A constant B. Approximately equal to the universal gas constant C. Directly proportional to its temperature D. Inversely proportional to its temperature

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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

Which of the following is not thermo dynamical function?

We cannot utilize the heat contents of oceans and atmosphere because

Sadi carnot described an ideal heat engine in

Tick the correct pair when M denotes the molecular mass and other symbols carry usual meanings:

Since the absolute scale is independent of the property of the working substance, hence, can be applied at

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

In all natural processes where heat flows from one system to another, there is always a net

Real gases strictly obey gas law at:

A diatomic gas molecule has

An isochoric process is one which take place at

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

Pressure of a gas at constant volume is proportion to

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

A real gas can be approximated to an ideal gas at

During the whole carnot cycle

For the working of a heat engine, there must be

When heat is added into the system then change in entropy is

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

The work done on the system by the environment is considered as

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

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

Carnot heat engine only used

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

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

If the volume of the gas is to be increased by 4 times, then

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

Which of the following is not an assumption of kinetic energy

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

In thermodynamics, internal energy is the function of

On colliding in a closed container, the gas molecules

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