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	Electromagnetic waves emitted by hot bodies are called:	A. Photoelectrons B. Alpha rays C.Thermal radiation D. None of these
2	A succession of events which bring the system back to its initial condition is called	A. reversible process B. irreversible process C.a cycle D. none of them
3	Energy gas behaves like an ideal gast at	A. High temperature and low pressure B. Low temperature and high pressure C.Both A and B D. None
4	A process is a reversible process, if the entropy of the system	A. increases B. decreases C.remains constant D. none of them
5	The concept of entropy was introduced into the study of thermodynamics in	A. 1856 B. 1865 C.1656 D. 1685
6	Specific heat at constant pressure is greater than the specific heat at constant volume because	A. Heat is used up to increase temperature at constant pressure B. Heat is used by gas for expansions purposes at constant pressure C.Heat is use dup to increase internal energy D. The above statement is invalid
7	Efficiency of carnot engine is independent of the	A. temperature of sink B. temperature of source C.nature of the working substances D. none of them
8	Melting point of ice	A. Increases with increasing pressure B. Decreases with increasing pressure C.Is independent of pressure D. Is proportional to pressure
9	If a molecule with momentum mv strikes a wall and rebound then the change in momentum will be:	A. -2 mv B. Zero C.2 mv D. mv
10	During the whole carnot cycle	A. Thermal equilibrium is maintained B. mechanical equilibrium is maintained C.both the thermal and mechanical equilibriumis maintained D. both the thermal and mechanical equilibrium is not maintained
11	In thermodynamics, internal energy is the function of	A. temperature B. pressure C.state D. none of them
12	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
13	According to kinetic theory of gases, molecules of a gas behave like	A. Inelastic spheres B. Perfectly elastic rigid sphere C.Perfectly elastic non-rigid spheres D. Inelastic non-rigid spheres
14	In the study of thermodynamics, which gas is considered as the working substance	A. real gas B. ideal gas C.any gas may be ideal or real D. none of them
15	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}
16	In an adiabatic expansion, the temperature of the gas	A. increases B. becomes zero C.decreases D. decreases rapidly
17	The bicycle pump provides a good example of	A. first law of thermodynamics B. second law of thermodynamics C.third law of thermodynamics D. none of them
18	In a heat engine, heat is supplied by the	A. cold reservoir B. sink C.hot reservoir D. none of them
19	An isochoric process is one which take place at	A. Constant internal energy B. Constant entropy C.Constant volume D. Constant pressure
20	Amount of heat required to raise the temperature of a body through 1 K is called its	A. Specific heat B. Water equivalent C.Thermal capacity D. Entropy
21	Triple point of water is	A. 273.16°F B. 372.16K C.273.16°F D. 273.16
22	The efficiency of carnot engine cannot be 100% or one unless cold reservoir is at	A. 100 K B. 273 K C.0 K D. -273 K
23	The volume of given mass of a gas will be doubled at atmosphere pressure if the temperature of the gas is changed from 150°C to	A. 300°C B. 573°C C.600°C D. 743°C
24	A typical four stroke petrol engine undergoes how many successive processes in each cycle	A. one B. two C.three D. four
25	The example of reversible process is	A. an explosion B. changes occur suddenly C.slow compression of a gas D. all of them
26	10 c.c. each of oxygen and hydrogen are kept in separate flasks. Then which of the following relations is correct?	A. Each have same number of molecules B. Don't have same number of molecules C.Can't be predicted D. None
27	Boyle's law is applicable in	A. Isochoric process B. Isothermal process C.Isobaric process D. Isotonic process
28	For making cooking utensils, which of the following pairs of properties is most suited?	A. Low specific heat and high conductivity B. Low specific heat and low conductivity C.High specific heat and high conductivity D. High specific heat and low conductivity
29	In the reverse process, the working substance passes through the same stages as in the direct process and	A. thermal effects at each stage are exactly reversed B. mechanical effects at each stage are exactly reversed C.thermal and mechanical effects at each stage remain the same D. thermal and mechanical effects at each stage are exactly reversed
30	The disorder in the system increases due to the	A. removal of heat B. addition of heat C.removal or addition of heat D. none of them

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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 nature of thermal radiation is similar to:

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

One kilogram of different substances contain

The pressure exerted by the gas is

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

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

The earliest heat engine was

One mole of any substance contain

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

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

A carnot cycle consists of

The bicycle pump provides a good example of

At O° K which of the following properties of a gas will be zero?

First law of thermodynamic is special case of

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

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

If denotes the total number of molecules in cubic vessel such that m is mass of each milecule and I is length of each side of vessel, then mN/I3gives the:

At absolute temperature, the kinetic energy of the molecules

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

When the temperature of source and sink of a heat engine become equal entropy change will be

The internal energy of a system does not depend upon the

No spark plug is needed in

The curve representing an isothermal process is called

Generally a temperature scale is established by

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

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

If a system undergoes a natural process it will go in the direction that causes the entropy of the system plus the environment to increase, this is another statement of

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 diatomic gas molecule has

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

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If denotes the total number of molecules in cubic vessel such that m is mass of each milecule and I is length of each side of vessel, then mN/I³gives the: