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	What temperature is the same on Celsius scale as well as on Fahrenheit scale?	A. 32°C B. -32°C C. -40°C D. -212°C
2	At what temperature the adiabatic change is equivalent to the isothermal change?	A. Zero degree Celsius B. Zero Kelvin C. Critical temperature D. Above critical temperature
3	If a process cannot be retraced in the backward direction by reversing the controlling factors, it is	A. a reversible process B. an irreversible process C. any one of them D. both of them
4	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
5	The rate of change of momentum of a molecule is equal to:	A. Pressure B. Work C. Density D. Force
6	Sadi carnot described an ideal heat engine in	A. 1820 B. 1840 C. 1860 D. 1880
7	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%
8	In an adiabatic expansion, the temperature of the gas	A. increases B. becomes zero C. decreases D. decreases rapidly
9	Heat travels through vacuum by	A. Conduction B. Convection C. Radiation D. Both A and B
10	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
11	On a cold morning a metal surface will fell colder to touch than a wooden surface, because	A. Metal has high specific heat B. Metal has high thermal conductivity C. Metal has low specific heat D. Metal has low thermal conductivity
12	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
13	The work done on the system by the environment is considered as	A. positive B. negative C. zero D. any one of them
14	Tick the correct pair when M denotes the molecular mass and other symbols carry usual meanings:	A. N = nN_Am = MN_A B. n = N N_A, M = mN_A C. M = N_A/N , N_A= m/n D. N = nN_A, M = mN_A
15	Real gases strictly obey gas law at:	A. High pressure and low temperatures B. Low pressures and high temperatures C. High pressures and high temperatures D. None of these
16	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}
17	Hotness and coldness of an object is represented in terms:	A. Heat B. Temperature C. Chemical energy D. None of these
18	When two objects are rubbed together, their internal energy	A. remains same B. decreases C. remains the same then decreases D. increases
19	Internal energy is the sum of all the forms of	A. K.E B. P.E C. both of them D. none of them
20	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
21	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
22	In case of an ideal gas, the P.E associated with its molecule is	A. maximum B. zero C. minimum D. not fixed
23	First law of thermodynamics is consequence of conservation of	A. Work B. Energy C. Heat D. All of these
24	A gas which strictly obeys the gas laws under all conditions of temperature and pressure is called:	A. Ideal gas B. Inert gas C. Real gas D. None of these
25	Pressure applied at any point of gas at rest is transmitted equally to all parts of the gas. This is the statement of:	A. Newton's second law B. Pascal's law C. Carnot theorem D. Second law of thermodynamics
26	In an ideal gas, the molecules have:	A. Kinetic energy only B. Potential energy only C. Both KE and PE D. None of these
27	In a heat engine, heat is supplied by the	A. cold reservoir B. sink C. hot reservoir D. none of them
28	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
29	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
30	The temperature of gas is produced by	A. At potential energy of its molecules B. The kinetic energy of its molecules C. The attractive force between its molecules D. The repulsive force between its molecules

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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

A carnot cycle consists of

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

Rice takes longest to cook

If water in a closed bottle is taken up to the moon and opened, the water gets

During the whole carnot cycle

Carnot heat engine only used

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

At constant volume temperature is increased. Then

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

An isochoric process is one which take place at

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

When two objects are rubbed together, their internal energy

Gas constant per molecule is called:

Two samples A and B of a gas initially of the same temperature and pressure are compressed from a volume V to a volume V/2 such that A is compressed isothermally and B adiabatically. The final pressure

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

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

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

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

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

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

The pressure exerted by the gas is

The heat required to raise the temperature of one mole of the gas through 1 K at constant volume is called

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

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

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

The efficiency of diesel engine is

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

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

When heat is removed from the system

The bicycle pump provides a good example of

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