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	Generally a temperature scale is established by	A. one fixed point B. two fixed point C. three fixed point D. four fixed point
2	The absolute temperature of the tripple point of water is	A. 100°C B. 4°C C. 373 K D. 273.16 K
3	The temperature scale approved in SI units is:	A. Celsius scale B. Kelvin scale C. Fehrenheit scale D. None of these
4	The internal energy of an ideal gas system is generally the	A. translational K.E of molecules B. vibrational K.E of molecules C. rotational K.E of molecules D. all of them
5	Which of the following is not an assumption of kinetic energy	A. a finite volume of gas consists of very large number of molecules B. the gas molecules are in random motion C. collision between the gas molecules are inelastic D. the size of the gas molecules is much smaller than the separation between molecules
6	Which of the following does not have the same units:	A. Work B. Heat C. Kinetic energy D. Power
7	Maximum density of H₂O is at the temperature	A. 32°F B. 39.2°F C. 42°F D. 4°F
8	In all natural processes where heat flows from one system to another, there is always a net	A. decrease in entropy B. increase in entropy C. decrease or increase in entropy D. none of them
9	The only significant motion possessed by the mono-atomic gas represented is:	A. Translatory B. Rotatory C. Vibratory D. None of these
10	If 42 J heat is transferred to the system and the work done by the system is 32 J then what will be the change in internal energy	A. 0 J B. 2 J C. 5 J D. 10 J
11	Rice takes longest to cook	A. In a submarine 100 m below the surface of the sea B. At sea level C. At Murree D. At Mount Everest
12	Triple point of water is	A. 273.16°F B. 372.16K C. 273.16°F D. 273.16
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	The example of reversible process is	A. an explosion B. changes occur suddenly C. slow compression of a gas D. all of them
15	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
16	At constant volume temperature is increased. Then	A. Collision on walls will be less B. Number of collisions per unit time will increase C. Collision will be in straight lines D. Collision will not change
17	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
18	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
19	If the volume of the gas is to be increased by 4 times, then	A. Temperature and pressure must be doubled B. At constant P the temperature must be increased by 4 times C. At constant T the pressure must be increased by four times D. It cannot be increased
20	When heat is removed from the system	A. negative B. positive C. zero D. any one of them
21	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
22	On the compression stroke of the petrol engine, the inlet value is closed and the mixture is compressed	A. adiabatically B. isothermally C. isochorcally D. isobarically
23	The percentage of available heat energy converted into work by a diesel engine is roughly	A. 35 %` B. 40 % C. 35 - 40 % D. 25 %
24	The number of translation degress of freedom for a diatomic gas is	A. 2 B. 3 C. 5 D. 6
25	Melting point of ice	A. Increases with increasing pressure B. Decreases with increasing pressure C. Is independent of pressure D. Is proportional to pressure
26	Carnot heat engine only used	A. isothermal processes B. adiabatic processes C. both of them D. none of them
27	If water in a closed bottle is taken up to the moon and opened, the water gets	A. Freeze B. Boiled C. Dissociated into O₂and H₂ D. Evaporated
28	No spark plug is needed in	A. petrol engine B. diesel engine C. both of them D. none of them
29	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
30	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

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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

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

Absolute zero is considered as that temperature at which:

Generally a temperature scale is established by using certain physical properties of a material which varies

The product of the pressure and volume of an ideal gas is

Which of the following does not have the same units:

Boyle's law is applicable in

The ideal gas law is

Good absorbers of heat are

The highest efficiency of a heat engine whose low temperature is 17°C and the high temperature is 200°C is

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

On the power stroke, a spark fires the mixtures causing a rapid increase in pressure and temperature and the burning mixture expands

Electromagnetic waves emitted by hot bodies are called:

The state in which ice, water and vapour coexists in equilibrium is called

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

A carnot cycle consists of

Heat required to raise the temperature of one mole of a gas through 1 K at constant pressure is called

According to kinetic theory of gases, molecules of a gas behave like

In a heat engine, heat is supplied by the

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

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

Average KE of a gas molecule has:

Gas constant per molecule is called:

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

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

First law of thermodynamics is consequence of conservation of

The volume of universal gas constant R is:

Maximum density of H2O is at the temperature

A gas which strictly obeys the gas laws under all conditions of temperature and pressure is called:

No spark plug is needed in

Specific heat at constant pressure is greater than the specific heat at constant volume because

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