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	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
2	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
3	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
4	Gas constant per molecule is called:	A. Universal gas constant B. Stefen's constant C. Boltzmann constant D. Gravitation constant
5	An amount of water of mass 20 g at 0°C is mixed with 40 g of water at 10°C. Final temperature of mixture is	A. -20°C B. 6.67°C C. 5°C D. 0°C
6	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
7	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
8	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
9	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
10	The heat required to raise the temperature of one mole of the substance through 1 K is called	A. heat capacity B. specific heat capacity C. molar specific heat D. all of them
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	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
13	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
14	Sadi carnot described an ideal heat engine in	A. 1820 B. 1840 C. 1860 D. 1880
15	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
16	Which of the following is not an example of adiabatic process	A. the rapid escape of air from a burst type B. the rapid expansion and compression of air through which a sound wave is passing C. cloud formation in the atmosphere D. none of them
17	According to the second law, which is must to produce work	A. a source contains a large amount of heat energy B. two sources at the same temperature C. two sources at the different temperatures D. a source contains a small amount of energy
18	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
19	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	A. 1 : 2 B. 2 : 3 C. 3 : 4 D. 8 : 9
20	While deriving the equation for pressure of a gas we consider the	A. rotational motion of molecules B. vibrational motion of molecules C. linear motion of molecules D. all of them
21	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
22	The ideal gas law is	A. P = nRT B. V = nRT C. PV =RT D. PV =nRT
23	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
24	Maximum density of H₂O is at the temperature	A. 32°F B. 39.2°F C. 42°F D. 4°F
25	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
26	Good absorbers of heat are	A. Poor emitters B. Non emitters C. Good emitters D. Highly polarized
27	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
28	Pressure of a gas at constant volume is proportion to	A. Total energy of gas B. Average P.E to molecules C. Average K.E of molecules D. Total internal energy of gas
29	The basis to define a temperature scale that is independent of material properties is provided by	A. carbon cycle B. nitrogen cycle C. Carnot cycle D. irreversible cycle
30	The rate of change of momentum of a molecule is equal to:	A. Pressure B. Work C. Density D. Force

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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 second law of thermodynamics is concerned with the circumstances in which

The efficiency of diesel engine is

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

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

The pressure of gas everywhere inside the vessel will be the same provided the gas is of

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

10 c.c. each of oxygen and hydrogen are kept in separate flasks. Then which of the following relations is correct?

Hotness and coldness of an object is represented in terms:

Truth of kinetic energy is confirmed by:

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

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

Real gases strictly obey gas law at:

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

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

We cannot utilize the heat contents of oceans and atmosphere because

When two objects are rubbed together, their internal energy

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 typical four stroke petrol engine undergoes how many successive processes in each cycle

The length of a metallic rod is 5 meter at 100°C. The coefficient of cubical expansion of the metal will be

At absolute temperature, the kinetic energy of the molecules

Which of the following is not thermo dynamical function?

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

First law of thermodynamic is special case of

Average KE of a gas molecule has:

An isochoric process is one which take place at

Pressure of a gas at constant volume is proportion to

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

What temperature is the same on Celsius scale as well as on Fahrenheit scale?

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

On colliding in a closed container, the gas molecules

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