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	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
2	If the formula PV = nRT, n denotes:	A. Number of molecules per unit volume B. Number of moles C. Number of molecules D. None of these
3	When heat is removed from the system	A. negative B. positive C. zero D. any one of them
4	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
5	The absolute temperature for an ideal gas is	A. directly proportional to the rotational K.E of gas molecules B. directly proportional to the vibrational K.E of gas molecules C. directly proportional to the average translational K.E.of gas molecules D. directly proportional to the P.E. of gas molecules
6	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
7	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
8	Triple point of water is	A. 273.16°F B. 372.16K C. 273.16°F D. 273.16
9	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
10	In case of an ideal gas, the P.E associated with its molecule is	A. maximum B. zero C. minimum D. not fixed
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 internal energy of a system does not depend upon the	A. initial state of the system B. final state of the system C. path D. none of them
13	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
14	Which of the following is a state variable	A. entropy B. pressure C. volume D. all of them
15	Pressure exerted by a gas is	A. Independent of density of the gas B. Inversely proportional to the density of the gas C. Directly proportional to the square of the density of the gas D. Directly proportional to the density of the gas
16	Adiabatic change occurs when the gas	A. expands B. compressed C. expands or compressed D. expands or compressed rapidly
17	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	A. R/2 B. P C. 2P D. Depending on the relative mass of the gases
18	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
19	In an ideal gas, the molecules have:	A. Kinetic energy only B. Potential energy only C. Both KE and PE D. None of these
20	A process which can be retraced in exactly reverse order, without producing any change in the surroundings is called	A. reversible process B. irreversible process C. any one of them D. none of them
21	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>
22	In an adiabatic expansion, the temperature of the gas	A. increases B. becomes zero C. decreases D. decreases rapidly
23	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
24	Rate of diffusion is	A. Faster in solids than in liquids and gases B. Faster in liquids than in solids and gases C. Equal to solids, liquids and gases D. Faster in gases than in liquids and solids
25	A reversible cycle is the one in which	A. some of the changes are reversible B. all of the changes are reversible C. all of the changes are irreversible D. none of them
26	First law of thermodynamics is consequence of conservation of	A. Work B. Energy C. Heat D. All of these
27	The work done on the system by the environment is considered as	A. positive B. negative C. zero D. any one of them
28	The number of translation degress of freedom for a diatomic gas is	A. 2 B. 3 C. 5 D. 6
29	The motion of molecules in gases is:	A. Orderly B. Random C. Circular D. All of these
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

Rate of diffusion is

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

When two objects are rubbed together, their internal energy

In thermodynamics, internal energy is the function of

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

In an ideal gas, the molecules have:

The curve representing an isothermal process is called

At constant temperature, if the density of the gas is increased, its pressure will:

The absolute temperature for an ideal gas is

The relationship between Boltzmann constant k with R and NAis given as:

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

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

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

If the distance between two charges is doubled, the force between them will become:

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

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

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

One mole of any substance contain

For the working of a heat engine, there must be

On the compression stroke of the petrol engine, the inlet value is closed and the mixture is compressed

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:

Triple point of water is

The curve representing an adiabatic process is called

Average KE of a gas molecule has:

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

While deriving equation of pressure by kinetic theory of gases, we take into account:

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

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

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

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The relationship between Boltzmann constant k with R and N_Ais given as:

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: