ECAT Pre General Science Chapter 11 online mcq test with answers for Physics chapter 11 (Heart & Thermodynamics)

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Mohsin rajput Rajput 21 - Sep - 2025 06 Min 38 Sec 9/30
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ECAT Physics Chapter 11 Important MCQ's

Sr.#	Question	Answer
1	The efficiency of petrol engine is usually not more than 25% to 30% because of	A. friction B. heat losses C. both of them D. none of them
2	Which of the following is not thermo dynamical function?	A. Enthalpy B. Work done C. Gibb's energy D. Internal energy
3	When heat is added into the system then change in entropy is	A. negative B. positive C. zero D. any one of them
4	Good absorbers of heat are	A. Poor emitters B. Non emitters C. Good emitters D. Highly polarized
5	The curve representing an adiabatic process is called	A. isotherm B. adiabat C. adiable D. none of them
6	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
7	The curve representing an isothermal process is called	A. adiabat B. isotherm C. fixed temperature D. none of them
8	In an adiabatic process the work is done at the expense of the	A. energy supplied to the system B. energy gained from the surroundings C. internal energy D. none of them
9	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
10	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

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ECAT Pre General Science Physics Chapter 11 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 11 Heat & Thermodynamics

ECAT Pre General Science Physics Chapter 11 Heat & Thermodynamics

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

Internal energy is the sum of all the forms of

A real gas can be approximated to an ideal gas at

When heat is removed from the system

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

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

Electromagnetic waves emitted by hot bodies are called:

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

A diatomic gas molecule has

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

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:

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

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

On the exaust stroke, the outlet values opens. The residual gases are expelled and piston moves

For making cooking utensils, which of the following pairs of properties is most suited?

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

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

The temperature scale approved in SI units is:

Pressure exerted by a gas is

The disorder in the system increases due to the

A succession of events which bring the system back to its initial condition is called

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

If an amount of heat enters the system it could

The volume of universal gas constant R is:

Energy gas behaves like an ideal gast at

Brownian motion increases due to

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

According to the second law, which is must to produce work

In which process the condition for the application of Boyle's law on the gas is fulfilled

We can express the work in term of

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ECAT Physics Chapter 11 Important MCQ's

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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: