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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Sr.#	Question	Answer
1	At O° K which of the following properties of a gas will be zero?	A. Kinetic energy B. Potential energy C. Vibrational energy D. Density
2	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
3	The absolute temperature of the tripple point of water is	A. 100°C B. 4°C C. 373 K D. 273.16 K
4	Specific heat at constant pressure is greater than the specific heat at constant volume because	A. Heat is used up to increase temperature at constant pressure B. Heat is used by gas for expansions purposes at constant pressure C. Heat is use dup to increase internal energy D. The above statement is invalid
5	A real gas can be approximated to an ideal gas at	A. Low density B. High pressure C. High density D. Low temperature
6	In the reverse process, the working substance passes through the same stages as in the direct process and	A. thermal effects at each stage are exactly reversed B. mechanical effects at each stage are exactly reversed C. thermal and mechanical effects at each stage remain the same D. thermal and mechanical effects at each stage are exactly reversed
7	The relationship between Boltzmann constant k with R and N_Ais given as:	A. k = RN_A B. k =R/N_A C. k = NR/N_A D. None of these
8	The example of irreversible process is	A. slowly liquification B. slowly evaporation C. an explosion D. all of them
9	The process which is carried out at constant temperature is known as	A. adiabatic process B. isothermal process C. isochoric process D. none of them
10	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
11	The value of E₀in coulomb's law is:	A. 9 x 10⁹Nm²C^-2 B. 8.85 x 10^-12C²N^-1m^-2 C. 8.85 x 10^-12Nm²C^-2 D. 9 x 10⁹C²N^-1m^-2
12	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
13	No spark plug is needed in	A. petrol engine B. diesel engine C. both of them D. none of them
14	For the working of a heat engine, there must be	A. a source of heat at high temperature B. a sink at low temperature C. both of them D. none of them
15	Absolute zero is considered as that temperature at which:	A. All liquid become gases B. All gases become liquid C. Water freezes D. None of these
16	The work done by the system on its environment is considered as	A. positive B. negative C. zero D. any one of them
17	A process is a reversible process, if the entropy of the system	A. increases B. decreases C. remains constant D. none of them
18	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%
19	The nature of thermal radiation is similar to:	A. Ultraviolet rays B. Light rays C. Both of them D. None of these
20	If the ratio of densities of two gases is 1:4, then the ratio of their rates of diffusion into one another is	A. 2 : 1 B. 4 : 1 C. 1 : 4 D. 3 : 4
21	The pressure exerted by the gas is	A. directly proportional to the P.E B. inversely proportional to the P.E C. inversely proportional to the K.E D. directly proportional to the K.E
22	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:	A. Force B. Density C. Work done D. Pressure
23	The curve representing an isothermal process is called	A. adiabat B. isotherm C. fixed temperature D. none of them
24	A heat engine is that which converts	A. mechanical energy into thermal energy B. thermal energy into mechanical energy C. K.E into potential energy D. heat energy into light energy
25	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
26	In an adiabatic expansion, the temperature of the gas	A. increases B. becomes zero C. decreases D. decreases rapidly
27	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
28	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
29	The concept of entropy was introduced into the study of thermodynamics in	A. 1856 B. 1865 C. 1656 D. 1685
30	Good absorbers of heat are	A. Poor emitters B. Non emitters C. Good emitters D. Highly polarized

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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 Boltzman constant has the value

Boyle's law is applicable in

In an ideal gas, the molecules have:

Which of the following is not an assumption of kinetic energy

The internal energy of an ideal gas system is generally the

In an adiabatic expansion, the temperature of the gas

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

The example of irreversible process is

The nature of thermal radiation is similar to:

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

During the whole carnot cycle

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

The curve representing an adiabatic process is called

The internal energy of a system does not depend upon the

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

An isochoric process is one which take place at

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

Triple point of water is

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

Which of the following is a state variable

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

Rice takes longest to cook

On colliding in a closed container, the gas molecules

The earliest heat engine was

A heat engine is that which converts

Truth of kinetic energy is confirmed by:

In an adiabatic process the work is done at the expense of the

The curve representing an isothermal process is called

If an amount of heat enters the system it could

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

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