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

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Sr.#	Question	Answer
1	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
2	Carnot heat engine only used	A. isothermal processes B. adiabatic processes C. both of them D. none of them
3	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
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	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
6	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
7	One mole of any substance contain	A. same number of molecules B. different number of molecules C. may be same or different D. none of them
8	The number of translation degress of freedom for a diatomic gas is	A. 2 B. 3 C. 5 D. 6
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	The coefficient of linear expansion of iron is 0.000011 per°K. An iron rod is 10 metre long at 27°C. The length of the rod will be decreased by 1.1 mm when the temperature of the rod changes to	A. 0°C B. 10°C C. 17°C D. 20°C
11	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
12	The nature of thermal radiation is similar to:	A. Ultraviolet rays B. Light rays C. Both of them D. None of these
13	The work done on the system by the environment is considered as	A. positive B. negative C. zero D. any one of them
14	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	A. A greater than than of B B. A is equal to that of B C. A is less than that of B D. A is twice the pressure of B
15	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
16	The length of a metallic rod is 5 meter at 100°C. The coefficient of cubical expansion of the metal will be	A. 2.0 x 10^-5/°C B. 4.0x10^-5/°C C. 6.0x10^-5/°C D. 2.33x10^-5/°C
17	Which of the following is a state variable	A. entropy B. pressure C. volume D. all of them
18	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
19	The example of reversible process is	A. an explosion B. changes occur suddenly C. slow compression of a gas D. all of them
20	The concept of entropy was introduced into the study of thermodynamics in	A. 1856 B. 1865 C. 1656 D. 1685
21	What temperature is the same on Celsius scale as well as on Fahrenheit scale?	A. 32°C B. -32°C C. -40°C D. -212°C
22	Internal energy is the sum of all the forms of	A. K.E B. P.E C. both of them D. none of them
23	A process in which no heat enters or leaves the system is called	A. isochoric process B. isothermal process C. adiabatic process D. none of them
24	Heat travels through vacuum by	A. Conduction B. Convection C. Radiation D. Both A and B
25	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
26	One kilogram of different substances contain	A. same number of molecules B. different number of molecules C. may be same or different D. none of them
27	In an adiabatic expansion, the temperature of the gas	A. increases B. becomes zero C. decreases D. decreases rapidly
28	We cannot utilize the heat contents of oceans and atmosphere because	A. there is no reservoir at the same temperature B. there is no reservoir at the temperature lower than any one of two C. there is no reservoir at the temperature higher than any one of two D. none of them
29	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
30	The temperature scale approved in SI units is:	A. Celsius scale B. Kelvin scale C. Fehrenheit scale D. None of these

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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

When heat is removed from the system

The efficiency of carnot engine cannot be 100% or one unless cold reservoir is at

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

The nature of thermal radiation is similar to:

During the whole carnot cycle

We cannot utilize the heat contents of oceans and atmosphere because

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

The heat required to raise the temperature of one mole of the gas through 1 K at constant volume is called

If an amount of heat enters the system it could

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

An isochoric process is one which take place at

In a heat engine, heat is supplied by the

In the study of thermodynamics, which gas is considered as the working substance

At what temperature the adiabatic change is equivalent to the isothermal change?

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

One kilogram of different substances contain

First law of thermodynamics is consequence of conservation of

The internal energy of an ideal gas system is generally the

Energy gas behaves like an ideal gast at

A reversible cycle is the one in which

If a liquid is heated in weightlessness, the heat is transmitted through

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:

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

Brownian motion increases due to

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

Pressure of a gas at constant volume is proportion to

Which of the following is a state variable

The earliest heat engine was

On colliding in a closed container, the gas molecules

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