ECAT Pre Engineering Physics Chapter 11 MCQ Test With Answer

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

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 11 Heat & Thermodynamics

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Physics ECAT Pre Engineering Chapter 11 Heat & Thermodynamics

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Question # 1

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

Question # 2

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

Question # 3

When heat is removed from the system

Question # 4

If an amount of heat enters the system it could

Question # 5

The temperature scale approved in SI units is:

Question # 6

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

Question # 7

The kinetic energy of one molecule of a gas at normal temperature and pressure will be (k = 8.31 J/mole K) :

Question # 8

Which quantity is important in stating the entropy of the system

Question # 9

The temperature of gas is produced by

Question # 10

The nature of thermal radiation is similar to:

Question # 11

If R is gas constant for 1 gram mole, Cpand Cvare specific heat for a solid then

Question # 12

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

Question # 13

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

Question # 14

The behaviour of gases is well accounted by the kinetic theory based on

Question # 15

Internal energy is the sum of all the forms of

Question # 16

It is impossible to devise a processes which may convert heat, extracted from a single reservoir, entirely into work without leaving any change in the working system. This is the statement of

Question # 17

Rate of diffusion is

Question # 18

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

Question # 19

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

Question # 20

When two objects come to common temperature, the body is said to be in:

Question # 21

The work done on the system by the environment is considered as

Question # 22

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

Question # 23

Which of the following is not thermo dynamical function?

Question # 24

The curve representing an isothermal process is called

Question # 25

The only significant motion possessed by the mono-atomic gas represented is:

Question # 26

We cannot utilize the heat contents of oceans and atmosphere because

Question # 27

If a molecule with momentum mv strikes a wall and rebound then the change in momentum will be:

Question # 28

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

Question # 29

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

Question # 30

The ideal gas law is

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Sr.# Question Answer
1 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>
2 The number of translation degress of freedom for a diatomic gas is
A. 2
B. 3
C. 5
D. 6
3 The Boltzman constant has the value
A. 1.38 x 10-23JK-1
B. 1.28 x 10-23JK-1
C. 1.38 x 10-26JK-1
D. 1.28 x 10-26JK-1
4 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
5 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
6 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
7 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
8 If a molecule with momentum mv strikes a wall and rebound then the change in momentum will be:
A. -2 mv
B. Zero
C. 2 mv
D. mv
9 The work done by the system on its environment is considered as
A. positive
B. negative
C. zero
D. any one of them
10 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

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