ECAT Pre General Science Physics Chapter 11 MCQ Test With Answer

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

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

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ECAT Pre General Science Physics Chapter 11 Heat & Thermodynamics

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Question # 1

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

Question # 2

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

Question # 3

A typical four stroke petrol engine undergoes how many successive processes in each cycle

Question # 4

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

Question # 5

In an adiabatic expansion, the temperature of the gas

Question # 6

In the formula P = N0KT, N0denotes:

Question # 7

If the formula PV = nRT, n denotes:

Question # 8

The curve representing an isothermal process is called

Question # 9

R.M.S velocity of a particle is V at pressure P. If pressure increases by two times, then R.M.S velocity becomes

Question # 10

The pressure exerted by the gas is

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

Energy gas behaves like an ideal gast at

Question # 15

Carnot heat engine only used

Question # 16

In case of an ideal gas, the P.E associated with its molecule is

Question # 17

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

Question # 18

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

Question # 19

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

Question # 20

The volume of a gas will be double of what it is at 0°C (pressure remaining constant) at

Question # 21

If an amount of heat enters the system it could

Question # 22

Which quantity is important in stating the entropy of the system

Question # 23

Brownian motion increases due to

Question # 24

At constant volume temperature is increased. Then

Question # 25

If a system undergoes a natural process it will go in the direction that causes the entropy of the system plus the environment to increase, this is another statement of

Question # 26

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

Question # 27

One kilogram of different substances contain

Question # 28

Which of the following is a state variable

Question # 29

Heat travels through vacuum by

Question # 30

The absolute temperature of the tripple point of water is

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 A process is a reversible process, if the entropy of the system
A. increases
B. decreases
C. remains constant
D. none of them
2 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
3 The percentage of available heat energy converted into work by a petrol engine is roughly
A. 35 %
B. 40 %
C. 35 to 40 %
D. 25 %
4 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>
5 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
6 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
7 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
8 Generally a temperature scale is established by
A. one fixed point
B. two fixed point
C. three fixed point
D. four fixed point
9 Electromagnetic waves emitted by hot bodies are called:
A. Photoelectrons
B. Alpha rays
C. Thermal radiation
D. None of these
10 The basis to define a temperature scale that is independent of material properties is provided by
A. carbon cycle
B. nitrogen cycle
C. Carnot cycle
D. irreversible cycle

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