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

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

Question # 2

Adiabatic change occurs when the gas

Question # 3

A process is a reversible process, if the entropy of the system

Question # 4

When two objects are rubbed together, their internal energy

Question # 5

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

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

In all natural processes where heat flows from one system to another, there is always a net

Question # 8

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

Question # 9

During the whole carnot cycle

Question # 10

Which of the following is a state variable

Question # 11

Which of the following does not have the same units:

Question # 12

Good absorbers of heat are

Question # 13

The percentage of available heat energy converted into work by a petrol engine is roughly

Question # 14

The bicycle pump provides a good example of

Question # 15

The disorder in the system increases due to the

Question # 16

When heat is removed from the system

Question # 17

The percentage of available heat energy converted into work by a diesel engine is roughly

Question # 18

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

Question # 19

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 # 20

A process in which no heat enters or leaves the system is called

Question # 21

10 c.c. each of oxygen and hydrogen are kept in separate flasks. Then which of the following relations is correct?

Question # 22

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

Question # 23

At constant temperature, on increasing the pressure of a gas by 5%, its volume. The final temperature of the gas will be

Question # 24

Which quantity is important in stating the entropy of the system

Question # 25

Pressure applied at any point of gas at rest is transmitted equally to all parts of the gas. This is the statement of:

Question # 26

If the formula PV = nRT, n denotes:

Question # 27

A heat engine is that which converts

Question # 28

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

Question # 29

In the reverse process, the working substance passes through the same stages as in the direct process and

Question # 30

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

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 If the formula PV = nRT, n denotes:
A. Number of molecules per unit volume
B. Number of moles
C. Number of molecules
D. None of these
2 The kinetic energy of one molecule of a gas at normal temperature and pressure will be (k = 8.31 J/mole K) :
A. 1.7 x 103J
B. 10.2 x 103J
C. 3..4 x 103J
D. 6.8 x 103J
3 In a heat engine, heat is supplied by the
A. cold reservoir
B. sink
C. hot reservoir
D. none of them
4 An amount of water of mass 20 g at 0°C is mixed with 40 g of water at 10°C. Final temperature of mixture is
A. -20°C
B. 6.67°C
C. 5°C
D. 0°C
5 For making cooking utensils, which of the following pairs of properties is most suited?
A. Low specific heat and high conductivity
B. Low specific heat and low conductivity
C. High specific heat and high conductivity
D. High specific heat and low conductivity
6 When the temperature of source and sink of a heat engine become equal entropy change will be
A. Zero
B. Max
C. Min
D. -ve
7 Which of the following is a state variable
A. entropy
B. pressure
C. volume
D. all of them
8 Generally a temperature scale is established by using certain physical properties of a material which varies
A. nonlinearly with temperature
B. linearly with temperature
C. either of them
D. none of them
9 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
10 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

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