ECAT Pre Computer Science Chapter 11 MCQ Test With Answer

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

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

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ECAT Physics Chapter 11 Heat & Thermodynamics

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Question # 1

Adiabatic change occurs when the gas

Question # 2

According to kinetic theory of gases, molecules of a gas behave like

Question # 3

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

Question # 4

The example of reversible process is

Question # 5

The ideal gas law is

Question # 6

The internal energy of an ideal gas system is generally the

Question # 7

Brownian motion increases due to

Question # 8

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

Question # 9

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 # 10

Boyle's law is applicable in

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

The efficiency of diesel engine is

Question # 15

In a heat engine, heat is supplied by the

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Sr.# Question Answer
1 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 %
2 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
3 No spark plug is needed in
A. petrol engine
B. diesel engine
C. both of them
D. none of them
4 When heat is removed from the system
A. negative
B. positive
C. zero
D. any one of them
5 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
6 Hotness and coldness of an object is represented in terms:
A. Heat
B. Temperature
C. Chemical energy
D. None of these
7 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
8 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
9 An irreversible heat flow from a hot to cold substances of a system, causes the disorder to
A. decrease
B. remains the same
C. increase
D. any one of them
10 If a liquid is heated in weightlessness, the heat is transmitted through
A. Conduction
B. Convection
C. Radiation
D. Neither, because the liquid cannot be heated in weightlessness

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