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

First law of thermodynamics is consequence of conservation of

Question # 2

In an adiabatic expansion, the temperature of the gas

Question # 3

Heat required to raise the temperature of one mole of a gas through 1 K at constant pressure is called

Question # 4

A reversible cycle is the one in which

Question # 5

The pressure of gas everywhere inside the vessel will be the same provided the gas is of

Question # 6

When heat is removed from the system

Question # 7

A real gas can be approximated to an ideal gas at

Question # 8

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 # 9

Which of the following is not an example of adiabatic process

Question # 10

The unit of thermodynamical scale is

Question # 11

On colliding in a closed container, the gas molecules

Question # 12

When heat is added into the system then change in entropy is

Question # 13

Rice takes longest to cook

Question # 14

On the compression stroke of the petrol engine, the inlet value is closed and the mixture is compressed

Question # 15

On a cold morning a metal surface will fell colder to touch than a wooden surface, because

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Sr.# Question Answer
1 We can express the work in term of
A. directly measurable variables
B. indirectly measurable variables
C. either of them
D. both of them
2 Amount of heat required to raise the temperature of a body through 1 K is called its
A. Specific heat
B. Water equivalent
C. Thermal capacity
D. Entropy
3 Pressure applied at any point of gas at rest is transmitted equally to all parts of the gas. This is the statement of:
A. Newton's second law
B. Pascal's law
C. Carnot theorem
D. Second law of thermodynamics
4 Adiabatic change occurs when the gas
A. expands
B. compressed
C. expands or compressed
D. expands or compressed rapidly
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 The internal energy of a system does not depend upon the
A. initial state of the system
B. final state of the system
C. path
D. none of them
7 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
8 When heat is removed from the system
A. negative
B. positive
C. zero
D. any one of them
9 First law of thermodynamic is special case of
A. Law of conservation of energy
B. Charle's law
C. Law of conservation of mass
D. Boyle's law
10 The percentage of available heat energy converted into work by a diesel engine is roughly
A. 35 %`
B. 40 %
C. 35 - 40 %
D. 25 %
11 A reversible cycle is the one in which
A. some of the changes are reversible
B. all of the changes are reversible
C. all of the changes are irreversible
D. none of them
12 Rice takes longest to cook
A. In a submarine 100 m below the surface of the sea
B. At sea level
C. At Murree
D. At Mount Everest
13 If the volume of the gas is to be increased by 4 times, then
A. Temperature and pressure must be doubled
B. At constant P the temperature must be increased by 4 times
C. At constant T the pressure must be increased by four times
D. It cannot be increased
14 The highest efficiency of a heat engine whose low temperature is 17°C and the high temperature is 200°C is
A. 70%
B. 100%
C. 35%
D. 38%
15 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

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