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

Pressure of a gas at constant volume is proportion to

Question # 2

Two metal rods A and B have their initial lengths in the ratio 2 : 3 and coefficients of linear expansion in the ratio 4 : 3. When they are heated through same temperature difference the ratio of their linear expansion is

Question # 3

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

Question # 4

A real gas can be approximated to an ideal gas at

Question # 5

The heat required to raise the temperature of one mole of the substance through 1 K is called

Question # 6

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

Question # 7

A gas which strictly obeys the gas laws under all conditions of temperature and pressure is called:

Question # 8

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

Question # 9

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

Question # 10

Which of the following is a state variable

Question # 11

When two objects are rubbed together, their internal energy

Question # 12

Rice takes longest to cook

Question # 13

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

Question # 14

Rate of diffusion is

Question # 15

An irreversible heat flow from a hot to cold substances of a system, causes the disorder to

Question # 16

Energy gas behaves like an ideal gast at

Question # 17

First law of thermodynamics tells us that heat energy can be converted into equivalent amount of work, but it is silent about

Question # 18

Triple point of water is

Question # 19

We cannot utilize the heat contents of oceans and atmosphere because

Question # 20

The product of the pressure and volume of an ideal gas is

Question # 21

In thermodynamics, internal energy is the function of

Question # 22

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

Question # 23

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

Question # 24

The nature of thermal radiation is similar to:

Question # 25

Which quantity is important in stating the entropy of the system

Question # 26

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

Question # 27

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

Question # 28

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

Question # 29

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

Question # 30

The second law of thermodynamics is concerned with the circumstances in which

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 The disorder in the system increases due to the
A. removal of heat
B. addition of heat
C. removal or addition of heat
D. none of them
2 In an ideal gas, the molecules have:
A. Kinetic energy only
B. Potential energy only
C. Both KE and PE
D. None of these
3 We cannot utilize the heat contents of oceans and atmosphere because
A. there is no reservoir at the same temperature
B. there is no reservoir at the temperature lower than any one of two
C. there is no reservoir at the temperature higher than any one of two
D. none of them
4 The process which is carried out at constant temperature is known as
A. adiabatic process
B. isothermal process
C. isochoric process
D. none of them
5 The efficiency of carnot engine cannot be 100% or one unless cold reservoir is at
A. 100 K
B. 273 K
C. 0 K
D. -273 K
6 If water in a closed bottle is taken up to the moon and opened, the water gets
A. Freeze
B. Boiled
C. Dissociated into O2and H2
D. Evaporated
7 If the distance between two charges is doubled, the force between them will become:
A. Double
B. Half
C. Three times
D. One fourth
8 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
9 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
10 On the power stroke, a spark fires the mixtures causing a rapid increase in pressure and temperature and the burning mixture expands
A. adiabatically
B. isothermally
C. isochorically
D. isobarically

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