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

Which quantity is important in stating the entropy of the system

Question # 2

The work done on the system by the environment is considered as

Question # 3

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:

Question # 4

Rate of diffusion is

Question # 5

We cannot utilize the heat contents of oceans and atmosphere because

Question # 6

The unit of thermodynamical scale is

Question # 7

One kilogram of different substances contain

Question # 8

A heat engine is that which converts

Question # 9

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

Question # 10

Internal energy is the sum of all the forms of

Question # 11

Carnot heat engine only used

Question # 12

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

Question # 13

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 # 14

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

Question # 15

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 # 16

If the volume of the gas is to be increased by 4 times, then

Question # 17

Pressure exerted by a gas is

Question # 18

What temperature is the same on Celsius scale as well as on Fahrenheit scale?

Question # 19

Sadi carnot described an ideal heat engine in

Question # 20

The highest efficiency of a heat engine whose low temperature is 17°C and the high temperature is 200°C is

Question # 21

Generally a temperature scale is established by

Question # 22

During the whole carnot cycle

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

When heat is removed from the system

Question # 25

The coefficient of linear expansion of iron is 0.000011 per°K. An iron rod is 10 metre long at 27°C. The length of the rod will be decreased by 1.1 mm when the temperature of the rod changes to

Question # 26

The pressure exerted by the gas is

Question # 27

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

Question # 28

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 # 29

In an ideal gas, the molecules have:

Question # 30

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

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 The pressure exerted by the gas is
A. directly proportional to the P.E
B. inversely proportional to the P.E
C. inversely proportional to the K.E
D. directly proportional to the K.E
2 A heat engine is that which converts
A. mechanical energy into thermal energy
B. thermal energy into mechanical energy
C. K.E into potential energy
D. heat energy into light energy
3 Sadi carnot described an ideal heat engine in
A. 1820
B. 1840
C. 1860
D. 1880
4 In a heat engine, heat is supplied by the
A. cold reservoir
B. sink
C. hot reservoir
D. none of them
5 While deriving the equation for pressure of a gas we consider the
A. rotational motion of molecules
B. vibrational motion of molecules
C. linear motion of molecules
D. all of them
6 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
7 A process which can be retraced in exactly reverse order, without producing any change in the surroundings is called
A. reversible process
B. irreversible process
C. any one of them
D. none of them
8 Pressure exerted by a gas is
A. Independent of density of the gas
B. Inversely proportional to the density of the gas
C. Directly proportional to the square of the density of the gas
D. Directly proportional to the density of the gas
9 10 c.c. each of oxygen and hydrogen are kept in separate flasks. Then which of the following relations is correct?
A. Each have same number of molecules
B. Don't have same number of molecules
C. Can't be predicted
D. None
10 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

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