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

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 # 2

The motion of molecules in gases is:

Question # 3

According to the second law, which is must to produce work

Question # 4

The efficiency of carnot engine cannot be 100% or one unless cold reservoir is at

Question # 5

A heat engine is that which converts

Question # 6

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

Question # 7

If 42 J heat is transferred to the system and the work done by the system is 32 J then what will be the change in internal energy

Question # 8

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

Question # 9

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

Question # 10

The absolute temperature of the tripple point of water is

Question # 11

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

Question # 12

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

Question # 13

Which of the following is not an assumption of kinetic energy

Question # 14

Brownian motion increases due to

Question # 15

Which of the following does not have the same units:

Question # 16

A real gas can be approximated to an ideal gas at

Question # 17

The internal energy of a system does not depend upon the

Question # 18

In an adiabatic process the work is done at the expense of the

Question # 19

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

Question # 20

Pressure exerted by a gas is

Question # 21

If the formula PV = nRT, n denotes:

Question # 22

Triple point of water is

Question # 23

On the exaust stroke, the outlet values opens. The residual gases are expelled and piston moves

Question # 24

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

Question # 25

Which of the following is a state variable

Question # 26

Efficiency of carnot engine is independent of the

Question # 27

The volume of a gas will be double of what it is at 0°C (pressure remaining constant) at

Question # 28

The ideal gas law is

Question # 29

On the power stroke, a spark fires the mixtures causing a rapid increase in pressure and temperature and the burning mixture expands

Question # 30

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

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 Tick the correct pair when M denotes the molecular mass and other symbols carry usual meanings:
A. N = nNAm = MNA
B. n = N NA, M = mNA
C. M = NA/N , NA= m/n
D. N = nNA, M = mNA
2 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
3 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
A. A greater than than of B
B. A is equal to that of B
C. A is less than that of B
D. A is twice the pressure of B
4 Boyle's law is applicable in
A. Isochoric process
B. Isothermal process
C. Isobaric process
D. Isotonic process
5 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
6 We can express the work in term of
A. directly measurable variables
B. indirectly measurable variables
C. either of them
D. both of them
7 The ideal gas law is
A. P = nRT
B. V = nRT
C. PV =RT
D. PV =nRT
8 Which quantity is important in stating the entropy of the system
A. initial entropy
B. final entropy
C. change in entropy
D. none of them
9 Carnot heat engine only used
A. isothermal processes
B. adiabatic processes
C. both of them
D. none of them
10 Which of the following is not thermo dynamical function?
A. Enthalpy
B. Work done
C. Gibb's energy
D. Internal energy

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