Paper for Entry Test Preparation
Physics 1st year Chapter No. 11
Total marks:- 180 Time
allowed 30 minutes
1)
Absolute zero is considered as that temperature at which:
a)
All liquid becomes gases b) All gases
becomes liquids c) Water freezes d) Non of all
2)
When two objects come to common temperature, the body is said to be in:
a)
Static equilibrium b) Dynamic equilibrium c) Thermal equilibrium d) Non of all
3)
Real gases strictly obey gas laws at:
a)
High pressure and low temperature b)
Low pressure and high temperature
c)
High pressure and high temperature d)
Low pressure and low temperature
4)
The only significant motion possessed by the mono atomic gas molecules is:
a)
Translatory b) Rotatory c) Vibratory d)
None of all
5)
The temperature scale approved in SI units is:
a)
Celsius scale b) Kelvin scale c) Fahrenheit scale d) All
of above
6)
Which of the following does not have the same units:
a)
Work b)
Heat c)
Kinetic energy d) Power
7)
At constant temperature, if the density of the gas is increases, its pressure
will:
a)
Decreases b) Increases c) Remains
same d) None of all
8)
The nature of thermal radiation is similar to:
a)
Ultraviolet rays b) Light
rays c) Both of them d) None of all
9)
Pressure applied at any point of the 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
thermodynamic law
10)
In the formula P = No KT, ‘No’ denotes:
a)
Number of molecules per unit volume b) Number of moles
c)
Number of molecules d) Non of all
11)
Gas constant per molecule is called:
a)
Universal gas constant b) Stefen’s constant
c) Boltzmann constant d) Gravitational
constant
12)
The rate of change of momentum of a molecule is equal to:
a)
Pressure b) Work c) Density d) Force
13)
Pressure may be defined as __ per second per unit area:
a)
Change in force b) Change in
momentum c) Change in energy d)
Work done
14)
Average K.E of a gas molecule has:
a)
Direct relation with absolute temperature and inverse relation with pressure
b)
Direct relation with both absolute temperature and pressure
c)
Inverse relation with both absolute temperature and pressure
d)
Non of all
15)
While dealing with the processes n thermodynamics, the working substance is
usually:
a)
Oxygen gas b) Hydrogen gas c) Ideal gas d) Non of all
16)
The pressure exerted on the walls of the vessel by the gas molecule is defined
as:
a) Force per unit volume b)
Energy per unit area c) Mass per
unit volume d) Non of all
17)
Brownian motion confirms the truth of:
a)
Wave theory of light b) Boyle’s law
c) Kinetic
theory of gases d) Adiabatic
process
18)
For a gas obeying Boyle’s law, if the pressure if doubles the volume becomes:
a)
One half b) Doubles c) Four times d) Non of these
19)
Thermal radiations are a type of:
a)
Mechanical waves b) Electromagnetic waves c)
Alpha rays d) Electrons
20)
When a gas is compressed:
a)
Its internal energy decreases b)
Its temperature decreases
c)
Its temperature increases d)
None of all
21)
First law of thermodynamics is merely a statement of low of conservation of:
a)
Energy b) Angular
momentum c) Charge d) Linear
momentum
22)
First law of thermodynamics when applied to an adiabatic process becomes:
a)
W = Du b) W = Q c) Q = DU d) W = -DU
23)
In which process, the change in internal energy of the system is zero:
a)
Isochoric process b) Isobaric process c) Adiabatic process d)
Isothermal process
24)
The increase in temperature of an object is an indication of:
a)
Decrease in KE only b) Increase in PE
only c) Increase in
internal energy d)
Non of all
25)
If P is the pressure and V is the volume, then PV will represent:
a)
Power b) Work c) Force d) Non of all
26)
Which of the following is not a state variable:
a)
Heat energy b) Pressure c) Entropy d) Volume
27)
When a substance is heated. Heat is converted into:
A)
Chemical energy b) Internal energy
c) Potential energy d)
Non of all
28)
The equation DU = Q – W is the
statement of __ law of thermodynamics:
a)
First b) Second c) Third d)
None
29)
The examples of an adiabatic process is/are:
a)
The rapid escape of air from a burst cycle b)
Cloud formation in the atmosphere
c)
Both (a) and (b) d)
Non of all
30)
If Cv denotes molar specific heat at constant volume and DT is the change in temperature, then CvDT gives:
a)
Volume b) Pressure c) Energy d)
Entropy
31)
A process in which no heat enters of leaves the system is called:
a)
Adiabatic process b) Isothermal process c)
Isochoric process d) Non
of all
32)
Thermodynamics is the study of relationship between:
a)
Heat and surrounding b)
Heat and other forms of energy
c)
Heat and liquid d)
Non of all
33)
A process which is carried at constant temperature and Boyle’s law can be
applied is called:
a)
Adiabatic process b) Isothermal process c) Isochoric process d)
Non of all
34)
Work done against friction is an example of:
a)
A reversible process b) An irreversible
process c) Adiabatic
process d)
Non of all
35)
Which of the following is an example of irreversible process:
a)
Evaporation and liquefaction b)
Work done by frication and explosion
c)
Work done by friction and liquefaction d)
Explosion and evaporation
36)
Steam engine is:
a)
An optical system b) A thermal system c) A
thermodynamics system d) None of these
37)
As the working substance of a heat engine completes a cycle, there is no change
in:
a)
Internal energy b) Pressure c) Volume d) None of these
38)
In a Carnot engine, at the end of the cyclic process, the temperature of the
working substance is:
a)
Zero b)
Equal to the initial temperature
c)
Greater than initial temperature d)
Smaller than initial temperature
39)
The ration for output work per cycle to input energy per cycle is called:
a)
Entropy b) Internal
energy c) Efficiency d) None of all
40)
If temperature of the sink is decreased, efficiency of a Carnot engine:
a)
Remains constant b) Decreases c)
Increases d) None of all
41)
The efficiency of a practical heat engine:
a)
Can be 100% b) Cannot be 100% c) Is always zero d) None of these
42)
Efficiency of a heat engine increases if:
a)
Temperature of sink is decreased b)
Temperature of source is decreases
c)
Temperature of sink is increases d) Both (b) and (c)
43)
One degree of thermodynamics scale of temperature is called:
a)
Celsius b) Fahrenheit c) Kelvin d) Radian
44)
Number of spark plugs needed in diesel engine is:
a)
Four b) Five c)
Six d) None of
all
45)
All natural processes proceed towards a state of:
a)
No change in entropy b) Decreases in entropy c) Increases of entropy d) None of all
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