IIT JEE Thermodynamics Questions

Can you provide me some Heat and Thermodynamics questions for preparation of Indian Institutes of Technology Joint Entrance Examination (IIT-JEE)?

[sumit]

Some Heat and Thermodynamics questions for preparation of Indian Institutes of Technology Joint Entrance Examination (IIT-JEE) are as follows:

1.When a metal rod is heated it expands because:

the size of its atoms increases
the distance among its atoms increases
atmospheric air rushes into it
the actual cause is still unknown



2.Two vessels having equal volume contain molecular hydrogen at one atmosphere and helium at two atmospheres respectively. If both samples are at the same temperature the mean velocity of hydrogen molecules is:

equal to that of helium
twice that of helium
half that of helium
v2 times that of helium

3.At a certain temperature, hydrogen molecules have rms velocity 2 km/s. The rms velocity of the oxygen molecules at the same temperature is:

2 km/s
8 km/s
0.5 km/s
1 km/s

4.If the heat of 110 J is added to a gaseous system and change in internal energy is 40 J, then the amount of external work done is:

140 J
70 J
110 J
150 J

5.The internal energy U is a unique function of any state because change in U:

does not depend upon path
depend upon path
corresponds to an adiabatic process
corresponds to an isothermal process

6.In a thermodynamic system working substance is ideal gas its internal energy is in the form of:

kinetic energy only
kinetic and potential energy
potential energy
none of the above

7.Gas exerts pressure on the walls on the container because:

gas has weight
gas molecules have momentum
gas molecules collide with each other
gas molecules collide with the walls of the container

8.For a perfect gas if:

P and V are given T is uniquely determined
T is given P is uniquely determined
T is given V is uniquely determined
T is given P and V both are uniquely determined

9.The respective speeds of five molecules are 2, 1.5, 1.6, 1.6 and 1.2 km/s, the most probable speed in km/s will be:

2
1.58
1.6
1.31

10.Air in a cylinder is suddenly compressed by a piston which is then maintained at the same position. With the passage of time:

the pressure increases
the pressure decreases
the pressure remains the same
the pressure may increase or decrease depending on the nature of the gas

11.Which of the following statements is correct for any thermodynamic system?

The internal energy changes in all processes
Internal energy and entropy are state functions
The change in entropy can never be zero
The work done in an adiabatic process is always zero

12.If a system undergoes contraction of volume, then the work done by the system is:

positive
negative
negligible
zero

13.Heat given to a body which raises its temperature by 1degree centigrade is:

water equivalent
thermal capacity
specific heat
temperature gradient

14.Significant motion for the molecules of a monoatomic gas corresponds to:

translatory
vibratory
rotatory
none of these

15.If the door of a refrigerator is kept open then which of following is true?

Room is cooled
Room is heated
Room is either cooled or heated
Room is neither cooled nor heated

16.The most efficient heat engine is one which is:

reversible
irreversible
driven by high speed diesel
none of the above

17.A gas is filled in a cylinder. Its temperature is increased by 20% on kelvin scale and volume is reduced by 10%. How much percentage of the gas has to leak for pressure to remain constant?

30%
40%
15%
25%

18.When rod is heated but prevented from expanding, the stress is independent of:

material of the rod
rise in temperature
length of rod
none of these

19.For an isolated system:

volume is constant
pressure is constant
temperature is constant
all of these

20.Internal energy of ideal gas depend on:

only pressure
only volume
only temperature
none of these


21.The molecular weight of gas is 44. The volume occupied by 2.2 g of this gas at 0 degreeCentigrade and 2 atm pressure, will be:

0.56 L
1.2 L
2.4 L
5.6 L

22.If mass-energy equivalence is taken into account, when water is cooled to form ice, the mass of water should:

increase
remain unchanged
decrease
first increase then decrease

23.Which statement is incorrect?

All reversible cycles have same efficiency
Reversible cycle has more efficiency than an irreversible one
Carnot cycle is a reversible one
Carnot cycle has the maximum efficiency in all cycles

24.A block of mass 100 g slides on a rough horizontal surface. If the speed of the block decreases from 10 m/s to 5 m/s the thermal energy developed in the process is:

3.75 J
37.5 J
0.375 J
0.75 J

25.The process in which the heat is not transferred from one state to another, is:

isothermal process
adiabatic process
isobaric process
isochoric process

26.Heat cannot be itself flow form a body at lower temperature to a body at higher temperature is a statement of consequence of:

second law of thermodynamics
conservation of momentum
conservation of mass
first law of thermodynamics

27.The specific heat of gas in an isothermal process is:

zero
infinite
negative
remains constant

28.The standard fixed point for temperature measurement is used these day is:

melting point of ice at STP
that temperature at which ice water and water vapour coexist
that temperature at which pure ice and pure water coexist
none of the above

29.Which of the following parameters does not characterize the thermodynamic state of matter?

Volume
Temperature
Pressure
Work