Select topics and difficulty and just practice mcqs.
Heat And Thermodynamics
Steel Structure Design
User (name or email)
pick difficulty level
number of questions
Let's practice 30 mcqs on
Heat And Thermodynamics
mcqs by everyone
Heat given to a body which raises its temperature by 1degree centigrade is
A system absorbs 1000 cal of heat and does 1675 J of externalwork.
If J = 4.18 J/cal, then the change in internal energy of the system is
+ 1000 J
+ 1675 J
+ 2505 J
+ 650 J
Air in a cylinder is suddenly compressed by a piston which is then maintained at the sameposition.
With the passage of time
the pressure remains the same
the pressure increases
the pressure may increase or decrease depending on the nature of the gas
the pressure decreases
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
If r, a and t represent the reflection coefficient, absorption coefficient and transmission coefficient respectively, then for a perfectly black body
r = 0, a = 0, t = 0
r = 0, a = 0 and t = 0
r = 1, a = 0 and t = 0
r = 0, a = 1, t = 0
For a perfect gas if
T is given P and V both are uniquely determined
P and V are given T is uniquely determined
T is given V is uniquely determined
T is given P is uniquely determined
A Carnot engine takes 300 cal of heat at 500 K and rejects 150 cal of heat to thesink.
The temperature of sink is
During the adiabatic expansion of 2 mol of a gas, the internal energy of the gas is found to decrease by 2 J. The work done during the process on the gas will be equal to
- 1 J
- 2 J
Which of the following carries anomalous expansion
A temperature may be measured by using a constant volume gas thermometer and measuring the pressure of the gas both at the triple point of water and at the unknowntemperature.
Which one of the following procedures is necessary if two gas thermometers, using different real gases, are to agree
Take readings at very low pressures in both thermometers.
Use gases of the same density in both thermometers
Use gases of the same specific heat capacity in both thermometers.
Use the same mass of gas in both thermometers.
From what height should a piece of ice fall so that it melts completely ? (Given : one-quarter of the heat produced is absorbed by ice and latent heat is L)
2L / g
L / g
4L / g
3L / g
Which of the following statements is correct for any thermodynamic system
The change in entropy can never be zero
Internal energy and entropy are state functions
The internal energy changes in all processes
The work done in an adiabatic process is always zero
If same amount of heat is supplied to two identical spheres (one is hollow and other is solid), then
the expansion in hollow is lesser than the solid
the temperature of both must be same to each other
the expansion in hollow is greater than the solid
the expansion in hollow is same as that in solid
A gas is filled in acylinder.
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
When a metal rod is heated it expands because
the distance among its atoms increases
the actual cause is still unknown
atmospheric air rushes into it
the size of its atoms increases
A vessel containing 5 litre of a gas at 0.8 m pressure is connected to an evacuated vessel of volume 3litre.
The resultant pressure inside will be
(assuming whole system to be isolated)
During adiabatic change, specific heat is
less than zero
greater than zero
One mole of an ideal gas requires 207 J heat to raise the temperature by 10 K when heated at constantpressure.
If the same gas is heated at constant volume to raise the temperature by the same 10 K, then the heat required is
At what temperature is the effective speed of gaseous hydrogen molecules equal to that of oxygen molecules at 47 degreeCentigrade
Molar heat capacity is directly related to
If the door of a refrigerator is kept open then which of following is true
Room is either cooled or heated
Room is heated
Room is neither cooled nor heated
Room is cooled
In a thermodynamic process, the pressure of a fixed mass of gas is changed in such a manner that the gas molecules give out 30 J of heat and 10 J of work is done on thegas.
If the initial internal energy of the gas was 40 J, then the final internal energy will be
- 20 J
In a thermodynamic system working substance is ideal gas its internal energy is in the form of
None of the above
kinetic energy only
kinetic and potential energy
The scale of temperature on which the temperature are only positive is
A monoatomic ideal gas expands at constant pressure, with heat Qsupplied.
The fraction of Q which goes as work done by the gas is
2 / 3
3 / 5
2 / 5
Significant motion for the molecules of a monoatomic gas corresponds to
NONE OF THESE
If a system undergoes contraction of volume, then the work done by the system is
A bimetal made of copper and iron strips welded together is straight at roomtemperature.
It is held vertically in the hand so that iron strip is towards the left hand and copper strip is towards the right handside.
This bimetal is then heated byflame.
The bimetal strip will
bend towards right
bend towards left
Measurements of the radiation from an astronomical source showed a decrease in the wavelength at which the greatest energy was beingreceived.
This could mean that the source had
expanded but maintained a constant temperature
decreased in temperature
increased in temperature
contracted but maintained a constant temperature
The process in which the heat is not transferred from one state to another, is
we serve best when javscript is enabled