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question_answer1)
Woolen clothes are used in winter season because woolen clothes
A)
are good sources for producing heat done
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B)
absorb heat form surroundings done
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C)
are bad conductors of heat done
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D)
provide heat to body continuously done
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question_answer2)
Water has maximum density at
A)
\[0{}^\circ C\] done
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B)
\[32{}^\circ F\] done
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C)
\[-\,4{}^\circ C\] done
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D)
\[4{}^\circ C\] done
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question_answer3)
Expansion during heating
A)
occurs only in solids done
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B)
increases the weight of a material done
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C)
decreases the density of a material done
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D)
occurs at the same rate for all liquids and solids done
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question_answer4)
When a copper ball is heated, the largest percentage increase will occur in its
A)
diameter done
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B)
area done
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C)
volume done
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D)
density done
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question_answer5)
If a liquid is heated in condition of weightlessness, the heat is transmitted through
A)
conduction done
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B)
convection done
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C)
radiation done
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D)
None, because the liquid cannot be heated in weightlessness done
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question_answer6)
Heat travels through vacuum by
A)
conduction done
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B)
convection done
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C)
radiation done
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D)
both [a] and [b] done
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question_answer7)
A bimetallic strip consists of brass and iron. When it is heated it bends into an arc with brass on the convex and iron on the concave side of the arc. This happens because
A)
brass has a higher specific heat capacity than iron done
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B)
density of brass is more than that of iron done
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C)
it is easier to bend an iron strip than a brass strip of the same size done
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D)
brass has a higher coefficient of linear expansion than iron done
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question_answer8)
The earth radiates in the infra-red region of the spectrum. The spectrum is correctly given by
A)
Wien's law done
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B)
Rayleigh's law done
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C)
Planck's law of radiation done
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D)
Stefan 's law of radiation done
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question_answer9)
Good absorbers of heat are
A)
poor emitters done
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B)
non-emitters done
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C)
good emitters done
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D)
highly polished done
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question_answer10)
Which of the following qualities suit for a cooking utensil?
A)
High specific heat and low thermal conductivity done
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B)
High specific heat and high thermal conductivity done
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C)
Low specific heat and low thermal conductivity done
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D)
Low specific heat and high thermal conductivity done
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question_answer11)
5g ice at \[0{}^\circ C\] is mixed with 5g of steam at \[100{}^\circ C\] What is the final temperature?
A)
\[50{}^\circ C\] done
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B)
\[100{}^\circ C\] done
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C)
\[80{}^\circ C\] done
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D)
\[150{}^\circ C\] done
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question_answer12)
By the first law of thermodynamics, for solids
A)
\[dQ=dU+dW\] done
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B)
\[dQ=dU\] done
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C)
\[\partial Q=\partial W+dU\] done
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D)
\[\partial Q=\partial W+dU\] done
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question_answer13)
There are four objects A, B, C and D. It is observed that A and B are in thermal equilibrium and C and D are also in thermal equilibrium. However, A and C are not in thermal equilibrium. We can conclude that -
A)
B and D are in thermal equilibrium done
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B)
B and D could be in thermal equilibrium but might not be A and D done
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C)
B and D cannot be in thermal equilibrium done
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D)
the zeroth law of thermodynamics does not apply here because there are more than three objects done
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question_answer14)
According to the kinetic theory of gases
A)
all the atoms move horizontally with equal speeds done
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B)
an atom moves faster during its downward motion than its upward motion done
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C)
at any instant one-third of the total atoms are moving along x-axis done
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D)
None of these done
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question_answer15)
The fastest mode of transfer of heat is
A)
conduction done
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B)
convection done
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C)
radiation done
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D)
None of these done
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question_answer16)
The wavelength of radiation emitted by a body depends upon
A)
the nature of its surface done
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B)
the area of its surface done
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C)
the temperature of its surface done
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D)
All of the above done
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question_answer17)
The sprinkling of water slightly reduces the temperature of a closed room because
A)
temperature of water is less than that of the room done
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B)
specific heat of water is high done
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C)
water has large latent heat of vaporization done
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D)
water is a bad conductor of heat done
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question_answer18)
Which of the following is not close to a black body?
A)
Black board paint done
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B)
Green leaves done
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C)
Black holes done
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D)
Red roses done
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question_answer19)
A solid cube and a solid sphere of the same material have equal surface area. Both are at the same temperature \[120{}^\circ C,\] then
A)
both the cube and the sphere cool down at the same rate done
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B)
the cube cools down faster than the sphere done
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C)
the sphere cools down faster than the cube done
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D)
whichever is having more mass will cool down faster done
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question_answer20)
At a given temperature the internal energy of a substance
A)
in liquid state is equal to that in gaseous state done
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B)
in liquid state is less than that in gaseous state done
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C)
in liquid state is more than that in gaseous state done
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D)
is equal for the three states of matter done
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question_answer21)
Consider two identical iron spheres, one which lie on a thermally insulating plate, while the other hangs from an insulatory thread. Equal amount of heat is supplied to the two spheres
A)
Temperature of A will be greater than B done
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B)
Temperature of B will be greater than A done
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C)
Their temperature will be equal done
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D)
Can't be predicted done
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question_answer22)
Air conditioner is based on the principle of
A)
Carnot cycle done
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B)
refrigerator done
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C)
first low of thermodynamics done
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D)
None of these done
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question_answer23)
Gases exert pressure on the walls of the container because the gas molecules
A)
possess momentum done
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B)
collide with each other done
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C)
have finite volume done
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D)
obey gas laws done
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question_answer24)
Food in the pressure cooker is cooked faster, as
A)
the boiling point increases due to an increase in pressure done
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B)
the boiling point decreases due to an increase in pressure done
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C)
more steam is available at \[100{}^\circ C\] done
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D)
more pressure is available at \[100{}^\circ C\] done
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question_answer25)
A metal sheet with a circular hole is heated. The hole
A)
gets larger done
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B)
gets smaller done
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C)
remains of the same size done
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D)
gets deformed done
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question_answer26)
When water is heated from \[0{}^\circ C\] to \[10{}^\circ C,\] its volume
A)
increases done
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B)
decreases done
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C)
does not change done
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D)
first decreases and then increases done
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question_answer27)
A: At high altitude regions the cooking of food becomes difficult. B: Water boils at lower temperature when the pressure is low.
A)
Both A and B are wrong. done
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B)
A and B are correct and B is not the correct explanation of A done
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C)
A and B are correct and B is the correct explanation of A. done
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D)
A is correct but B is wrong. done
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question_answer28)
When vapour condenses into liquid
A)
it absorbs heat done
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B)
it liberates heat done
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C)
its temperature rises done
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D)
its temperature decreases done
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question_answer29)
The temperature of the sun is measured with
A)
Platinum thermometer done
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B)
Gas the romometer done
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C)
Pyrometer done
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D)
Vapour pressure thermometer done
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question_answer30)
Two spheres of same size are made of the same metal but one is hollow and the other is solid. They are heated to same temperature, then
A)
both spheres will expand equally done
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B)
hollow sphere will expand more than the solid one done
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C)
solid sphere will expand more than the hollow one done
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D)
None of the above done
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question_answer31)
Heat is transmitted from higher to lower temperature through actual mass motion of the molecules in
A)
conduction done
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B)
convection done
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C)
radiation done
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D)
none of these done
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question_answer32)
The temperature of a room is \[77{}^\circ F\]. What would it be on the Celsius scale?
A)
\[25{}^\circ C\] done
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B)
\[45{}^\circ C\] done
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C)
\[60{}^\circ C\] done
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D)
\[350{}^\circ C\] done
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question_answer33)
Ventilators are provided at the top of room
A)
to bring oxygen for breathing done
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B)
so that sunlight may enter the room done
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C)
to maintain conventional currents to keep the air fresh in the room done
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D)
to provide an outlet for carbon dioxide done
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question_answer34)
What temperature is the same on celsius scale as well as on Fahrenheit scale?
A)
\[-\,212{}^\circ C\] done
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B)
\[-\,40{}^\circ C\] done
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C)
\[-\,32{}^\circ C\] done
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D)
\[32{}^\circ C\] done
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question_answer35)
Two holes of unequal diameters \[{{d}_{1}}\] and \[{{d}_{2}}\]\[({{d}_{1}}>{{d}_{2}})\]are cut in a metal sheet. If the sheet is heated,
A)
both \[{{d}_{1}}\] and \[{{d}_{2}}\] will decrease done
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B)
both \[{{d}_{1}}\] and \[{{d}_{2}}\] will increase done
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C)
\[{{d}_{1}}\] will increase, \[{{d}_{2}}\] will decrease done
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D)
\[{{d}_{1}}\]will decrease, \[{{d}_{2}}\] will increase done
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question_answer36)
At \[0{}^\circ C\]a body emits
A)
no radiation done
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B)
only visible light done
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C)
only microwave radiation done
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D)
all wavelengths. done
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question_answer37)
Triple point is the temperature at which
A)
matter may simultaneously exist in liquid and gaseous state. done
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B)
matter may simultaneously exist in liquid and solid state. done
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C)
matter may simultaneously exist in solid and gaseous state. done
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D)
matter may simultaneously exist in all the three forms. done
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question_answer38)
In order that the heat flows from one part of a solid to another part, what is required?
A)
Uniform density done
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B)
Temperature gradient done
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C)
Density gradient done
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D)
Uniform temperature done
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question_answer39)
At a common temperature, a block of wood and a block of metal feel equally cold or hot. The temperatures of block and wood are
A)
equal to the temperature of the body done
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B)
less than the temperature of the body done
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C)
greater than temperature of the body done
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D)
either [b] or [c] done
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question_answer40)
The bulb of one thermometer is spherical, while that of other is cylindrical. If both of them have equal amount of mercury, which thermometer will respond quickly to the temperature?
A)
spherical bulb done
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B)
cylindrical bulb done
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C)
elliptical bulb done
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D)
both [a] and [c] done
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question_answer41)
Consider the following statements.
[A] Some bodies may contract on heating |
[B] Water shows anamolous expansion. |
A)
[A] is true and [B] is false done
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B)
[A] is false and [B] is true. done
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C)
Both [A] and [B] are true. done
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D)
Both [A] and [B] are false. done
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question_answer42)
The rate of flow of heat through a rod depends on:
A)
thermal conductivity of the rod. done
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B)
length of the rod. done
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C)
temperature difference across the rod. done
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D)
All of these done
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question_answer43)
Which of the following represents convection?
A)
Land breeze done
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B)
Exhaust fan done
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C)
Heating water by keeping the vessel on a flame done
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D)
All of these done
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