JEE Questions for Physics Thermal Properties Of Matter Quiz 16 - MCQExams.com

Assertion: Greater the coefficient of thermal conductivity of a material, smaller is the thermal resistance of a rod of that material
Reason: Thermal resistance is the ratio of temperature difference between the ends of the conductor and rate of flow of heat.
  • If both Assertion and Reason are true and then Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but reason is not the correct explanation of the Assertion
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true
Assertion: Radiation is the speediest mode of hear transfer.
Reason: Radiation can be transmitted in zig-zag motion
  • If both Assertion and Reason are true and then Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but reason is not the correct explanation of the Assertion
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true
Water and turpentine oil (specific heat less than that of water) and both heated to same temperature. Equal amounts of these placed in identical calorimeters are then left in air
Physics-Thermal Properties of Matter-91590.png
  • Their cooling curves will be identical
  • A and B will represent cooling curves of water and oil respectively
  • B and A will represent cooling curves of water and oil respectively
  • None of the above
Two vessels of different materials are similar in size in every respect. The same quantity of ice filled in them gets melted in 20 minutes and 40 minutes respectively. The ratio of thermal conductivities of the materials is
  • 2 : 1
  • 5 : 6
  • 6 : 5
  • 3 : 1
In a steady state of thermal conduction, temperature of the ends A and B of a 20 cm long rod are 100oC and 0oC respectively. What will be the temperature of the rod at a point at a distance of 6 cm from the end A of the rod?
  • —30° C
  • 70oC
  • 5oC
  • None of these
Four rods of silver, copper, brass and wood are of same shape. They are heated together after wrapping a paper on it, the paper will burn first on
  • Silve
  • Copper
  • Brass
  • Wood
The two opposite faces of a cubical piece of iron (thermal conductivity = (12 C.G.S. units) are at 100°C and 0oC in ice. If the area of a surface is 4 cm2 then the mass of ice melted in 10 minutes will be
  • 30 g
  • 300 g
  • 5 g
  • 50 g
Wien’s constant is 2892 x 10-6 M.K.S. unit and the value of λm from moon is 14.46 microns. What is the surface temperature of moon?
  • 100 K
  • 300 K
  • 400 K
  • 200 K
Two friends A and B are waiting for another friend for tea. A took tea in a cup and mixed the cold milk and then waits. B took the tea in the cup and then mixed the cold milk when the friend comes. Then, the tea will be hotter in the cup of
Physics-Thermal Properties of Matter-91596.png
  • A
  • B
  • Tea will be equally hot in both cups
  • Friend's cup
There are two spherical balls A and B of the same material with same surface, but the diameter of A is half that of H. If A and B arc heated to the same temperature and then allowed to cool, then
  • Rate of cooling is same in both
  • Rate of cooling of A is four times that of B
  • Race of cooling of A is twice that o B
  • Rate of cooling of A is 1/4 times that of B
Five identical rods are joined as shown in figure. Point A and C are maintained at temperature 120°C and 2OoC respectively. The temperature of j unction B will be
Physics-Thermal Properties of Matter-91598.png
  • 100oC
  • 80oC
  • 70oC
  • 0oC
A body takes T minutes to cool from 62C to 61 C when the surrounding temperature is 3OoC. The time taken by the body to cool from 46t to 45.5°C is
  • Greater than T minutes
  • Equal to T minutes
  • Less than T minutes
  • Equal to 172 minutes
Can we boil water inside the earth satellite by convection
  • Yes
  • No
  • Nothing can be said
  • In complete information is given
Two conducting rods A and B of same length and cross- sectional area are connected (i) In series (ii) In parallel as shown. In both combination a temperature difference of 100oC is maintained. If thermal conductivity of A is 3K and that of B is K, then the ratio of heat current flowing in parallel combination to that flowing in series combination is
Physics-Thermal Properties of Matter-91601.png
  • 16/3
  • 3/16
  • 1/1
  • 1/3
In the following figure, two insulating sheets with thermal resistances R and 3R as shown in figure. The temperature θ is
Physics-Thermal Properties of Matter-91603.png
  • 20oC
  • 60oC
  • 75oC
  • 80oC
The area of the glass of a window of a room is 10 m2 and thickness 2 mm. The outer and inner temperature arc 40°C and 20°C respectively. Thermal conductivity of glass in M.K.S. system is 0.2. The heat flowing in the room per second will be

  • Physics-Thermal Properties of Matter-91605.png
  • 2)
    Physics-Thermal Properties of Matter-91606.png
  • 30 J
  • 45 J
The spectrum from a black body radiation is a
  • Line spectrum
  • Band spectrum
  • Continuous spectrum
  • Line and band spectrum both
The top of insulated cylindrical container is covered by a disc having emissivity 0.6 and thickness 1 cm. The temperature is maintained by circulating oil as shown in figure. If temperature of upper surface of disc is 127°C and temperature of surrounding is 27°C, then the radiation loss to the surrounding will be
Physics-Thermal Properties of Matter-91608.png

  • Physics-Thermal Properties of Matter-91609.png
  • 2)
    Physics-Thermal Properties of Matter-91610.png

  • Physics-Thermal Properties of Matter-91611.png

  • Physics-Thermal Properties of Matter-91612.png
The following figure shows two air-filled bulbs connected by a U-tube partly filled with alcohol. What happens to the levels of alcohol in the limbs X and Y when an electric bulb is placed midway between the bulbs is Lighted
Physics-Thermal Properties of Matter-91614.png
  • The level of alcohol in limb X falls while that in limb Y rises
  • The level of alcohol in limb X rises while that in limb Y falls
  • The level of alcohol falls in both limbs
  • There is no change in the levels of alcohol in the two limbs
Out of the following, in which vessel will the temperature of the solution be higher after the salt is completely dissolved?
Physics-Thermal Properties of Matter-91615.png
  • A
  • B
  • Equal in both
  • Information is not sufficient
A steel ball of mass 0.1 kg falls freely from a height of 10 m and bounces to a height of 5.4 m from the ground. If the dissipated energy in this process is absorbed by the hail, the rise in its temperature is (Specific heat of steel = 460 J kg-1C-2g = 10 ms-2)
  • 0.01°C
  • 0.1°C
  • 1°C
  • 1.1°C
Water falls from a height of 500 m. What is the rise in temperature of water at bottom if whole energy remains in the water?
  • 0.96°C
  • 1.02oC
  • 1.16°C
  • 0.23°C
A steel metre scale is to be ruled so that millimetre intervals are accurate within about 5 x i0 mm at a certain temperature. The maximum temperature variation allowable during the ruling is (Coefficient of linear expansion of steel = 10 × 10-6 K-1)
  • 2°C
  • 5o C
  • 7°C
  • 10°C
During illness, a 80 kg man ran a fever of 102.2F instead of normal body temperature of 98.6°F. Assuming that human body is mostly water, how much heat is required to raise his temperature by that amount
  • 100 kcal
  • 160 kcal
  • 50 kcal
  • 92 kcal

Physics-Thermal Properties of Matter-91620.png

  • Physics-Thermal Properties of Matter-91621.png
  • 2)
    Physics-Thermal Properties of Matter-91622.png

  • Physics-Thermal Properties of Matter-91623.png

  • Physics-Thermal Properties of Matter-91624.png
If earth suddenly stops rotating about its own axis, the increase in it’s temperature will be

  • Physics-Thermal Properties of Matter-91625.png
  • 2)
    Physics-Thermal Properties of Matter-91626.png

  • Physics-Thermal Properties of Matter-91627.png
  • None of these
Latent heat of ice is 80 cal/g. A man melts 60 g of ice by chewing in 1 minute. His power is
  • 480W
  • 336W
  • 1.33 W
  • 0.75W
A faulty thermometer has its lower fixed point marked as —10°C and upper fixed point marked as 110°. If the temperature of the body shown in this scale is 62°, the temperature shown on the Celsius scale is
  • 72oC
  • 82oC
  • 60oC
  • 42oC
If there are no heat losses, the heat released by the condensation of x g of steam at 100°C into water at 100oC can be used to converty g of ice at 0oC into water at 100oC. Then, the ratio y : x is nearly
  • 1:1
  • 2.5:1
  • 2:1
  • 3:1
The figure shows a glass tube (linear coefficient of expansion is α) completely filled with a liquid of volume expansion coefficient γ. On heating length of the liquid column does not change. Choose the correct relation between γ and α
Physics-Thermal Properties of Matter-91632.png

  • Physics-Thermal Properties of Matter-91633.png
  • 2)
    Physics-Thermal Properties of Matter-91634.png

  • Physics-Thermal Properties of Matter-91635.png

  • Physics-Thermal Properties of Matter-91636.png
Two thermometers are used to record the temperature of a room. If the bulb of one is wrapped in wet hanky
  • The temperature recorded by both will be same
  • The temperature recorded by wet-bulb thermometer will be greater than that recorded by the other.
  • The temperature recorded by dry-bulb thermometer will be greater than the that recorded by the other
  • None of the above
A pendulum clock keeps correct time at 0°C. Its mean coefficient of linear expansions is α /°C, then the loss in seconds per day by the clock if the temperature rises by t°C is

  • Physics-Thermal Properties of Matter-91638.png
  • 2)
    Physics-Thermal Properties of Matter-91639.png

  • Physics-Thermal Properties of Matter-91640.png

  • Physics-Thermal Properties of Matter-91641.png
The coefficient of apparent expansion of a liquid when determined using two different vessels A and B ate γ1 and γ2 respectively. If the coefficient of linear expansion of the vessel A is α, the coefficient of linear expansion of the vessel B is

  • Physics-Thermal Properties of Matter-91643.png
  • 2)
    Physics-Thermal Properties of Matter-91644.png

  • Physics-Thermal Properties of Matter-91645.png

  • Physics-Thermal Properties of Matter-91646.png
The coefficient of volume expansion of a liquid is 49 × 10–2 K–1. Calculate the fractional change in its density when the temperature is raised by 30°C.
  • 7.5 × 10–2
  • 3.0 × 10–2
  • 1.5 × 10–2
  • 1.1 × 10–2
A clock with a metal pendulum beating seconds keeps correct time at 0°C. If it loses 12.5 s a day at 25°C, the coefficient of linear expansion of metal pendulum is

  • Physics-Thermal Properties of Matter-91649.png
  • 2)
    Physics-Thermal Properties of Matter-91650.png

  • Physics-Thermal Properties of Matter-91651.png

  • Physics-Thermal Properties of Matter-91652.png
Three liquids with masses m1, m2, m3 are throughly mixed. If their specific heats are c1, c2, c3 and their temperatures T1, T2, T3 respectively, then the temperature of the

  • Physics-Thermal Properties of Matter-91654.png
  • 2)
    Physics-Thermal Properties of Matter-91655.png

  • Physics-Thermal Properties of Matter-91656.png

  • Physics-Thermal Properties of Matter-91657.png
Solids expand on heating because
  • Kinetic energy of the atoms increases
  • Potential energy of the atoms increases
  • Total energy of the atoms increases
  • The potential energy curve is asymmetric about the equilibrium distance between neighbouring atoms

Physics-Thermal Properties of Matter-91660.png

  • Physics-Thermal Properties of Matter-91661.png
  • 2)
    Physics-Thermal Properties of Matter-91662.png

  • Physics-Thermal Properties of Matter-91663.png

  • Physics-Thermal Properties of Matter-91664.png

  • Physics-Thermal Properties of Matter-91665.png
We have seen that a gamma-ray dose of 3 Gy is lethal to half the people exposed to it. If the equivalent energy were absorbed as heat, what rise in body temperature would result
  • 300 μK
  • 700 μK
  • 455 μK
  • 390 μK
In a vertical U-tube containing a liquid, the two arms are maintained at different temperatures t1 and t2. The liquid columns in the two arms have heights l1 and l2 respectively. The coefficient of volume expansion of the liquid is equal to
Physics-Thermal Properties of Matter-91668.png

  • Physics-Thermal Properties of Matter-91669.png
  • 2)
    Physics-Thermal Properties of Matter-91670.png

  • Physics-Thermal Properties of Matter-91671.png

  • Physics-Thermal Properties of Matter-91672.png
The graph shows the variation of temperature (T) of one kilogram of a material with the heat (H) supplied to it. At O, the substance is in the solid state. From the graph, we can conclude that
Physics-Thermal Properties of Matter-91674.png
  • T2 is the melting point of the solid
  • BC represents the change of state from solid to liquid
  • (H2 – Hrepresents the latent heat of fusion of the substance
  • (H3 – H1 ) represents the latent heat of vaporisation of the liquid
The figure given below shows the cooling curve of pure wax material after heating. It cools from A to B and solidifies along BD. If L and C are respective values of latent heat and the specific heat of the liquid wax, the ratio L/C is
Physics-Thermal Properties of Matter-91676.png
  • 40
  • 80
  • 100
  • 20
Which one of the figures gives the temperature dependence of density of water correctly ?

  • Physics-Thermal Properties of Matter-91682.png
  • 2)
    Physics-Thermal Properties of Matter-91683.png

  • Physics-Thermal Properties of Matter-91684.png

  • Physics-Thermal Properties of Matter-91685.png
A solid material is supplied with heat at constant rate and the temperature of the material changes as shown. From the graph, the false conclusion drawn is
Physics-Thermal Properties of Matter-91686.png
  • AB and CD of the graph represent phase changes
  • AB represents the change of state from solid to liquid
  • Latent heat of fusion is twice the latent heat of vaporisation
  • CD represents change of state from liquid to vapour
  • Latent heat of vaporisation is twice the latent heat of fusion
0:0:1


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