JEE Questions for Physics Thermal Properties Of Matter Quiz 10 - MCQExams.com

540 g of ice at 0oC is mixed 540 g of water at 80oC. The final temperature of the mixture is
  • 0oC
  • 40oC
  • 80oC
  • Less than 0oC
How much heat energy is gained when 5 kg of water at 20oC is brought to its boiling point?
(Specific heat of water = 4.2 × kJ kg–1C–1)
  • 1680 kJ
  • 1700 kJ
  • 1720 kJ
  • 1740 kJ
19 g of water at 30oC and 5 g of ice at –20oC are mixed together in a calorimeter. What is the final temperature of the mixture? Given specific heat of ice = 0.5 cal g–1 (oC)–1 and latent heat of fusion of ice = 80 cal g–1
  • 0oC
  • –5oC
  • 5oC
  • 10oC
80 g of water at 30oC are poured on a large block of ice at 0oC. The mass of ice that melts is
  • 30g
  • 80g
  • 1600g
  • 150g
The saturation vapour pressure of water at 100oC is
  • 739 mm of mercury
  • 750 mm of mercury
  • 760 mm of mercury
  • 712 m of mercury
Two spheres made of same substance have diameters in the ration 1:2. Their thermal capacities are in the ratio of
  • 1 : 2
  • 1 : 8
  • 1 : 4
  • 2 : 1
Compared to a burn due to water at 100oC, a burn due to steam at 100oC is
  • More dangerous
  • Less dangerous
  • Equally dangerous
  • None of these
Two liquids A and B are at 32oC and 24oC. When mixed in equal masses, the temperature of the mixture is found to be 28oC. Their specific heats are in the ratio of
  • 3 : 2
  • 2 : 3
  • 1 : 1
  • 4 : 3
It is difficult to cook rice in an open vessel by boiling it a high altitude because of
  • Low boiling point and high pressure
  • High boiling point and low pressure
  • Low boiling point and low pressure
  • High boiling point and high pressure
Amount of heat required to raise the temperature of a body through 1 K is called its
  • Water equivalnet
  • Thermal capacity
  • Entropy
  • Specific heat
A liquid of mass m and specific heat C is heated to a temperature 2T. Another liquid of mass m/2 and specific heat 2C is heated to a temperature T. If these two liquids are mixed, the resulting temperature of the mixture is
  • (2/3)T
  • (8/5)T
  • (3/5)T
  • (3/2)T
Calorie is defined as the amount of heat required to raise temperature of 1 g of water by 1oC and its is defined under which of the following conditions?
  • From 14.5oC to 15.5oC at 760 mm of Hg
  • From 98.5oC to 99.5oC at 760 mm of Hg
  • From 13.5oC to 14.5oC at 76 mm og Hg
  • From 3.5oC to 4.5oC at 76 mm of Hg
0.1 m3 of water at 80oC is mixed with 0.3 m3 of water at 60oC. The final temperature of the mixture is
  • 65oC
  • 70oC
  • 60oC
  • 75oC
A bubble of 8 moles of helium is submerged at a certain depth in water. The temperature of water increases by 30oC. How much heat is added approximately to helium during expansion?
  • 4000J
  • 3000J
  • 3500J
  • 5000J
An experiment takes 10 minutes to raise temperature of water from 0oC to 100oC and another 55 minutes to convert it totally into steam by a stabilized heater. The latent heat of vaporization comes out to be
  • 530 cal/g
  • 540 cal/g
  • 550 cal/g
  • 560 cal/g
The pressure cooler, the cooking is fast, because
  • The boiling point of water is raised by the increased pressure inside the cooker
  • The boiling point of water is lowered by pressure
  • More steam is available to cook the food at 100oC
  • More pressure is available to cook the food at 100oC
A liquid of mass M and specific heat S is at a temperature 2t. If another liquid of thermal capacity 1.5 times, at a temperature of t/3 is added to it, the resultant temperature will be

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  • 2)
    Physics-Thermal Properties of Matter-91192.png

  • Physics-Thermal Properties of Matter-91193.png

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0.93 watt-hour of energy is supplied to a block of ice weighing 10 g. It is found that
  • Half of the block melts
  • The entire block melts and the water attains a temperature of 4oC
  • The entire block just melts
  • The block remains unchanged
The weight of a person if 60 kg. If he gets 105 calories heat through food and the efficiency of his body is 28%, then upto how much height he can climb (approximately)
  • 100 m
  • 200 m
  • 400 m
  • 1000 m
The thermal capacity of a body is 80 cal, then its water equivalent is
  • 80 cal/g
  • 8 g
  • 80 g
  • 80 kg
A vessel contains 110 g of water. The heat capacity of the vessel is equal to 1 g water. The initial temperature of water in vessel is 10oC. If 220 g of hot water at 70oC is poured in the vessel, the final temperature neglecting loss, will be
  • 70oC
  • 80oC
  • 60oC
  • 50oC
A hailstone at 0oC falls from a height of 1 km on an insulting surface converting whole of its kinetic energy into heat. What part of it will melt? (g = 10 m/s2)

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  • 2)
    Physics-Thermal Properties of Matter-91201.png

  • Physics-Thermal Properties of Matter-91202.png
  • All part
If two masses of 5 kg each falling from height of 10 m, by which 2 kg water is stirred. The rise in temperature of water will be
  • 2.6oC
  • 1.2oC
  • 0.32oC
  • 0.12oC
A lead ball moving with a velocity v strikes a wall and stops. If 5% of its energy is converted into heat, then what will be the increase in temperature(specific heat of lead is S)?

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  • 2)
    Physics-Thermal Properties of Matter-91207.png

  • Physics-Thermal Properties of Matter-91208.png

  • Physics-Thermal Properties of Matter-91209.png
A mechanical equivalent of heat J is
  • A constant
  • A physical quantity
  • A conversion factor
  • None of these
Boiling water is changing into steam. At this stage the specific heat of water is
  • < 1
  • ∞
  • 1
  • 0
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
The point on the pressure temperature phase diagram where all the phases co-exist is called
  • Sublimation
  • Fusion point
  • Triple point
  • Vaporization point
When the pressure on water is increased the boiling temperature of water as compared to 100oC will be
  • LOwer
  • The same
  • Higher
  • On the critical temperature
The sprinkling of water reduces slightly the temperature of a closed room because
  • Temperature of water is less than that of the room temperature
  • Specific heat of water is high
  • Water has large latent heat of vaporization
  • Water is a bad conductor of heat
The amount of water, which can be obtained by supplying 200 cal of heat, is
  • 840 dyne
  • 840 W
  • 840 erg
  • 840 J
How many grams of a liquid of specific heat 0.2 at a temperature 40oC must be mixed with 100 g of a liquid of specific heat of 0.5 at a temperature 20oC, so that the final temperature of the mixture becomes 32oC ?
  • 175 g
  • 300 g
  • 295 g
  • 375 g
1 g of a steam at 100oC melts how much ice at 0oC? (Latent heat of ice = 80 cal/g and latent heat of steam = 540 cal/g)
  • 1 g
  • 2 g
  • 4 g
  • 8 g

Physics-Thermal Properties of Matter-91216.png

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  • 2)
    Physics-Thermal Properties of Matter-91218.png

  • Physics-Thermal Properties of Matter-91219.png

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During constant temperature, we feel colder on a day when the relative humidity will be
  • 25%
  • 12.5%
  • 50%
  • 75%
Which of he following is the unit of specific heat?
  • J kgo C–1
  • J/kgoC
  • kgo C–1/J
  • J /kgo C–2
2 g f steam condenses when passed through 40 g of water initially at 25oC. The condensation of steam raises the temperature of water to 54.3oC. What is the latent heat of steam?
  • 540 cal/g
  • 536 cal//g
  • 270 cal/g
  • 480 cal/g
The freezing point of the liquid decreases when pressure is increased, if the liquid
  • Expands while freezing
  • Contacts while freezing
  • Does not change in volume while freezing
  • None of the above
The relative humidity on a day, when partial pressure of water vapour is 0.012 × 105 Pa at 12oC (take vapour pressure of water at this temperature as 0.016 × 105 Pa) is
  • 70%
  • 40%
  • 75%
  • 25%
A hammer of mass 1 kg having speed of 50 m/s, hit a iron nail of mass 200 g. If specific heat of iron is 0.105 cal/goC and half the energy is converted into heat, the raise in temperature of nail is
  • 7.1oC
  • 9.2oC
  • 10.5oC
  • 12.1oC
Latent heat of 1 g of steam is 536 cal/g, then its value in joule/kg is
  • 2.25 × 106
  • 2.25 × 106
  • 2.25
  • None of these
Which of the following has maximum specific heat?
  • Water
  • Alcohol
  • Glycerine
  • Oil
A stationary object at 4oC and weighing 3.5 kg falls from a height of 2000 m on a snow mountain at 0oC. If the temperature of the object just before hitting the snow is 0oC and the object comes to rest immediately (g = 10 m/s2) and (latent heat of ice 3.5 × 105 J/s), then the mass of ice that will melts is
  • 2 kg
  • 200 g
  • 20 g
  • 2 g
300 g of water at 25oC is added to 100 g of ice at 0oC. The final temperature of the mixture is

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  • 2)
    Physics-Thermal Properties of Matter-91229.png

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  • Physics-Thermal Properties of Matter-91231.png
A lead bullet strikes against a steel plate with a velocity 200 ms–1. If the impact is perfectly inelastic and the heat produced is equally shared between the bullet and the target, then he rise in temperature of the bullet is (specific heat capacity of lead = 125 J kg–1 K–1)
  • 80oC
  • 60oC
  • 160oC
  • 40oC
A glass flask is filled up to a mark with 50 cc of mercury at 18oC. If the flask and contents are heated to 38oC, how much mercury will be above the mark? (α for glass is 9 × 10–6/oC)
  • 0.85 cc
  • 0.46 cc
  • 0.153 cc
  • 0.05 cc

Physics-Thermal Properties of Matter-91235.png
  • 9 × 10–6/oC
  • 6 × 10–6/oC
  • 36 × 10–6/oC
  • 27 × 10–6/oC
Solid 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
An iron tyre is to be fitted on to a wooden wheel 1 m in diameter. The diameter of tyre is 6mm smaller than that of wheel. The tyre should be heated so that its temperature increases by a minimum of (the coefficient of cubical expansion of iron is 3.6 9 × 10–5/oC)
  • 167oC
  • 334oC
  • 500oC
  • 1000oC
Two rods of same length and material transfer a given amount of heat in 12 sec, when they are joined end to end. But when they are joined lengthwise, then they will transfer same heat in same conditions in
  • 24 s
  • 3 s
  • 1.5 s
  • 48 s
0:0:1


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