JEE Questions for Physics Thermal Properties Of Matter Quiz 7 - MCQExams.com

If a cylinder of diameter 1.0 cm at 30°C is to be fitted into a hole of diameter 0.9997 cm in a steel plate at the same temperature, then minimum required rise in the temperature of the plate is (Coefficient of linear expansion of steel = 12 × 10–6/° C)
  • 25°C
  • 35°C
  • 45°C
  • 55°C
An iron bar of length 1 and having a cross-section A is heated from 0 to 100°C . If this bar is so held that it is not permitted to expand or bend, the force that is developed, is
  • Inversely proportional to the cross-sectional area of the bar
  • Independent of the length of the bar
  • Inversely proportional to the length of the bar
  • Directly proportional to the length of the bar
If specific heat of a substance is infinite, it means
  • Heat is given out
  • Heat is taken in
  • No change in temperature takes place whether heat is taken in or given out
  • All of the above
A gas in an airtight container is heated from 25°C to 90°C. The density of the gas will
  • Increase slightly
  • Increase considerably
  • Remain the same
  • Decrease slightly
A quantity of heat required to change the unit mass of a solid substance, from solid state to liquid state, while the temperature remains constant, is known as
  • Latent heat
  • Sublimation
  • Hoar frost
  • Latent heat of fusion
The latent heat of vaporization of a substance is always
  • Greater than its latent heat of fusion
  • Greater than its latent heat of sublimation
  • Equal to its latent heat of sublimation
  • Less than its latent heat of fusion
The factor not needed to calculate heat lost or gained when there is no change of state is
  • Weight
  • Specific heat
  • Relative density
  • Temperature change
The saturation vapour pressure of water at 100°C is
  • 739 mm of mercury
  • 750 mm of mercury
  • 760 mm of mercury
  • 712 mm of mercury
50 gm of copper is heated to increase its temperature by 10°C. If the same quantity of heat is given to 10 gm of water, the rise in its temperature is (Specific heat of copper = 420 Joule-kg–1° C–1)
  • 5°C
  • 6°C
  • 7°C
  • 8°C
Two liquids A and B are at 32°C and 24°C. When mixed in equal masses the temperature of the mixture is found to be 28°C. Their specific heats are in the ratio of
  • 3 : 2
  • 2 : 3
  • 1 : 1
  • 4 : 3
A metallic ball and highly stretched spring are made of the same material and have the same mass. They are heated so that they melt, the latent heat required
  • Are the same for both
  • Is greater for the ball
  • Is greater for the spring
  • For the two may or may not be the same depending upon the metal
A closed bottle containing water at 30°C is carried to the moon in a space-ship. If it is placed on the surface of the moon, what will happen to the water as soon as the lid is opened
  • Water will boil
  • Water will freeze
  • Nothing will happen on it
  • It will decompose into H2 and O2
The thermal capacity of 40 g of aluminium (specific heat = 0.2 cal/g°/C) is
  • 40 cal/°C
  • 60 cal/°C
  • 200 cal/°C
  • 8 cal/°C
Two rigid boxes containing different ideal gases are placed on a table. Box A contains one mole of nitrogen at temperature T0, while Box B contains one mole of helium at temperature (7/T0. The boxes are then put into thermal contact with each other and heat flows between them until the gases reach a common final temperature (Ignore the heat capacity of boxes). Then, the final temperature of the gases, Tf, in terms of T0 is

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  • 2)
    Physics-Thermal Properties of Matter-90977.png

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A liquid of mass M and specific heat S is at a temperature 2 t. If another liquid of thermal capacity 1.5 times, at a temperature of t/3 is added to it, the
  • 4/3 t
  • t
  • t/2
  • 2/3 t
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 4°C
  • The entire block just melts
  • The block remains unchanged
The weight of a person is 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
Hailstone at 0°C falls from a height of 1 km on an insulating surface converting whole of its kinetic energy into heat. What part of it will melt (g = 10 m/s2)
  • 1/33
  • 1/8

  • Physics-Thermal Properties of Matter-90984.png
  • All of it will melt
Of two masses of 5 kg each falling from height of 10 m, by which 2kg water is stirred. The rise in temperature of water will be
  • 2.6°C
  • 1.2°C
  • 0.32°C
  • 0.12°C
A lead ball moving with a velocity V strikes a wall and stops. If 50% 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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    Physics-Thermal Properties of Matter-90988.png

  • Physics-Thermal Properties of Matter-90989.png

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4200 J of work is required for
  • Increasing the temperature of 10 gm of water through 10°C
  • Increasing the temperature of 100 gm of water through 10°C
  • Increasing the temperature of 1 kg of water through 10°C
  • Increasing the temperature of 10 kg of water through 10°C
The temperature at which the vapour pressure of a liquid becomes equals to the external (atmospheric) pressure is its
  • Melting point
  • Sublimation point
  • Critical temperature
  • Boiling point
When the pressure on water is increased the boiling temperature of water as compared to 100°C will be
  • Lower
  • The same
  • Higher
  • On the critical temperature
A hammer of mass 1 kg having speed of 50 m/s, hit a iron nail of mass 200 gm. If specific heat of iron is 0.105 cal/gm°C and half the energy is converted into heat, the raise in temperature of nail is
  • 7.1°C
  • 9.2°C
  • 10.5°C
  • 12.1°C
A glass flask is filled up to a mark with 50 cc of mercury at 18°C. If the flask and contents are heated to 38°C, how much mercury will be above the mark ? (α for glass is 9 × 10–6/0 C and coefficient of real expansion of mercury is 180 × 10–6/°C)
  • 0.85 cc
  • 0.46 cc
  • 0.153 cc
  • 0.05 cc
The coefficient of apparent expansion of mercury in a glass vessel is 153 × 10–6/°C and in a steel vessel is 144 × 10–6/°C .If a for steel is 12 × 10–6/°C, then that of glass is
  • 9 × 10–6/°C
  • 6 × 10–6/°C
  • 36 × 10–6/°C
  • 27 × 10–6/°C
An iron tyre is to be fitted on to a wooden wheel 1 m in diameter. The diameter of tyre is 6 mm 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 × 10–6 /°C
  • 167°C
  • 334°C
  • 500°C
  • 1000°C
A glass flask of volume one litre at 0°C is filled, level full of mercury at this temperature. The flask and mercury are now heated to 100°C. How much mercury will spill out, if coefficient of volume expansion of mercury is 1.82 × 10–4/°C and linear expansion of glass is 0.1 × 10–4/°C respectively
  • 21.2 cc
  • 15.2 cc
  • 1.52 cc
  • 2.12 cc
A steel scale measures the length of a copper wire as 80.0 cm, when both are at 20°C (the calibration temperature for scale). What would be the scale read for the length of the wire when both are at 40°C ? (Given αsteel = 11 × 10–6 per°C and αcopper = 17 × 10–6 per° C)
  • 80.0096 cm
  • 80.0272cm
  • 1 cm
  • 25.2 cm
Two metal strips that constitute a thermostat necessarily differ in their
  • Mass
  • Length
  • Resistivity
  • Coefficient of linear expansion
A metal ball immersed in alcohol weighs W1 at 0°C and W2 at 59°C. The coefficient of cubical expansion of the metal is less than that of alcohol. Assuming that the density of metal is large compared to that of alcohol, it can be shown that
  • W1 > W2
  • W1 = W2
  • W1 < W2
  • W2 = (W1 / 2)
The coefficient of volumetric expansion of mercury is 18 × 10–5/°C. A thermometer bulb has a volume 10–6 m3 and cross-section of stem is 0.004 cm2. Assuming that bulb is filled with mercury at 0°C then the length of the mercury column at 100°C is
  • 18.8 mm
  • 9.2 mm
  • 7.4 cm
  • 4.5 cm
A piece of metal weighs 46 g in air. When it is immersed in the liquid of specific gravity 1.24 at 27°C it weighs 30 g. When the temperature of liquid is raised to 42°C the metal piece weighs 30.5 g, specific gravity of the liquid at 42°C is 1.20, then the linear expansion of the metal will be
  • 3.316 × 10–5/°C
  • 2.316 × 10–5/°C
  • 4.316 × 10–5/°C
  • None of these
A substance of mass m kg requires a power input of P watts to remain in the molten state at its melting point. When the power is turned off, the sample completely solidifies in time t sec. What is the latent heat of fusion of the substance?

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    Physics-Thermal Properties of Matter-91003.png

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Steam at 100°C is passed into 1.1 kg of water contained in a calorimeter of water equivalent to 0.02 kg at 15°C till the temperature of the calorimeter and its contents rises to 80°C. The mass of the steam condensed in kg is
  • 0.130
  • 0.065
  • 0.260
  • 0.135
A lead bullet at 27°C just melts when stopped by an obstacle. Assuming that 25% of heat is absorbed by the obstacle, then the velocity of the bullet at the time of striking (M.P. of lead = 327°C, specific heat of lead = 0.03 cal/g°C, latent heat of fusion of lead = 6 cal/g and J = 4.2 J/cal)
  • 410 m/s
  • 1230 m/s
  • 307.5 m/s
  • None of these
The temperature of equal masses of three different liquids A, B and C are 12°C, 19°C and 28°C respectively. The temperature when A and B are mixed is 16°C and when B and C are mixed is 23°C. The temperature when A and C are mixed is
  • 18.2°C
  • 22°C
  • 20.2°C
  • 25.2°C
In an industrial process 10 kg of water per hour is to be heated from 20°C to 80°C. To do this steam at 150°C is passed from a boiler into a copper coil immersed in water. The steam condenses in the coil and is returned to the boiler as water at 90oC. How many kg of steam is required per hour. (Specific heat of steam = 1 calorie per goC, Latent heat of vapourisation = 540 cal/g)
  • 1 g
  • 1 kg
  • 10 g
  • 10 kg
The coefficient of linear expansion of crystal in one direction is α1 and that in every direction perpendicular to it is α2. The coefficient of cubical expansion is
  • α1 + α2
  • 2α1 + α2
  • α1 + 2α2
  • None of these
Three rods of equal length I are joined to form an equilateral triangle PQR. 0 is the mid point of PQ. Distance OR remains same for small change in temperature. Coefficient of linear expansion for PR and RQ is same, i.e.,α2 but that for PQ is α1. Then
Physics-Thermal Properties of Matter-91012.png
  • α2 = 3α1
  • α2 = 4α1
  • α1 = 3α2
  • α1 = 4α2
An electric kettle takes 4A current at 220 V. How much time will it take to boil 1 kg of water from temperature 20o C ? The temperature of boiling water is 100oC
  • 12.6 min
  • 4.2 min
  • 6.3 min
  • 8.4 min
10 g of ice at –20°C is dropped i nto a calorimeter containing 10 g of water at 10°C; the specific heat of water is twice that of ice. When equilibrium is reached, the calorimeter will contain
  • 20 g of water
  • 20 g of ice
  • 10 g ice and 10 g water
  • 5 g ice and 15 g water
A rod of length 20 cm is made of metal. It expands by 0.075 cm when its temperature is raised from 0°C to 100°C. Another rod of a different metal B having the same length expands by 0.045 cm for the same change in temperature. A third rod of the same length is composed of two parts, one of metal A and the other of metal B. This rod expands by 0.060 cm for the same change in temperature. The portion made of metal A has the length
  • 20 cm
  • 10 cm
  • 15 cm
  • 18 cm
The graph AB shown in figure is a plot of temperature of a body in degree celsius and degree Fahrenheit.Then
Physics-Thermal Properties of Matter-91017.png
  • Slope of line AB is 9/5
  • Slope of line AB is 5/9
  • Slope of line AB is 1/9
  • Slope of line AB is 3/9
The portion AB of the indicator diagram representing the state of matter denotes
Physics-Thermal Properties of Matter-91019.png
  • The liquid state of matter
  • Gaseous state of matter
  • Change from liquid to gaseous state
  • Change from gaseous state to liquid state
A solid substance is at 30°C. To this substance heat energy is supplied at a constant rate. Then temperature versus time graph is as shown in the figure. The substance is in liquid state for the portion (of the graph)
Physics-Thermal Properties of Matter-91020.png
  • BC
  • CD
  • ED
  • EF
If a graph is plotted taking the temperature in Fahrenheit along Y-axis and the corresponding temperature in Celsius along the X-axis, it will be a straight line
  • Having a +ve intercept on Y-axis
  • Having a +ve intercept on X-axis
  • Passing through the origin
  • Having a–ve intercepts on both the axis
Which of the curves in figure represents the relation between Celsius and Fahrenheit temperatures
Physics-Thermal Properties of Matter-91022.png
  • 1
  • 2
  • 3
  • 4
Heat is supplied to a certain homogenous sample of matter, at a uniform rate. Its temperature is plotted against time, as shown. Which of the following conclusions can be drawn
Physics-Thermal Properties of Matter-91024.png
  • Its specific heat capacity is greater in the solid state than in the liquid state
  • Its specific heat capacity is greater in the liquid state than in the solid state
  • Its latent heat of vaporisation is greater than its latent heat of fusion
  • Its latent heat of vaporisation is smaller than its latent of fusion
  • Both (and (3)
A student takes 50 g wax (specific heat = 0.6 kcal/kg°C) and heats it till it boils. The graph between temperature and time is as follows. Heat supplied to the wax per minute and boiling point are respectively
Physics-Thermal Properties of Matter-91025.png
  • 500 cal, 50°C
  • 1000 cal, 100°C
  • 1500 cal, 200°C
  • 1000 cal, 200°C
0:0:1


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