JEE Questions for Physics Thermal Properties Of Matter Quiz 1 - MCQExams.com

In which mode of transmission, the heat waves travel along straight line with the speed of light?
  • Thermal radiation
  • Forced convection
  • Natural convection
  • Thermal conduction
If mass energy equivalence is taken into account, when water is cooled to form ice, the mass of water should
  • increase
  • remain unchanged
  • decrease
  • first increase then decrease
In a mercury thermometer, the ice point (lower fixed point) is marked as 10°C and the steam point (upper fixed point) is marked as 130° C At 40°C temperature, what will this thermometer read?
  • 78°C
  • 66°C
  • 62°C
  • 58°C

Physics-Thermal Properties of Matter-90696.png
  • -42° C
  • -72° C
  • 12° C
  • 40° C
The resistance of the wire in the platinum resistance thermometer at ice point is 5 Ω and at steam point is 5.25 Ω . When the thermometer is inserted in an unknown hot bath, its resistance is found to be 5.5 Ω . The temperature of the hot bath is
  • 100° C
  • 200° C
  • 300° C
  • 350° C
Mercury boils at 367°C. However, mercury thermometers are made such that they can measure temperature upto 500°C. This is done by
  • maintaining vacuum above mercury column in the steam of the thermometer
  • filling nitrogen gas at high pressure above the mercury column
  • filling oxygen gas at high pressure above the mercury column
  • filling nitrogen gas at low pressure above the mercury column
On a hilly region, water boils at 95°C. The temperature expressed in Fahrenheit is
  • 100°F
  • 20.3°F
  • 150°F
  • 203°F
The readings of a constant volume gas thermometer at 0°C and 100°C are 40 cm and 60 cm of mercury respectively. If its reading at an unknown temperature is 100 cm of mercury column, then the temperature is
  • 100° C
  • 50° C
  • 25° C
  • 300° C
  • None of these
The temperature, at which Centigrade and Fahrenheit scales give the same reading, is
  • –40°
  • 40°
  • –30°
  • 30°
On Centigrade scale, the temperature of a body increases by 30°. The increase in temperature on Fahrenheit scale is
  • 50°
  • 40°
  • 30°
  • 54°
Infrared radiations are detected by
  • spectometer
  • pyrometer
  • nanometer
  • photometer
The wooden wheel of radius R is made of two semicircular parts (see figure). The two parts are held together by a ring made of a metal strip of cross-sectional area S and length L. L is slightly less than 2πR.To fit the ring on the wheel, it is heated so that its temperature rises by ∆T and it just steps over the wheel. As it cools down to surrounding temperature, it presses the semicircular parts together. If the coefficient of linear expansion of the metal is α and its Young's modulus is Y, the force that one part of the wheel applies on the other part is
Physics-Thermal Properties of Matter-90698.png
  • 2πSYα∆T
  • SYα∆T
  • πSYα∆T
  • 2SYα∆T
An aluminium sphere of 20 cm diameter is heated from 0°C to 100°C. Its volume changes by (given that coefficient of linear expansion for aluminium αAl = 23 x 10-6/°C)
  • 28.9 cc
  • 2.89 cc
  • 9.28 cc
  • 49.8 cc
A metal rod of Young's modulus Y and coefficient of thermal expansion α is held at its two ends such that its length remains invariant. If its temperature is raised by t °C, the linear stress developed in it is

  • Physics-Thermal Properties of Matter-90699.png
  • 2)
    Physics-Thermal Properties of Matter-90700.png

  • Physics-Thermal Properties of Matter-90701.png

  • Physics-Thermal Properties of Matter-90702.png
Which curve shows the rise of temperature with the amount of heat supplied, for a piece of ice?
Physics-Thermal Properties of Matter-90703.png
  • C
  • D
  • A
  • B
There is some change in length when a 33000 N tensile force is applied on a steel rod of area of cross-section 10-3 m2. The change of temperature required to produce the same elongation, if the steel rod is heated, is (the modulus of elasticity is 3 × 1011 Nm-2 and the coefficient of linear expansion of steel is 1.1x 10-5 °C-1)
  • 20° C
  • 15° C
  • 10° C
  • 0° C
Which one of the figure gives the temperature dependence of density of water correctly?

  • Physics-Thermal Properties of Matter-90704.png
  • 2)
    Physics-Thermal Properties of Matter-90705.png

  • Physics-Thermal Properties of Matter-90706.png

  • Physics-Thermal Properties of Matter-90707.png
A solid ball of metal has a concentric spherical cavity within it. If the ball is heated, the volume of the cavity will
  • increase
  • decrease
  • remain unaffected
  • None of these
By increasing the temperature of a liquid, its
  • volume and density decrease
  • volume and density increase
  • volume increases and density decreases
  • volume decreases and density increases
Two uniform brass rods A and B of lengths l and 2l, and radii 2r and r respectively are heated to the same temperature. The ratio of the increase in the volumes of A to that of B is
  • 1 : 1
  • 1 : 2
  • 2 : 1
  • 1 : 4
On heating, the temperature at which water has minimum volume is
  • 0°C
  • 4°C
  • 4 K
  • 100°C
  • –273°C
A clock which keeps correct time at 20°C, is subjected to 40°C. If coefficient of linear expansion of the pendulum is 12 × 10-6° C-1. How much will it gain or lose time?
  • 10.3 s day-1
  • 20.6 s day-1
  • 5 s day-1
  • 20 min day-1
A brass rod of length 500 mm and diameter 3 mm is joined to a steel rod of same length and diameter at 50°C. If the coefficients of linear expansion of brass and steel are 2.5 × 10-5 °C-1 and 1.25 × 10-5 °C-1, then change in length of the combined rod at 200°C is
  • 2.4 mm
  • 2.8 mm
  • 3.2 mm
  • 3.6 mm
A wire 3 m in length and 1 mm in diameter at 30°C is kept in a low temperature at –170°C and is stretched by hanging a weight of 10 kg at one end. The change in length of the wire is (Y = 2 × 1011 Nm-2, g =10 ms-2 and α =1.2 × 10-5°C-I)
  • 5.2 mm
  • 2.5 mm
  • 52 mm
  • 25 mm
The temperature of a thin uniform circular disc, of lm diameter is increased by 10°C. The percentage increase in moment of inertia of the disc about an axis passing through its centre and perpendicular to the circular face. (linear coefficient of expansion =11 × 10-6°C-1)
  • 0.0055
  • 0.011
  • 0.022
  • 0.044
An iron bar of length 10 m is heated from 0°C to 100°C. If the coefficient of linear thermal expansion of iron is 10 × 10-6°C-1, the increase in the length of bar is
  • 0.5 cm
  • 1.0 cm
  • 1.5 cm
  • 2.0 cm
A composite rod made of copper (α=1.8 × 10-5 K-1 ) and steel (α =1.2 × 10-5 K-1 ) is heated. Then,
  • it bends with steel on concave side
  • it bends with copper on concave side
  • it does not expand
  • Data is insufficient
In an experiment, on the specific heat of a metal, a 0.20 kg block of the metal at 150°C is dropped in a copper calorimeter (of water equivalent 0.025 kg) containing 150 cc of water at 27°C. The final temperature is 40°C. Calculate the specific heat of the metal. if heat losses to the surroundings are not negligible, is our answer greater or smaller than the actual value of specific heat of the metal?
  • 0.02
  • 0.2
  • 0.01
  • 0.1
A scientist proposes a new temperature scale in which the ice point in 25 X (X is the new unit of temperature) and the steam point is 305 X. The specific heat capacity of water in this new scale is (in J kg -I X -1 )
  • 4.0 × 103
  • 3.0 × 103
  • 1.2 × 103
  • 1.5 × 103
A steam at 100°C is passed into 1 kg of water contained in a calorimeter of water equivalent 0.2 kg at 9°C till the temperature of the calorimeter and water in it is increased to 90°C. The mass of steam condensed in kg is nearly (specific heat of water =1 cal/g°C, and latent heat of vaporisation = 540 cal/g)
  • 0.81
  • 0.18
  • 0.27
  • 0.54
250 g of water and equal volume of alcohol of mass 200 g are replaced successively in the same calorimeter and cool from 60° to 55° in 130 s and 67 s respectively. If the water equivalent of the calorimeter is 10 g, then the specific heat of alcohol in cal/g°C is
  • 1.25
  • 0.69
  • 0.62
  • 0.67
22320 cal of heat is supplied to 100 g of ice at 0°C. If the latent heat of fusion of ice is 80 cal g -1 and latent heat of vaporisation of water is 540 cal g -1, the final obtained amount of water and its temperature respectively are
  • 8 g, 100° C
  • 100 g, 90° C
  • 92 g, 100° C
  • 82 g, 100° C
In a reversible ideal engine, 650 J of heat comes from source of 450 K, heat rejected to sink at 225 K is
  • 325 J
  • 625 J
  • 700 J
  • 800 J
A lead bullet strikes against a steel plate with a velocity 200 m/s. If the impact is perfectly inelastic and the heat produced is equally shared between the bullet and the target, then the rise in temperature of the bullet is (specific heat capacity of lead =125 Jkg -1 K -1)
  • 80° C
  • 60° C
  • 40° C
  • 120° C
  • 130° C
A piece of ice (heat capacity = 2100 J kg -1° C-1 and latent heat = 3.36 × 105J kg -1) of mass m gram is at –5°C at atmospheric pressure. It is given 420 J of heat, so that the ice starts melting. Finally when the ice-water mixture is in equilibrium, it is found that 1 g of ice has melted. Assuming there is no other heat exchange in the process, the value of m is
  • 8
  • 6
  • 4
  • 8.5
0.1 m3 of water at 80°C is mixed with 0.3 m3 of water at 60°C.The final temperature of the mixture is
  • 65° C
  • 70° C
  • 60° C
  • 75° C
An experiment takes 10 min to raise temperature of water from 0°C and 100°C and another 55 min to convert it totally into steam by a stabilised heater. The latent heat of vaporisation comes out to be
  • 530 cal g -1
  • 540 cal g -1
  • 550 cal g -1
  • 560 cal g -1
When the room temperature becomes equal to the dew point, the relative humidity of the room is
  • 100%
  • zero %
  • 70%
  • 85%
The relative humidity on a day when partial pressure of water vapour is 0.012 × 105 Pa at 12°C is (take, vapour pressure of water at this temperature as 0.016 × 105 Pa)
  • 70%
  • 40%
  • 75%
  • 25%
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
  • 24.2° C
Work done is converting 1 g of ice at -10°C into steam at 100°C is
  • 3045 J
  • 6056 J
  • 721 J
  • 616 J
A copper block of mass 4 kg is heated in a furnance to a temperature 425°C and then placed on a large ice block. The mass of ice that will melt in this process will be (specific heat of copper = 500 J kg-1°C -1 and heat of fusion of ice = 336 kJ kg -1)
  • 0.5 kg
  • 1 kg
  • 1.5 kg
  • 2.5 kg
A block of ice at –10°C is slowly heated and converted to steam at 100°C. Which of the following curves represents this phenomenon qualitatively?

  • Physics-Thermal Properties of Matter-90714.png
  • 2)
    Physics-Thermal Properties of Matter-90715.png

  • Physics-Thermal Properties of Matter-90716.png

  • Physics-Thermal Properties of Matter-90717.png
The sprinkling of water reduces slightly the temperature of a closed room, because
  • temperature of water is less than that of the room
  • specific heat of water is high
  • water has large latent heat of vaporisation
  • water is a bad conductor of heat
Calorie is defined as the amount of heat required to raise temperature of 1 g of water by 1°C and it is defined under which of the following conditions?
  • From 14.5°C to 15.5°C at 760 mm of Hg
  • From 98.5°C to 99.5°C at 760 mm of Hg
  • From 13.5°C to 14.5°C at 76 mm of Hg
  • From 3.5°C to 4.5°C at 76 mm of Hg
A vessel contains 110 g of water. The heat capacity of the vessel is equal to 10 g of water.The initial temperature of water in vessel in 10°C.If 220 g of hot water at 70°C is poured in the vessel, the fmal temperature neglecting radiation loss will be
  • 70°C
  • 80°C
  • 60°C
  • 50°C
Three rods of copper, brass and steel are welded together to from a Y-shaped structure. Area of cross-section of each rod is 4 cm2. End of copper rod is maintained at 100°C whereas ends of brass and steel are kept at 0°C. Lengths of the copper, brass and steel rods are 46 cm, 13 cm and 12 cm respectively. The rods are thermally insulated from surroundings except at ends. Thermal conductivities of copper, brass and steel are 0.92, 0.26 and 0.12 in CGS units, respectively. Rate of heat flow through copper rod is
  • 1.2 cal/s
  • 2.4 cal/s
  • 5.52 cal/s
  • 6.0 cal/s
Two rods (one semicircular and other straight) of same material and of same cross-sectional area are joined as shown in the figure. The points A and B are maintained at different temperature. The ratio of a semicircular rod to the heat transferred through a cross-section of a semicircular rod to the heat transferred through a cross-section of the straight rod in a given time is
Physics-Thermal Properties of Matter-90718.png
  • 2 : π
  • 1 : 2
  • π : 2
  • 3 : 2
Two rectangular blocks, having identical dimensions, can be arranged either in configuration I or in configuration II as shown in the figure. One of the blocks has thermal conductivity K and the other 2K. The temperature difference between the ends along the X-axis is the same in both the configurations. It takes 9s to transport a certain amount of heat from the hot end to the cold end in the configuration I. The time to transport the same amount of heat in the configuration II is
Physics-Thermal Properties of Matter-90719.png
  • 2.0 s
  • 3.0 s
  • 4.5 s
  • 6.0 s
The figure shows the temperatures at four faces of a composite slab consisting of four materials S1 ,S2 , S3 and S4 of identical thickness, through which the heat transfer is steady. Arrange the materials according to their thermal conductivities in decreasing order.
  • S2, S4, S1 , S3
  • S2 = S4, S1 , S3
  • S1 = S2 , S3, S4
  • S1 ,S2, S3, S4
0:0:1


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