
question_answer1) 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? (a for glass is 9 x 10?6/?C and coefficient of real expansion of mercury is 180 x 10?6/?C) [EAMCET 1997]
A) 0.85 cc done
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B) 0.46 cc done
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C) 0.153 cc done
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D) 0.05 cc done
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question_answer2) The coefficient of apparent expansion of mercury in a glass vessel is 153 x 10?6/?C and in a steel vessel is 144 x 10?6/?C. If a for steel is 12 x 10?6/?C, then that of glass is [EAMCET 1997]
A) 9 x 10?6/?C done
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B) 6 x 10?6/?C done
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C) 36 x 10?6/?C done
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D) 27 x 10?6/?C done
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question_answer3) Solids expand on heating because [CPMT 1990]
A) Kinetic energy of the atoms increases done
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B) Potential energy of the atoms increases done
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C) Total energy of the atoms increases done
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D) The potential energy curve is asymmetric about the equilibrium distance between neighbouring atoms done
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question_answer4) An iron tyre is to be fitted on to a wooden wheel 1m 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 x 10?5/?C) [CPMT 1989]
A) 167?C done
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B) 334?C done
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C) 500?C done
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D) 1000?C done
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question_answer5) 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 \[1.82\times {{10}^{4}}/{}^\circ C\] and linear expansion of glass is\[0.1\times {{10}^{4}}/{}^\circ C\] respectively [MNR 1994]
A) 21.2 cc done
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B) 15.2 cc done
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C) 1.52 cc done
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D) 2.12 cc done
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question_answer6) A steel scale measures the length of a copper wire as \[80.0\,cm,\] when both are at \[20{}^\circ C\] (the calibration temperature for scale). What would be the scale read for the length of the wire when both are at \[40{}^\circ C\]? (Given asteel \[=11\times {{10}^{6}}\]per?C and acopper \[=17\times {{10}^{6}}per\,{}^\circ C\]) [CPMT 2004]
A) \[80.0096\,cm\] done
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B) \[80.0272\,cm\] done
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C) \[1\,cm\] done
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D) \[25.2\,cm\] done
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question_answer7) A bimetallic strip is formed out of two identical strips, one of copper and other of brass. The coefficients of linear expansion of the two metals are \[{{\alpha }_{C}}\] and \[{{\alpha }_{B}}\]. On heating, the temperature of the strip goes up by DT and the strip bends to form an arc of radius of curvature R. Then R is [IITJEE (Screening) 1999]
A) Proportional to DT done
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B) Inversely proportional to DT done
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C) Proportional to \[{{\alpha }_{B}}{{\alpha }_{C}}\] done
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D) Inversely proportional to \[{{\alpha }_{B}}{{\alpha }_{C}}\] done
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question_answer8) Two metal strips that constitute a thermostat must necessarily differ in their [IITJEE 1992]
A) Mass done
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B) Length done
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C) Resistivity done
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D) Coefficient of linear expansion done
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question_answer9) A metal ball immersed in alcohol weighs \[{{W}_{1}}\] at 0?C and \[{{W}_{2}}\] 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 [CPMT 1998]
A) \[{{W}_{1}}>{{W}_{2}}\] done
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B) \[{{W}_{1}}={{W}_{2}}\] done
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C) \[{{W}_{1}}<{{W}_{2}}\] done
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D) \[{{W}_{2}}=({{W}_{1}}/2)\] done
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question_answer10) The coefficient of volumetric expansion of mercury is 18 x 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 [Pb. PMT 1998, DPMT 1997, 2001]
A) 18.8 mm done
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B) 9.2 mm done
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C) 7.4 cm done
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D) 4.5 cm done
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question_answer11) A piece of metal weight 46 gm in air, when it is immersed in the liquid of specific gravity 1.24 at 27?C it weighs 30 gm. When the temperature of liquid is raised to 42?C the metal piece weight 30.5 gm, specific gravity of the liquid at 42?C is 1.20, then the linear expansion of the metal will be [BHU 1995]
A) 3.316 x 10?5/?C done
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B) 2.316 x 10?5/?C done
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C) 4.316 x 10?5/?C done
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D) None of these done
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question_answer12) It is known that wax contracts on solidification. If molten wax is taken in a large vessel and it is allowed to cool slowly, then [CBSE PMT 1994]
A) It will start solidifying from the top downward done
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B) It will start solidifying from the bottom upward done
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C) It will start solidifying from the middle, upward and downward at equal rates done
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D) The whole mass will solidify simultaneously done
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question_answer13) 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 [IIT JEE 1992]
A) \[\frac{Pm}{t}\] done
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B) \[\frac{Pt}{m}\] done
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C) \[\frac{m}{Pt}\] done
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D) \[\frac{t}{Pm}\] done
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question_answer14) Steam at 100?C is passed into 1.1 kg of water contained in a calorimeter of water equivalent 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 [IIT 1995]
A) 0.130 done
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B) 0.065 done
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C) 0.260 done
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D) 0.135 done
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question_answer15) 2 kg of ice at ? 20?C is mixed with 5 kg of water at 20?C in an insulating vessel having a negligible heat capacity. Calculate the final mass of water remaining in the container. It is given that the specific heats of water and ice are 1 kcal/kg per ?C and 0.5 kcal/kg/?C while the latent heat of fusion of ice is 80 kcal/kg [IITJEE (Screening) 2003]
A) 7 kg done
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B) 6 kg done
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C) 4 kg done
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D) 2 kg done
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question_answer16) Water of volume 2 litre in a container is heated with a coil of \[1\,kW\] at \[27\,{}^\circ C\]. The lid of the container is open and energy dissipates at rate of \[160\,J/s.\] In how much time temperature will rise from \[27\,{}^\circ C\] to \[77\,{}^\circ C\] [Given specific heat of water is \[4.2\,kJ/kg\]] [IITJEE (Screening) 2004]
A) 8 min 20 s done
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B) 6 min 2 s done
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C) 7 min done
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D) 14 min done
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question_answer17) 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/gm?C, latent heat of fusion of lead = 6 cal/gm and J = 4.2 joule/cal) [IIT 1981]
A) 410 m/sec done
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B) 1230 m/sec done
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C) 307.5 m/sec done
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D) None of the above done
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question_answer18) If two balls of same metal weighing 5 gm and 10 gm strike with a target with the same velocity. The heat energy so developed is used for raising their temperature alone, then the temperature will be higher
A) For bigger ball done
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B) For smaller ball done
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C) Equal for both the balls done
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D) None is correct from the above three done
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question_answer19) 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 [Kerala PET 2005]
A) 18.2?C done
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B) 22?C done
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C) 20.2?C done
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D) 25.2?C done
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question_answer20) 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 90?C. how many kg of steam is required per hour. (Specific heat of steam = 1 calorie per gm?C, Latent heat of vaporisation = 540 cal/gm)
A) 1 gm done
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B) 1 kg done
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C) 10 gm done
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D) 10 kg done
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question_answer21) In a vertical Utube containing a liquid, the two arms are maintained at different temperatures \[{{t}_{1}}\] and \[{{t}_{2}}\]. The liquid columns in the two arms have heights \[{{l}_{1}}\] and \[{{l}_{2}}\] respectively. The coefficient of volume expansion of the liquid is equal to
A) \[\frac{{{l}_{1}}{{l}_{2}}}{{{l}_{2}}{{t}_{1}}{{l}_{1}}{{t}_{2}}}\] done
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B) \[\frac{{{l}_{1}}{{l}_{2}}}{{{l}_{1}}{{t}_{1}}{{l}_{2}}{{t}_{2}}}\] done
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C) \[\frac{{{l}_{1}}+{{l}_{2}}}{{{l}_{2}}{{t}_{1}}+{{l}_{1}}{{t}_{2}}}\] done
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D) \[\frac{{{l}_{1}}+{{l}_{2}}}{{{l}_{1}}{{t}_{1}}+{{l}_{2}}{{t}_{2}}}\] done
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question_answer22) The coefficient of linear expansion of crystal in one direction is \[{{\alpha }_{1}}\] and that in every direction perpendicular to it is \[{{\alpha }_{2}}\]. The coefficient of cubical expansion is
A) \[{{\alpha }_{1}}+{{\alpha }_{2}}\] done
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B) \[2{{\alpha }_{1}}+{{\alpha }_{2}}\] done
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C) \[{{\alpha }_{1}}+2{{\alpha }_{2}}\] done
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D) None of these done
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question_answer23) Three rods of equal length l are joined to form an equilateral triangle PQR. O 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. \[{{\alpha }_{2}}\] but that for PQ is \[{{\alpha }_{1}}\]. Then
A) \[{{\alpha }_{2}}=3{{\alpha }_{1}}\] done
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B) \[{{\alpha }_{2}}=4{{\alpha }_{1}}\] done
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C) \[{{\alpha }_{1}}=3{{\alpha }_{2}}\] done
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D) \[{{\alpha }_{1}}=4{{\alpha }_{2}}\] done
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question_answer24) A one litre glass flask contains some mercury. It is found that at different temperatures the volume of air inside the flak remains the same. What is the volume of mercury in this flask if coefficient of linear expansion of glass is 9 ? 10?6/?C while of volume expansion of mercury is 1.8 ? 10?4/?C
A) 50 cc done
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B) 100 cc done
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C) 150 cc done
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D) 200 cc done
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question_answer25) 10 gm of ice at ? 20?C is dropped into a calorimeter containing 10 gm of water at 10?C; the specific heat of water is twice that of ice. When equilibrium is reached, the calorimeter will contain
A) 20 gm of water done
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B) 20 gm of ice done
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C) 10 gm ice and 10 gm water done
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D) 5 gm ice and 15 gm water done
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question_answer26) A rod of length 20 cm is made of metal. It expands by 0.075cm 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 [CPMT 1991]
A) 20 cm done
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B) 10 cm done
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C) 15 cm done
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D) 18 cm done
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question_answer27) Steam is passed into 22 gm of water at 20?C. The mass of water that will be present when the water acquires a temperature of 90?C (Latent heat of steam is 540 cal/gm) is [SCRA 1994]
A) 24.8 gm done
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B) 24 gm done
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C) 36.6 gm done
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D) 30 gm done
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