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Properties of Matter

81 questions · Physics · NEET
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Properties of Matter

81 questions · Physics · NEET

  1. Consider a water tank shown in the figure. It has one wall at x=L and can be taken to be very wide in the z direction. When filled with a liquid of surface tension S and density ρ, the liquid surface makes angle θ0​(θ0​≪1)… Includes diagram2025 · Q180 · MCQ
  2. The maximum elongation of a steel wire of 1 m length if the elastic limit of steel and its Young's modulus, respectively, are 8×108 N m−2 and 2×1011 N m−2,…2024 · Q173 · MCQ
  3. A thin flat circular disc of radius 4.5 cm is placed gently over the surface of water. If surface tension of water is 0.07 N m−1, then the excess force required to take it away from the surface is2024 · Q182 · MCQ
  4. A metallic bar of Young's modulus, 0.5×1011 N m−2 and coefficient of linear thermal expansion 10−5∘C−1, length 1 m and area of cross-section 10−3 m2…2024 · Q197 · MCQ
  5. An ideal fluid is flowing in a non-uniform cross-sectional tube XY (as shown in the figure) from end X to end Y. If K1​ and K2​ are the kinetic energy per unit volume of the fluid at X and Y respectively, then the correct… Includes diagram2024 · Q155 · MCQ
  6. The amount of elastic potential energy per unit volume (in SI unit) of a steel wire of length 100 cm to stretch it by 1 mm is (if Young's modulus of the wire =2.0×1011Nm−2 ) :2023 · Q142 · MCQ
  7. Which of the following statement is not true?2023 · Q147 · MCQ
  8. The viscous drag acting on a metal sphere of diameter 1 mm, falling through a fluid of viscosity 0.8 Pa s with a velocity of 2 m s−1 is equal to :2023 · Q159 · MCQ
  9. The amount of energy required to form a soap bubble of radius 2 cm from a soap solution is nearly: (surface tension of soap solution =0.03 N m−1 )2023 · Q146 · MCQ
  10. The venturi-meter works on :2023 · Q147 · MCQ
  11. Let a wire be suspended from the ceiling (rigid support) and stretched by a weight W attached at its free end. The longitudinal stress at any point of cross-sectional area A of the wire is :2023 · Q154 · MCQ
  12. Two copper vessels A and B have the same base area but of different shapes. A takes twice the volume of water as that B requires to fill upto a particular common height. Then the correct statement among the following is :2022 · Q141 · MCQ
  13. The terminal velocity of a copper ball of radius 5 mm falling through a tank of oil at room temperature is 10 cm s−1. If the viscosity of oil at room temperature is 0.9 kg m−1 s−1, the viscous drag force is :2022 · Q170 · MCQ
  14. A spherical ball is dropped in a long column of a highly viscous liquid. The curve in the graph shown, which represents the speed of the ball (v) as a function of time (t) is Includes diagram2022 · Q132 · MCQ
  15. If a soap bubble expands, the pressure inside the bubble2022 · Q138 · MCQ
  16. Given below are two statements : One is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : The stretching of a spring is determined by the shear modulus of the material of the spring. Reason (R) : A coil…2022 · Q167 · MCQ
  17. The velocity of a small ball of mass M and density d, when dropped in a container filled with glycerin becomes constant after some time. If the density of glycerin is 2d​, then the viscous force acting on the ball will be :2021 · Q157 · MCQ
  18. A capillary tube of radius r is immersed in water and water rises in it to a height h. The mass of the water in the capillary is 5 g. Another capillary tube of radius 2r is immersed in Water. The mass of water that will rise in this tube…2020 · Q123 · MCQ
  19. A wire of length L, are of cross section A is hanging from a fixed support. The length of the wire changed to L1 when mass M is suspended from its free end. The expression for Young's modulus is :2020 · Q141 · MCQ
  20. A small hole of area of cross-section 2 mm2 present near the bottom of a fully filled open tank of height 2 m. Taking g = 10 m/s2, the rate of flow of water through the open hole would be nearly :2019 · Q114 · MCQ
  21. When a block of mass M is suspended by a long wire of length L, the length of the wire becomes (L + l). The elastic potential energy stored in the extended wire is :2019 · Q116 · MCQ
  22. The unit of thermal conductivity is :2019 · Q128 · MCQ
  23. A soap bubble, having radius of 1 mm, is blown from a detergent solution having a surface tension of 2.5 × 10–2 N/m. The pressure inside the bubble equals at a point Z0 below the free surface of water in a container. Taking g = 10…2019 · Q132 · MCQ
  24. A copper rod of 88 cm and an aluminium rod of unknown length have their increase in length independent of increase in tmperature. The length of aluminium rod is : (αCu = 1.7 × 10–5 K–1 and αAl = 2.2 × 10–5 K–1)2019 · Q157 · MCQ
  25. The power radiated by a black body is P and it radiates maximum energy at wavelength, λ0 . If the temperature of the black body is now changed so that it radiates maximum energy at wavelength 43​λ0​, the power…2018 · Q145 · MCQ
  26. Two wires are made of the same material and have the same volume. The first wire has cross-sectional area A and the second wire has cross-sectional area 3A. If the length of the first wire is increased by Δl on applying a force F,…2018 · Q148 · MCQ
  27. A small sphere of radius ‘r’ falls from rest in a viscous liquid. As a result, heat is produced due to viscous force. The rate of production of heat when the sphere attains its terminal velocity, is proportional to2018 · Q152 · MCQ
  28. The bulk modulus of a spherical object is 'B'. If it is subjected to uniform pressure 'P', the fractional decrease in radius is2017 · Q144 · MCQ
  29. A U tube with both ends open to the atmosphere, is partially filled with water. Oil, which is immiscible with water, is poured into one side until it stands at a distance of 10 mm above the water level on the other side. Meanwhile the… Includes diagram2017 · Q155 · MCQ
  30. A spherical black body with a radius of 12 cm radiates 450 watt power at 500 K. If the radius were halved and the temperature doubled, the power radiated in watt would be2017 · Q156 · MCQ
  31. Two rods A and B of different materials are welded together as shown in figure. Their thermal conductivities are K1 and K2. The thermal conductivity of the composite will be Includes diagram2017 · Q157 · MCQ
  32. A piece of ice falls from a height h so that it melts completely. Only one-quarter of the heat produced is absorbed by the ice and all energy of ice gets converted into heat during its fall. The value of h [Latent heat of ice is 3.4×105…2016 · Q151 · MCQ
  33. Coefficient of linear expansion of brass and steel rods are α1 and α2. Lengths of brass and steel rods are l1 and l2 respectively. If (l1 − l2) is maintained same at all temperatures, which one of the following…2016 · Q152 · MCQ
  34. Two non-mixing liquids of densities ρ and nρ (n > 1) are put in a container. The height of each liquid is h. A solid cylinder of length L and density d is put in this container. The cylinder floats with its axis vertical and…2016 · Q153 · MCQ
  35. A black body is at a temperature of 5760 K. The energy of radiation emitted by the body at wavelength 250 nm is U1, at wavelength 500 nm is U2 and that at 1000 nm is U3. Wien's constant, b = 2.88 × 106 nm K. Which of the following…2016 · Q154 · MCQ
  36. Three liquids of densities ρ1, ρ2 and ρ3 (with ρ1 > ρ2 > ρ3), having the same value of surface tension T, rise to the same height in three identical capillaries. The angles of contact θ1, θ…2016 · Q151 · MCQ
  37. Two identical bodies are made of a material for which the heat capacity increases with temperature. One of these is at 100oC, while the other one is at 0oC. If the two bodies are brought into contact, then, assuming no heat loss, the final…2016 · Q152 · MCQ
  38. A body cools from a temperature 3T to 2T in 10 minutes. The room temperature is T. Assume that Newton's law of cooling is applicable. The temperature of the body at the end of next 10 minutes will be2016 · Q153 · MCQ
  39. A rectangular film of liquid is extended from (4 cm × 2 cm) to (5 cm × 4 cm). If the work done is 3 × 10−4 J, the value of the surface tension of the liquid is2016 · Q154 · MCQ
  40. The value of coefficient of volume expansion of glycerin is 5 × 10−4 K−1. The fractional change in the density of glycerin for a rise of 40oC in its temperature, is2015 · Q142 · MCQ
  41. The cylindrical tube of a spray pump has radius R, one end of which has n fine holes, each of radius r. If the speed of the liquid in the tube is V, the speed of the ejection of the liquid through the holes is2015 · Q143 · MCQ
  42. Water rises to a height h in capillary tube. If the length of capillary tube above the surface of water is made less than h, then2015 · Q144 · MCQ
  43. The Young's modulus of steel is twice that of brass. Two wires of same length and of same area of cross section, one of steel and another of brass are suspended from the same roof. If we want the lower ends of the wires to be at the same…2015 · Q145 · MCQ
  44. The two ends of a metal rod are maintained at temperatures 100oC and 110oC. The rate of heat flow in the rod is found to be 4.0 J/s. If the ends are maintained at temperatures 200oC and 210oC, the rate of heat flow will be2015 · Q147 · MCQ
  45. A wind with speed 40 m/s blows parallel to the roof of a house. The area of the roof is 250 m2. Assuming that the pressure inside the house is atmospheric pressure, the force exerted by the wind on the roof and the direction of the force…2015 · Q148 · MCQ
  46. On observing light from three different starts P, Q and R, it was found that intensity of violet colour is maximum in the spectrum of P, the intensity of green colour is maximum in the spectrum of R and the intensity of red colour is…2015 · Q149 · MCQ
  47. The approximate depth of an ocean is 2700 m. The compressiblity of water is 45.4 × 10−11 Pa−1 and density of water is 103 kg/m3. What fractional compression of water will be obtained at the bottom of the ocean?2015 · Q150 · MCQ
  48. Copper of fixed volume V is drawn into wire of length l. When this wire is subjected to a constant force F, the extension produced in the wire is Δl. Which of the following graphs is a straight line ?2014 · Q139 · MCQ
  49. A certain number of spherical drops of a liquid of radius r coalesce to form a single drop of radius R and volume V. If T is the surface tension of the liquid, then2014 · Q151 · MCQ
  50. Steam at 100oC is passed into 20 g of water at 10oC. When water acquires a temperature of 80oC, the mass of water present will be [Take specific heat of water = 1 cal g−1 oC−1 and latent heat of steam = 540 cal g−1]2014 · Q152 · MCQ
  51. Certain quantity of water cools from 70oC to 60oC in the first 5 minutes and to 54oC in the next 5 minutes. The temperature of the surroundings is2014 · Q153 · MCQ
  52. If the ratio of diameters, lengths and Young's modulus of steel and copper wires shown in the figure are p, q and s respectively, then the corresponding ratio of increase in their lengths would be Includes diagram2013 · Q144 · MCQ
  53. Two metal rods 1 and 2 of same lengths have same temperature difference between their ends. Their thermal conductivities are K1 and K2 and cross sectional areas A1 and A2, respectively. If the rate of heat conduction in 1 is four times…2013 · Q155 · MCQ
  54. A fluid is in streamline flow across a horizontal pipe of variable area of cross section. For this which of the following statements is correct?2013 · Q156 · MCQ
  55. The density of water at 20oC is 998 kg/m3 and at 40oC is 992 kg/m3. The coefficient of volume expansion of water is2013 · Q157 · MCQ
  56. A piece of iron is heated in a flame. It first becomes dull red then becomes reddish yellow and finally turns to white hot. The correct explanation for the above observation is possible by using2013 · Q141 · MCQ
  57. The molar specific heats of an ideal gas at constant pressure and volume are denoted by Cp and Cv, respectively. If γ = Cv​Cp​​ and R is the universal gas constant, then Cv is equal to2013 · Q152 · MCQ
  58. The following four wires are made of the same material. Which of these will have the largest extension when the same tension is applied?2013 · Q153 · MCQ
  59. The wettability of a surface by a liquid depends primarily on2013 · Q154 · MCQ
  60. A slab of stone of area 0.36 m2 and thickness 0.1 m is exposed on the lower surface to steam at 100oC. A block of ice at 0oC rests on the upper surface of the slab. In one hour 4.8 kg of ice is melted. The thermal conductivity of slab is…2012 · Q98 · MCQ
  61. If the radius of a star is R and it acts as a black body, what would be the temperature of the star, in which the rate of energy production is Q?2012 · Q165 · MCQ
  62. Liquid oxygen at 50 K is heated to 300 K at constant pressure of 1 atm. The rate of heating is constant. Which one of the following graphs represents the variation of temperature with time ?2012 · Q166 · MCQ
  63. A cylindrical metallic rod in thermal contact with two reservoirs of heat at its two ends conducts an amount of heat Q in time t. The metallic rod is melted and the material is formed into a rod of half the radius of the original rod. What…2010 · Q177 · MCQ
  64. The total radiant energy per unit area, normal to the direction of incidence, received at a distance R from the centre of a star of radius r, whose outer surface radiates as a black body at a temperature TK is given by2010 · Q178 · MCQ
  65. Assuming the sun to have a spherical outer surface of radius r, radiating like a black body at temperature toC, the power received by a unit surface, (normal to the incident rays) at a distance R from the centre of the sun is where σ…2010 · Q179 · MCQ
  66. A black body at 227oC radiates heat at the rate of 7 cals/cm2s. At a temperature of 727oC, the rate of heat radiated in the same units will be2009 · Q165 · MCQ
  67. The two ends of a rod of length L and a uniform cross-sectional area A are Kept at two temperatures T1 and T2 (T1 > T2). The rate of heat transfer, dtdQ​ through the rod in a steady state is given by :2009 · Q166 · MCQ
  68. On a new scale of temperature (which is linear) and called the W scale, the freezing and boiling points of water are 39oW and 239oW respectively. What will be the temperature on the new scale, corresponding to a temperature of 39oC on the…2008 · Q157 · MCQ
  69. Assuming the sun to have a spherical outer surface of radius r, radiating like a black body at temperature toC, the power received by a unit surface, (normal to the incident rays) at a distance R from the centre of the sun is where σ…2007 · Q140 · MCQ
  70. A black body is at 727oC. It emits energy at a rate which is proportional to2007 · Q141 · MCQ
  71. A black body at 1227oC emits radiations with maximum intensity at a wavelength of 5000 A∘​. If the temperature of the body is increased by 1000oC, the maximum intensity will be observed at2006 · Q164 · MCQ
  72. Which of the following rods, (given radius r and length l) each made of the same material and whose ends are maintained at the same temperature will conduct most heat ?2005 · Q165 · MCQ
  73. If λm denotes the wavelength at which the radioactive amission from a black body at a temperature TK is maximum, then2004 · Q153 · MCQ
  74. Consider a compound slab consisting of two different materials having equal thicknesses and thermal conductivities K and 2K, respectively. The equivalent thermal conductivity of the slab is2003 · Q165 · MCQ
  75. For a black body at temperature 727oC, its radiating power is 60 watt and temperature of surrounding is 227oC. If temperature of black body is changed to 1227oC then its radiating power will be2002 · Q152 · MCQ
  76. Unit of Stefan's constant is2002 · Q162 · MCQ
  77. Consider two rods of same length and different specific heats (S1, S2), conductivities (K1, K2) and area of cross-sections (A1, A2) and both having temperatures T1 and T2 at their ends. If rate of loss of heat due to conduction is equal,…2002 · Q163 · MCQ
  78. Which of the following is best close to an ideal black body?2002 · Q164 · MCQ
  79. The Wien's displacement law express relation between2002 · Q165 · MCQ
  80. A cylindrical rod having temperature T1 and T2 at its end. The rate of flow of heat Q1 cal/sec. If all the linear dimension are doubled keeping temperature constant, then rate of flow of heat Q2 will be2001 · Q161 · MCQ
  81. A black body has maximum wavelength λm at 2000 K. Its corresponding wavelength at 3000 K will be2000 · Q158 · MCQ