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This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
A body cools from `60^(@)C` to `52^(@)C` in 5 minutes what will be the further fall in its temperature in the next five minutes? If the temperature of the surrounding is `28^(@)C`A. `46^(@)C`B. `40^(@)C`C. `36^(@)C`D. `48^(@)C` |
| Answer» Correct Answer - A | |
| 52. |
The thermal capacities of two bodies A and B are in the ratio 1:4. if the rate of heat loss are equal for these two bodies then the rate of fall of the temperature will be in the ratioA. `1:1`B. `1:4`C. `4:1`D. `(4)^(1//4):1` |
| Answer» Correct Answer - C | |
| 53. |
If the temperature of a black body is increased then the wavelength corresponding to the maximum emission willA. shift towards smaller wavelengthB. shift towards longer wavelengthC. not shiftD. shift in proportion to increase in temperature |
| Answer» Correct Answer - A | |
| 54. |
If the rate of emission of radiation by a body at temperature `TK` is `E` then graph between log `E` and log `T` will be .A. B. C. D. |
| Answer» Correct Answer - C | |
| 55. |
The coefficient of absorption of the thermal radiation ofblack body isA. dependent on wavelength of incident radiationB. dependent on temperatureC. independent to the nature of the surfaceD. independent of wavelengths |
| Answer» Correct Answer - A | |
| 56. |
The substance which are transparent to thermal radiation areA. athermanousB. diathermanousC. thermo electricD. radioactive |
| Answer» Correct Answer - B | |
| 57. |
The sum of the absorptance, reflectance and transmittance of a body isA. 1B. 2C. 3D. `oo` |
| Answer» Correct Answer - A | |
| 58. |
When a gas is suddenly compressed, its temperature rises. Why?A. velocity of the bulletB. material of the bulletC. mass of the bulletD. all of these |
| Answer» Correct Answer - C | |
| 59. |
Average density of a gas at constant temperatureA. increases due to collisionB. decreases due to collisionC. does not change with collisionD. increases or decreases depending upon nature of a gas |
| Answer» Correct Answer - C | |
| 60. |
The relation between principal specific heats of gases at constant pressure annd at volume isA. `c_(p)-C_(V)=R//JM`B. `c_(p)+c_(v)=R//JM`C. `c_(p)-c_(v)=JM//R`D. `c_(p)+c_(v)=JM//R` |
| Answer» Correct Answer - A | |
| 61. |
Given samples of 1 c.c. of hydrogen and 1 c.c. of oxygen, both at N.T.P. which sample has a larger number of molecules?A. hydrogen sample has more moleculesB. oxygen samples has more moleculesC. both samples have equal number of moleculesD. hydrogen samples has more or less number of moles than oxygen samples |
| Answer» Correct Answer - C | |
| 62. |
Graph for specific heat at constant volume for a monoatomic gasA. B. C. D. |
| Answer» Correct Answer - B | |
| 63. |
The relation between molar specific heat and principal specific heats isA. Molar specific heat=molecular weight`xx`principal specific heatB. Principal specific heat=molecular weight`xx`molar specific heatC. molar specific heat=principal specific heatD. molar specific heat and principal specific heat product is constant |
| Answer» Correct Answer - A | |
| 64. |
Which of the following can be used to estimate the temperature of a star ?A. Radiation spectrumB. speed of the starC. shape of the starD. Distance from the earth |
| Answer» Correct Answer - B | |
| 65. |
A star which appears blue will beA. hotter than the sunB. colder than the sunC. having nearly the same temperature as that of the sunD. nothing can be predicted |
| Answer» Correct Answer - A | |
| 66. |
In a given process on an ideal gas, `dW=0 and dQlt0.` Then for the gasA. volume increasesB. pressure decreasesC. temperature decreasesD. temperature increases |
| Answer» Correct Answer - C | |
| 67. |
In a given process on an ideal gas, `dW=0 and dQlt0.` Then for the gasA. temperature will decreasesB. volume will increaseC. temperature wil increasesD. pressure remains constant |
| Answer» Correct Answer - A | |
| 68. |
A molecule of a perrfect gas travels, between two successive collisions along aA. parabolic bothB. straight-lineC. curved pathD. zigzag path |
| Answer» Correct Answer - B | |
| 69. |
Kinetic theory of gases is based upon the assumptionsA. matter consists of minute particlesB. the molcules are constantly in a state of random motionC. there exist no intermolecular force between the moleculesD. all of these |
| Answer» Correct Answer - D | |
| 70. |
The best ideal black body isA. lamp of charcoal heated to a high temperatureB. metal coated with a black dyeC. glass surface coated with colterD. hollow enclosure blackened inside and having a small hole |
| Answer» Correct Answer - D | |
| 71. |
Which of the following will radiate heat to a large extent?A. Rough surfaceB. Black and rough surfaceC. Polished surfaceD. Black-polished surface |
| Answer» Correct Answer - B | |
| 72. |
The intermolecular force between the molecules increasesA. when the distance between the molecules increasesB. When the distance between the molecules decreasesC. when the distance remains constantD. none of the above |
| Answer» Correct Answer - B | |
| 73. |
According to kinetic theory of gas, the average kinetic energy of a gas molecule can be determined by knowingA. the number of molecules in the gas onlyB. the pressure of the gas onlyC. the pressure of the gas onlyD. none of the above is enough by itself |
| Answer» Correct Answer - C | |
| 74. |
The mean kinetic energy per unit volume of gas (E) is related to average pressure P, exerted by the gas isA. 3/2 EB. 2/3 EC. 1/3 ED. E |
| Answer» Correct Answer - B | |
| 75. |
If the temperature of the sun increases by 100%, the maximum energy radiated by the sun would correspond toA. radio wave regionB. ultra violet regionC. infrared regionD. visible region |
| Answer» Correct Answer - B | |
| 76. |
Calorie per degree kelvin is the unit ofA. temperatureB. specific heatC. thermal capacityD. mechanical equivalent of heat |
| Answer» Correct Answer - C | |
| 77. |
The mean kinetic energy of one mole or gas per degree ofA. 1/2 KTB. 3/2 RTC. 1/2 RTD. 3/2 KT |
| Answer» Correct Answer - A | |
| 78. |
The absolute temperature of a gas is determined byA. average momentum of the moleculesB. velocity of sound in gasC. number of molecule in the gasD. mean square velocity of the gas molecules |
| Answer» Correct Answer - D | |
| 79. |
The motion of a gas molecule which determines the temperature inA. translatoryB. rotatoryC. vibratoryD. all types of motion |
| Answer» Correct Answer - A | |
| 80. |
The specific heat of water at boiling point isA. zeroB. oneC. infinityD. less than one |
| Answer» Correct Answer - C | |
| 81. |
A monoatomic gas molecule has translatory motion alongA. a single axes onlyB. two axes onlyC. three axes onlyD. three axes and rotatory motion zero |
| Answer» Correct Answer - C | |
| 82. |
Generally `C_(P)` isA. greater than `C_(V)`B. equal to `C_(V)`C. less than `C_(V)`D. greater than or equal to |
| Answer» Correct Answer - A | |
| 83. |
At constant pressure , which of the following is true ?A. `c pro sqrt(rho)`B. `c prop r`C. `c prop 1//rho`D. `c prop 1//sqrt(rho)` |
| Answer» Correct Answer - D | |
| 84. |
The MKS units of principal specific heat is,A. kcal/kg KB. kg K/kcalC. J/kg KD. J/gm`.^(@)C` |
| Answer» Correct Answer - A | |
| 85. |
Which of the following substances has the lowest value of specific heatA. glassB. copperC. leadD. mercury |
| Answer» Correct Answer - D | |
| 86. |
In terms of mechanical unit , `C_(p)-C_(v)` =.. Where , `C_(p)` and `C_(v)` are principal specific heats .A. RB. `R//J`C. `R//M`D. `R//MJ` |
| Answer» Correct Answer - D | |
| 87. |
The dimensions of specific resistance areA. `[L^(2)M^(0)T^(-2)K^(-1)]`B. `[L^(2)M^(1)T^(-2)K^(-1)]`C. `[L^(2)M^(0)T^(-2)K^(-2)]`D. `[L^(2)M^(1)T^(2)K^(-2)]` |
| Answer» Correct Answer - A | |
| 88. |
Temperature of gas is a measure ofA. kinetic energy of the gaseous moleculesB. potential energy of the gaseous moleculesC. distance between the molecules of the gasD. kinetic energy and potential energy |
| Answer» Correct Answer - A | |
| 89. |
The mechanical equivalent of heat J isA. a physical quantityB. a dimensional quantityC. a conversion factorD. all of the above |
| Answer» Correct Answer - C | |
| 90. |
Temperature of gas is a measure ofA. average K.E. of the molecules of the gasB. average P.E. of the molecules of the gasC. average distance between the molecules of the gasD. size of the molecules of the gas |
| Answer» Correct Answer - A | |
| 91. |
The amount of heat required to raise the temperature of 1 kg of water `1^(@)K` at constant pressure isA. `c_(p)`B. `C_(P)`C. `c_(v)`D. `C_(V)` |
| Answer» Correct Answer - A | |
| 92. |
Which of the following has the highest specific heat?A. copperB. waterC. hydrogenD. silver |
| Answer» Correct Answer - C | |
| 93. |
An ice block at `0^(@)C` falls from rest at certain height. If 0.1% of ice mels on reching the ground, then the height from which it is realsed `(g=10m//s^(2),L=80cal//gm,J=4.2J//cal)`A. 33.6 mB. 336 mC. 3360 mD. 33.6 Km |
| Answer» Correct Answer - A | |
| 94. |
The value of heat required to raise the temperature of unit mass of gas through 1 K isA. less when pressure is constantB. equal when pressure is constant or volume is constantC. greter when pressure is constantD. greater when volume is constant |
| Answer» Correct Answer - C | |
| 95. |
The molar specific heat at constant volume, for a non linear triatomic gas isA. 3RB. 4RC. 2RD. R |
| Answer» Correct Answer - A | |
| 96. |
Which of the following substance have the highest value of molar specific heat?A. AluminiumB. HydrogenC. CopperD. Water |
| Answer» Correct Answer - B | |
| 97. |
If specific heat of a substance is infinite, it meansA. heat is given outB. heat is taken inC. no change in temperature whether heat is taken in or givne outD. first heat is taken then is given out |
| Answer» Correct Answer - C | |
| 98. |
The specific heat during an adiabatic change isA. zeroB. infinityC. 1D. less than 1 |
| Answer» Correct Answer - A | |
| 99. |
The CGS unit of specific heat isA. cal/`kg^(@)C`B. cal/`gm.^(@)C`C. kcal/gm`.^(@)C`D. erg/gm`.^(@)C` |
| Answer» Correct Answer - B | |
| 100. |
Molar specific heat isA. quantity of heat required to raise temperature of one kg through `1^(@)K`B. quantity of heat required to raise temperature of 1 mole through 1 KC. quantity of heat required to raise temperature of 1 gram through 1 KD. none of the above |
| Answer» Correct Answer - B | |