Thermal Properties of Matter-Quiz-5

 

THERMAL PROPERTIES OF MATTER QUIZ-5

Dear Readers,

JEE Advanced Physics Syllabus can be referred by the IIT aspirants to get a detailed list of all topics that are important in cracking the entrance examination. JEE Advanced syllabus for Physics has been designed in such a way that it offers very practical and application-based learning to further make it easier for students to understand every concept or topic by correlating it with day-to-day experiences. In comparison to the other two subjects, the syllabus of JEE Advanced for physics is developed in such a way so as to test the deep understanding and application of concepts.

Q41. The molar heat capacity of a certain substance varies with temperature according to the given equation C=27.2+(4×10^(-3) )T The heat necessary to change the temperature of 2 mol of the substance from 300 K to 700 K is

•  3.46×10⁴ J
•  2.33×10³ J
•  3.46×10³ J
•  2.33×10⁴ J

Solution

42. An iron rod of length 50 cm is joined at an end to an aluminium rod of length 100 cm. All measurements refer to 20°C. The coefficients of linear expansion of iron and aluminium are 12×10^(-6)/°C and 24×10^(-6)/°C, respectively. The average coefficient of composite system is

•  36×10^(-6)/°C
•  12×10^(-6)/°C
•  20×10^(-6)/°C
•  48×10^(-6)/°C

Solution

Q43. Two rods of same length and material transfer a given amount of heat in 12 s, when they are joined end to end. But when they are joined lengthwise, they will transfer same heat in same conditions in

•   24 s
•  3 s
•  1.5 s
•  48 s

Solution

Q44. A black body at 200 K is found to emit maximum energy at a wavelength of 14 μm. When its temperature is raised to 1000 K, the wavelength at which maximum energy is emitted is

•  14 μm
•  70 μm
•  2.8 μm
•  -2.8 μm

Solution

Q45. A cup of tea cools from 80°C in 1 min. The ambient temperature is 30°C. In cooling from 60°C to 50°C it will take

•  30 s
•  60 s
•  90 s
•  48 s

Solution
 

Q46. Heat is required to change 1 kg of ice at -20°C into steam. Q_1is the heat needed to warm then ice from -20°C to 0°C,Q_2 is the heat needed to melt the ice, Q_3 is the heat needed to warm the water from 0°C to 100℃ and Q_4 is the heat needed to vapourize the water. Then

•  Q_4>Q_3>Q_2>Q_1
•  Q_4>Q_3>Q_1>Q_2
• Q_4>Q_2>Q_3>Q_1
•  Q_4>Q_2>Q_1>Q_3

Solution

Q47. The coefficient of linear expansion expansion of crystal in one direction is α_1 and that in every direction perpendicular to it is α_2. The coefficient of cubical expansion is

•  α_1+α_2
•  2α_1+α_2
•  α_1+2α_2
•  None of these

Solution

Q48. Water of volume 2 L in a container is heated with a coil of 1 kW at 27℃ . The lid of the container is open and energy dissipates at rate of 160 Js^(-1). In how much time temperature will rise from 27℃ to 77℃ [Given specific heat of water is 4.2 kJ kg^(-1)]

•  8 min 20 s
•  6 min 2 s
•  7 min
•  14 min

Solution

Q49. The coefficient of apparent expansion of a liquid in a copper vessel is C and in a silver vessel S. The coefficient of volume expansion of copper is γ_c. What is the coefficient of linear expansion of silver

•  (C+γ_C+S)/3
•  (C-γ_C+S)/3
•  (C+γ_C-S)/3
•  (C-γ_C-S)/3

Solution

Q50. Certain substance emits only the wavelengths λ_1,λ_2,λ_3 and λ_4 when it is at a high temperature. When this substance is at a colder temperature, it will absorb only the following wavelength

•  λ_1
•  λ_2
•  λ_1and λ_2/span>
• λ_1and λ_2

Solution