Properties of Solids & Liquids (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 78  81 of 190
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Question number: 78
» Properties of Solids & Liquids » Elastic Behavior
Question
A steel wire of uniform crosssectional area 4 mm ^{2} is heated up to 60° C and clamped rigidly at two ends. If the temperature of wire falls to 40° C then change in tension in the wire will be, if coefficient of linear expansion of steel is 1.1 x 10 ^{5} /°C and young’s modulus of elasticity of steel is 2 × 10 ^{6 } N/m ^{2}.
Choices
Choice (4)  Response  

a.  176 N 

b.  188 N 

c.  144 N 

d.  132 N 

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Question number: 79
» Properties of Solids & Liquids » Heat Transfer » Conduction
Question
Three rods of the same dimension have thermal conductivities 4K, 2K and 2K. They are arranged as shown in fig. with their ends at 100°C, 50°C and 20°C. The temperature of their junction is
Choices
Choice (4)  Response  

a.  67.5°C 

b.  35.3°C 

c.  70.45°C 

d.  50.43°C 

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Question number: 80
» Properties of Solids & Liquids » Surface Energy and Surface Tension
Question
A solid sphere of density n ( > 1) times lighter than water is suspended in a water tank by a string tied to its base as shown in fig. If the mass of the sphere is m then the tension in the string is given by
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


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Question number: 81
» Properties of Solids & Liquids » Thermal Expansion
Question
3 kg of ice at  20°C is mixed with 10 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/°C and 0.5 kcal/kg/°C while the latent heat of fusion of ice is 80 kcal/kg
Choices
Choice (4)  Response  

a.  15 kg 

b.  12.125 kg 

c.  47.5 kg 

d.  6.435 kg 

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