Properties of Solids & Liquids (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 167  171 of 190
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Question number: 167
» Properties of Solids & Liquids » Elastic Behavior
Question
A wire of cross sectional area 3 mm ^{2} is just stretched between two fixed points at a temperature of 20° C. Determine the tension when the temperature falls to 20° C. Coefficient of linear expansion a = 10 ^{5} °C ^{1} and Y = 2 × 10 ^{11} N/m ^{2}.
Choices
Choice (4)  Response  

a.  120 N 

b.  102 N 

c.  20 N 

d.  120 KN 

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Question number: 168
» Properties of Solids & Liquids » Surface Energy and Surface Tension
Question
The radii of two soap bubbles are r _{1 } and r _{2}. In isothermal conditions, two meet together in vacuum. Then the radius R of the resultant bubble is given by
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


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Question number: 169
» Properties of Solids & Liquids » Surface Energy and Surface Tension
Question
When a body falls in air, the resistance of air depends to a rate extent on the shape of the body, 3 different shapes disc, ball and cigar shape. Identify the combination of air resistances which truly represents the physical situation. (The cross sectional areas are the same).
Choices
Choice (4)  Response  

a.  2 < 3 < 1 

b.  3 < 1 < 2 

c.  3 < 2 < 1 

d.  1 < 2 < 3 

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Question number: 170
» Properties of Solids & Liquids » StressStrain Relationship
Question
A copper rod 2m long is stretched by 1mm. Strain will be 
Choices
Choice (4)  Response  

a.  5 × 10 ^{4}, volumetric 

b.  5 × 10 ^{4}, longitudinal 

c.  10 ^{4}, volumetric 

d.  5 × 10 ^{3}, volumetric 

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Question number: 171
» Properties of Solids & Liquids » Heat Transfer » Conduction
Question
A 10 cm thick ice block is there on the surface of water in a lake. The temperature of air is  10° C; how much time it will take to double the thickness of the block (L = 80 cal/g, K _{ice} = 0.004 erg/sk, ρ _{ice} = 0.92 gm cm ^{3})
Choices
Choice (4)  Response  

a.  51.11 hours 

b.  21 hour 

c.  19.11 hours 

d.  191 hours 

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