Properties of Solids & Liquids (NEET (NTANational Eligibility cum Medical Entrance Test) Physics): Questions 140  144 of 190
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Question number: 140
» Properties of Solids & Liquids » Elastic Behavior
Question
The lengths and radii of two wires of same material are respectively L, 2L, and 2R, R. Equal weights are applied on then. If the elongations produced in them are l _{1} and l _{2} respectively then their ratio will be
Choices
Choice (4)  Response  

a.  4: 1 

b.  2: 1 

c.  8: 1 

d.  1: 8 

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Question number: 141
» Properties of Solids & Liquids » Heat Transfer » Conduction
Question
A 5 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, d _{ice} = 0.92 g cm ^{3})
Choices
Choice (4)  Response  

a.  191 hours 

b.  1 hour 

c.  1.91 hours 

d.  19.1 hours 

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Question number: 142
» Properties of Solids & Liquids » Surface Energy and Surface Tension
Question
Two soap bubbles of radii r _{1} and r _{2} equal to 8 cm and 9 cm are touching each other over a common surface S _{1} S _{2}. Its radius will be
Choices
Choice (4)  Response  

a.  45 cm 

b.  58 cm 

c.  20 cm 

d.  72 cm 

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Question number: 143
» Properties of Solids & Liquids » Elastic Behavior
Question
A brass rod is to support a load of 500 N. If its elastic limit is 5.0 × l0 ^{8 } N/m ^{2} its minimum diameter must be 
Choices
Choice (4)  Response  

a.  3.71mm 

b.  1.13mm 

c.  1.26mm 

d.  2.26mm 

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Question number: 144
» Properties of Solids & Liquids » Heat Transfer » Conduction
Question
Consider two hot bodies B _{1} and B _{2} which have temperature 100° C and 60° C respectively at t = 0. The temperature of surroundings is 50° C. The ratio of the respective rates of cooling R _{1} and R _{2} of these two bodies at t = 0 will be
Choices
Choice (4)  Response  

a.  R _{1}: R _{2} = 4: 5 

b.  R _{1}: R _{2} = 3: 2 

c.  R _{1}: R _{2} = 2: 3 

d.  R _{1}: R _{2} = 5: 1 

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