Properties of Solids & Liquids (NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics): Questions 19  22 of 190
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Question number: 19
» Properties of Solids & Liquids » Thermal Expansion
Question
A bimetallic strip is formed out of two identical strips, one of copper and other of brass. The coefficients of linear expansion of the two metals are a _{c} and a _{b}. On heating, the temperature of the strip goes up by ∆T and the strip bends to form an arc of radius of curvature R. Then R is
(1) Inversely proportional to ∆T
(2) Proportional to
(3) Inversely proportional to
(4) Proportional to
Select the correct answers and mark it according to the following codes:
Choices
Choice (4)  Response  

a.  1 and 2 are correct 

b.  1,2 and 3 are correct 

c.  2 and 4 are correct 

d.  1 and 3 are correct 

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Question number: 20
» Properties of Solids & Liquids » Elastic Behavior
Question
The lengths and radii of two wires of same material are respectively L, 3L, and 3R, 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.  1: 18 

b.  8: 1 

c.  2: 1 

d.  1: 8 

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Question number: 21
» Properties of Solids & Liquids » Elastic Behavior
Question
Length of a wire is doubled, when 15 × 10 ^{8} N/m ^{2} stress is applied on it. Its Young’s modulus of elasticity in N/m ^{2} will be
Choices
Choice (4)  Response  

a.  10 × 10 ^{8} 

b.  20 × 10 ^{8} 

c.  15 × 10 ^{8} 

d.  25 × 10 ^{10} 

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Question number: 22
» Properties of Solids & Liquids » Thermal Expansion
Question
A piece of metal weight 46 gm in air, when it is immersed in the liquid of specific gravity 1.24 at 27 °C it weighs 30 gm. When the temperature of liquid is raised to 42°C the metal piece weighs 30.5 gm, specific gravity of the liquid at 42°C is 1.20, then the linear expansion of the metal will be
Choices
Choice (4)  Response  

a.  4.316 × 10 ^{5 } /°C 

b.  2.316 × 10 ^{5 } / ^{o} C 

c.  3.316 × 10 ^{5 } /°C 

d.  Question does not provide sufficient data or is vague 

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