Properties of Solids & Liquids (NEET (NTANational Eligibility cum Medical Entrance Test) Physics): Questions 91  95 of 190
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Question number: 91
» Properties of Solids & Liquids » Latent Heat
Question
A bullet moving with a uniform velocity v, stops sudden after hitting the target and the whole mass melts be m, specific heat S, initial temperature 28°C, melting point 375 °C and the latent heat L. Then v is given by
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


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Question number: 92
» Properties of Solids & Liquids » Elastic Behavior
Question
Length of a wire is doubled, when 20 × 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 ^{10} 

c.  20 × 10 ^{9} 

d.  20 × 10 ^{8} 

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Question number: 93
» Properties of Solids & Liquids » Heat Transfer » Radiation
Assertion (Ꭺ)
As temperature of a black body is raised, wavelength corresponding to maximum energy reduces.
Reason (Ꭱ)
Higher temperature would mean higher energy and hence higher wavelength.
Choices
Choice (4)  Response  

a.  Ꭺ is false but Ꭱ is true 

b.  Both Ꭺ and Ꭱ are false 

c.  Ꭺ is true but Ꭱ is false 

d.  Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ 

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Question number: 94
» Properties of Solids & Liquids » Surface Energy and Surface Tension
Question
The amount of work done in blowing a soap bubble such that its diameter increases from d to D is (T = surface tension of the solution)
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


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Question number: 95
» Properties of Solids & Liquids » Surface Energy and Surface Tension
Question
Two soap bubbles of radii r _{1} and r _{2} equal to 2.5 cm and 3.9 cm are touching each other over a common surface S _{1} S _{2}. Its radius will be
Choices
Choice (4)  Response  

a.  6.96 cm 

b.  4.45 cm 

c.  6.90 cm 

d.  4.20 cm 

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