Properties of Solids & Liquids (NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics): Questions 89  93 of 190
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Question number: 89
» Properties of Solids & Liquids » Hooke's Law
Question
A wire of length l m and area of cross section 4 × 10 ^{8} m ^{2 } increases in length by 0.4 cm when a force of 14 N is applied. Value of Y for the material of the wire will be
Choices
Choice (4)  Response  

a.  7.23 × 10 ^{11 } kg/m ^{2} 

b.  2.56 × 10 ^{11 } N/m ^{2} 

c.  2.46 × l0 ^{11 } N/mm ^{2} 

d.  8.75 × l0 ^{6 } N/m ^{2} 

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Question number: 90
» Properties of Solids & Liquids » Surface Energy and Surface Tension
Question
A thin metal disc of radius r floats on water surface and bends the surface downwards along the perimeter making an angle 9 with vertical edge of the disc. If the disc displaces a weight of water W and surface tension of water is T, then the weight of metal disc is
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


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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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