Properties of Solids & Liquids (NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics): Questions 31  34 of 190
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Question number: 31
» Properties of Solids & Liquids » Heat Transfer » Conduction
Question
A cylindrical rod with one end in a steam chamber and it other end in ice results in melting of 0.3 gm of ice per second. If the rod is replaced by another with half the length and double the radius of the first and if the thermal conductivity of material of second rod is that of first, the rate at which ice melts in gm/sec will be
Choices
Choice (4)  Response  

a.  3.2 

b.  0.6 

c.  0.1 

d.  0.2 

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Question number: 32
» Properties of Solids & Liquids » Surface Energy and Surface Tension
Question
Assertion (Ꭺ)
The velocity increases, when water flowing in broader pipe enters a narrow pipe.
Reason (Ꭱ)
According to equation of continuity, product of area and velocity is constant.
Choices
Choice (4)  Response  

a.  Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ 

b.  Ꭺ is true but Ꭱ is false 

c.  Both Ꭺ and Ꭱ are false 

d.  Ꭺ is false but Ꭱ is true 

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Question number: 33
» Properties of Solids & Liquids » Young's Modulus
Question
The Young’s modulus of steel is 2 × 10 ^{11} N/m ^{2} and its coefficient of linear expansion is 1.1 × 10 ^{5} per degree. The pressure to be applied to the ends of a steel cylinder to keep its length constant on raising its temperature by 80°C, will be 
Choices
Choice (4)  Response  

a.  2.2 × 10 ^{8} N/m ^{2} 

b.  5.5 × 10 ^{4} N/m ^{2} 

c.  1.8 × 10 ^{6} N/m ^{2} 

d.  1.76 × 10 ^{8 N} /m ^{2} 

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Question number: 34
» Properties of Solids & Liquids » Heat Transfer » Conduction
Question
A solid copper sphere (density ρ and specific heat capacity c) of radius r at an initial temperature 200 K is suspends inside a chamber whose walls are at almost 0 K. The time required (in µ s) for the temperature of the sphere to drop to 100 K is
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


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