Properties of Solids & Liquids (NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics): Questions 177  180 of 190
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Question number: 177
» Properties of Solids & Liquids » Heat Transfer » Convection
Question
A cylindrical rod with one end in a steam chamber and its other end in ice results in melting of 0.1 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 ¼ that of firth, the rate at which ice melts in gm/sec will be
Choices
Choice (4)  Response  

a.  0.1 

b.  1.6 

c.  0.2 

d.  3.2 

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Question number: 178
» Properties of Solids & Liquids » Elastic Behavior
Question
A spring is stretched by 3 cm when a load of 5.4 × 10 ^{6} dyne is suspended from it. Work done will be
Choices
Choice (4)  Response  

a.  8.1 × 10 ^{6} erg 

b.  8.0 × 10 ^{6} erg 

c.  8.1 × 10 ^{6} J 

d.  8 × 10 ^{6} J 

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Question number: 179
» Properties of Solids & Liquids » Heat Transfer » Conduction
Question
Assertion (Ꭺ)
The equivalent thermal conductivity of two plates of same thickness in contact (series) is less than the smaller value of thermal conductivity.
Reason (Ꭱ)
For two plates of equal thickness in contact (series) the equivalent thermal conductivity is given by
Choices
Choice (4)  Response  

a.  Both Ꭺ and Ꭱ are true but Ꭱ is NOT 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: 180
» Properties of Solids & Liquids » Elastic Behavior
Question
The volume of a solid rubber ball when it is carried from the surface to the bottom of a 200 m deep lake decreases by 0.1 %. The value for bulk modulus of elasticity for rubber will be
Choices
Choice (4)  Response  

a.  2 × l0 ^{6 } Pa 

b.  2 × 10 ^{4} Pa 

c.  2 × l0 ^{4 } Pa 

d.  2 × l0 ^{9 } Pa 

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