Properties of Solids & Liquids (NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics): Questions 14  18 of 190
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Question number: 14
» Properties of Solids & Liquids » Elastic Behavior
Question
A 4.0 m long copper wire of cross sectional area 1.5 cm ^{2} is stretched by a force of 4.8 × 10 ^{3} N stress will be 
Choices
Choice (4)  Response  

a.  4.4 × l0 ^{7 } N/m ^{2} 

b.  5.0 × l0 ^{7 } KN/m ^{2} 

c.  3.2 × l0 ^{7 } N/m ^{2} 

d.  All of the above 

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Question number: 15
» Properties of Solids & Liquids » Heat Transfer » Conduction
Question
Four rods of identical crosssectional area and made from the same metal form the sides of square. The temperature of two diagonally opposite points are T and √2T respectively in the steady state. Assuming that only heat conduction takes place, what will be the temperature difference between other two points
Choices
Choice (4)  Response  

a. 


b.  0 

c. 


d.  All of the above 

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Question number: 16
» Properties of Solids & Liquids » Heat Transfer » Radiation
Assertion (Ꭺ)
The absorbance of a perfect black body is unity.
Reason (Ꭱ)
A perfect black body when heated emits radiations of all possible wavelengths at that temperature.
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: 17
» Properties of Solids & Liquids » Young's Modulus
Question
A rod of length l and area of crosssection A is heated from 0°C to 100°C. The rod is so placed that it is not allowed to increase in length, then the force developed is proportional to
Choices
Choice (4)  Response  

a.  I ^{1} 

b.  A ^{1} 

c.  A 

d.  I 

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Question number: 18
» Properties of Solids & Liquids » Thermal Expansion
Question
A bimetallic strip is heated. Choose wrong statements.
(1) Does not bend at all
(2) Gets twisted in the form of an helix
(3) Bends in the form of an arc with the more expandable metal inside.
(4) Bend in the form of an arc with the more expandable metal outside
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.  1 and 3 are correct 

d.  2 and 4 are correct 

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