Properties of Solids & Liquids (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 131  135 of 190
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Question number: 131
» Properties of Solids & Liquids » Elastic Behavior
Question
A uniform steel wire of density 7500 kg/m ^{3} is 2.5 m long and weighs 15.6 x 10 ^{3} kg. It extends by 1.25 mm when loaded by 10 kg. Calculate the value of young’s modulus of elasticity for steel.
Choices
Choice (4)  Response  

a.  2.3 × 10 ^{11} N/m ^{2} 

b.  2.96 × 10 ^{11} N/m ^{2} 

c.  19.6 × 10 ^{11} N/m ^{2} 

d.  None of the above 

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Passage
Read the passage given below and answer the questions that follow:
A bar of cross section A is subjected to equal and opposite tensile forces F at its ends. Consider a plane through the bar making an angle θ with a plane at right angles to the bar as shown in figure.
Question number: 132 (1 of 2 Based on Passage) Show Passage
» Properties of Solids & Liquids » StressStrain Relationship
Question
The shearing stress at the plane, in terms of F, A and θ is
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


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Question number: 133 (2 of 2 Based on Passage) Show Passage
» Properties of Solids & Liquids » StressStrain Relationship
Question
In the above problem, for what value of θ is the tensile stress maximum?
Choices
Choice (4)  Response  

a.  90° 

b.  45° 

c.  30° 

d.  Zero 

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Question number: 134
» Properties of Solids & Liquids » Temperature
Question
50 gm of copper is heated to increase its temperature 10°C. If the same quantity of heat is given to 10 gm water, the rise in its temperature is (Specific heat of copper = 420 Joulekg ^{1} C ^{1})
Choices
Choice (4)  Response  

a.  5°C 

b.  8°C 

c.  7°C 

d.  6°C 

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Question number: 135
» Properties of Solids & Liquids » Heat Transfer » Radiation
Question
A black body is at a temperature of 2550 K. The energy of radiation emitted by this object with wavelength between 499 nm and 500 nm is U _{1} between 999 nm and 1000 nm is U _{2} and between 1499 nm and 1500 nm is U _{3}. The Wein’s constant b = 2.88 × 10 ^{6} nm K. Then
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


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