Properties of Solids & Liquids (NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics): Questions 126  130 of 190
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Question number: 126
» Properties of Solids & Liquids » StressStrain Relationship
Question
A copper rod 5 m long is stretched by 1 mm. Strain will be 
Choices
Choice (4)  Response  

a.  2 × 10 ^{4}, longitudinal 

b.  1.2 × 10 ^{4}, volumetric 

c.  2.4 × 10 ^{4}, longitudinal 

d.  1 × 10 ^{3}, volumetric 

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Question number: 127
» Properties of Solids & Liquids » Surface Energy and Surface Tension
Question
When a body falls in air, the resistance of air depends to a rat extent on the shape of the body, 3 different shapes (1.5 cm cube, 2.3 cm cube and 3.1 cm cube). Identify the combination of air resistances which truly represents the physical situation. (The cross sectional areas are the same).
Choices
Choice (4)  Response  

a.  3 < 2 < 1 

b.  2 < 3 < 1 

c.  3 < 1 < 2 

d.  1 < 2 < 3 

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Question number: 128
» Properties of Solids & Liquids » Young's Modulus
Question
Is longitudinal strain and Y its young’s modulus of elasticity then potential energy per unit volume will be
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


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Question number: 129
» Properties of Solids & Liquids » Elastic Behavior
Question
A steel wire of uniform crosssectional area 2 mm ^{2} is heated up to 50°C and clamped rigidly at two ends. If the temperature of wire falls to 30° then change in tension in the wire will be, if coefficient of linear expansion of steel is 1.1 × 10 ^{5} °C ^{1} and young’s modulus of elasticity of steel is 2 × 10 ^{6 } N/m ^{2}.
Choices
Choice (4)  Response  

a.  44 N 

b.  22 N 

c.  132 N 

d.  88 N 

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Question number: 130
» Properties of Solids & Liquids » Heat Transfer » Convection
Question
The rate of loss of heat from a body cooling under conditions of forced convection is proportional to its
(1) Surface area
(2) Excess of temperature over that of surrounding
(3) Heat capacity
(4) Absolute temperature
Select the correct answers and mark it according to the following codes:
Choices
Choice (4)  Response  

a.  1 and 3 are correct 

b.  2 and 4 are correct 

c.  1 and 2 are correct 

d.  1,2 and 3 are correct 

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