Properties of Solids & Liquids (NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics): Questions 58  61 of 190
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Question number: 58
» Properties of Solids & Liquids » Latent Heat
Question
A lead bullet at 25°C just n tits when stopped by an obstacle. Assuming that 25 % of heat is absorbed by the obstacle, then the velocity of the bullet at the time of striking (M. P. of lead = 320°C, specific heat of lead = 0.02 cal/gm°C, latent heat of fusion of lead = 6 cal/gm and J = 4.2 joule/cal)
Choices
Choice (4)  Response  

a.  4.010 m/sec 

b.  0.365 m/sec 

c.  307.5 m/sec 

d.  None of the above 

Question number: 59
» Properties of Solids & Liquids » Elastic Behavior
Question
A 4.0 m long copper wire of cross sectional area 1.2 cm ^{2} is stretched by a force of 4.8 × 10 ^{3} N stress will be 
Choices
Choice (4)  Response  

a.  4.0 × l0 ^{7 } N/mm ^{2} 

b.  4.0 × l0 ^{7 } KN/m ^{2} 

c.  4.0 × l0 ^{7 } N/m ^{2} 

d.  None of the above 

Question number: 60
» Properties of Solids & Liquids » Thermal Expansion
Question
The apparent coefficient of expansion of a liquid when heated in a copper vessel is C and when heated in a silver vessel is S. If A is the linear coefficient of expansion of copper, then the linear coefficient of expansion of silver
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 61
» Properties of Solids & Liquids » Thermal Expansion
Question
An iron tire is to be fitted on to a wooden wheel 1 m in diameter. The diameter of tire is 6mm smaller than that of wheel. The tire should be heated so that its temperature increases by a minimum of (the coefficient of cubical expansion of iron is 3.6 × 10 ^{5} /°C)
Choices
Choice (4)  Response  

a.  500°C 

b.  167°C 

c.  334°C 

d.  1000°C 
