Properties of Solids & Liquids (NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics): Questions 165  169 of 190
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Question number: 165
» Properties of Solids & Liquids » Thermal Expansion
Question
A constant volume gas thermometer shows pressure reading of 50 cm and 90 cm of mercury at 0°C and 100°C respectively. When the pressure reading is 60 cm of mercury, the temperature is
Choices
Choice (4)  Response  

a.  40°C 

b.  25°C 

c.  15°C 

d.  12.5°C 

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Question number: 166
» Properties of Solids & Liquids » Latent Heat
Question
A bullet moving with a uniform velocity v, stops sudden after hitting the target and the whole mass melts be m, specific heat S, initial temperature 25°C, melting point 475 °C and the latent heat L. Then v is given by
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


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Question number: 167
» Properties of Solids & Liquids » Elastic Behavior
Question
A wire of cross sectional area 3 mm ^{2} is just stretched between two fixed points at a temperature of 20° C. Determine the tension when the temperature falls to 20° C. Coefficient of linear expansion a = 10 ^{5} °C ^{1} and Y = 2 × 10 ^{11} N/m ^{2}.
Choices
Choice (4)  Response  

a.  120 N 

b.  102 N 

c.  20 N 

d.  120 KN 

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Question number: 168
» Properties of Solids & Liquids » Surface Energy and Surface Tension
Question
The radii of two soap bubbles are r _{1 } and r _{2}. In isothermal conditions, two meet together in vacuum. Then the radius R of the resultant bubble is given by
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


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Question number: 169
» Properties of Solids & Liquids » Surface Energy and Surface Tension
Question
When a body falls in air, the resistance of air depends to a rate extent on the shape of the body, 3 different shapes disc, ball and cigar shape. Identify the combination of air resistances which truly represents the physical situation. (The cross sectional areas are the same).
Choices
Choice (4)  Response  

a.  2 < 3 < 1 

b.  3 < 1 < 2 

c.  3 < 2 < 1 

d.  1 < 2 < 3 

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