Properties of Solids & Liquids (NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics): Questions 147  150 of 190
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Question number: 147
» Properties of Solids & Liquids » Heat Transfer » Conduction
Question
An ice box used for keeping eatable cold has a total wall, area of 1 metre ^{2} and a wall thickness of 5.0 cm. The thermal conductivity of the ice box is K = 0.01 joule/meter °C. is filled with ice at 0° C along with eatables on a day when the temperature is 40°C. The latent heat of fusion of ice is 334 × 10 ^{3} joules/kg. The amount of ice melted in one day is (1 day = 86400 seconds)
Choices
Choice (4)  Response  

a.  7760 gm 

b.  1552 gm 

c.  2776 gm 

d.  2069 gm 

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Question number: 148
» Properties of Solids & Liquids » Young's Modulus
Question
A stress of 2 kg/mm ^{2} is applied on a wire. If the modulus of elasticity of the wire is 10 ^{10} dyne/cm ^{2}, then the percentage increase in the length of the wire will be
Choices
Choice (4)  Response  

a.  0.0098 

b.  0.007 

c.  0.0028 

d.  0.0196 

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Question number: 149
» Properties of Solids & Liquids » Elastic Behavior
Assertion (Ꭺ)
The bridges declared unsafe after a long use.
Reason (Ꭱ)
Elastic strength of bridges losses with time.
Choices
Choice (4)  Response  

a.  Both Ꭺ and Ꭱ are false 

b.  Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ 

c.  Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ 

d.  Ꭺ is true but Ꭱ is false 

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Question number: 150
» Properties of Solids & Liquids » Thermal Expansion
Question
The temperature of equal masses of three different liquids A, B and C are 12°C, 19 ^{0} C and 28°C respectively. The temperature when A and B are mixed is 16°C and who and C are mixed is 23 ^{0} C. The temperature when A and C are mixed is
Choices
Choice (4)  Response  

a.  25.2°C 

b.  22°C 

c.  20.2°C 

d.  18.2°C 

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