Properties of Solids & Liquids (NEET (NTANational Eligibility cum Medical Entrance Test) Physics): Questions 153  157 of 190
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Question number: 153
» Properties of Solids & Liquids » Young's Modulus
Question
A stress of l 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.  98 

b.  9.8 

c.  0.0098 

d.  0.007 

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Question number: 154
» Properties of Solids & Liquids » Elastic Behavior
Question
A spring is stretched by 6 cm when a load of 5.4 × 10 ^{6} dyne is suspended from it. Work done will be
Choices
Choice (4)  Response  

a.  16.2 × 10 ^{6} erg 

b.  8 × 10 ^{6} J 

c.  8.1 × 10 ^{6} erg 

d.  8.1 × 10 ^{6} J 

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Passage
Read the passage given below and answer the questions that follow:
There is a small mercury drop of radius 5.0 mm. A surface P of area 2.0 mm ^{2} is placed at the top of the drop. Atmospheric pressure = 10 ^{5} Pa. Surface tension of mercury = 0.465 N/m. Gravity effect is negligible.
Question number: 155 (1 of 2 Based on Passage) Show Passage
» Properties of Solids & Liquids » Application of Surface Tension
Question
The force exerted by mercury drop on the surface P is
Choices
Choice (4)  Response  

a.  0.3 N 

b.  1.3456 N 

c.  0.10086 N 

d.  0.10023 N 

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Question number: 156 (2 of 2 Based on Passage) Show Passage
» Properties of Solids & Liquids » Application of Surface Tension
Question
The force exerted by air on surface P is
Choices
Choice (4)  Response  

a.  0.2 N 

b.  0.1 N 

c.  1.0023 N 

d.  2.0 N 

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Question number: 157
» Properties of Solids & Liquids » Heat Transfer » Radiation
Question
Two bodies A and B have thermal emissivity of 0.01 and 0.81 respectively. The outer surface areas of the two bodies are the same. The two bodies emit total radiant power at the same rate. The wavelength λ _{B} corresponding to maximum spectral radiance in the radiation from B is shifted from the wavelength corresponding to maximum spectral radiance in the radiation from A, by 1.00 µm. If the temperature of A is 5802 K
(1) The temperature of B is 1934 K
(2) λ _{B} = 1.5 μm
(3) The temperature of B is 11604 K
(4) The temperature of B is 2901 K
Select the correct answers and mark it according to the following codes:
Choices
Choice (4)  Response  

a.  1 and 3 are correct 

b.  1 and 2 are correct 

c.  1, 2 and 3 are correct 

d.  2 and 4 are correct 

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