Properties of Solids & Liquids (NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics): Questions 27  30 of 190
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Question number: 27
» Properties of Solids & Liquids » Thermal Expansion
Question
2 kg of ice at  20°C is mixed with 5 kg of water at 20°C in an insulating vessel having a negligible heat capacity. Calculate the final mass of water remaining in the container. It is given that the specific heats of water and ice are 1 kcal/kg/°C and 0.5 kcal/kg/°C while the latent heat of fusion of ice is 80 kcal/kg
Choices
Choice (4)  Response  

a.  4 kg 

b.  7 kg 

c.  2kg 

d.  6 kg 

Question number: 28
» Properties of Solids & Liquids » Heat Transfer » Radiation
Question
An ice box used for keeping eatable cold has a total wall, area of 1 meter ^{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 30°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 = 86, 400 seconds)
Choices
Choice (4)  Response  

a.  1552 gm 

b.  776 gm 

c.  11520 gm 

d.  7760 gm 

Question number: 29
» Properties of Solids & Liquids » Heat Transfer » Radiation
Question
f between wavelength λ and λ + dλ, e _{λ} and a _{λ} be the emissive and absorptive powers of a body and E _{λ} be the emissive power of a perfectly black body, then according to Kirchhoff’s law, which is true
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 30
» Properties of Solids & Liquids » Elastic Behavior
Question
The ratio of radii of two wires of same material is 2: 1. If these wires are stretched by equal forces, then the ratio of stresses produced in them will be
Choices
Choice (4)  Response  

a.  4: 1 

b.  1: 2 

c.  2: 1 

d.  1: 4 
