Properties of Solids & Liquids (NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics): Questions 80  83 of 190
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Question number: 80
» Properties of Solids & Liquids » Surface Energy and Surface Tension
Question
A solid sphere of density n ( > 1) times lighter than water is suspended in a water tank by a string tied to its base as shown in fig. If the mass of the sphere is m then the tension in the string is given by
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


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Question number: 81
» Properties of Solids & Liquids » Thermal Expansion
Question
3 kg of ice at  20°C is mixed with 10 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.  15 kg 

b.  12.125 kg 

c.  47.5 kg 

d.  6.435 kg 

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Question number: 82
» Properties of Solids & Liquids » Heat Transfer » Convection
Question
For cooking the food, which of the following type of utensil is most suitable
Choices
Choice (4)  Response  

a.  Low specific heat and high conductivity 

b.  High specific heat and low conductivity 

c.  Low specific heat and low conductivity 

d.  High specific heat and high conductivity 

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Question number: 83
» Properties of Solids & Liquids » Heat Transfer » Radiation
Question
Consider two hot bodies B _{1} and B _{2} which have temperature 100° C and 80° C respectively at t = 0. The temperature of surroundings is 40° C. The ratio of the respective rates of cooling R _{1} and R _{2} of these two bodies at t = 0 will be,
Choices
Choice (4)  Response  

a.  R _{1}: R _{2} = 3: 2 

b.  R _{1}: R _{2} = 2: 3 

c.  R _{1}: R _{2} = 5: 4 

d.  R _{1}: R _{2} = 4: 5 

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