NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics: Questions 1168  1172 of 2142
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Question number: 1168
» Dual Nature of Matter and Radiation » DeBroglie Relation
Question
A photon and an electron have equal energy E. is proportional to
Choices
Choice (4)  Response  

a. 


b. 


c. 


d.  Not depend upon E 

Question number: 1169
» Thermodynamics » Laws of Thermodynamics » First Law of Thermodynamics
Question
The latent heat of vaporization of water is 2240 J/gm. If the work done in the process of expansion of 1 g of water is 168 J, then increase in internal energy is
Choices
Choice (4)  Response  

a.  1904 J 

b.  2072 J 

c.  2240 J 

d.  2408 J 

Question number: 1170
» 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: 1171
» Dual Nature of Matter and Radiation » Einstein's Photoelectric Equation
Question
The separation between Bragg’s planes in a crystal is 10 Å. Then the wavelength of those Xrays which can be diffracted by this crystal is
(1) 5 Å (2) 10 Å
(3) 20 Å (4) 25 Å
Select the correct answers and mark it according to the following codes:
Choices
Choice (4)  Response  

a.  1 and 2 are correct 

b.  2 and 4 are correct 

c.  1 and 3 are correct 

d.  1, 2 and 3 are correct 

Question number: 1172
» 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 
