NEET Physics: Questions 1537  1541 of 2099
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Question number: 1537
» Thermodynamics » Concept of Temperature
Question
The temperature of sink of Carnot engine is 27°C and Efficiency of engine is 25%. Then temperature of source
Choices
Choice (4)  Response  

a.  127°C  
b.  327°C  
c.  27ºC  
d.  227ºC 
Question number: 1538
» Atoms and Nuclei » MassEnergy Relation
Question
Sun radiate energy in all direction. The average energy received at earth is 1.4 KW/m ^{2}. The average distance between the earth and the sun is 1.5 ⨯ 10 ^{n} m. If this energy is released by conservation of mass into energy, then the mass lost per day by the sun is approximately (Use l day = 86400 sec)
Choices
Choice (4)  Response  

a.  3.8 ⨯ 10 ^{14} kg.  
b.  7.6 ⨯ 10 ^{14} kg  
c.  3.8 ⨯ 10 ^{12} kg  
d.  4.4 ⨯ 10 ^{9} kg 
Question number: 1539
» Atoms and Nuclei » Radioactivity
Question
If _{92} U ^{238} undergoes successively 8 α decays and 6 β decays, then resulting nucleus is,
Choices
Choice (4)  Response  

a.  _{82} U ^{206}  
b.  _{82} U ^{214}  
c.  _{82} U ^{210}  
d.  _{82} Pb ^{206} 
Question number: 1540
» Thermodynamics » Concept of Temperature
Question
How much work to be done in decreasing the volume of and ideal gas by an amount of 1.4 × 10 ^{4} m ^{3} at normal temperature and constant normal pressure of 1 × 10 ^{5}N/ m ^{2}
Choices
Choice (4)  Response  

a.  14 Joule  
b.  28 Joule  
c.  25 Joule  
d.  27 Joule 
Question number: 1541
» Thermodynamics » Thermal Equilibrium
Question
A monoatomic ideal gas, initially at temperature T _{1} is enclosed in a cylinder fitted with a frictionless piston. The gas is allowed to expand adiabatically to a temperature T _{2 } by releasing the piston suddenly. If I _{1 } and I _{2} are the lengths of the gas column before and after expansion respectively, then is given by
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 
