NEET (NTANational Eligibility cum Medical Entrance Test) Physics: Questions 1535  1540 of 2142
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Question number: 1535
» Atoms and Nuclei » Radioactive Decay Law
Question
Halflife of Bi ^{210} is 5 days. If we start with 50, 000 atoms of this isotope, the number of atoms left over after 10 days is
Choices
Choice (4)  Response  

a.  5, 000 

b.  25, 000 

c.  20, 000 

d.  12, 500 

Question number: 1536
» 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: 1537
» 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: 1538
» 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: 1539
» 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: 1540
» 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. 

