CSIR (Council of Scientific & Industrial Research) Physical Sciences: Questions 154  157 of 463
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Question number: 154
» Thermodynamic and Statistical Physics » Classical and Quantum Statistics
Appeared in Year: 2014
Question
Let ; where and are independent and identically distributed Gaussian random variables of mean and standard deviation . Then is – (June)
Choices
Choice (4)  Response  

a.  1 

b. 


c. 


d. 


Question number: 155
» Thermodynamic and Statistical Physics » Introduction to Nonequilibrium Processes
Appeared in Year: 2014
Question
When a gas expands adiabatically from volume and by a quasi – static reversible process, it cools from temperature to . If now the same process is carried out adiabatically and irreversibly, and is the temperature of the gas when it has equilibrated, then – (December)
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 156
» Electromagnetic Theory » Electromagnetic Waves in Free Space
Appeared in Year: 2011
Question
A plane electromagnetic wave is propagating in a lossless dielectric. The electric field is given by , where c is the speed of light in vacuum, , A and are constant and and are unit vectors along the x and z – axes. The relative dielectric constant of the medium, and the constant A are – (June)
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 157
» Thermodynamic and Statistical Physics » Free Energy
Appeared in Year: 2011
Question
If the number density of a free electron gas in three electron gas in three dimensions is increase eight times, its Fermi temperature will –
(December)
Choices
Choice (4)  Response  

a.  Increase by a factor of 4 

b.  Decrease by a factor of 8 

c.  Increase by a factor of 8 

d.  Decrease by a factor of 4 
