CSIR Physical Sciences: Questions 87  90 of 389
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Question number: 87
» Mathematical Methods of Physics » Binomial, Poisson and Normal Distributions
Appeared in Year: 2014
Question
Two independent random variables m and n, which can take the integer values , follow the Poisson distribution, with distinct mean values and respectively. Then, (December)
Choices
Choice (4)  Response  

a.  The probability distribution of the random variable is a binomial distribution.  
b.  The variance of the random variable is equal to .  
c.  The probability distribution of the random variable is also a Poisson distribution.  
d.  The mean value of the random variable is equal to 0. 
Question number: 88
» Mathematical Methods of Physics » Elementary Probability Theory
Appeared in Year: 2012
Question
An unbiased dice is thrown three times successively. The probability that the numbers of dots on the uppermost surface add up to 16 is – (December)
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 89
» Electromagnetic Theory » Scalar and Vector Potentials
Appeared in Year: 2012
Question
The magnetic field corresponding to the vector potential where is a constant vector, is – (June)
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 90
» Electronics and Experimental Methods » Operational Amplifiers
Appeared in Year: 2014
Question
Consider the amplifier circuit comprising of two
If the input ac signal has an impedance of , which of the following statements is true? (December)
Choices
Choice (4)  Response  

a.  is required in the circuit if the output has to follow the phase of the input signal.  
b.  is required in the circuit because the source impedance is much greater than r  
c.  is required in the circuit because the source impedance is much less than R  
d.  can be eliminated from the circuit without affecting the overall gain 