Question no's in A2 version of CSE PGCET 2012 is followed. You can like answer to corresponding question. Comments are most welcome, please mention question no. or part of question while commenting.
Q30: Variance of X =
A)
B)
C)
D) E[(x2)] - [E(x)]2
Ans:D, E[(x2)] - [E(x)]2
Expln: Refer defn, last expansion. http://en.wikipedia.org/wiki/Variance#Definition
Scope for correctness:
Reason or reference: Wiki
Like this answer, if u agree..
Q54: In a paged memory, the page hit ratio is 0.35. The time required to access a page in secondary memory is equal to 100 ns. The time required to access a page in primary memory is 10ns. The average time required to access a page is ?
A) 3.0ns
B) 68.0ns
C) 68.5ns
D) 78.5ns
Ans:C,68.5ns
Expln: Time to access page in primary =0.35*10=3.5ns.
Miss ratio =(1-0.35)=0.65
Missed pages will in secondary memory.
Time to access page in secondary memory =Miss ratio*time for secondary memory
=(1-0.35)*100=65.0ns
Average time req is= Ts+Tp =65.0ns+3.5ns=68.5ns
Scope for correctness:
Reason or reference:
Like this answer, if u agree..
Question 57 in A2 Version.
Q57: A bag contain 8 white balls and 6 red balls. The probability of drawing two balls of same colour is ?
A) 43/83
B) 43/91
C) 43/93
D) 43/90
Ans:B,43/91
Expln: probability of drawing two balls of white colour is (8/14)*(7/13) = 56/182
probability of drawing two balls of red colour is (6/14)*(5/13) = 30/182
The probability of drawing two balls of same colour is 56/182 + 30/182 = 86/182 = 43/91
Scope for correctness:
Reason or reference:
Like this answer, if u agree..
Question 58 in A2 Version.
Q58: Number of lines that can be drawn through 10 points on a circle ?
A) 40
B) 50
C) 10
D) 45
Ans: D,45
Expln: From below link, search general formula, n(n-1)/2. 10(10-1)/2=45.
http://www.algebra.com/algebra/homework/NumericFractions/Numeric_Fractions.faq.question.134264.html
Scope for correctness:10 out of 10.
Reason or reference: http://www.algebra.com
Like this answer, if u agree..
Question 65 in A2 Version.
Q65: In a crossbar with 1000 crosspoints, approximately how many are in use at any time?
A) 100
B) 250
C) 500
D) 1000
Ans:B,250
Expln: From below link, select Question 5 with B,250 & submit, view ans for 5th ques. http://highered.mcgraw-hill.com/sites/0072515848/student_view0/chapter8/mixed_quiz.html
Scope for correctness:10 out of 10.
Reason or reference: Data Communications and Networking, 3/e, Behrouz A Forouzan, DeAnza College. McGraw-Hill Publications(MGHP)
Like this answer, if u agree..
Q30: Variance of X =
A)
B)
C)
D) E[(x2)] - [E(x)]2
Ans:D, E[(x2)] - [E(x)]2
Expln: Refer defn, last expansion. http://en.wikipedia.org/wiki/Variance#Definition
Scope for correctness:
Reason or reference: Wiki
Like this answer, if u agree..
Q54: In a paged memory, the page hit ratio is 0.35. The time required to access a page in secondary memory is equal to 100 ns. The time required to access a page in primary memory is 10ns. The average time required to access a page is ?
A) 3.0ns
B) 68.0ns
C) 68.5ns
D) 78.5ns
Ans:C,68.5ns
Expln: Time to access page in primary =0.35*10=3.5ns.
Miss ratio =(1-0.35)=0.65
Missed pages will in secondary memory.
Time to access page in secondary memory =Miss ratio*time for secondary memory
=(1-0.35)*100=65.0ns
Average time req is= Ts+Tp =65.0ns+3.5ns=68.5ns
Scope for correctness:
Reason or reference:
Like this answer, if u agree..
Question 57 in A2 Version.
Q57: A bag contain 8 white balls and 6 red balls. The probability of drawing two balls of same colour is ?
A) 43/83
B) 43/91
C) 43/93
D) 43/90
Ans:B,43/91
Expln: probability of drawing two balls of white colour is (8/14)*(7/13) = 56/182
probability of drawing two balls of red colour is (6/14)*(5/13) = 30/182
The probability of drawing two balls of same colour is 56/182 + 30/182 = 86/182 = 43/91
Scope for correctness:
Reason or reference:
Like this answer, if u agree..
Question 58 in A2 Version.
Q58: Number of lines that can be drawn through 10 points on a circle ?
A) 40
B) 50
C) 10
D) 45
Ans: D,45
Expln: From below link, search general formula, n(n-1)/2. 10(10-1)/2=45.
http://www.algebra.com/algebra/homework/NumericFractions/Numeric_Fractions.faq.question.134264.html
Scope for correctness:10 out of 10.
Reason or reference: http://www.algebra.com
Like this answer, if u agree..
Question 65 in A2 Version.
Q65: In a crossbar with 1000 crosspoints, approximately how many are in use at any time?
A) 100
B) 250
C) 500
D) 1000
Ans:B,250
Expln: From below link, select Question 5 with B,250 & submit, view ans for 5th ques. http://highered.mcgraw-hill.com/sites/0072515848/student_view0/chapter8/mixed_quiz.html
Scope for correctness:10 out of 10.
Reason or reference: Data Communications and Networking, 3/e, Behrouz A Forouzan, DeAnza College. McGraw-Hill Publications(MGHP)
Like this answer, if u agree..
No comments:
Post a Comment