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Published on: 02/11/2019
Download CBSE Class 11th Standard CBSE Mathematics question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 11th Standard CBSE Mathematics
Questions + Answers key
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1.
If f is an even function, then prove that \(\overset{lim f(x)}{x\rightarrow 0^{-}}=\overset{lim f(x)}{x\rightarrow 0^{+}}\)
2.
Two die are rolled. Find the probability of getting: (i)a total of 8 or a doublet (ii)an even number on the first die or a total of 7
3.
Find the coordinates of the foci and the vertices, the eccentricity and the length of the latus rectum of the hyperbolas.
3y2-2x2=1
4.
Find two numbers whose A.M. is 34 and G.M. is 16
5.
If A and B are two mutually exclusive events in a sample space such that P(A) = 0.3 and P(B)= 0.6 then find \(P(A\cup B)\)
6.
Reduce the equation 5x - 3y + 11 = 0 to the slope-intercept form and find its slope and intercept.
7.
In how many ways can 5 letters be posted in 4 letter boxes?
8.
Find the intersection of each of the following pairs of sets:
A = {x : x ∊ N, 5 \(\le\) x \(\le\) 10}, B = {x : x ∊ N, 15 \(\le\) x \(\le\) 20}
9.
Evaluate the following limits \(\overset{lim}{x\rightarrow 4}\) \(\frac{4x+3}{x-2}\)
10.
Find the equation of a circle touching both the axis and passing through the point (6, 3).
11.
A and B are two events, such that P(A)=0.42, P(B)=0.48 and P(A and B)=0.16. Determine P(not B)
12.
If A = {3,{4,5},6}, then find the following statement are true?
\(\phi \subset\) A
13.
Consider the following sets \(\phi\) , A = {2,5}, B = {1,2,3,4} and C = {1,2,3,4,5} Insert the correct symbol \(\subset\) or \(\nsubseteq\) between the pair set
A.......C
14.
Find the union of each of the following pair of sets A = {1, 3, 5}, B = {1, 2, 3}
15.
Let n(U) = 700, n(A) = 200, n(B) = 300 and \(n(A\cap B)\) = 100 .Find \(n({ A }^{ ' }\cap { B }^{ ' })\).
1.
We have \(\overset{lim}{x\rightarrow 0^{-}}\)f(x)=\(\overset{lim}{h\rightarrow 0}\)f(0-h)=\(\overset{lim}{h\rightarrow 0}\)f(-h)=\(\overset{lim}{h\rightarrow 0}\)f(h)
[∵ f is an even function so f(- h)=f(h)]
=\(\overset{lim}{h\rightarrow 0}\)f(0+h)=\(\overset{lim}{x\rightarrow 0^{+}}\)f(x)
Thus \(\overset{lim}{x\rightarrow 0^{-}}\)f(x)=\(\overset{lim}{x\rightarrow 0^{+}}\)f(x) when f is an even function.
2.
(i) \(\frac { 5 }{ 18 } \)
(ii) \(\frac { 7 }{ 12 } \)
3.
\(\left( 0,\pm \sqrt { \frac { 5 }{ 6 } } \right) ;\left( 0\pm \frac { 1 }{ \sqrt { 3 } } \right) ;\sqrt { \frac { 5 }{ 2 } } ;\sqrt { 3 } \).
4.
4, 64
5.
0.9
6.
\(y=\frac{5}{3}x,m=\frac{5}{3},c=\frac{11}{3}\)
7.
Since each letter can be posted in any one of 4 letter boxes, so one letter can be posted in 4 ways. There are total 5 letters. So total number of ways =4x4x4x4x4
Answer:1024
8.
{ф}
9.
Here \(\overset{lim}{x\rightarrow 4}\) \(\frac{4x+3}{x-2}\)
putting x = 4
=\(\frac{4\times 4 +3}{4-2}=\frac{16 +3}{2}= \frac{19}{2}\)
10.
x2+ y2 - 6x - 6y + 9 = 0; x2+ y2 - 30x - 30y + 225=0
11.
P(not B) = 1 − P(B)
Ans.0.52
12.
\(\phi \subset A\)
So, statement is true.
13.
Each element of A belongs to C and A\(\neq\) C.
A \(\subset\) C
14.
A \(\cup\) B ={1, 2, 3, 5}
15.
\(n({ A }^{ ' }\cap { B }^{ ' })=n(U)-n(A\cup B)\)
Ans.300
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