CBSE 11TH MATHEMATICS - Online Test
Q1. then a, b, c, d are in
Answer : Option D
Explaination / Solution:
Q2. The S.D. of the first n natural numbers is
Answer : Option A
Explaination / Solution:
first n natural numbers are 1,2,3.....n
we know that,
sum of sqaure is
Q3.
The line which is parallel to X axis and crosses the curve y = at an angle of is:
Answer : Option B
Explaination / Solution:
The equation of the line which is a tangent to the curve y = is
y = mx + a/m
Since it makes and angle of 450, m = 1
y2 = x implies a = 1/4
Hence the equation of the tangent is y = x+
That is the y intercept is = 1/2
Hence the equation of the line is y = 1/2
Q4. Let p be the proposition : Mathematics is interesting and let q be the proposition that Mathematics is difficult, then the symbol p∧q means
Answer : Option A
Explaination / Solution:
using connective and for ∧
Q5. The vertex of the parabola is
Answer : Option D
Explaination / Solution:
Let Y=y and X = x-a
for standard parbola Y2=4aX the vertex is (0,0)
so put X=0 and Y=0.
i.e. put x-a = 0 and y=0
so vertex is (a,0)
Q6.
In a triangle ABC, the line joining the circumcentre and the incentre is parallel to BC, then cos B + cos C =
Answer : Option B
Explaination / Solution:
No Explaination.
Q7. If n N then is divisible by
Answer : Option B
Explaination / Solution:
When n = 1 the value is 3 and when n = 2 the value is 12. So the value of the expression when n = 1,2,3.... are multiples of 3 . hence it is divisible by 3.
Q8. The probability that a teacher will give an unannounced test during any class is. If a student is absent twice, then the probability that he misses atleast one test is
Answer : Option B
Explaination / Solution:
No Explaination.
Q9. The plane XOZ divides the join of ( 1 , -1 , 5 ) and ( 2 , 3 ,4 ) in the ratio k : 1 , then the value of k is
Answer : Option B
Explaination / Solution:
No Explaination.
Q10. Find r if
Answer : Option D
Explaination / Solution:
