#### 11th Standard Maths English Medium Free Online Test One Mark Questions with Answer Key 2020 - Part Nine

11th Standard

Reg.No. :
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Maths

Time : 00:10:00 Hrs
Total Marks : 10

10 x 1 = 10
1. LetA= {-2, -1, 0, 1, 2} andf: A ⟶ Z be given by f(x) =x2-2x-3 then preimage of 5 is

(a)

-2

(b)

-1

(c)

0

(d)

1

2. If a and b are the roots of the equation x2-kx+c = 0 then the distance between the points (a, 0) and (b, 0)

(a)

$\sqrt { { 4k }^{ 2 }-c }$

(b)

$\sqrt { { k }^{ 2 }-4c }$

(c)

$\sqrt { 4c-{ k }^{ 2 } }$

(d)

$\sqrt { k-8c }$

3. Zero of the polynomial p(x) = x2 - 4x + 4

(a)

1

(b)

2

(c)

-2

(d)

-1

4. In a triangle ABC, sin2A+sin2B+sin2C=2, then the triangle is

(a)

equilateral triangle

(b)

isosceles triangle

(c)

right triangle

(d)

scalene triangle

5. There are 10 points in a plane and 4 of them are collinear. The number of straight lines joining any two points is

(a)

45

(b)

40

(c)

39

(d)

38

6. Find the angle between the lines 3x2,- 10xy - 3y2 = 0

(a)

90°

(b)

45°

(c)

60°

(d)

30°

7. The value $\lambda$ for which the equation 12x2-10xy+2y2+11x-5y+$\lambda$ =0 represent a pair of straight lines is

(a)

$\lambda$=1

(b)

$\lambda$=2

(c)

$\lambda$=3

(d)

$\lambda$=0

8. |adj A| =_____________ where A is a square matrix of order

(a)

|A|

(b)

|A|2

(c)

|A|3

(d)

I

9. The vector in the direction of the vector$\hat{i}-2\hat{j}+2\hat{k}$ that has magnitude 9 is

(a)

$\hat{i}-2\hat{j}+2\hat{k}$

(b)

$\frac { \hat { i } -2\hat { j } +2\hat { k } }{ 3 }$

(c)

3($\hat{i}-2\hat{j}+2\hat{k}$)

(d)

9($\hat{i}-2\hat{j}+2\hat{k}$)

10. Find the odd one out of the following

(a)

|x|

(b)

sin x

(c)

cos x

(d)

$\frac{1}{x}$