Question

✨8 points✨

Solve the following MCQS and One mark questions :-

1. If the two roots of 2x^2 + ax + 18 = 0 are equal, then the value of a is-?
(a) +-4 (b) +-8 (c) +-6 (d) +-12

2. In right triangle ABC <A =90° and AD perpendicular to BC. Then BC/DC =?
(a) (AB/AC) ^2 (b) AB/AC (c)(AB/AD) ^2 (d)AB/AD

3. If the roots of the quadratic equation x^2 + 4x + K = 0 are equal, then the value of k is -?
(a) - 4 (b) 1/4 (c) 4 (d) 1

4. If the size of the shadow of an object is minimum then angle of elevation of the sun is -?
(a) 0° (b) 30° (c) 60° (d) 90°

5. Point of intersection of less than ogive and more than ogives of a group data is (27, 12). Total frequency of data is -?
(a) 12 (b) 42 (c) 24 (d) 27

6. If x bar is the mean of x1, x2, x3,..... Xn, then the median of x1 + P, x2 + P...... Xn + P is -?
(a) X bar (b) X bar - P (c) X bar + Pn (d) X bar + P

7. The roots of the quadratic equation ax^2 + bx + c =0 will be equal in magnitude but opposite in sign when b =?
(a) 0 (b) c/a (c) 1 (d) 1/a

8. If the point A(1, 2), B(0,0), C(a, b) are collinear, then -?
(a) a = b (b) a = 2b (c)2a = b (d)a = - b

9. Under what condition the roots of the quadratic equation x^2 - 4x + p = 0 will be real and equal?
(a) p < and equal to - 4
(b) p > and equal to 4
(c) p = 4
(d) p > and equal to - 4

1 mark questions
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1. Under what condition, the roots of the below quadratic equation will be real and equal?
X^2 + pz = q

2. What is scale factor?

Answer 1

scale factor is a number which scales, or multiplies, some quantity. In the equation y = Cx, C is the scale factor for x. C is also the coefficient of x, and may be called the constant of proportionality of y to x.

Answer 2

Hey there Ur answer is in the attachment...
Sorry I got late....