List of top Questions asked in CBSE Class IX

Find the value of the polynomial 5x – 4x ² + 3 at 

(i) x = 0 (ii) x = –1 (iii) x = 2

Expand each of the following, using suitable identities: 

(i) (x + 2y + 4z) 2 (ii) (2x – y + z) ² (iii) (–2x + 3y + 2z) ² 

(iv) (3a – 7b – c) ² (v) (–2x + 5y – 3z) ² (vi) [ \(\frac{1 }{ 4}\) a - \(\frac{1 }{ 2}\) b + 1]²

1. an object with a constant acceleration but with zero velocity 
2. an object moving with an acceleration but with uniform speed. 
3. an object moving in a certain direction with an acceleration in the perpendicular direction.

Write four solutions for each of the following equations: 

(i) 2x + y = 7 

(ii) πx + y = 9 

(iii) x = 4y

Which separation techniques will you apply for the separation of the following?

(a) Sodium chloride from its solution in water
(b) Ammonium chloride from a mixture containing sodium chloride and ammonium chloride
(c) Small pieces of metal in the engine oil of a car
(d) Different pigments from an extract of flower petals
(e) Butter from curd
(f) Oil from water
(g) Tea leaves from tea
(h) Iron pins from sand
(i) Wheat grains from husk
(j) Fine mud particles suspended in water

Given below are some emotions that Kezia felt. Match the emotions in Column A with the items in Column B. 

Simplify each of the following expressions: 

(i) (3 + √3)(2 + √2) 

(ii) (3 + √3)(3 - √3) 

(iii) (√5 + √2 )² 

(iv) (√5 - √2)(√5 + √2)