Q3. Three solid metallic spheres whose radii are in the ratio 3 : 4 : 5 are melted and re-casted into a bigger metallic solid sphere. If the surface area of the new sphere is 2304π cm². Find the radius of smallest sphere ?
(a) 24 cm
(b) 12 cm
(c) 14 cm
(d) 4 cm
Q4. AB and CD are the parallel sides of a trapezium ABCD with AB = 12 cm & AD = . Also ∠D = 30° & ∠C = 60°. Find the sum of squares of diagonals.
Q5. Given EC is diameter of the circle and is parallel to BD. If ∠A = 50°, then find ∠CBD =?
Q8. If zeroes of the polynomial f(x) = k²x² – 17x + k + 2, (k > 0) are reciprocal to each other, then value of ‘k’ is
Q9. Find x, y, z such that x + yz = 2, y + xz = 2 & z + xy = 2.
(a) (1, 1, 1)
(b) (-2, -2, -2)
(c) options a & b both
(d) neither option a nor b.
Q10. An ant sitting at one corner of a cuboid shaped room of length 9 mtr, breadth 8 mtr & height 6 mtr. Then find the shortest length (Approx length in m) of the path, which it should follow to reach the diagonally opposite corner of the room.