Bisphenol A (BPA), a cause of concern, is a structural/key component in the manufacture of which of the following kinds of plastics?

Find the value of x if 8 $(x)^\frac{1}{2}$ = $\sqrt6889$ + $\sqrt4761$ 

Which of the following is NOT an example of a colloidal solution?

A ball is released from rest at the top of an inclined smooth plane of length 5 cm. After reaching the bottom it travels horizontally on a smooth surface. How much distance will it travel horizontally? (Neglect the frictional forces as both the plane and surface are smooth)

What happens to the gravitational force between two objects, if the distance between them is doubled and everything else remains the same?

Which of the following statements are correct in relation to the extraction of metals? The metals which lie high in the reactivity series are extracted by the electrolysis of molten ore. 

The metals of medium reactivity series exist as sulphides and carbonates in nature. It is easier to extract a metal from its sulphide in comparison to oxides.

Which of the following statements is/are true about the loudness and softness of a sound wave?

 (i) A loud sound has less amplitude as compared to a soft sound.

 (ii) A loud sound has more energy associated with it as compared to a soft sound. 

(iii) The loudness of a sound wave is the measure of the response of the ear to the sound.

Which of the following symbols represents a rheostat?

Successive discounts of 9% and 6% are equivalent to a single discount of:

In a cyclic quadrilateral ABCD, the sides are AB = 10 cm, BC = 14 cm, CD = 8 cm, and DA = 12 cm. Find the area of the quadrilateral.