A transparent material is bounded by two surfaces of which one (or) both – surfaces are spherical is called

Correct Answer - `(x= 3, y = 4); A(3, 4 ), B(0, 2 ), C (0, 7) ; ar(Delta ABC) = 7` sq units.

Correct option is  C) 2 × 108

B) bi concave lens

Correct option is  B) – 40 cm

Correct option is  B) a prism

D) The angle between the incident ray and refracted ray is called angle of deviation.

B) both are concave

B) frictional force

Correct option is  B) Cube

Correct Answer - A Ammonia, as it is readily soluble, is generally excreted by diffusion across body surfaces or through gill surfaces (in fish) as ammonium ions. Kidneys do not play...