Question : Which mirror is used by doctors for examining eyes, ears, nose, and throat?

Option 1: Concave mirror

Option 2: Convex mirror

Option 3: Normal mirror

Option 4: Plane mirror

Question : The type of mirror used in automobiles to see the traffic on the rear side is

Option 1: concave

Option 2: plano-Convex

Option 3: plane

Option 4: convex

Question : A person suffering from long-sightedness wears spectacles having:

Option 1: concave-convex lens

Option 2: lenses with negative

Option 3: concave lenses

Option 4: convex lenses

Question : The type of mirrors used in the headlamp of cars is:

Option 1: parabolic concave

Option 2: plane

Option 3: spherical convex

Option 4: cylindrical concave

Question : If A : B = 3 : 4 and B : C = 1 : 5, then what is A : C?

Option 1: 3 : 20

Option 2: 3 : 4

Option 3: 1 : 4

Option 4: 3 : 5