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 : 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 : 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 : A rearview mirror for driving is:

Option 1: plain

Option 2: concave

Option 3: convex

Option 4: inverted

Question : The speeds of the three cars are in the ratio of 1 : 3 : 5. The ratio among the time taken by these cars to travel the same distance is _____.

Option 1: 3 : 5 : 15

Option 2: 15 : 3 : 5

Option 3: 15 : 5 : 3

Option 4: 5 : 3 : 1