SSC General Science 2

Question 1

The pH of pure water at 25°C is:

Accepted Answer

7

Answer

Pure water is neutral with a pH of exactly 7, meaning equal concentrations of H⁺ and OH⁻ ions.

Question 2

Which part of the human eye contains the photoreceptors (rods and cones)?

Accepted Answer

Retina

Answer

The retina is the light-sensitive layer at the back of the eye containing rods (for dim light) and cones (for color vision).

Question 3

What type of mirror is used in the rear-view mirrors of vehicles?

Accepted Answer

Convex mirror

Answer

Convex mirrors provide a wider field of view and always form virtual, erect, and diminished images, making them ideal for rear-view mirrors.

Question 4

Rusting of iron is an example of which type of chemical reaction?

Accepted Answer

Oxidation

Answer

Rusting involves iron reacting with oxygen and moisture to form iron oxide (Fe₂O₃), which is an oxidation reaction.

Question 5

Which blood group is considered the 'universal donor'?

Accepted Answer

O-

Answer

O- (O negative) is the universal donor because it lacks A, B, and Rh antigens, making it compatible with all blood types.

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