Practice Test GeeksSSC Practice Test
← All SSC Flashcard Decks

General Science Flashcards

7 cards from real SSC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 General Science flashcards as text

  1. The pH of pure water at 25°C is:

    Answer: 7

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

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

    Answer: Retina

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

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

    Answer: Convex mirror

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

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

    Answer: Oxidation

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

  5. Which blood group is considered the 'universal donor'?

    Answer: O-

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

  6. The unit used to measure the frequency of sound waves is:

    Answer: Hertz

    Hertz (Hz) is the SI unit of frequency, defined as one cycle per second, and is used to measure sound wave frequency.

  7. Which vitamin is produced by the human skin when exposed to sunlight?

    Answer: Vitamin D

    Vitamin D is synthesized in the skin when ultraviolet B (UVB) radiation from sunlight converts 7-dehydrocholesterol to Vitamin D₃.