ISSB - Pak Navy Officer Selection General Knowledge Science — Set 3

ISSB - Pak Navy Officer Selection General Knowledge Science — Set 3

1. Question 1

   Q1. Which gas is used by plants in photosynthesis?

   • A) Oxygen
   • B) Carbon dioxide
   • C) Nitrogen
   • D) Hydrogen

   Answer: Carbon dioxide

   Explanation: Plants absorb carbon dioxide during photosynthesis. This fact often appears in ISSB academic and general knowledge sections.

2. Question 2

   Q2. The chemical symbol for sodium is:

   • A) S
   • B) Na
   • C) So
   • D) Sd

   Answer: Na

   Explanation: Sodium has the symbol Na from the Latin natrium. This fact often appears in ISSB academic and general knowledge sections.

3. Question 3

   Q3. The speed of light is about:

   • A) 300,000 km/s
   • B) 300 km/s
   • C) 3,000 km/s
   • D) 30,000 km/s

   Answer: 300,000 km/s

   Explanation: Light travels about 300,000 km per second in vacuum. This fact often appears in ISSB academic and general knowledge sections.

4. Question 4

   Q4. The human adult skeleton has about:

   • A) 106 bones
   • B) 206 bones
   • C) 306 bones
   • D) 406 bones

   Answer: 206 bones

   Explanation: An adult human has about 206 bones. This fact often appears in ISSB academic and general knowledge sections.

5. Question 5

   Q5. SI unit of energy is:

   • A) Newton
   • B) Joule
   • C) Watt
   • D) Pascal

   Answer: Joule

   Explanation: Energy is measured in joules in the SI system. This fact often appears in ISSB academic and general knowledge sections.

6. Question 6

   Q6. The chemical symbol for iron is:

   • A) Ir
   • B) Fe
   • C) In
   • D) I

   Answer: Fe

   Explanation: Iron has the symbol Fe from the Latin ferrum. This fact often appears in ISSB academic and general knowledge sections.

7. Question 7

   Q7. The process by which plants make food is:

   • A) Respiration
   • B) Photosynthesis
   • C) Digestion
   • D) Fermentation

   Answer: Photosynthesis

   Explanation: Photosynthesis is how plants make food using light. This fact often appears in ISSB academic and general knowledge sections.

8. Question 8

   Q8. The boiling point of water at sea level is:

   • A) 90°C
   • B) 100°C
   • C) 110°C
   • D) 120°C

   Answer: 100°C

   Explanation: Water boils at 100 degrees Celsius at standard pressure. This fact often appears in ISSB academic and general knowledge sections.

9. Question 9

   Q9. The human heart has how many chambers?

   • A) 2
   • B) 3
   • C) 4
   • D) 5

   Answer: 4

   Explanation: The human heart has four chambers. This fact often appears in ISSB academic and general knowledge sections.

10. Question 10

    Q10. The chemical formula of carbon dioxide is:

    • A) CO
    • B) CO2
    • C) C2O
    • D) O2

    Answer: CO2

    Explanation: Carbon dioxide is CO2. This option matches the rule tested here. Work each step carefully; ISSB math rewards accuracy under time pressure.

11. Question 11

    Q11. Vitamin D is mainly produced by:

    • A) Darkness
    • B) Sunlight on skin
    • C) Only food always
    • D) Only water

    Answer: Sunlight on skin

    Explanation: Sunlight helps the skin produce vitamin D. This fact often appears in ISSB academic and general knowledge sections.

12. Question 12

    Q12. Adult human bones number about:

    • A) 106
    • B) 206
    • C) 306
    • D) 406

    Answer: 206

    Explanation: An adult human skeleton has about 206 bones. This fact often appears in ISSB academic and general knowledge sections.

13. Question 13

    Q13. Speed of light in vacuum is approximately?

    • A) 3×10⁸ m/s
    • B) 3×10⁶ m/s
    • C) 3×10¹⁰ m/s
    • D) 3×10⁴ m/s

    Answer: 3×10⁸ m/s

    Explanation: Light travels about three hundred million meters per second in vacuum. Work each step carefully; ISSB math rewards accuracy under time pressure.

14. Question 14

    Q14. Human body normal temperature is about?

    • A) 96°F
    • B) 98.6°F
    • C) 100°F
    • D) 102°F

    Answer: 98.6°F

    Explanation: Normal body temperature is approximately 98.6 degrees Fahrenheit. This fact often appears in ISSB academic and general knowledge sections.

15. Question 15

    Q15. Gas essential for respiration?

    • A) Nitrogen
    • B) Oxygen
    • C) Carbon dioxide
    • D) Hydrogen

    Answer: Oxygen

    Explanation: Humans breathe in oxygen for cellular respiration. This fact often appears in ISSB academic and general knowledge sections.

16. Question 16

    Q16. Planet closest to the Sun?

    • A) Venus
    • B) Mercury
    • C) Earth
    • D) Mars

    Answer: Mercury

    Explanation: Mercury is the innermost planet in our solar system. This fact often appears in ISSB academic and general knowledge sections.

17. Question 17

    Q17. Vitamin from sunlight on skin?

    • A) Vitamin A
    • B) Vitamin C
    • C) Vitamin D
    • D) Vitamin K

    Answer: Vitamin D

    Explanation: Skin produces vitamin D when exposed to sunlight. This fact often appears in ISSB academic and general knowledge sections.

18. Question 18

    Q18. Boiling point of water at sea level?

    • A) 90°C
    • B) 100°C
    • C) 110°C
    • D) 120°C

    Answer: 100°C

    Explanation: Water boils at 100 degrees Celsius at standard pressure. This fact often appears in ISSB academic and general knowledge sections.

19. Question 19

    Q19. Blood cells that fight infection?

    • A) Red blood cells
    • B) White blood cells
    • C) Platelets
    • D) Plasma only

    Answer: White blood cells

    Explanation: White blood cells are part of the immune defense. This fact often appears in ISSB academic and general knowledge sections.

20. Question 20

    Q20. SI unit of force?

    • A) Joule
    • B) Newton
    • C) Watt
    • D) Pascal

    Answer: Newton

    Explanation: Force is measured in newtons in the SI system. This fact often appears in ISSB academic and general knowledge sections.