Science
20 Questions
20:00

1. Which gas is filled in balloons?

Oxygen
Nitrogen
Helium
Carbon dioxide

2. Which gas is released during respiration?

Oxygen
Nitrogen
Carbon dioxide
Hydrogen

3. Which organ helps us to hear?

Eyes
Nose
Ears
Tongue

4. Speed of light is?

3×10⁸ m/s
3×10⁶ m/s
300 m/s
30 m/s

5. Which organ removes waste from blood?

Heart
Lungs
Kidneys
Brain

6. Which blood cells fight diseases?

Red blood cells
White blood cells
Platelets
Plasma

7. What is the freezing point of water?

0°C
10°C
50°C
100°C

8. Which substance dissolves salt easily?

Oil
Water
Sand
Stone

9. Which part of the plant carries water?

Root
Stem
Leaf
Flower

10. Which organ helps us to breathe?

Heart
Brain
Lungs
Liver

11. What is the boiling point of water?

50°C
100°C
150°C
200°C

12. Which organ helps in digestion?

Heart
Stomach
Lungs
Brain

13. Which part of the body controls all activities?

Heart
Brain
Lungs
Kidney

14. What causes day and night?

Earth rotation
Earth revolution
Moon rotation
Sun movement

15. Which gas do plants absorb for photosynthesis?

Oxygen
Carbon dioxide
Nitrogen
Hydrogen

16. Which gas is used in fire extinguishers?

Oxygen
Carbon dioxide
Nitrogen
Helium

17. Which planet is closest to the Sun?

Earth
Mars
Mercury
Venus

18. Which planet is known as the Red Planet?

Earth
Venus
Mars
Jupiter

19. Which organ helps fish to breathe?

Lungs
Skin
Gills
Fins

20. Which gas is known as laughing gas?

Oxygen
Nitrous oxide
Carbon dioxide
Hydrogen