1. Which gas do we breathe out the most after inhaling oxygen?
   Answer: Carbon Dioxide.

2. What everyday household item works by reducing surface tension to help remove dirt and grease?
   Answer: Soap/Detergent.

3. Why does ice float on water instead of sinking?
   Answer: b) It has lower density than liquid water.

4. Which part of the human body has the fastest-growing cells?
   Answer: b) Hair Follicles.

5. What common kitchen ingredient can be used to neutralize odours and clean surfaces due to its mild alkalinity?
   Answer: Baking Soda.

6. Why does metal feel colder to the touch than wood, even when both are at the same temperature?
   Answer: Metal conducts heat away from your skin faster than wood.

7. What causes the "pop" sound when you crack your knuckles?
   Answer: Gas bubbles collapsing in the fluid inside the joint.

8. Which common food item contains the chemical capsaicin, which gives it a spicy taste?
   Answer: Chili Peppers.

9. What simple machine is used in door handles, bicycle gears, and wrenches to make tasks easier?
   Answer: A Lever.

10. Which part of the eye controls how much light enters by adjusting the size of the pupil?
    Answer: The Iris.

Bright Source Bonus Question

Q. Which three colours of LEDs are combined to create white LED light, revolutionising energy-efficient lighting?
Answer: Red, Green, and Blue (RGB) LEDs or Blue LEDs with a phosphor coating to produce white light.