BPP Science 2 — Questions and Answers
Question 1: What is the process by which water changes from liquid to gas?
- Condensation
- Evaporation (Correct answer)
- Freezing
- Sublimation
Correct answer: Evaporation
Evaporation is the process where liquid water absorbs heat energy and transforms into water vapor at the surface.
Question 2: Which part of the plant conducts photosynthesis primarily?
- Root
- Stem
- Leaf (Correct answer)
- Flower
Correct answer: Leaf
Leaves contain chlorophyll and are the primary site of photosynthesis, capturing sunlight to produce food for the plant.
Question 3: What type of energy is stored in food?
- Kinetic energy
- Chemical energy (Correct answer)
- Thermal energy
- Nuclear energy
Correct answer: Chemical energy
Food stores chemical energy in the bonds of molecules such as carbohydrates and fats, which the body releases through digestion and metabolism.
Question 4: What is the speed of light in a vacuum approximately equal to?
- 300,000 km/s (Correct answer)
- 30,000 km/s
- 3,000 km/s
- 300 km/s
Correct answer: 300,000 km/s
Light travels at approximately 300,000 kilometers per second (3 × 10⁸ m/s) in a vacuum.
Question 5: Which element has the chemical symbol 'O'?
- Gold
- Osmium
- Oxygen (Correct answer)
- Oganesson
Correct answer: Oxygen
Oxygen, the element essential for breathing and combustion, is represented by the symbol 'O' on the periodic table.
Question 6: What is the main function of the lungs?
- Pumping blood
- Filtering toxins
- Gas exchange (Correct answer)
- Digesting food
Correct answer: Gas exchange
The lungs perform gas exchange, taking in oxygen from the air and releasing carbon dioxide produced by the body's cells.
BPP Science 2
What is the process by which water changes from liquid to gas?