A. Steam engine
B. Typewriter
C. Machine learning
D. Telegraph
Which part of the brain controls thinking?
A. Cerebellum
B. Cerebrum
C. Medulla
D. Brain stem
What is the boiling point of water at sea level?
A. 90°C
B. 95°C
C. 100°C
D. 110°C
Which blood cells fight infections in the body?
A. Red blood cells
B. White blood cells
C. Platelets
D. Plasma
Which layer protects Earth from harmful UV rays?
A. Troposphere
B. Mesosphere
C. Ozone layer
D. Ionosphere
What type of energy is stored in a battery?
A. Heat energy
B. Light energy
C. Chemical energy
D. Sound energy
Which device converts sunlight into electricity?
A. Generator
B. Battery
C. Solar panel
D. Transformer
What is the main function of the human heart?
A. Digestion
B. Pumping blood
C. Breathing
D. Thinking
Which vitamin is produced by sunlight in the body?
A. Vitamin A
B. Vitamin B
C. Vitamin D
D. Vitamin K
Which gas mainly causes global warming?
A. Oxygen
B. Nitrogen
C. Carbon dioxide
D. Hydrogen