Which gas is essential for photosynthesis besides sunlight?
A. Oxygen
B. Nitrogen
C. Carbon dioxide
D. Hydrogen
Which metal is liquid at room temperature?
A. Iron
B. Mercury
C. Aluminum
D. Copper
The human body’s largest bone is:
A. Femur
B. Tibia
C. Humerus
D. Femur
Which organ removes waste from blood?
A. Heart
B. Lungs
C. Kidneys
D. Liver
The planet closest to the Sun is:
A. Venus
B. Earth
C. Mercury
D. Mars
Which simple machine is a ramp?
A. Lever
B. Pulley
C. Inclined plane
D. Wheel
Which part of the eye controls the amount of light entering it?
A. Lens
B. Retina
C. Iris
D. Cornea
The unit of electric current is:
A. Volt
B. Ohm
C. Ampere
D. Watt
Which phenomenon splits white light into colors?
A. Reflection
B. Refraction
C. Dispersion
D. Diffusion
Which planet is known for its rings?
A. Jupiter
B. Mercury
C. Saturn
D. Venus