biology
what is the largest organ in the human body?
a) Heart
b) Brain
c) Skin
d) Lungs
c) Skin
What type of bond is formed when two atoms share electrons?
a)Ionic bond
b)Covalent bond
c)Metallic bond
d)Hydrogen bond
b)Covalent bond
What is the force that pulls objects toward the Earth?
Gravity
what is the symbol for the element Oxygen?
O
which part of the plant is responsible for making food?
a) Roots
b) Leaves
c) Stem
d) Flowers
b) Leaves
What is the process by which a solid turns into a liquid?
a)Freezing
b)Melting
c)Boiling
d)Condensation
b)Melting
What is the unit of measurement for force?
Newton
What is the name of the gas that plants produce during photosynthesis?
Oxygen
what is the process by which animals break down food to get energy?
a) Photosynthesis
b) Respiration
c) Digestion
d) Germination
c) Digestion
What is the atomic number of Carbon?
a)6
b)8c)12
d)14
a)6
Which of the following is an example of potential energy?
a)A moving car
b)A stretched rubber band
c)A light bulb glowingd)A rolling ball
b)A stretched rubber band
what is the pH level of pure water?
7
What is the name of the pigment in plants that makes them green?
a) Chlorophyll
b) Carotene
c) Melanin
d) Hemoglobin
a) Chlorophyll
What is formed when an acid reacts with a base?
a)Salt and water
b)Water and gas
c)Oxygen and water
d)Hydrogen and salt
a)Salt and water
What do we call the force that opposes motion between two surfaces?
Friction
what type of bond is formed when two atoms share electrons?
Covalent bond
which of the following is responsible for carrying oxygen in the blood?
a) Red blood cells
b) White blood cells
c) Platelets
d) Plasma
a) Red blood cells
Which of the following is a characteristic of noble gases?
a)They are highly reactive
b)They are colorless and odorless
c)They form bonds easily with other elements.
d)They are only found in liquid form
b)they are colorless and odorless
What is the law of conservation of energy?
Energy cannot be created or destroyed,only converted from one form to another
which of the following elements is noble gas?
a) Nitrogen
b) Helium
c) Oxygen
d) Hydrogen
b) Helium