Download US MC 9th Question Paper and Answer

The US MC 9th-grade question papers cover various subjects that help students develop a strong academic foundation. Here, questions and answers from all subjects, including math, science, social studies, and English, will be provided.

Mathematics Questions and Answers

Question: What is the solution to the equation $2x+5=15$?

Answer: The solution is $x=5$.

Question: Simplify the expression $3a-2a+4$.

Answer: The simplified expression is $a+4$.

Question: What is the area of a rectangle with length 6 units and width 4 units?

Answer: The area of the rectangle is 24 square units.

Question: What is the value of $x$ if $x/3=7$?

Answer: The value of $x=21$.

Question: Find the greatest common divisor (GCD) of 36 and 48.

Answer: The GCD of 36 and 48 is 12.

Question: Solve the inequality $2x-3<7$.

Answer: The solution is $x<5$.

Question: If a triangle has a base of 8 cm and a height of 5 cm, what is its area?

Answer: The area of the triangle is 20 square cm.

Question: What is the square root of 144?

Answer: The square root of 144 is 12.

Question: Expand the expression $(x+3)(x-2)$.

Answer: The expanded form is x2+x−6x^2 + x – 6x2+x−6.

Question: What is the circumference of a circle with a radius of 7 units?

Answer: The circumference is approximately 43.96 units.

Question: Solve for $y$ in the equation $5y-10=20$.

Answer: The solution is $y=6$.

Question: Find the least common multiple (LCM) of 5 and 7.

Answer: The LCM of 5 and 7 is 35.

Question: Convert 0.75 into a fraction.

Answer: The fraction form is $3/4$.

Question: What is the volume of a cube with side length 3 units?

Answer: The volume is 27 cubic units.

Question: Solve for $x$ if $3x=18$.

Answer: The solution is $x=6$.

Question: What is the sum of the angles in a triangle?

Answer: The sum of the angles in a triangle is 180 degrees.

Question: Simplify the expression $4x-2x+7$.

Answer: The simplified expression is $2x+7$.

Question: What is the perimeter of a square with a side length of 5 units?

Answer: The perimeter is 20 units.

Question: Find the value of $x$ in the equation $2x+7=19$.

Answer: The value of $x=6$.

Question: Solve the equation x2=49x^2 = 49x2=49.

Answer: The solution is $x=7$ or $x=-7$.

Science Questions and Answers

Question: What is the chemical formula for water?

Answer: The chemical formula for water is H2OH_2OH2​O.

Question: Define photosynthesis.

Answer: Photosynthesis is the process by which plants convert sunlight into chemical energy.

Question: What is the powerhouse of the cell?

Answer: The powerhouse of the cell is the mitochondrion.

Question: What is the atomic number of carbon?

Answer: The atomic number of carbon is 6.

Question: What is the law of conservation of mass?

Answer: The law states that mass cannot be created or destroyed in a chemical reaction.

Question: What is the boiling point of water at sea level?

Answer: The boiling point of water at sea level is 100°C.

Question: Name the planets in the solar system in order from the Sun.

Answer: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.

Question: What is Newton’s first law of motion?

Answer: An object at rest stays at rest, and an object in motion stays in motion unless acted upon by an external force.

Question: Define evaporation.

Answer: Evaporation is the process by which liquid water turns into vapor.

Question: What is the main function of red blood cells?

Answer: The main function of red blood cells is to carry oxygen throughout the body.

Question: What is the formula for calculating speed?

Answer: The formula for speed is Speed=DistanceTime\text{Speed} = \frac{\text{Distance}}{\text{Time}}Speed=TimeDistance​.

Question: What is an ecosystem?

Answer: An ecosystem is a community of living organisms interacting with their environment.

Question: What is the primary gas found in the Earth’s atmosphere?

Answer: The primary gas in the Earth’s atmosphere is nitrogen.

Question: What is a food chain?

Answer: A food chain is a sequence of organisms that consume each other for energy.

Question: What is the function of the digestive system?

Answer: The digestive system breaks down food into nutrients that the body can absorb.

Question: What is the pH scale used for?

Answer: The pH scale measures how acidic or basic a substance is.

Question: What is gravity?

Answer: Gravity is the force that pulls objects toward the center of the Earth.

Question: Define biodiversity.

Answer: Biodiversity is the variety of life in a particular habitat or ecosystem.

Question: What is a gene?

Answer: A gene is a unit of heredity that determines specific traits in organisms.

Question: What is the speed of light?

Answer: The speed of light is approximately $299,792$ kilometers per second.

Social Studies Questions and Answers

Question: Who was the first president of the United States?

Answer: The first president of the United States was George Washington.

Question: What are the three branches of the U.S. government?

Answer: The three branches are the executive, legislative, and judicial branches.

Question: What is the capital of the United States?

Answer: The capital of the United States is Washington, D.C.

Question: Define democracy.

Answer: Democracy is a system of government where power is vested in the people.

Question: What was the main cause of the American Civil War?

Answer: The main cause was the conflict over slavery.

Question: What is the supreme law of the land in the United States?

Answer: The supreme law of the land is the U.S. Constitution.

Question: What is the Bill of Rights?

Answer: The Bill of Rights is the first ten amendments to the U.S. Constitution.

Question: Who wrote the Declaration of Independence?

Answer: Thomas Jefferson wrote the Declaration of Independence.

Question: What is the purpose of the United Nations?

Answer: The purpose is to promote international peace and security.

Question: What is the largest country by land area?

Answer: The largest country by land area is Russia.

Question: What is capitalism?

Answer: Capitalism is an economic system based on private ownership and free markets.

Question: What is the purpose of the judicial branch?

Answer: The purpose is to interpret and apply the law.

Question: What is the main function of Congress?

Answer: The main function of Congress is to make laws.

Question: Who was Martin Luther King Jr.?

Answer: Martin Luther King Jr. was a civil rights leader who fought for racial equality.

Question: What is the significance of the Emancipation Proclamation?

Answer: It declared the freedom of slaves in Confederate states.

Question: What was the Cold War?

Answer: The Cold War was a period of political tension between the United States and the Soviet Union.

Question: What is globalization?

Answer: Globalization is the process of increased interconnectedness among countries.

Question: What is the role of the president of the United States?

Answer: The president serves as the head of state and government.

Question: What are human rights?

Answer: Human rights are fundamental rights and freedoms to which all people are entitled.

Question: What was the purpose of the Monroe Doctrine?

Answer: The purpose was to prevent European intervention in the Americas.

English Questions and Answers

Question: What is the synonym of “happy”?

Answer: A synonym for “happy” is “joyful.”

Question: What is an adjective?

Answer: An adjective is a word that describes a noun.

Question: What is a simile?

Answer: A simile is a figure of speech that compares two things using “like” or “as.”

Question: What is the subject of a sentence?

Answer: The subject is the part of the sentence that tells who or what the sentence is about.

Question: Define verb.

Answer: A verb is a word that expresses an action or state of being.

Question: What is an antonym?

Answer: An antonym is a word that has the opposite meaning of another word.

Question: What is a metaphor?

Answer: A metaphor is a figure of speech that refers to one thing by mentioning another.

Question: What is the past tense of “go”?

Answer: The past tense of “go” is “went.”

Question: Define noun.

Answer: A noun is a word that represents a person, place, thing, or idea.

Question: What is the plural form of “child”?

Answer: The plural form is “children.”

Question: What is a preposition?

Answer: A preposition is a word that shows the relationship between a noun and another word.

Question: What is an idiom?

Answer: An idiom is a phrase that has a meaning different from the literal meanings of its words.

Question: What is the future tense of “write”?

Answer: The future tense is “will write.”

Question: What is a pronoun?

Answer: A pronoun is a word that takes the place of a noun.

Question: Define conjunction.

Answer: A conjunction is a word that connects words or groups of words.

Question: What is a synonym for “big”?

Answer: A synonym for “big” is “large.”

Question: What is the antonym of “dark”?

Answer: The antonym is “light.”

Question: What is the main idea of a passage?

Answer: The main idea is the central point or message of a passage.

Question: What is a conjunction used for?

Answer: A conjunction connects words or phrases in a sentence.

Question: Define article.

Answer: An article is a word used before a noun to specify whether the noun is definite or indefinite.