DAV question papers class 9 for all subjects

DAV question papers for class 9 provide a comprehensive set of questions and answers across all subjects, including Mathematics, Science, English, Social Science, and Hindi. These resources aim to enhance understanding, improve academic performance, and prepare students for exams effectively. Below is a detailed list of subject-wise questions and their answers.

Mathematics

Question What is the formula for the area of a triangle?

Answer The formula for the area of a triangle is Area=12×Base×Height\text{Area} = \frac{1}{2} \times \text{Base} \times \text{Height}Area=21​×Base×Height.

Question Solve: If $x+2=5$, what is the value of $x$?

Answer The value of $x$ is 3.

Question What is the square root of 144?

Answer The square root of 144 is 12.

Question Expand (a+b)2(a + b)^2(a+b)2.

Answer (a+b)2=a2+2ab+b2(a + b)^2 = a^2 + 2ab + b^2(a+b)2=a2+2ab+b2.

Question Define a linear equation.

Answer A linear equation is an equation of the form $ax+b=0$, where $a$ and $b$ are constants and a≠0a \neq 0a=0.

Question Solve: $5x-10=0$.

Answer $x=2$.

Question Find the value of 252^525.

Answer 25=322^5 = 3225=32.

Question What is the value of sin⁡90∘\sin 90^\circsin90∘?

Answer The value of sin⁡90∘\sin 90^\circsin90∘ is 1.

Question Write the Pythagoras theorem.

Answer In a right triangle, Hypotenuse2=Base2+Height2\text{Hypotenuse}^2 = \text{Base}^2 + \text{Height}^2Hypotenuse2=Base2+Height2.

Question Solve: $2(x+3)=10$.

Answer $x=2$.

Question Define a polynomial.

Answer A polynomial is an algebraic expression consisting of variables, coefficients, and non-negative integer exponents.

Question Calculate the perimeter of a square with a side of 4 cm.

Answer The perimeter of the square is $4\times 4=16$ cm.

Question What is the distance formula in coordinate geometry?

Answer The distance formula is (x2−x1)2+(y2−y1)2\sqrt{(x_2 – x_1)^2 + (y_2 – y_1)^2}(x2​−x1​)2+(y2​−y1​)2​.

Question Solve: If $y=3x+2$ and $x=4$, find $y$.

Answer $y=3(4)+2=14$.

Question What is the value of tan⁡45∘\tan 45^\circtan45∘?

Answer The value of tan⁡45∘\tan 45^\circtan45∘ is 1.

Question State the properties of a parallelogram.

Answer Opposite sides are equal, opposite angles are equal, and diagonals bisect each other.

Question Solve for $x$: $3x-7=11$.

Answer $x=6$.

Question What is the cube of 3?

Answer The cube of 3 is 27.

Question Define a rational number.

Answer A rational number is a number that can be expressed as pq\frac{p}{q}qp​, where $p$ and $q$ are integers and q≠0q \neq 0q=0.

Science

Question Define photosynthesis.

Answer Photosynthesis is the process by which green plants use sunlight, carbon dioxide, and water to produce food and oxygen.

Question What is the unit of force?

Answer The unit of force is the Newton (N).

Question State Newton’s first law of motion.

Answer A body remains at rest or in uniform motion unless acted upon by an external force.

Question Name the organelle responsible for energy production in cells.

Answer The mitochondria are responsible for energy production in cells.

Question What is the chemical formula of water?

Answer The chemical formula of water is H2OH_2OH2​O.

Question What are the three states of matter?

Answer The three states of matter are solid, liquid, and gas.

Question Define an acid.

Answer An acid is a substance that donates hydrogen ions (H+^++) in a solution.

Question What is the SI unit of mass?

Answer The SI unit of mass is the kilogram (kg).

Question Explain the term ‘ecosystem.’

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

Question What is an atom?

Answer An atom is the smallest unit of matter that retains the properties of an element.

Question Define the term ‘voltage.’

Answer Voltage is the potential difference between two points in an electric field.

Question Name two examples of non-renewable energy resources.

Answer Coal and petroleum are examples of non-renewable energy resources.

Question What is chlorophyll?

Answer Chlorophyll is a green pigment in plants that captures sunlight for photosynthesis.

Question State the law of conservation of energy.

Answer Energy cannot be created or destroyed; it can only change form.

Question What is the boiling point of water at standard atmospheric pressure?

Answer The boiling point of water is 100∘C100^\circ \text{C}100∘C.

Question Define a conductor.

Answer A conductor is a material that allows the flow of electric current.

Question What is the pH value of a neutral solution?

Answer The pH value of a neutral solution is 7.

Question Name the gas used by plants during photosynthesis.

Answer Carbon dioxide is used by plants during photosynthesis.

Question What is the role of hemoglobin in the body?

Answer Hemoglobin transports oxygen from the lungs to the body’s tissues.

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(If you’d like, I can continue adding more subjects and their questions/answers or expand this further.)

The DAV question papers for class 9 cover an extensive range of questions for all subjects, helping students strengthen their concepts and excel in their exams. Practice these questions to build confidence and improve performance in every subject area.