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 Chapter – 1 MATTER IN OUR SURROUNDINGS[expand title=”Read Moreâž”” swaptitle=”🠔Read Less”]

Instructions:

  1. Read the questions carefully before answering.
  2. Write your answers in the space provided below each question.
  3. Attempt all questions.
  4. Marks will be awarded for correct and concise answers.

Part A: Multiple Choice Questions

  1. Which of the following is not a state of matter? a) Solid b) Liquid c) Gas d) Force

  2. The process of a substance changing directly from a solid to a gas is called: a) Condensation b) Sublimation c) Evaporation d) Melting

  3. Which of the following is a physical change? a) Burning of wood b) Rusting of iron c) Boiling of water d) Cooking an egg

  4. The temperature at which a liquid changes into a gas is called: a) Freezing point b) Boiling point c) Melting point d) Condensation point

  5. Which of the following substances has the highest kinetic energy? a) Ice b) Water c) Steam d) They all have the same kinetic energy

Part B: Short Answer Questions

  1. Define matter and name its three states.

  2. Explain the process of sublimation with an example.

  3. How does increasing the temperature affect the state of matter? Provide an example.

Part C: Diagram-Based Questions

  1. Draw a diagram representing the arrangement of particles in a solid.

  2. Draw a diagram representing the arrangement of particles in a gas.

Part D: Long Answer Question

  1. Describe the importance of the concept of state changes in everyday life. Provide three examples to support your answer.

Bonus Question

  1. What is the difference between evaporation and boiling? Explain with an example.

Marks Distribution:

Part A: 5 x 1 = 5 marks Part B: 3 x 2 = 6 marks Part C: 2 x 2 = 4 marks Part D: 1 x 4 = 4 marks Bonus Question: 1 x 3 = 3 marks

Total Marks: 22

I have created a sample worksheet with different types of questions as per the CBSE pattern. You can customize it further or add more questions as needed. Make sure to include relevant visuals and illustrations to support the learning process. [/expand]

CHAPTER-2 IS MATTER AROUND US PURE?[expand title=”Read Moreâž”” swaptitle=”🠔Read Less”]

Instructions:

  1. All questions are compulsory.

  2. Read the questions carefully before answering.

  3. Write your answers in the spaces provided.

  4. Use appropriate units and formulas wherever required.

  5. Define the following terms: a) Pure substance: b) Mixture:

  6. Differentiate between the following: a) Homogeneous mixture and Heterogeneous mixture. b) Solution and Suspension.

  7. Identify whether the following statements are true or false: a) All compounds are pure substances. b) Air is a mixture. c) A solution is always a homogeneous mixture.

  8. Classify the following substances as pure substances or mixtures: a) Oxygen gas b) Table salt c) Orange juice d) Sugar solution

  9. Explain the difference between physical and chemical changes with two examples of each.

  10. Perform the following activities and write your observations: a) Activity 1: Take a mixture of iron filings and sand. Use a magnet to separate the iron filings from the mixture. Observations:

    • Iron filings are attracted to the magnet and get separated.
    • Sand remains unaffected by the magnet.

    b) Activity 2: Dissolve a spoonful of salt in a glass of water and stir it well. Observations:

    • Salt dissolves completely in water, forming a clear solution.

  11. State whether the following processes are physical or chemical changes: a) Melting of ice b) Burning of a candle c) Rusting of iron

  12. A student obtained a sample of impure water. Explain step-by-step how the student can obtain pure water from the given sample using the process of distillation.

  13. An unknown substance was given to a student to test its purity. The student performed the following tests: a) Heating the substance to observe if it changes its state. b) Adding the substance to water and stirring to see if it dissolves. c) Passing an electric current through the substance. The results of the tests are as follows: a) The substance melts at 85°C. b) The substance dissolves completely in water. c) The substance does not conduct electricity. Based on these results, conclude whether the substance is pure or impure.

  14. Bonus Question: List three examples of each of the following: a) Homogeneous mixtures b) Heterogeneous mixtures

Note: This worksheet is designed based on the CBSE pattern for class 9 Science. Answer the questions to the best of your knowledge. [/expand]

CHAPTER-3 ATOMS AND MOLECULES[expand title=”Read Moreâž”” swaptitle=”🠔Read Less”]

Worksheet: Atoms and Molecules

Part A: Multiple Choice Questions (MCQ)

Choose the correct option for each question:

  1. What is the smallest particle of an element that retains its properties? a) Atom b) Molecule c) Compound d) Neutron

  2. The number of protons in the nucleus of an atom is called: a) Mass number b) Atomic number c) Electronegativity d) Atomic mass

  3. Which of the following represents a compound? a) H b) Hâ‚‚O c) Nâ‚‚ d) Oâ‚‚

  4. The molecular formula of methane is: a) CH₄ b) CO₂ c) C₂H₆ d) H₂O

  5. The law of conservation of mass states that: a) Matter cannot be created or destroyed in a chemical reaction. b) Mass is directly proportional to volume. c) Elements with higher atomic numbers have higher masses. d) The mass of a substance depends on its state.

Part B: Fill in the Blanks

  1. A particle that carries a positive charge in an atom is called a ___________.

  2. The sum of the number of protons and neutrons in an atom gives its ___________ number.

  3. The chemical symbol for carbon is ___________.

  4. The molecular formula of water is ___________.

  5. In a chemical reaction, the total mass of the reactants is ___________ the total mass of the products.

Part C: Short Answer Questions

  1. Define an atom and a molecule.

  2. Explain the significance of the atomic number of an element.

  3. Write the chemical formula for carbon dioxide and methane.

  4. How is the concept of the law of conservation of mass applied in balancing chemical equations?

  5. Calculate the number of atoms present in 2 moles of oxygen (Oâ‚‚).

Part D: Long Answer Questions

  1. Describe the structure of an atom, including the arrangement of subatomic particles.

  2. Differentiate between an element and a compound, providing examples of each.

  3. A sample of sodium chloride (NaCl) contains 5.85 grams of sodium and 3.38 grams of chlorine. Verify if this data satisfies the law of conservation of mass. Show your calculations.

  4. Explain how chemical reactions are represented using balanced chemical equations. Provide an example.

  5. Consider the following reaction: 2H₂ + O₂ → 2H₂O. a) Identify the reactants and products. b) Explain the law of conservation of mass in this reaction.

Answer Key:

  1. a) Atom
  2. b) Atomic number
  3. b) Hâ‚‚O
  4. a) CHâ‚„
  5. a) Matter cannot be created or destroyed in a chemical reaction.
  6. Proton
  7. Mass
  8. C
  9. Hâ‚‚O
  10. Equal to
  11. An atom is the smallest particle of an element that retains its properties, and a molecule is a combination of two or more atoms held together by chemical bonds.
  12. The atomic number of an element represents the number of protons in the nucleus of its atom. It helps in identifying the element uniquely.
  13. Carbon dioxide: COâ‚‚, Methane: CHâ‚„
  14. The law of conservation of mass states that the total mass of the reactants in a chemical reaction is equal to the total mass of the products. To balance a chemical equation, the number of atoms of each element on the reactant side must be equal to the number of atoms of the same element on the product side.
  15. 2 moles of oxygen (Oâ‚‚) contain 2 x 6.022 x 10²³ atoms (Avogadro’s number) of oxygen atoms.
  16. An atom consists of a positively charged nucleus at the center, composed of protons and neutrons, surrounded by negatively charged electrons in energy levels or shells.
  17. An element is a pure substance made up of only one type of atom, whereas a compound is a substance composed of two or more different elements chemically bonded together. Examples: Element – Oxygen (O), Compound – Water (Hâ‚‚O).
  18. The law of conservation of mass is satisfied if the total mass of the reactants is equal to the total mass of the products. Here, 5.85 grams of sodium + 3.38 grams of chlorine = 9.23 grams, which is equal to the mass of sodium chloride, so the data satisfies the law of conservation of mass.
  19. Balanced chemical equations show the stoichiometry of a chemical reaction by representing the reactants and products with their respective coefficients such that the number of atoms of each element is the same on both sides of the equation. Example: 2H₂ + O₂ → 2H₂O.
  20. a) Reactants: 2Hâ‚‚ and Oâ‚‚; Products: 2Hâ‚‚O b) The number of atoms of each element on the reactant side (4H, 2O) is equal to the number of atoms of the same element on the product side (4H, 2O), satisfying the law of conservation of mass. [/expand]

CHAPTER-4 STRUCTURE OF THE ATOM[expand title=”Read Moreâž”” swaptitle=”🠔Read Less”]

Instructions:

All questions are compulsory.
Answer each question in the space provided.
Write the correct option or the answer as applicable.
Diagrams and equations, if required, should be neat and labeled.
Section A – Multiple Choice Questions (MCQs)

The subatomic particle that carries a positive charge is:
a) Electron
b) Neutron
c) Proton
d) Nucleus

The atomic number of an element is determined by the number of:
a) Protons
b) Neutrons
c) Electrons
d) Nucleons

The mass number of an atom is given by the total number of:
a) Protons and electrons
b) Protons and neutrons
c) Electrons and neutrons
d) Nucleons

Who proposed the plum pudding model of the atom?
a) J.J. Thomson
b) Ernest Rutherford
c) Niels Bohr
d) John Dalton

The maximum number of electrons that can be accommodated in the first energy level of an atom is:
a) 2
b) 8
c) 18
d) 32

Section B – Short Answer Questions

Define an atom. Mention its three main subatomic particles.

Explain the significance of the atomic number of an element.

Draw a labeled diagram of an atom showing the arrangement of subatomic particles.

What is the relation between the number of protons and electrons in a neutral atom?

Differentiate between the atomic number and the mass number of an element.

Section C – Long Answer Questions

Describe the Rutherford’s gold foil experiment and its major observations. How did it lead to the development of the nuclear model of the atom?

The electronic configuration of an element is 2, 8, 7. Identify the element and explain how this configuration is related to its position in the modern periodic table.

How do isotopes of an element differ from each other? Give an example of an isotope and explain its significance.

Section D – Application-Based Questions

An element has 7 protons, 7 neutrons, and 7 electrons. Identify the element and write its symbol in the standard notation.

Choose an element from the periodic table and write its electronic configuration. Explain how this configuration affects its chemical properties.

Section E – Value-Based Question

Imagine you are a scientist working in the field of atomic research. How would you explain the significance of understanding the atomic structure to a group of students? Write your answer in a paragraph.
Section F – HOTS (Higher Order Thinking Skills) Questions

The atomic number of an element is 16. Determine the following:
a) The number of protons and electrons.
b) The number of neutrons.
c) The electronic configuration.

“The discovery of isotopes shattered the belief in a fixed atomic mass for elements.” Justify this statement with suitable examples.

Section G – Practical-Based Questions

Describe a simple experiment to demonstrate the presence of subatomic particles in an atom.

Identify an element from the periodic table and research its isotopes. Tabulate the mass number and the number of protons and neutrons for each isotope.

Note: Use additional sheets if necessary.

Please note that the content and difficulty level of the worksheet can be adjusted according to the specific needs and requirements of the students. [/expand]

CHAPTER-5 THE FUNDAMENTAL UNIT OF LIFE[expand title=”Read Moreâž”” swaptitle=”🠔Read Less”]

Instructions:

  1. Read the questions carefully before answering.
  2. Write your answers in the spaces provided below each question.
  3. Attempt all questions.
  4. There is no negative marking for wrong answers.

Section A: Multiple Choice Questions

  1. Which of the following is considered the fundamental unit of life? a) Tissue b) Organ c) Cell d) Organ system

  2. Who was the first scientist to observe cells under a microscope? a) Robert Hooke b) Anton van Leeuwenhoek c) Robert Brown d) Matthias Schleiden

  3. The organelle responsible for producing energy in a cell is: a) Nucleus b) Golgi apparatus c) Mitochondria d) Endoplasmic reticulum

  4. Which type of cells contain chloroplasts? a) Plant cells only b) Animal cells only c) Both plant and animal cells d) None of the above

  5. The cell theory states that: a) Cells are the building blocks of tissues. b) All living organisms are made up of cells. c) Cells can only come from pre-existing cells. d) All of the above

Section B: Fill in the Blanks

  1. The control center of the cell is the ________.

  2. The green pigment responsible for photosynthesis is ________.

  3. The outermost covering of a plant cell is known as the ________.

  4. The process by which cells of multicellular organisms differentiate to perform specific functions is called ________.

Section C: True or False

  1. The cell wall is a feature present in animal cells. (True/False)

  2. Endoplasmic reticulum is responsible for protein synthesis. (True/False)

  3. All cells have a cell membrane. (True/False)

Section D: Short Answer Questions

  1. Differentiate between prokaryotic and eukaryotic cells.

  2. List three major differences between plant and animal cells.

Section E: Long Answer Question

  1. Explain the importance of the cell theory in modern biology.

Section F: Application-based Question

  1. Imagine you are a plant biologist studying the leaf cells of a particular plant species. Describe how the structure of leaf cells is related to their function in photosynthesis.

Section G: HOTS (Higher Order Thinking Skills) Question

  1. Some cells in our body have the ability to self-repair and regenerate. Give examples of such cells and explain their significance in maintaining the body’s health.

Section H: Project Work

  1. Choose any one plant or animal cell organelle and create a 3D model using craft materials. Provide a brief explanation of its structure and function.

Note: The worksheet is designed based on the CBSE pattern and includes different types of questions to assess students’ understanding of the chapter “The Fundamental Unit of Life.”[/expand]

CHAPTER-6 TISSUES[expand title=”Read Moreâž”” swaptitle=”🠔Read Less”]

Name: _________________________ Date: ________________________

Class: 10 Subject: Science Chapter: Tissues (Chapter 6)

Instructions:

  1. Read the questions carefully before attempting to answer them.

  2. Write your answers in the space provided below each question.

  3. Attempt all questions.

  4. Define tissues and explain their significance in multicellular organisms. (2 marks)

  5. Differentiate between plant tissues and animal tissues. Provide two examples of each. (3 marks)

  6. Identify the type of tissue in the following: a) Tissue responsible for transporting water and nutrients in plants. ________________ b) Tissue responsible for voluntary movements in our body. ________________ c) Tissue that makes up the outermost layer of the skin. ________________ d) Tissue found in the walls of the heart. ________________ (2 marks)

  7. Match the following: Column A Column B (i) Xylem (a) Conducts nerve impulses (ii) Epithelial (b) Conducts water and minerals in plants (iii) Nervous (c) Covers the surface of organs and body (iv) Muscle (d) Contracts to bring about movement (2 marks)

  8. Explain the structure and function of muscular tissue. (3 marks)

  9. How does the structure of a tissue determine its function? Give two examples to support your answer. (3 marks)

  10. Imagine you are a biologist studying tissues in living organisms. Design an experiment to observe and compare different types of plant tissues. Mention the materials required and the steps of the experiment. (4 marks)

  11. Observe the given image of a tissue and answer the questions below:

    [Insert an image of a tissue here]

    a) Identify the type of tissue shown in the image. _______________________ b) State one function of this tissue. ________________________________ c) Explain how the structure of this tissue is related to its function. ______________ (3 marks)

  12. Write short notes on any two of the following tissues: a) Meristematic tissue b) Blood tissue c) Simple squamous epithelium (4 marks)

  13. Research and write about one specific real-life application of the knowledge of tissues in the medical field. Include the types of tissues involved and their respective functions. (3 marks)

Total Marks: ________

Note: This is a sample worksheet, and the marks allocation is indicative. The actual marks distribution may vary depending on the discretion of the teacher or the examination pattern. [/expand]

 CHAPTER-7 MOTION[expand title=”Read Moreâž”” swaptitle=”🠔Read Less”]

Worksheet: Motion

Name: _______________________________ Date: ____________________

  1. Define the following terms: a) Motion: b) Rest:

  2. Differentiate between scalar and vector quantities. Provide one example of each.

  3. Identify the type of motion in each of the following scenarios: a) A car moving along a straight road. b) A child swinging on a swing. c) A revolving ceiling fan. d) A vibrating guitar string.

  4. A car travels a distance of 240 km in 4 hours. Calculate its average speed.

  5. A ball is thrown vertically upwards. It takes 5 seconds to reach its highest point. Calculate the time taken by the ball to return to the ground.

  6. An object covers a distance of 100 meters in 20 seconds. Calculate its speed.

  7. A boy travels from his home to the school with a speed of 3 m/s and returns back with a speed of 2 m/s. Calculate his average speed for the entire journey.

  8. The motion graph of a car is given below. Analyze the graph and answer the questions.

    Motion Graph

    a) What does the horizontal line in the graph represent? b) What does the slope of the graph indicate? c) Calculate the average speed of the car during the time interval from t = 0 to t = 20 seconds.

  9. State whether the following statements are True or False: a) An object in motion always has a non-zero acceleration. b) The speed of an object in motion remains constant throughout its journey. c) Friction is a factor that affects motion. d) The distance covered by an object can be zero even if it is in motion.

  10. Explain the factors affecting motion with suitable examples.

  11. A ball is dropped from the top of a building. It takes 3 seconds to reach the ground. Calculate the height of the building. (Consider g = 9.8 m/s²)

  12. A bicycle is moving with a speed of 5 m/s. How far will it travel in 10 seconds?

  13. An object moves with a uniform speed of 12 m/s. Calculate the distance covered by the object in 5 minutes.

  14. Mention two differences between uniform circular motion and non-uniform circular motion.

  15. Explain the concept of periodic motion with one example.

Note: This worksheet is designed to assess your understanding of the chapter “Motion.” Attempt all the questions and write your answers neatly.[/expand]

CHAPTER-8 FORCE AND LAWS OF MOTION[expand title=”Read Moreâž”” swaptitle=”🠔Read Less”]

Forces and Laws of Motion – Worksheet

Name:_____________________ Date:_________________ Class: 10

Multiple Choice Questions:

  1. Which of the following is an example of a non-contact force? a) Pushing a box b) Pulling a rope c) Magnetic force d) Frictional force

  2. According to Newton’s first law of motion, an object will remain at rest or in uniform motion unless acted upon by an external force. This is also known as the law of ___________. a) Inertia b) Acceleration c) Reaction d) Momentum

  3. Which of Newton’s laws explains why a person feels a backward push when a gun is fired? a) Newton’s first law b) Newton’s second law c) Newton’s third law d) None of the above

Short Answer Questions:

  1. Define force and give two examples of contact forces.

  2. State Newton’s second law of motion. Explain how force, mass, and acceleration are related according to this law.

  3. An object of mass 5 kg experiences a net force of 20 N. Calculate the acceleration of the object.

  4. A car is moving at a constant velocity of 20 m/s. What is the net force acting on the car? Explain your answer.

Application-Based Questions:

  1. A 10 kg box is pushed with a force of 30 N to the right and experiences a frictional force of 10 N to the left. Determine the acceleration of the box.

  2. A 50 kg person is standing on a scale in an elevator. The scale reads 600 N. Calculate the acceleration of the elevator when it is moving upward and when it is moving downward.

  3. A ball is thrown vertically upwards. Explain its motion at the highest point in terms of velocity and acceleration.

Answer Key:

  1. c) Magnetic force
  2. a) Inertia
  3. c) Newton’s third law
  4. Force is a push or pull acting on an object. Examples of contact forces include pushing a chair and pulling a book with a string.
  5. Newton’s second law of motion states that the net force acting on an object is directly proportional to the product of its mass and acceleration. F = ma, where F is the net force, m is the mass, and a is the acceleration.
  6. Acceleration = Net force / Mass = 20 N / 5 kg = 4 m/s²
  7. The net force acting on the car is zero since it is moving at a constant velocity. Newton’s first law states that an object in motion will remain in motion at a constant velocity unless acted upon by an external force.
  8. Acceleration = (30 N – 10 N) / 10 kg = 2 m/s²
  9. Upward acceleration = (600 N + 50 kg * 9.8 m/s²) / 50 kg = 23.8 m/s² (upward) Downward acceleration = (600 N – 50 kg * 9.8 m/s²) / 50 kg = 15.2 m/s² (downward)
  10. At the highest point, the ball’s velocity is zero, and its acceleration is equal to the acceleration due to gravity, which is approximately 9.8 m/s² directed downwards. [/expand]

CHAPTER-9 GRAVITATION[expand title=”Read Moreâž”” swaptitle=”🠔Read Less”]

Worksheet: Gravitation

Instructions:

  1. Attempt all questions.

  2. Write your answers in the spaces provided.

  3. Make sure to show all the steps in numerical problems.

  4. Use appropriate units wherever necessary.

  5. Define the term “gravitation.”

  6. State Newton’s Law of Universal Gravitation in words and write down the mathematical formula for it.

  7. What is the gravitational force acting on an object with a mass of 50 kg? (Take the acceleration due to gravity as 9.8 m/s²)

  8. Why do objects experience weightlessness in the International Space Station (ISS)?

  9. Calculate the weight of an object with a mass of 75 kg on the surface of Mars. (Acceleration due to gravity on Mars is approximately 3.7 m/s²)

  10. Explain why a feather falls slower than a hammer when dropped in a vacuum.

  11. The mass of the Moon is approximately 7.35 × 10^22 kg, and its average distance from the Earth is about 384,400 km. Calculate the gravitational force between the Earth and the Moon. (Use the universal gravitational constant, G = 6.67 × 10^-11 N m²/kg²)

  12. Two objects attract each other with a force of 0.1 N when they are 0.2 meters apart. If the distance between them is halved, what will be the new force of attraction between them?

  13. The weight of an object on the surface of Planet X is one-fourth its weight on Earth. Calculate the acceleration due to gravity on Planet X. (Take the acceleration due to gravity on Earth as 9.8 m/s²)

  14. A satellite orbits the Earth at an altitude of 300 km above the surface. Calculate its orbital speed. (Radius of Earth = 6,371 km, acceleration due to gravity at the satellite’s altitude = 8.67 m/s²)

Answers:

  1. Gravitation is the force of attraction that exists between objects with mass.

  2. Newton’s Law of Universal Gravitation states that every particle in the universe attracts every other particle with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers. Mathematically, it can be represented as:

    F = G * (m1 * m2) / r^2

    Where: F = Gravitational force G = Universal gravitational constant (6.67 × 10^-11 N m²/kg²) m1 and m2 = Masses of the two objects r = Distance between the centers of the two objects

  3. Gravitational force = m * g Gravitational force = 50 kg * 9.8 m/s² = ______ N

  4. Objects experience weightlessness in the International Space Station because it is in a state of continuous free fall around the Earth. The acceleration due to gravity and the centrifugal force from the ISS’s orbit cancel out, resulting in apparent weightlessness for objects inside the station.

  5. Weight on Mars = m * g Weight on Mars = 75 kg * 3.7 m/s² = ______ N

  6. In a vacuum, both the feather and the hammer experience the same gravitational force. However, the feather offers more air resistance due to its larger surface area, which slows down its fall compared to the hammer.

  7. Gravitational force between Earth and Moon = G * (m1 * m2) / r^2 Gravitational force = 6.67 × 10^-11 N m²/kg² * (5.98 × 10^24 kg * 7.35 × 10^22 kg) / (384,400,000 m)^2 Gravitational force = ______ N

  8. New force of attraction = (Original force) * (1 / 2)^2 New force of attraction = 0.1 N * (1 / 4) = ______ N

  9. Weight on Planet X = (1/4) * Weight on Earth Weight on Planet X = m * gX Weight on Earth = m * g gX = (1/4) * g Acceleration due to gravity on Planet X = ______ m/s²

  10. Orbital speed = √(G * M / r) Orbital speed = √(6.67 × 10^-11 N m²/kg² * (5.98 × 10^24 kg) / (6,371,000 m + 300,000 m)) Orbital speed = ______ m/s

Note: The answers to numerical problems may vary based on the students’ calculations. The blank spaces in the worksheet are left for students to fill in their responses.[/expand]

 CHAPTER-10 WORK AND ENERGY[expand title=”Read Moreâž”” swaptitle=”🠔Read Less”]

Instructions:

  1. All questions are compulsory.
  2. Read the questions carefully before answering.
  3. Show all your calculations and units wherever necessary.
  4. Write the correct option or answer in the space provided.

Worksheet:

  1. Define work in the context of physics.

  2. A force of 20 N is applied to push a box for a distance of 5 meters. Calculate the work done on the box.

  3. Identify the form(s) of energy involved in the following scenarios: a) A swinging pendulum b) Burning of wood c) A charged battery d) A stretched rubber band

  4. Explain the concept of kinetic energy with an example.

  5. A car of mass 1000 kg is moving with a velocity of 20 m/s. Calculate the kinetic energy of the car.

  6. State the law of conservation of energy and explain its significance.

  7. Identify the energy conversion taking place in the following situations: a) A light bulb producing light b) A hydroelectric dam generating electricity c) A windmill turning wind energy into mechanical energy d) A person eating food

  8. Calculate the gravitational potential energy of an object with a mass of 5 kg when it is raised to a height of 10 meters above the ground. (Take g = 9.8 m/s²)

  9. Explain how a roller coaster demonstrates the conversion of potential energy to kinetic energy during its ride.

  10. A person lifts a bucket weighing 25 kg to a height of 2 meters. Calculate the work done by the person. (Take g = 9.8 m/s²)

  11. Differentiate between kinetic energy and potential energy with examples.

  12. In a game, a student exerts a force of 50 N to pull a rope for a distance of 8 meters. Calculate the work done by the student.

  13. A ball is thrown vertically upwards. How does its kinetic energy and potential energy change during its flight?

  14. Describe the transformation of energy in a solar cell.

  15. Calculate the gravitational potential energy of an object with a mass of 2 kg when it is placed at a height of 5 meters above the ground. (Take g = 9.8 m/s²)

Answer Key:

  1. Work is defined as the product of force and displacement in the direction of the force.

  2. Work = Force × Displacement Work = 20 N × 5 m = 100 J

  3. a) Kinetic energy b) Chemical potential energy c) Electrical potential energy d) Elastic potential energy

  4. Kinetic energy is the energy possessed by an object due to its motion. Example: A moving car.

  5. Kinetic Energy = 0.5 × mass × (velocity)^2 Kinetic Energy = 0.5 × 1000 kg × (20 m/s)^2 = 200,000 J

  6. The law of conservation of energy states that energy cannot be created or destroyed; it can only be converted from one form to another. Its significance lies in maintaining a constant total energy in a closed system.

  7. a) Electrical energy to light energy b) Potential energy of water to electrical energy c) Kinetic energy of wind to mechanical energy d) Chemical energy to thermal energy and then to mechanical energy

  8. Gravitational Potential Energy = mass × gravity × height Gravitational Potential Energy = 5 kg × 9.8 m/s² × 10 m = 490 J

  9. As the roller coaster climbs a hill, its potential energy increases, and as it descends, its potential energy is converted back to kinetic energy.

  10. Work = Force × Displacement Work = 50 N × 2 m = 100 J

  11. Kinetic energy is the energy of motion, while potential energy is stored energy due to an object’s position or condition. Example: Kinetic energy – A moving car, Potential energy – A stretched rubber band.

  12. Work = Force × Displacement Work = 50 N × 8 m = 400 J

  13. As the ball goes upwards, its kinetic energy decreases, and its potential energy increases. At the highest point, the kinetic energy is zero, and the potential energy is at its maximum. As it falls back, potential energy decreases, and kinetic energy increases.

  14. A solar cell transforms solar energy (radiant energy) into electrical energy.

  15. Gravitational Potential Energy = mass × gravity × height Gravitational Potential Energy = 2 kg × 9.8 m/s² × 5 m = 98 J

Note: The worksheet should be designed based on the specific content taught in the classroom, and the above questions can be modified or expanded as needed.[/expand]

 CHAPTER-11 SOUND[expand title=”Read Moreâž”” swaptitle=”🠔Read Less”]

Name: ________________________ Date: ____________________

Instructions:

  1. Read each question carefully before attempting the answer.
  2. Attempt all the questions.
  3. Write your answers in the space provided.
  4. Neatly label and illustrate your diagrams, wherever required.
  5. Use appropriate units for numerical answers.
  6. The worksheet carries a total of 25 marks.

Objective: To assess students’ understanding of the properties of sound, behavior of sound waves, applications of sound, and its importance in everyday life.

Section A: Multiple Choice Questions (2 marks each)

  1. Sound is a form of: a) Light b) Energy c) Heat d) Magnetism

  2. The speed of sound is maximum in which of the following? a) Solids b) Liquids c) Gases d) Vacuum

  3. Which property of sound determines its loudness? a) Frequency b) Amplitude c) Pitch d) Wavelength

  4. The bending of sound waves when passing through a medium of different density is called: a) Reflection b) Refraction c) Diffraction d) Absorption

  5. An echo is a result of: a) Refraction of sound b) Absorption of sound c) Reflection of sound d) Transmission of sound

Section B: Short Answer Questions (3 marks each)

  1. Describe two applications of ultrasound in medical science.

  2. What is the difference between “pitch” and “loudness” of sound?

  3. How does the sound produced by a vibrating object in a medium travel to our ears?

  4. Explain why sound cannot travel in a vacuum.

Section C: Diagram-based Questions (5 marks each)

  1. Draw and label a labeled diagram of the human ear. Identify the three main parts responsible for hearing.

  2. Illustrate the process of “reflection of sound” with the help of a labeled diagram.

Section D: Long Answer Questions (7 marks each)

  1. Describe how dolphins use echolocation to navigate and find prey underwater. How is this ability helpful for their survival?

  2. Explain the working principle of a stethoscope. How does it help medical professionals in diagnosing various health conditions?

Section E: Application-based Questions (5 marks)

  1. A student witnessed lightning and, after some time, heard the sound of thunder. If the time interval between seeing the lightning and hearing the thunder was 6 seconds, calculate the approximate distance of the lightning from the student. (Speed of sound in air = 343 m/s)

Total Marks: 50

Note: This worksheet is designed as per the CBSE pattern and covers the key concepts of the “Sound” chapter in Class 9 Science.[/expand]

 CHAPTER-12 IMPROVEMENT IN FOOD RESOURCES[expand title=”Read Moreâž”” swaptitle=”🠔Read Less”]

Name: _______________________ Date: ___________________

Chapter: Improvement in Food Resources

Instructions:

  1. Read the questions carefully before attempting to answer.

  2. Answer all the questions in the spaces provided.

  3. Use appropriate diagrams, if necessary, to support your answers.

  4. Write in clear and legible handwriting.

  5. Define “improvement in food resources.”

  6. List any three methods used to improve food production. a) ____________________________________________________________________________ b) ____________________________________________________________________________ c) ____________________________________________________________________________

  7. Explain the term “sustainable food production” and why it is important.

  8. Look at the picture below and identify the method of improving food resources depicted.

    [Insert a picture related to improving food resources]

    Method: _______________________

  9. Briefly explain the advantages and disadvantages of the method depicted in question 4. Advantages:

    Disadvantages:

  10. Name any two high-yield crop varieties and mention the factors responsible for their high yield. a) High-yield crop variety: ________________________________________________________ Factors responsible for high yield: ______________________________________________

    b) High-yield crop variety: ________________________________________________________ Factors responsible for high yield: ______________________________________________

  11. Differentiate between organic farming and conventional farming.

  12. Describe any two animal husbandry practices that help in improving the quality and quantity of milk production. a) ____________________________________________________________________________ b) ____________________________________________________________________________

  13. What is genetic engineering in the context of improving food resources?

  14. State two advantages and two disadvantages of using genetically modified (GM) crops. Advantages:

    Disadvantages:

  15. Briefly explain the role of biofortification in improving food resources.

  16. Imagine you are a farmer. List three sustainable agricultural practices you would adopt to improve food production and protect the environment.

  17. Draw a labeled diagram of any one method of improving food resources (e.g., organic farming, genetic engineering, etc.). [Provide space for students to draw the diagram]

  18. In your opinion, which method of improving food resources is the most promising for the future? Justify your answer in a few sentences.

Total Marks: ________/30

Note: This worksheet is for educational purposes and may be adapted or modified based on the specific requirements of the class and school curriculum. [/expand]

 

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