9th Standard Science and Technology
39 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

In which of the following examples can you sense motion?

  • A stone lying on a hill
  • A stationary train
  • Leaves flying through air (correct)
  • The flight of a bird (correct)

    • Define the concept of 'displacement' and 'distance'.

    Distance is the length of the actual path traveled by an object, while displacement is the minimum distance between the starting and finishing points.

    What is the difference between speed and velocity?

    Speed is a scalar quantity that measures how fast an object is moving without regard to direction, while velocity is a vector quantity that includes both speed and direction of motion.

    According to the content, what is the basic purpose of the Science and Technology textbook?

    <p>Understand and explain to others the science and technology related to everyday lives.</p> Signup and view all the answers

    What is the purpose of the chapters 'Can you recall?' and 'Can you tell?' in the textbook?

    <p>To stimulate critical thinking</p> Signup and view all the answers

    What types of activities are included in the textbook to stimulate critical thinking?

    <p>Activities like 'Use your brain power!', 'Research', and 'Think about it.'</p> Signup and view all the answers

    The textbook encourages students to conduct experiments only under the supervision of teachers.

    <p>False</p> Signup and view all the answers

    The velocity of the object reaches a velocity of 50 km/hr in 10 seconds. Negative acceleration: A car, initially at rest, has a __________ acceleration.

    <p>Negative</p> Signup and view all the answers

    What is deceleration known as in comparison to acceleration? Provide a one-word answer.

    <p>Negative</p> Signup and view all the answers

    What is the minimum distance between the start and finish points of an object's motion called?

    <p>Distance</p> Signup and view all the answers

    When the force and displacement are in opposite directions, what is the work done by the force?

    <p>Negative</p> Signup and view all the answers

    Match the types of motion with their descriptions:

    <p>Distance and displacement = The minimum distance between start and finish points of an object's motion Uniform and non-uniform motion = Differentiation between consistent and varying motion</p> Signup and view all the answers

    What kind of motion is represented in the velocity-time graph shown in figure 1.8?

    <p>Uniformly accelerated motion</p> Signup and view all the answers

    For all uniformly accelerated motions, the velocity-time graph is a straight line.

    <p>True</p> Signup and view all the answers

    How much distance does the car cover between the 10th and 20th seconds based on the given velocity-time graph?

    <p>240 meters</p> Signup and view all the answers

    In the equation of motion v = u + at, the 'v' represents the final ____________.

    <p>velocity</p> Signup and view all the answers

    Match the following equations with their corresponding descriptions:

    <p>v = u + at = Relation between velocity and time s = ut + (1/2)at^2 = Relation between displacement and time v^2 = u^2 + 2as = Relation between displacement and velocity</p> Signup and view all the answers

    What is the value of 'u' in the equation u^2 = 49?

    <p>7</p> Signup and view all the answers

    Calculate the distance covered according to the second equation of motion given the values u=0, a=3 m/s^2, and t=5 seconds?

    <p>37.5</p> Signup and view all the answers

    According to Newton's first law of motion, which of the following statements is correct?

    <p>A static object does not move without the application of a force.</p> Signup and view all the answers

    The law of conservation of momentum states that total momentum remains constant when no external force acts on the system.

    <p>True</p> Signup and view all the answers

    What is the momentum of a cannon with a mass of 500 kg recoiling at a speed of 0.25 m/s?

    <p>125</p> Signup and view all the answers

    What is the formula for velocity?

    <p>Velocity = Displacement / Time</p> Signup and view all the answers

    How is speed calculated?

    <p>Speed = Distance / Time</p> Signup and view all the answers

    What is the average speed formula?

    <p>Average Speed = Total distance / Total time</p> Signup and view all the answers

    Define velocity and provide its formula.

    <p>Velocity is the displacement that occurs in unit time. Velocity = Displacement / Time</p> Signup and view all the answers

    What factors affect velocity?

    <p>Speed and direction</p> Signup and view all the answers

    Uniform motion always results in a straight line distance-time graph.

    <p>False</p> Signup and view all the answers

    Match the following terms with their meanings:

    <p>Acceleration = Rate of change of velocity Uniform motion = Equal distances covered in equal time intervals Non-uniform motion = Unequal distances covered in equal time intervals</p> Signup and view all the answers

    Why does the cup get pulled in Figure A?

    <p>Due to the force applied through the ruler</p> Signup and view all the answers

    What is the relationship between the displacement of the cup and the force applied through the ruler in Figure B?

    <p>Opposite</p> Signup and view all the answers

    Why doesn’t the cup get displaced in Figure C?

    <p>Gravitational force acting on the satellite and its displacement are perpendicular</p> Signup and view all the answers

    What is the type of work done in Figures A, B, and C?

    <p>Zero</p> Signup and view all the answers

    What is the relationship between the applied force and the displacement?

    <p>Positive, negative, or zero work</p> Signup and view all the answers

    What is the formula for total energy of an object falling freely under the influence of gravitational force?

    <p>mgh</p> Signup and view all the answers

    What is the unit of power in the SI system and what is it equivalent to?

    <p>J/s, joule per second</p> Signup and view all the answers

    The unit used to measure power in the industrial sector is called '______ power'.

    <p>horse</p> Signup and view all the answers

    If an object is in free fall, its total energy remains constant throughout the fall.

    <p>True</p> Signup and view all the answers

    What unit is used to measure energy in commercial use?

    <p>Kilowatt hour</p> Signup and view all the answers

    Study Notes

    Science and Technology Standard IX

    • The textbook is based on the new syllabus and aims to help students understand and explain scientific concepts related to everyday life.
    • The book covers various branches of science and includes activities, experiments, and projects to stimulate students' thinking and curiosity.

    Competency Statements Standard IX

    • The living world:
      • Distinguish between life processes of plants and animals
      • Explain the importance of microorganisms in antibiotic production
      • Classify plants scientifically
    • Energy:
      • Explain the inter-relationship between work and energy
      • Identify the type of work done in everyday instances
      • Solve numerical problems related to work, energy, and power
    • Substances:
      • Describe the form, structure, and shape of substances
      • Verify laws of chemical combination, conservation of mass, and constant proportions
      • Classify substances of everyday use with the help of indicators
    • Diet and Nutrition:
      • Explain the importance of tissue culture and its use in agriculture
      • Analyze the inter-relationship between the food chain and energy pyramid
    • Natural Resources and Disaster Management:
      • Explain the application of modern science and technology in the work of the meteorological department
      • Classify garbage and produce manure from waste materials
    • Motion, Force, and Machines:
      • Write equations of motion and use them to solve numerical problems
      • Verify the cause and effect relationships between motion and laws of motion
    • The Universe:
      • Use the telescope for sky watching
      • Explain the contribution of astronomy and modern technology to human progress
    • Information Communication Technology (ICT):
      • State the fundamental changes brought about by computer technology in society
      • Use the computer to search for information, solve problems, and explain scientific concepts

    Contents of the Textbook

    • Laws of Motion
    • Work and Energy
    • Current Electricity
    • Measurement of Matter
    • Acids, Bases, and Salts
    • Classification of Plants
    • Energy Flow in an Ecosystem
    • Useful and Harmful Microbes
    • Environmental Management
    • Information Communication Technology (ICT)
    • Reflection of Light
    • Study of Sound
    • Carbon: An Important Element
    • Substances in Common Use
    • Life Processes in Living Organisms
    • Heredity and Variation
    • Introduction to Biotechnology
    • Observing Space: Telescopes

    Laws of Motion

    • Motion is a relative concept

    • Examples of motion: flight of a bird, leaves flying through air

    • Non-examples of motion: a stationary train, a stone lying on a hill

    • Factors to consider when deciding if an object is moving or not: frame of reference, observation, and measurement### Motion and Measurement

    • An object is said to be in motion if its position changes with respect to its surroundings.

    • Displacement is the minimum distance between the starting and finishing points.

    • Distance is the length of the actual path traveled by an object in motion.

    Distance and Displacement

    • Sheetal walked to her friend's house and then to school, covering a total distance of 1700 m.
    • Her displacement was 1300 m (the shortest distance between her initial and final positions).
    • Distance is a scalar quantity, whereas displacement is a vector quantity.

    Speed and Velocity

    • Speed is the distance traveled by an object in a unit of time.
    • Velocity is the displacement of an object in a unit of time.
    • The units of speed and velocity are the same (m/s in SI system and cm/s in CGS system).
    • Speed is related to distance, while velocity is related to displacement.

    Effect of Speed and Direction on Velocity

    • Velocity depends on both speed and direction.
    • Changing the speed while keeping the direction same affects velocity.
    • Changing the direction while keeping the speed same affects velocity.
    • Changing both speed and direction affects velocity.

    Uniform and Non-Uniform Motion

    • If an object covers equal distances in equal time intervals, it is said to be moving with uniform speed.
    • If an object covers unequal distances in equal time intervals, it is said to be moving with non-uniform speed.
    • Amar, Akbar, and Anthony were traveling in different cars with different velocities, covering different distances in equal time intervals.

    Acceleration

    • The rate of change of velocity is called acceleration.
    • Acceleration is the change in velocity per unit of time.
    • An object can have positive, negative, or zero acceleration.
    • Positive acceleration means an increase in velocity, negative acceleration means a decrease in velocity, and zero acceleration means no change in velocity.

    Distance-Time Graph

    • A distance-time graph shows the relation between the distance traveled by an object and the time taken.
    • In uniform motion, the distance-time graph is a straight line.
    • In non-uniform motion, the distance-time graph is not a straight line.

    Velocity-Time Graph

    • A velocity-time graph shows the relation between the velocity of an object and the time taken.
    • In uniform acceleration, the velocity-time graph is a straight line.
    • The acceleration of an object can be determined from the slope of the velocity-time graph.

    Equations of Motion

    • The three equations of motion relate displacement, velocity, acceleration, and time.
    • The equations are:
      1. v = u + at (relation between velocity and time)
      2. s = ut + (1/2)at^2 (relation between displacement and time)
      3. v^2 = u^2 + 2as (relation between displacement and velocity)### Velocity-Time Graph
    • The velocity-time graph is used to describe the motion of an object.
    • The graph can be used to find the distance covered by an object in a given time.
    • The area of the quadrangle DOEB in the graph represents the distance covered by the object.

    Equations of Motion

    • The first equation of motion is v = u + at, where v is the final velocity, u is the initial velocity, a is the acceleration, and t is the time.
    • The second equation of motion is s = ut + (1/2)at^2, where s is the distance covered, u is the initial velocity, t is the time, and a is the acceleration.
    • The third equation of motion is v^2 = u^2 + 2as, where v is the final velocity, u is the initial velocity, a is the acceleration, and s is the distance covered.

    Uniform Circular Motion

    • Uniform circular motion is a type of motion in which an object moves in a circular path with a constant speed.
    • The direction of the velocity of an object in uniform circular motion is constantly changing.
    • Examples of uniform circular motion include the motion of a stone in a sling, the motion of a point on a bicycle wheel, and the motion of a car around a circular track.

    Newton's Laws of Motion

    • Newton's First Law of Motion states that an object at rest will remain at rest, and an object in motion will continue to move with a constant velocity, unless acted upon by an external force.
    • Newton's Second Law of Motion states that the force applied to an object is equal to the rate of change of its momentum.
    • Newton's Third Law of Motion states that every action force has an equal and opposite reaction force.

    Momentum

    • Momentum is the product of an object's mass and velocity.
    • Momentum is a vector quantity.
    • The unit of momentum is kg m/s in the SI system and g cm/s in the CGS system.

    Law of Conservation of Momentum

    • The law of conservation of momentum states that the total momentum of a closed system remains constant over time.
    • The law of conservation of momentum is a corollary to Newton's Third Law of Motion.
    • The law of conservation of momentum can be used to explain the recoil of a gun, the launch of a rocket, and the collision of two objects.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Description

    This quiz is based on the textbook for 9th standard science and technology in the Maharashtra State Board syllabus.

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser