CBSE - Class 9th - Science - Ch 11 - Work and Energy - Question Bank

Hello Students,

As a continuation to my previous post on Question bank for Chapter 10th, In this post, I would like to share question bank for Chapter 11th which is Work and Energy. These questions shall help you revise all your fundamental concepts related to Work and Energy Module and will help you stay better prepared for exams.

CBSE - NCERT - Class 9th - Science

Chapter 11th - Work and Energy

• What is Work?

• What are the 2 conditions which needs to be satisfied for work to be done?

• How is Work defined in Science? Give its mathematical expression.

• A constant force is applied to push a box and throughout the duration of applied force, the box moves through a distance of 4 m. If the force applied was 10 N. Calculate the work done.

• A force of 5 N is applied to a box. Force is applied for 2 seconds and at the end the box stays at the same place. Calculate the work done.

• A drinking water-can weighing 20 kg is lifted from the kitchen floor and kept at the platform at a height of 1.5 m from the floor. Calculate the work done by the person on the water can.

• Can work done be negative? How?

• How is Energy defined in Science?

• What are the various forms of Energy?

• What is Kinetic Energy? Derive a mathematical expression of Kinetic Energy.

• A car having a mass of 200 kg is moving at a uniform velocity of 10 m/s. Calculate the Kinetic energy possessed by the car.

• A bike is moving a velocity of 5 m/s. A force is applied via engine and it reaches a velocity of 15 m/s.  Calculate the work done on the bike by its engine if its mass is 100 kg.

• What will happen to the kinetic energy of a moving object if its velocity is tripled?

• What is Potential Energy? Give its mathematical expression.

• What is Gravitational Potential Energy?

• An object of mass 10 kg is tied at certain height from the ground. The potential energy possessed by the object is 49 J. Find the height at which the object is tied from the ground. Assuming g=9.8m/s²

• State the Law of Conservation of Energy. How does it applies to an object falling from a certain height?

• Define Power. 

• Define 1 Watt.

• Alen and Matt did work of 1000 J each while doing a task. Alen took 10 seconds while Matt took 20 seconds to complete the task. Who spent more power?

• Lisa climbs up a 10 m high hill in 50 seconds. Assuming the mass of Lisa to be 50 kg and g=10 m/s², Calculate her Power.

• Convert 1 KW h to Joules.

• A Laptop of 45 W runs for 15 hrs a day. Calculate the energy usage in the month of April. Calculate the energy bill if the fixed charge is Rs. 50 and consumption charge is Rs. 4 per unit. Assume no other charges or usage of any other equipment over the month. 

Hope you would find the question bank useful for preparation. Do let me know your thoughts by commenting below.

CBSE - Class 9th - Science - Ch 10 - Gravitation - Question Bank

Hey friends, In this post we shall work towards preparing for the chapter 10th which is about Gravitation. In this chapter, you shall learn primarily about the concepts of Gravitation, the Laws of Gravitation and the way an object's motion is influenced on being acted upon by Gravitation.

CBSE - NCERT - Class 9th - Science

Chapter 10 - Gravitation

• What is Centripetal Force?

• As per Newton's third law of motion, to every action there is an equal and opposite reaction. Then why does an a falling apple gets attracted towards the earth and earth doesn't move towards the apple?

• State the Universal Law of Gravitation.

• Derive the mathematical equation governing the Universal Law of Gravitation.

• What is the significance of Gravitational Constant G? Give its value with SI Unit.

• Calculate the Force exerted by Moon on the Earth. Given - Mass of Moon is 7.4 x 10²² Kg and Mass of Earth is 6 x 10²⁴ Kg. Assume that they are separated by a distance of approx 4 x 10⁵ Km.

• What is acceleration due to gravity? Derive the mathematical expression for calculating gravity and calculate its value.

• A paper cup is dropped from a building roof top and it reaches ground in 2 second. Calculate the following:
• Its speed when it strikes the ground.
• Its average speed during the fall.
• The height of the building from where it was dropped.

• Calculate the velocity of the ball when it was thrown vertically upwards and reaches 40 m high before returning back and the time taken for the ball to reach that height.

• What is Weight? Give its SI Unit.

• The value you see while measuring an object in weighing machine is Mass or Weight of the object? Explain why.

• What is the weight of an object having 50 kg mass?

• If your mass is 60 Kg. Calculate your weight on earth and moon?

• What is Thrust?

• What is Pressure? Give its SI unit as well.

• A wooden cuboidal box having a mass of 10 kg with dimensions as 10 m x 20 m x 40 m is lying on bed. Calculate the pressure applied by the box on bed if it is made to lie with
• 10 m x 20 m surface as the base.
• 10 m x 40 m surface as the base.

• How does the concept of pressure applies to Liquids?

• Why does a ship made up of iron and steel does not sink in water while the same amount of metal in the form of iron blocks or sheet would sink instantly?

• What is Buoyant force?

• State the Archimedes Principle. What are its applications?

• You have a bag of cotton and a bag of iron each having a mass of 10 kg as measured in weighing machine. Even though the mass is same, in reality, one is heavier than another. Which one is that and why?

• Your mass shows 50 kg in weighing machine? Is your actual mass more or less than 50 kg as shown in weighing machine?

• Define Density?

• Define Relative Density with mathematical expression.

• What is the Relative Density of an Object when its density is 4000 kg m^-3. Given that density of water is 1000 kg m^-3.

Hope you found the above questions easy to understand and helpful for revision. If you would like to have more such questions or solutions to above questions, do let me know by commenting below.

CBSE - Class 9th - Science - Ch 9 - Force and Laws of Motion - Question Bank

In the previous post, we learnt about Motion as an introduction of Physics in Class 9th Science units. In this chapter we shall delve deeper into Physics by Learning more about the various laws of motion and its associated numerical calculations which shall help us build our foundation of Physics and associated mathematics for Class 11th later.

CBSE - Class 9th - Science

Chapter 9 - Force and Laws of Motion

• What is Force?

• How does an Object move? Why do they move?

• What are Balanced and Unbalanced Forces? Explain by giving examples.

• What is Friction and Friction Force?

• State Newton's First Law of Motion.

• What is Inertia? Why is First Law of Motion also referred to as Law of Inertia?

• Take a Glass, a Card and a five rupees coin. Place the Coin over the Card and the card on top of Glass. When the card is horizontally flicked fast with the finger, the coin placed over it falls in the tumbler instead of going with the card. Why?

• What is mass? How is it related to Inertia?

• Define Momentum. What is its SI Unit?

• State Newton's Second Law of Motion.

• Give the Mathematical formulation of Newton's Second Law of Motion.

• While trying to catch cricket ball, why does the fielder in the ground gradually pulls his hands backward along with the moving ball?

• A Force is applied from the back of a car of 500 kg at rest for 50 seconds to reach a velocity of 10 m/s. Calculate the force applied. If the same amount of force was applied for 25 seconds, what would have been the velocity of the car.

• Calculate the force needed to be applied to move:
• A Box of 10 kg at 3 m/s²
• A Box of 7 kg at 4 m/s²

• A Mini Truck weighing 1000 kg travelling at 72 km/h, applies brakes to stop. It took 5 second for it to come to rest. Calculate the amount of force exerted by the truck brakes.

• A force of 10 N can give a red color box an acceleration of 4 m/s². The same amount of force applied to a green box can give an acceleration of 5 m/s². Calculate the amount of acceleration that can be produced if both the object are tied together.

• State Newton's third law of motion.

• When a Gun is fired, why does the Shooter experiences some force pushing him backwards?

• What is the Law of conservation of momentum? Derive mathematical equation for the same.

• A Bullet weighing 20 g is fired from a Gun weighing 1 kg at a velocity of 100 m/s. Calculate the recoil velocity of the Gun.

• A Girl weighing 35 kg jumps with a horizontal velocity of 4 m/s over a stationary skating board weighing 5 kg. Assuming there is no other unbalanced force acting, what is their combined velocity as the skating board starts moving?

• Two cars approaching towards each other on road, collide at each other at high speed. After the collision, they got jammed to each other and both started moving in one direction for some time. The first car coming from Left side weighed 500 kg and had a velocity of 4 m/s. The second car coming from Right side weighed 800 kg and had a velocity of 2 m/s. Assuming the friction to be negligible, In which direction does both the cars move after their collision and at what velocity.

I hope these questions would help stay better prepared for exams. For solutions to the above questions, do comment below your thoughts and let me know.

CBSE - Class 9th - Science - Ch 8 - Motion - Question Bank

Dear Students, till previous chapters we studied about Chemistry and Biology. With Chapter 8th, We shall get started with Physics. In this post, we shall study the fundamental questions which will help you build better foundation and revision of which shall help you stay better prepared for your exams.

To better understand physics fundamentals, the best way is to solve the mathematical problems instead of doing plain reading. Hence this post involve an optimum number of mathematical problems to help you better understand the concepts.

CBSE - NCERT - Class 9th - Science

Chapter 8 - Motion

• What is the difference between Distance and Displacement?

• Can an Object have zero displacement in-spite of moving certain distance? Explain with examples.

• What is the difference between Uniform and Non-Uniform motion?

• Define speed? What is its SI Unit & Symbol?

• Nisha runs 100 m. First half of the distance in 10 second and second half in 5 second. What is the average running speed of Nisha?

• Define Velocity with mathematical expression?

• During rain, why does the sound of thunder reaches after sometime we see thunder lightning?

• What is the difference between speed and velocity?

• Ram started for Delhi from Mumbai with car odometer reading at 1400 km. On reaching Delhi, odometer reading was 3000 km. If the trip tool 25 hours, calculate his average speed in Km/h and m/s.

• Vijay covers 240 m by swimming from one end to other and back along the same path. She completes it in 2 minutes. Calculate the average speed and average velocity of Vijay.

• Define Acceleration with mathematical expression and its SI Unit.

• A Truck driver starts the truck from the state of rest to a velocity of 12 m/s in 1 min. Suddenly due to traffic, he slows down and comes down to 3 m/s in 30 seconds. Calculate the acceleration of the truck in both the cases?

• A car is moving with uniform velocity of 50 km/h for 5 hours. Find out the distance traveled by  the car between 2nd and 5th hour. Solve the problem using graphical method.

• State the set of 3 equation for motion involving Velocity, Acceleration, Distance and Time for an object moving along a straight line with uniform acceleration.

• Derive the equation for Velocity - Time relation for an object that moves under uniform acceleration. Explain with the help of graph.

• Derive the equation for Position - Time relation for an object moving under uniform acceleration. Explain with the help of graph.

• Derive the equation for Position - Velocity relation for an object moving under uniform acceleration. Explain with the help of graph.

• A car starting from the state of rest reaches a velocity of 36 Km/h in 5 minutes. Assuming the acceleration to be uniform, find 
• Acceleration of the car.
• Distance traveled by the car while attaining this speed.

• An Auto travelling at 36 Km/hr accelerates to 72 Km/hr in 10 seconds. Find 
• Acceleration of the vehicle
• Distance covered by the car during that time period.

• A car in motion applies brake to produce negative deceleration of 18 m/s² . It stops in 2 seconds and comes to rest. Find
• Its initial speed before applying brakes
• Distance traveled by car before it stopped.

• Take a stone, tie it to one end of a thread and move it in circular path with constant speed by holding the thread at other end. If you release the thread, in which direction does the stone moves after it is releases? Why?

Hope you would find these questions useful. If you would like to go through the answers/solutions to these questions, do comment below and let me know.

CBSE - Class 9th - Science - Ch 7 - Diversity in Living Organisms - Question Bank

Hey friends, In continuation with our series for Science Question bank for Class 9th CBSE, after previous post on Chapter 6, in this post let me give you the question bank for Class 7th which would help you for revision of all the concepts to help you be better prepared for exams.

CBSE - NCERT - Class 9th - Science

Chapter 7 - Diversity in Living Organisms

• What is the need for us to classify different organisms?

• What is Evolution

• Who are called "Primitive" or "Lower organisms"?

• Who are called "Advanced" or "Higher Organisms"?

• Give some examples of various characteristics used for a hierarchical classification.

• What do you mean by Biodiversity?

• What are the 5 kingdoms, Whittaker had proposed for the classification of Living Organisms. Explain with diagram of classification tree and basis for classification.

• How are Monera subdivided further as per modification introduced by Woese in classification?

• What is the scheme in which the sub-groups of classification are named at various stages.

• Explain the characteristics of Monera with examples and their diagrams.

• Explain the characteristics of Protista with examples and their diagrams.

• What is the difference between Autotrophic vs Heterotrophic mode of nutrition?

• Explain the characteristics of Fungi with examples and their diagrams.

• What are Litchens?

• Explain the characteristics of Plantae with examples and their diagrams.

• Explain the characteristics of Animalia with examples and their diagrams.

• Name the sub groups into which Kingdom Plantaeis further classified. Explain with Diagram of the classification tree and basis for classification.

• Explain the characteristics of Thallophyta with examples and their diagrams.

• Explain the characteristics of Bryophyta with examples and their diagrams

• Explain the characteristics of Pteridophyta with examples and their diagrams.

• What is the difference between Cryptogams vs Phanerogams?

• Explain the characteristics of Gymnosperms with examples and their diagrams.

• Explain the characteristics of Angiosperms with examples and their diagrams.

• What is the difference between Monocots and Dicots?

• What are the sub-groups into which Kingdom Animalia is further classified?

• What are the characteristics of Porifera. Give examples. Explain with diagram.

• What are the characteristics of Coelenterata. Give examples. Explain with diagram.

• What are the characteristics of Platyhelminthes. Give examples. Explain with diagram.

• What are the characteristics of Nematoda. Give examples. Explain with diagram.

• What are the characteristics of Annelida. Give examples. Explain with diagram.

• What are the characteristics of Arthropoda. Give examples. Explain with diagram.

• What are the characteristics of Mollusca. Give examples. Explain with diagram.

• What are the characteristics of Echinodermata. Give examples. Explain with diagram.

• What are the characteristics of Protochordata. Give examples. Explain with diagram.

• What are the characteristics of Vertebrata. Give examples. Explain with diagram.

• What are the characteristics of each of the six classes, Vertebrata is sub=grouped into with examples.
• Cyclostomata
• Pisces
• Amphibia
• Reptilia
• Aves
• Mammalia

• Why do we need a Scientific naming system or Nomenclature for living Organisms.

I hope you would find this question bank useful for end to end preparation for this chapter. This chapter is one of most difficult chapter in Biology due to so many classification. They way I would recommend is to read this chapter at-least 3 times a day for at-least 7 days to better remember all the names, characteristics of each type of organism. 

If you are aspiring to make a career in Medical science, then this chapter forms the base of your preparation.

CBSE - Class 9th - Science - Ch 6 - Tissues - Question Bank

Hey Friends! In my last post, I started with the first chapter in Biology with "The fundamental unit of Life". In this post, I would like share questionnaires from the next chapter involving group of cells i.e. Tissues.

CBSE - NCERT - Class 9th - Science

Chapter 6 - Tissues

• What is a Tissue? Give examples of tissues.

• Explain Meristematic Tissue with examples.

• What is the difference between Apical Meristem, Intercalary Meristem and Lateral Meristem?

• Why does the cells of Meristematic tissues lack vacuoles?

• What are the two different types of Plant tissues?

• What are the four different types of Animal tissues?

• Describe the tissues in a section of a stem with a diagram.

• What is Chlorenchyma?

• What is Aerenchyma?

• What is Collenchyma? How does it help plants?

• What is Schlerenchyma?

• What is Epidermis and How does it help plants?

• How does long hair like parts of Epidermal cells of roots help the plants?

• Explain the different types of cells present in Xylem.

• Explain the different types of cells present in Phloem.

• Describe the different types of Epithelial tissue with diagram.
• Squamous 
• Stratified Squamous
• Cuboidal
• Columnar (Ciliated)

• What is Glandular Epithelium?

• Why is blood known as Connective tissue?

• Describe the different types of Connective tissues with diagram.
• Blood cells
• Compact bone
• Hyaline Cartilage
• Areolar tissue
• Adipose tissue

• What are the functions of Ligaments and Tendons?

• Describe the different types of muscle fibres with diagram
• Striated Muscle
• Smooth Muscle
• Cardiac Muscle

• Describe the Nervous tissue with diagram

I hope the above questionnaires shall help you prepare well for your exams. Do let me know if you are also looking for solutions to the above questions by posting in the comments below.

CBSE - Class 9th - Science - Ch 5 - The Fundamental Unit of Life - Question Bank

In earlier chapters of the book, we are focused on Chemistry syllabus of class 9th. Starting with this post, Let me share you the question bank by getting started with Biology section of Class 9th syllabus.

CBSE - NCERT - Class 9th - Science

Chapter 5 - The Fundamental Unit of Life

• What is a Cell?

• Give 4 Examples of Unicellular Organisms.

• What do you mean by Unicellular and Multi-cellular Organisms. Give example for each type of the organism.

• Draw the Diagrams of various cells from the Human Body
• Smooth Muscle Cell
• Blood Cells
• Nerve Cells
• Ovum
• Bone Cell
• Sperm
• Fat Cell

• Explain the 3 features of a cell
• Plasma Membrane
• Nucleus
• Cytoplasm

• Why is Plasma Membrane called a Selectively Permeable membrane?

• How does Substance like Carbon Dioxide or Oxygen move across the Cell Membrane?

• What is Osmosis?

• What are the various scenarios possible if we put an animal cell or a plant cell into a solution of Sugar or Salt in Water? Describe by explaining the concept of Hypotonic Solution, Isotonic Solution and Hypertonic Solution.

• What is Endocytosis? Who uses this process and for what purpose?

• What is Plasmolysis?

• What are the components inside the nucleus of an atom?

• What is Nucleoid?

• What are Prokaryotes? 

• Give Difference between Prokaryotes and Eukaryotes.

• Describe the structure of a Prokaryotic cell with an example.

• What is Cytoplasm in a Cell?

• Describe the structure and function of following cell organelles:
• Endoplasmic Reticulum
• Golgi Apparatus
• Lysosomes
• Mitochondria
• Plastids
• Vacuoles

• What is Membrane Biogenesis?

• Draw the diagram of Animal Cell & describe each of its components.

• Draw the diagram of plant cell & describe each of its components.

• Why is Lysosomes also known as "Suicide Bags" of a Cell.

• Why is Mitochondria called as the "Powerhouse of the Cell". How is it associated with ATP?

• How is Mitochondria able to make some of its own proteins?

• What are the 2 types of Plastids? Describe each.

• Give the difference between the two types of Cell Division - Mitosis and Meiosis. Describe with diagrams.

Hope the above questions would help you revise your textbook contents well. If you are looking for solutions to the above questions, do let me know by commenting below.

CBSE - Class 9th - Science - Ch 4 - Structure of the Atom - Question Bank

Hey Friends, Hope you liked my previous post of Question Bank of Chapter 3 - Atoms and Molecules. In this post, I would like to share the questions from Chapter 4 - Structure of the Atom, to help you revise the concepts of this chapter to prepare well for exam.

CBSE - NCERT - Class 9th - Science

Chapter 4 - Structure of the Atom

• On rubbing two objects together, why does it get electrically charged?

• What are Canal rays?

• What is the mass of 1 proton and 1 electron?

• Explain Thomson’s model of an atom with Diagram.

• Explain the setup of Rutherford’s experiment involving Scattering of alpha (α) particles by a Gold Foil. 

• What were the observations made during the Rutherford's experiment of alpha particle scattering? Also Give the conclusions given by Rutherford for each of the observations.

• On the basis of Rutherford’s alpha (α) particles scattering experiment, what were the features of the Nuclear model of an atom as proposed by Rutherford?

• What were the drawbacks of Rutherford’s Model of Atom?

• What are the postulates put forward by Neils Bohr about the model of an Atom?

• Neutrons are present in the nucleus of all atoms, except one Element. Which one is that?

• What are the 3 rules followed for writing the number of electrons in different orbit or shells as suggested by Bohr and Bury?

• Draw the atomic structure showing orbit and electron distribution for
• Neon
• Sodium
• Argon

• What is the Valency of following elements
• Helium
• Neon
• Carbon
• Phosphorus
• Boron
• Aluminium
• Magnesium
• Fluorine

• Why is the Valency of Fluorine 1 instead of 7?

• Define Atomic Number.

• How is the Mass Number of Atom determined?

• Give the notation for representing an atom using atomic number, mass number and atomic symbol. Give an Example.

• Define Isotopes with an example.

• Derive the atomic mass of Chlorine containing 2 isotope of 35u and 37u in the ratio of 3:1.

• Give some examples of practical application of Isotopes in various fields.

• Define Isobars with examples.

• Who discovered Electron?

• Who discovered Proton?

Hope the above questions would help you prepare well for exams. If you are looking for answers to the above questions as well, do comment below and let me know your thoughts.

CBSE - Class 9th - Science - Ch 3 - Atoms and Molecules - Question Bank

Hi Friends, Hope you liked my previous question bank on Chapter 2 - Is Matter around Us Pure. In this post I would like to share a set of Questions from Chapter 3 - Atoms and Molecules.

CBSE - Class 9th - Science Book

Chapter 3 - Atoms and Molecules

• What are the 2 Laws of Chemical combination as established by Lavoisier and Proust? Explain each of them.

• What is an Atom?

• State the Postulates of Dalton’s Atomic Theory.

• What is IUPAC?

• What is the atomic Symbol of 
• Gold
• Iron
• Lead
• Potassium
• Silver

• Define Relative atomic mass of the atom of an element.

• What is the atomic mass of 
• Carbon
• Oxygen
• Chlorine

• What is a Molecule?

• What is Atomicity? What is the atomicity of 
• Oxygen
• Phosphorus
• Sulphur

• What is a compound? Give 2 examples with its constituents.

• What is an Ion? 

• What are the 2 types of Ions? 

• Give few examples of Ionic Compounds.

• What is Valency?

• Name few elements which show more than One Valency.

• Derive the formulae of below compounds with diagram depicting valency exchange:
• Hydrogen Sulphide
• Calcium Oxide
• Sodium Nitrate
• Calcium Hydroxide

• What is the difference between Molecular Mass and Formula Unit Mass? Give Example and explain.

• Define One Mole. What is the number of particles present in 1 mole of any substance?

I would request you to work on the Important numerical involving Molecular Mass, Mole, etc to stay more prepared for exams.

Would you like to have solutions for the above questions? Let me know your thoughts by commenting below.

All the Best for Exams!

CBSE - Class 9th - Science - Ch 2 - Is Matter Around Us Pure - Question Bank

Hey friends, Read the post to find a list of questions to help you revise your concepts and stay prepared for the exams.

CBSE NCERT - Class 9th - Science Book 

Chapter 2 - Is Matter Around Us Pure.

• When is something said to be a Pure substance?

• What is a mixture?

• What is a Homogeneous mixture or solution?

• What is a Heterogeneous mixture or solution?

• What is an Alloy?

• What is a solution?

• Describe the two components - Solvent and Solute.

• What are the properties of a solution?

• What is a saturated solution?

• What is an Unsaturated solution?

• Define Concentration of a solution.

• What is a Suspension?

• What are the properties of a Suspension?

• What is a Colloidal Solution?

• What is Tyndall Effect?

• What are the properties of a Colloid?

• What is Dispersed phase and Dispersing Medium

• What is Centrifugation? Mention some of its applications.

• Explain Sublimation process.

• What is Chromatography? Mention some of its applications.

• Explain the process of Distillation.

• What is Fractional Distillation?

• Explain the process of Separating the compounds of air with diagram

• What is Crystallization? Mention some of its applications.

• Explain the process of Water Purification System in Cities with a Diagram

• What are the 2 different types of Pure Substances?

• Explain the properties of Metals, Non-metals and Metalloids with examples.

• What is a compound?

• Give the difference between Mixtures and Compounds.

Hope you would find it useful for your concepts revision. If you are looking for solutions also, do comment below and let me know your thoughts