Competency based questions Class 9 Science
DPS Guwahati (CBSE Affiliated School) has recently published Competency based questions for the students of class 9. Here in this page we have given class 9 science competency based questions provided by DPS Guwahati school.
Also See: Assertion Reason Questions Class 9
Matter In Our Surroundings
(1) Name the phenomenon which causes one crystal of potassium permanganate to turn a beaker of water purple.
(a) centrifugation
(b) filtration
(c) diffusion
(d) sedimentation
(2) When water boils its temperature
(a) Keeps on increasing as long as heating is continued.
(b) may decreases or increases depending on the place where the experiment is being carried out.
(c) remains constant
(d) keeps decreases then increases.
(3) The melting point of a substance is defined as the constant temperature at atmospheric pressure when:
(a) both the solid & liquid exist together.
(b) the solid start melting
(c) the solid is completely changed into a liquid.
(d) only liquid is present.
(4) Almirah is solid because:
(a) It is hard and rigid.
(b) Its shape doesn’t change when pressed.
(c) Its density is very high.
Which is the correct reason?
(a) (a), (b) and (c)
(b) (c)
(c) (a)
(d) (b)
(5) Which is the two statements is true
Statement A: Petrol, ether, acetone, water, CCl4 are volatile liquid
Statement B: Naphthalene, Camphor, iodine, NH4CL undergo sublimation.
(a) Neither statement A or B
(b) Statement A
(c) Both statement A and B
(d) Statement B
(6) Assertation (A): During evaporation of liquids, the temperature remains unaffected.
Reason (R): Kinetic energy of the molecules is inversely proportional to absolute temperature.
(a) Both A and R are true and R is the correct
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
(7) Assertion (A): Gaseous state of ammonia is not regarded as vapours.
Reason (R): As the volume of a substance increases, its density increases.
(a) Both A and R are true and R is the correct
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
(8) Assertion (A): The diffusion rate of oxygen is smaller than nitrogen.
Reason (R): Molecular size of nitrogen is smaller than oxygen.
(a) Both A and R are true and R is the correct
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
(9) Assertion (A): Ice floats on the surface of water.
Reason (R): The density of both water and ice is same.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
(10) Assertion (A): Solids have fixed shape but rubber band being solid can change its shape.
Reason (R): When force is applied, then the rubber band changes its shape and regain its shape.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Question no 11 to 15 are based on the given text. Read the text carefully and answer the following:
Matter around us exists in three different states – solid, liquid and gas. These states of matter arise due to the variation in the characteristics of the practices of matter. Solids have a tendency to maintain their shape when subjected to outside force. Solids may break under force but it is difficult to change their shape, so they are rigid. The difference in various states of matter is due to the difference in the distances between the constituent particles. Pressure and temperature determine the state of substance, whether it will be solid, liquid or gas.
(11) Which of the following is/are the characteristic/s of solid?
(a) Fixed volumes
(b) Distinct boundaries
(c) Have a definite shape
(d) All of these
(12) Applying pressure and reducing temperature can ____ gases.
(a) None of these.
(b) Both (a) and (b)
(c) Liquefy
(d) Solidify
(13) Gas is converted to a liquid by:
(a) Condensation
(b) Vaporization
(c) Sublimation
(d) Fusion
(14) Solid CO2 gets converted directly to a gaseous state on _____ of pressure
(a) may increase or decrease
(b) decrease
(c) increase
(d) none of these
(15) Solid is converted to a liquid by:
(a) Condensation
(b) Sublimation
(c) Vaporization
(d) fusion
Is Matter Around Us Pure
(1) To prepare a colloidal solution of starch, we should:
(a) add the thin paste of starch to hot water with string
(b) add starch powder to cold water and boil
(c) add the starch powder to boiling water and cool
(d) heat starch, add it to cold water and then bring it to boil
(2) Which of the following statements are incorrect
(a) The properties of a compound are different from its constituents elements
(b) A mixture is homogenous but a compound is heterogeneous
(c) Formation of a compound is a chemical change
(d) Formation of a mixture is a chemical change
(a) (b) and (d)
(b) (a), (b) and (c)
(c) All of these
(d) (a) and (b)
(3) Match the Pair:
Column I |
Column II |
(1) Common salt from seawater |
(a) Gel |
(2) Suspension |
(b) Evaporation |
(3) Brass |
(c) Centrifugation |
(4) Cream from milk |
(d) Solid in a solid mixture |
(5) Liquid in solid |
(e) Heterogeneous |
(a) 1 (C), 2 (A), 3 (D), 4 (B), 5 (E)
(b) 1 (A), 2 (D), 3 (C), 4 (E), 5 (B)
(c) 1 (D), 2 (B), 3 (A), 4 (E), 5 (C)
(d) 1 (B), 2 (E), 3 (D), 4 (C), 5 (A)
(4) Which of the following statements are true for pure substances?
(a) Pure Substances contain only one kind of Particles
(b) Pure substances may be compounds or mixtures
(c) Pure substances have the same composition throughout
(d) Pure substances can be exempli fied by all elements other than nickel
(a) (i) and (iii)
(b) (iii) and (iv)
(c) (ii) and (iii)
(d) (i) and (ii)
(5) Which of the following are physical changes?
(i) Melting of iron metal
(ii) Rusting of iron
(iii) Bending of an iron rod
(iv) Drawing a wire of iron metal
(a) (i), (ii) and (iii)
(b) (ii), (iii) and (iv)
(c) (i), (ii) and (iv)
(d) (i), (iii) and (iv)
(6) Assertion (A): A solution of table salt in a glass of water is homogeneous.
Reason (R): A Solution having different composition throughout is homogeneous.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
(7) Assertion (A): The gas obtained by group I is hydrogen, it is not advised to do the combustion test for hydrogen.
Reason (R): The material obtained by group I is a mixture of the two substances. The substances given are the elements: iron and Sulphur.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
(8) Assertion (A): Tyndall effect is an optical Property.
Reason (R): Electrophoresis is an electrical property.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
(9) Assertion (A): Pragya tested the solubility of 3 different substances at different temperatures. She noted at 313K 62g potassium Nitrate dissolved in 100g of water.
Reason (R): To produce a saturated solution of potassium nitrate in 50g of water of potassium nitrate needed.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
(10) Assertion (A): When a beam of light is passed through a colloidal solution placed in a dark place the path of the beam becomes visible.
Reason (R): Light gets scattered by the colloidal particles.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Question no 11 to 15 is based on the given text. Answer the following after reading the text carefully
Mixture are constituted by more than one kind of pure form of matter. Sodium chloride is itself a pure substance matter. The solution is a homogeneous mixture of two or more substances. Lemonade, soda water etc. are all examples of solutions. Alloys are mixtures of two or more metals or a metal and a non – metal and cannot be separated in their components by physical methods. A solution has a solvent and a solute as its components. The component of the solution that dissolves the other component in it (usually the component present in a larger amount) is called the solvent. The component of the solution that is dissolved in the solvent.
(usually present in lesser quantity) is called the solute.
(11) In a water – sugar solution:
(a) Water is solute and water is also solvent
(b) Water is solvent and sugar is solute
(c) Water is solute and sugar is solvent
(d) none of these
(12) The particles of a solution are smaller than:
(a) 10 nm in diameter
(b) 1 nm in diameter
(c) 6 nm in diameter
(d) 5 nm in diameter
(13) Which of the following statements are true for pure substances?
(a) Pure substances may be compounds or mixtures.
(b) Pure substances have different compositions throughout.
(c) Pure substances can be exemplified by all elements other than nickel.
(d) Pure substances contain only one kind of particle.
(14) Brass is a mixture of:
(a) 30% Zinc and 40% copper
(b) 30% Zinc and 70% copper
(c) 60% Zinc and 70% Copper
(d) 70% Zinc and 50% Copper
(15) Tincture of iodine solution is made by dissolving:
(a) iodine in alcohol
(b) iodine in water
(c) iodine in potassium iodide
(d) iodine in Vaseline
Tissues
(1) Identify and name P, Q, R, S, T and U.
(2) Apart from the one mentioned in the above dichotomous key, name a different part of the animal body where R can be found as a lining.
(3) Draw a well labeled diagram of Q.
(c)
(i) Identify this tissue.
(ii) Infer the characteristic features of these cells.
(iii) Specify the function of this tissue.
(iv) Name any one part of the plant where these cells are present.
Motion
(1) If a car is traveling north on a straight road and its brakes are applied, it will (a) have no acceleration (b) accelerate to the south (c) accelerate to the north (d) accelerate either east or west
(2) A quantity has a value of -6 0./ m s. It may be the (a) speed of a particle (b) velocity of a particle (c) position of a particle (d) displacement of a particle.
Direction: In each of the following questions, a statement of Assertion is given and a corresponding statement of Reason is given just below it. Of the statements, given below, mark the correct answer as:
(a) Both assertion and reason are true and reason is the correct explanation of assertion.
(b) Both assertion and reason are true but reason is not the correct explanation of assertion.
(c) Assertion is true but reason is false.
(d) Both Assertion and Reason are false.
(3) Assertion: the speedometer of a car measures the instantaneous speed of the car.
Reason: Average speed is equal to the total distance covered by an object divided by the total time taken.
(4) Assertion: An object may have acceleration even if it is moving with uniform velocity.
Reason: An object may be moving with uniform velocity but it may be changing its direction of motion.
(5) What is the net displacement of the car?
(A) 20 km
(B) 30 km
(C) 50 km
(D) 70 km
(6) What is the total distance travelled by the car?
(7) Calculate the average speed of the bus?
Force And Laws Of Motion:
(1) Why action and reaction do not cancel each other?
(2) It is required to increase the velocity of a body of mass 80kg from 5m/s to 25m/s in 2s. Calculate the force required.
(3) How long should a force of 100N act on a stationary body of mass 20kg so that it acquires a velocity of 100m/s?
(4) Why do we tend to get thrown to one side when a motorcar makes a sharp turn at high speed?
(5) Assertion: The forces of action and reaction always appear due to actual physical contact of two bodies.
Reason: A particle can move only under the action of a force.
(6) Assertion: A table cloth cannot be pulled from a table without dislodging the dishes.
Reason: Newton’s second law of motion gives the definition of inertia.
(7) What amount of force does the man exert on each box? Show the calculation.
(8) Is the force acting on each box unbalanced? Explain your answer.
(9) Which of these represent a balanced force?
(A) A boy sitting on a chair
(B) An object sinking in water
(C) An apple falling from a tree
(D) A magnet attracting an iron nail
Gravitation:
(1) Newton’s law of gravitation is valid
(a) on the earth only
(b) on the moon only
(c) in the laboratory only
(d) everywhere
(2) The value of G was first determined experimentally by
(a) Newton
(b) Henry Cavendish
(c) Kepler
(d) Galileo
(3) In Newton’s Law of Gravitation, what does G stands for? What is its numerical value?
(4) Assertion: Universal gravitational constant G is a scalar quantity.
Reason: The value of G is the same throughout the universe.
(5) Which pair of objects will have the strongest force of gravity between them?
(6) Calculate the force of attraction between 2 blocks, each of mass 40kg, which are 1m apart.
(7) How does the force of gravitation between two objects change when the distance between them is reduced to one-fourth?
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