NCERT Syllabus for Class 12TH Science

CBSE Class 9 Science important 3 and 5 marks questions

9th Class CBSE


CBSE Class 9 Science important 3 and 5 marks questions

CBSE Class 9 Science important 3 and 5 marks questions: Below article Focuses on various important 3 and 5 marks questions for class 9th science CBSE students for the final preparation of board examination. Questions are more preferable for the advanced preparation for the exam.

All the below questions updated by our experienced faculty and an experienced team for providing you the best preparation for your final board examination. The below articles contains all the  3 and 5 marks important questions which are mostly and have maximum chances for asking in the examination.

So go through the below article for the most important  3 and 5 marks questions for class 9th science.


CBSE Class 9 Science important 3 marks questions

Question 1. (a) Draw a sketch of Bohr’s model of an atom with three shells.

(b) If K and L shell of an atom are full, then what would be the total number of electrons in the atom?

Question 2. What is role of tissues present in multi-cellular organisms? (3 Marks)

Question 3. Give reasons for the following :

(a) Ice though being a solid floats on water.

(b) A gas fills completely the vessel in which it is kept ?

(c) Rate of evaporation of an aqueous solution decreases with increase in humidityQuestion 4. (a) Name two properties of a substance to check its purity?

(b) Alloys cannot be separated by physical means, though it is considered mixture, Why?

Question 5. When we open the cap of a cola drink (or any carbonated beverage), why does excess of bubbles come out?


Question 6. Give reasons for the followng:

(i) A liquid generally flows easily

(ii) Ice at 0o appears colder to the mouth than water at 0°C. Why?

(iii) Doctors advise to put strips of wet cloth on the forehead of a person having high temperature.

Question 7. (a) Who discovered vaccine for the first time?

(b) What is an antibiotic? Give two examples.

Question 8. Why air is a mixture not a compound? Give reasons.

Question 9. Calculate the mass of glucose and mass of water required to make 200g of 25% solution of glucouse.

Question 10. How crystallization is better than evaporation?

Question11. Give three examples of the range of variations that you see in life forms around you.

Question12. When a bullet is fired from a rifle its momentum become 20 kg m/s. If the velocity of the bullet is 1000m/s what will be its mass?

Question13. Is it possible that an object is in the state of accelerated motion due to external force acting on it, but no work is being done by the force. Explain it with an example.

Question14. What do you mean by active and passive immunisation ?

Question15. (a) Explain the formation of acid rain.

(b) What does the presence of smog in an area indicate?

CBSE Class 9 Science important 5 marks questions

Question 1.  (a) Which method will you use to separate : (i) components of air (ii) acetone and water? Explain each.

(b) What is the difference in the apparatus used for distillation and fractional distillation?

Question 2. (a) List any four properties of a colloid and mention any two properties in which colloids differ from suspension.

(b) State what is Tyndall effect ? Which of the following solutions will show Tyndall effect ? Starch solution, sodium chloride solution, Tincture iodine, air

Question 3. Give reasons for the following:

(a) It is difficult to balance our body, when we accidentally step on a peel of a banana.

(b) Pieces of bursting cracker fall in all possible directions.

(c) A glass pane of a window is shattered, when a flying pebble hits it.

(d) It is easier to stop a tennis ball than a cricket ball moving at the same speed.

(e) Javelin thrower is marked foul, if an athlete crosses over the line marked for the throw. Athletes often fail to stop themselves before the line.

Question 4. (a) What is transformation of energy? Explain with any two suitable examples.

(b) What must be the velocity of a moving body of mass 2kg so that its KE is 25J?

(c) Represent graphically a constant force acting on a body producing a displmement along the direction of motion on a force-displacement graph. What is the significance of force-displacement graph?

Question 5. (a) What is immunisation ?

(b) Define immunity and vaccination.

(c) Define vaccine.

(d) What type of diseases can be prevented through vaccination?

Question 6. (a) Define

(i) Vector

(ii) Carrier

(b) What are the modes of transmission of AIDS?

Question 7. (a) (i) Why denitrification of nitrogenous compounds is necessary?

(ii) What is the special structure found in legumes and what is its function

(b) What is biomass?

(c) What is humification? why it is important?

Question 8. (a) Oxygen has three isotopes of atomic masses 16, 17 and 18 respectively. Explain the following:

(i) They have same chemical properties.

(ii) They are all electrically neutral.

(b) Name the isotopes ot hydrogen.

(c) Give one point of similarity and one point of difference between isotopes 146C and 126C?

Question 9. (a) Write the rules followed for filling the electrons in various energy shells of any atom, as proposed by Bohr and Bury.

(b) Write the electronic configuration of an atom of sulphur. Also draw a schematic diagram of its atom showing the distribution of electrons in its shells.

(c) State the law of constant Proportion ith the help of an example.

Question 10. (a) Why are angiosperms so called ? In which structures do the seeds develop ? How are angiosperms different from gymnosperms ?

(b) Give an appropriate term for each of the following:

(i) Complex sugar that makes the fungal cell wall.

(ii) Plants which bear naked seeds.

(iii) Basic unit of classification.

(iv) Group of unicellular eukaryotic organism.

Question 11. (a) Write any four characteristics exhibited by a pure substance?

(b) What happen to sugar when it is dissolved in water? Where does the sugar go? What information do you get about the nature of matter from the this solution of sugar in water.

Question 12. Give reasons for the following statements:

(a) Meristematic cells have a prominent nucleus and dense cytoplasm but they lack vacuole.

(b) Intercellular spaces are absent in sclerenchymatous tissues.

(c) We get a crunchy and granular feeling, when we chew pear fruit.

(d) Branches of a tree move and bend freely in high wind velocity.

(e) It Is difficult to pull out the husk of a coconut tree.


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