Important 2 marks questions for Class 9 Science

Class 9 is considered as one of the most crucial stages in a student’s academic career. The topics and the concepts that are taught in class 9 are very important for class 10th board exam. So students must study hard in class 9 to score well in the first crucial examination of their life, i.e. CBSE Class 10 board exam.

CBSE short for Central Board of Secondary Education is one of the most preferred educational board in India which is known for its quality of examination and its well-structured question papers. Science is one of the most interesting and scoring subjects in class 9 and 10. The 2 marks questions for CBSE class 9 science are given here to help students prepare better for their exam.

The 2 marks questions are one of the most scoring section in CBSE class 9 science exam if students have a strong conceptual knowledge of the topics. And one of the best ways to be strong in a subject is by solving questions. So we are providing the important 2 marks questions for class 9 science so that students can understand each concept properly and excel in their examination.

The important 2 marks questions for class 9 science is given below.

Question 1- Give one achievement and one limitation of Thomson’s model.

Question 2- (a) Hydrogen and oxygen combine in the ratio of

\(\begin{array}{l}1:8\end{array} \)
by mass to form water. What mass of oxygen gas would be required to react completely with 3 g of hydrogen gas?

(b) Write the molecular formula of a diatomic gas and a triatomic gas.

Question 3- Give any two important application of Archimedes’ principle.

Question 4- What are the two types of natural resources? Define and give examples of each.

Question 5- (a) What is the advantage of classifying organism?

(b) Why some organisms are considered diploblastic?

Question 6- (a) Why are ceilings of concert halls curved?

(b) Can sound waves propagate in vacuum?

Question 7- (a) What is the major reservoir of fresh water?

(b) Name the factors which influence the pattern of wind.

Question 8- (a) Identify any two features possessed by Chordates.

(b) In which class would you place an organism which has:

(i) A scaly exoskeleton and a bony endoskeleton.

(ii) A scaly exoskeleton and lay eggs outside water.

Question 9- Explain the following:

(a) Swimmers are provided with an inflated rubber jacket/tube. Why?

(b) It is easier to swim in a sea water than in river water. Why?

Question 10- In a car lift, a car of 1200 kg mass is resting on a platform of surface area 10

\(\begin{array}{l}m^{2}\end{array} \)
.. What pressure should the platform exert on the car so as to lift it?

Question 11- (a) Write the electronic configuration of element whose atomic numbers are 5 and 7.

(b) Why is an atom considered to be neutral?

Question 12- (a) Name the factors which influence the patterns of winds.

(b) Name any two greenhouse gases.

Question 13- (a) How is gymnosperms and angiosperms differ from each other?

(b) Name the largest phylum which is probably the largest group of animals?

Question 14- (a) What is the advantage of using scientific name instead of common name?

(b) Write any one point of difference between amphibians and aves.

Question 15- What is polyatomic ions? Give two examples.

Question 16- (a) List any two uses of groundwater.

(b) Why is atom considered to be neutral?

Question 17- (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 18- Distinguish between loudness and intensity of sound.

Question 19- What is the mass of ?

(i) 0.2 mole of oxygen atoms?

(ii) 0.5 mole of water molecules?

Question 20- Following observations were taken while determining the relative density of a liquid.

Weight of the solid in air = 0.100 kgf

Weight of the solid in liquid = 0.080 kgf

Weight of the solid in water = 0.075 kgf


(a) the apparent loss in weight of solid in liquid.

(b) the apparent loss in weight of solid in water.

Question 21- List one similarity and one difference between fungi and plant.

Question 22- (a) Give one example of biotic and abiotic components of biosphere.

(b) Define water pollution.

Question 23- (a) How many cotyledons are present in the seeds of monocots and dicots?

Question 24- Flash and thunder are produced simultaneously. But thunder is heard a few seconds after the flash is seen, why? How does the speed of sound in air vary with raise in density of the medium?

Question 25- List any two characteristics of division Pteridophyta that shows they are the most advanced cryptogams.

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