CBSE Class 9th Science Solved Practice Paper 2015

Jagranjosh presents CBSE Class 9th Science Solved Practice Paper for summative Assessment-II. This solved practice paper has been prepared by the Jagranjosh experts after the brief analysis of previous year SA ‒ II question papers. The paper contains important questions based on the concepts likely to be asked in SA-II. All the questions are provided with appropriate solutions. These solutions will give you a clear idea about what and how much must be written in the Class 9th Science SA – II examination in order to fetch you the maximum score.

After going through this solved practice paper you will:

• understand the latest examination pattern

• learn time management

• know important questions likely to be asked in SA – II Science exam

• know how to give proper explanations to for each question

Some of the sample questions from the solved practice paper are:

Q. A man weighing 75 kg carrying a load of 100 N in his hands is standing on the road side. Calculate the work done in this case.

Solution: As we know that the work is said to be done only when a force produces motion. Since here in this case the suitcase carried by the man does not move at all, so the work done by the man is zero.

Q. What is the atomicity of (a) H₂SO₄ and (B) Na₂CO₃?

Solution:

(a) Atomicity of H₂SO₄ is seven.
(b) Atomicity of Na₂CO₃ is 6.

Q. What are angiosperms? Write its two characteristics.

Solution: Angiosperms comprises a group of the flowering plants that has the main characteristics of having flowers and produce seeds enclosed within a carpel.

Two characteristics of angiosperms are:

(i) The root system of the angiosperms is very complex and contains and contains the conductive tissues like cortex, phloem, xylem etc.

(ii) The reproductive organs are aggregated in their flowers

Q. (a) What do you mean by the term buoyant force?
(b) If a fresh egg is put into a beaker filled with water, it sinks. But if you dissolve a lot of salt in water, the egg begins to rise and then starts floating. Why?

Solution:
(a) Buoyant force: The upward force acting on an object immersed in a liquid is called the buoyant force that increases with the increasing depth of the object in the liquid and density of the liquid.
(b) When a lot of salt is dissolved in water, then the density of salt solution becomes much higher than pure water. Due to its much higher density, the salt solution exerts a greater upward buoyant force on the egg making it rise and then float in water.
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