# CBSE Class 9 Science Solved Practice Paper SA ‒ I: Set VII

Sep 6, 2016 16:00 IST

Jagranjosh presents CBSE Class 9th Science Solved Practice Paper for SA – I for the academic session 2016-17. This solved practice paper is specially prepared at jagranjosh.com after the brief analysis of previous year SA ‒ I question papers.

About CBSE Science Solved Practice Paper for SA – I: 2016-17

Most of the schools set CBSE Class 9th Science SA – I papers as per the examination pattern issued by CBSE board. However, level of questions in the question paper varies from school to school. Despite the variations in level of questions asked in the question papers set by different CBSE schools, there are some common questions which are asked in various schools frequently.

This solved practice paper gives you an idea of such types of questions. All the questions in practice paper are provided with detailed explanation.

CBSE Class 9 NCERT Solutions

Importance of CBSE Class 9th Solved Practice Paper 2016 -2017:

This Science SA – 1 solved practice paper is set as per the latest CBSE exam pattern. The questions asked in this paper will give you a fair idea of the important topics to be studied for SA-I: 2016-17 and help you score optimum.

Unique solutions to all the questions are provided. These solutions will give you a clear idea about what and how much must be written in the Class 9th Science SA – I examination 2016 – 17 to fetch you the maximum score.

CBSE Class 9 Video Tutorials

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 – I Science exam

• know how to give proper explanations of the questions

CBSE Class 9 Syllabus 2016 - 2017

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

Q. Why Evaporation always occur at the surface?

Solution:

When a liquid is heated, the molecules at the surface of the liquid gains kinetic energy and leaves the surface whereas, the molecules at the bottom first gain kinetic energy to reach the surface of liquid. Therefore, evaporation always occurs at the surface.

Q. What is SI unit of rate of change of momentum?

Solution:

The rate of change of momentum of an object is directly proportional to the applied force. Therefore, SI unit of rate of change of momentum is Newton or Kg m s-1.

Q. Explain one function of each

(i) Mitochondria

(ii) Chloroplast

Solution:

(i) Mitochondria: The primary function of mitochondria is to perform cellular respiration.

(ii) Chloroplast: The main function of chloroplasts is to convert sunlight, water and carbon dioxide into food for the plant.

Q. What is Newton's third law of motion? Explain why a fireman can’t hold the hose ejecting water easily.

Solution:

According to the Newton’s third law, every action has equal and opposite reaction and action and reaction act on different bodies.
When a fireman holds a hose, which is ejecting large amounts of water at a high velocity, then a reaction force is exerted on him by the ejecting water in the backward direction.  As a result of the backward force, a fireman can’t hold the hose ejecting water easily.

Q. (i) Where green chlorophyll is present in a plant cell?

(ii) Write the name of any two cell organelles which are bounded by double membranes?

(iii) Mitochondria called semiautonomous organelles. Explain.

Solution:

(i) Chlorophyll molecules are contained inside chloroplasts.

(ii) Chloroplasts and mitochondria are double membrane bound organelles.

(iii) Chloroplast and mitochondria are called semi-autonomous organelles because they have their own genetic material (DNA) and are capable of synthesizing proteins required for their functioning.

Q. (i) What is the term used for the scientific management of livestock?

(ii) What do you mean by the terms Apiary and Pasturage?

(iii) Mention two desired traits for which the cross breeding of cattle is done.

Solution:

(i) Animal husbandry

(ii) Apiary: The farms where bee-hives are kept for the commercial production of honey are called apiaries. Pasturage: The regions where flowers are available to the bees for nectar and pollen collection is called pasturage.

(iii) The cross-breeding programme between Indian and foreign breeds are focussed on the following desirable traits:

•    Number and quality of chicks.

•    Low maintenance requirements.

Q. Force of friction is independent of:

(a) weight of the object

(b) roughness of surface

(c) area of contact

(d) all of these

Solution:

(c)

Force of friction is independent of area of contact.

Q. With the help of a barometer, one can measure

(a) atmospheric pressure

(b) temperature

(c) refractive index

(d) pressure

Solution:

(a)

A barometer is a scientific instrument used in meteorology to measure atmospheric pressure.

Q. From the following options select the largest cell which is present in human body

(a) Brain cell

(b) Skin cell

(c) Nerve cell

(d) Eye ball

Solution:

(c)

Longest cell in human body is nerve cell.

Q. When a human cheek cells are observed under a microscope with a lower magnifying setting then

(a) more cells in a brighter field of view are observed

(b) less cells in a brighter field of view are observed

(c) more cells in a darker field of view

(d) none of these

Solution:

(a)

When a human cheek cells are observed under a microscope with a lower magnifying setting then more cells in brighter field of view are observed.

Q. The colloidal solution, in which both the dispersed phase and the dispersion medium are liquids, is:

(a) milk

(b) cheese

(c) butter

(d) ghee

Solution:

(a)

Milk is a colloidal solution in which both dispersed phase and dispersed medium are in liquid state.

Q. Hariom washed a 1 kg arhar dal in water. The water became yellow. He then took this water in a test tube and added a few drops of HCI to the same test tube, the water turned pink in colour. From the above test he concluded that arhar dal contains:

(a) protein

(b) calcium

(c) rice

(d) metanil yellow

Solution:

(d)

The above test shows that arhar dal contains metanil yellow.

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