# CBSE Class 9 Science Revision Worksheet Set I

Read and download free pdf of CBSE Class 9 Science Revision Worksheet Set I. Students and teachers of Class 9 Science can get free printable Worksheets for Class 9 Science in PDF format prepared as per the latest syllabus and examination pattern in your schools. Standard 9 students should practice questions and answers given here for Science in Grade 9 which will help them to improve your knowledge of all important chapters and its topics. Students should also download free pdf of Class 9 Science Worksheets prepared by school teachers as per the latest NCERT, CBSE, KVS books and syllabus issued this academic year and solve important problems provided here with solutions on daily basis to get more score in school exams and tests

## Science Worksheet for Class 9

Class 9 Science students should refer to the following printable worksheet in Pdf in standard 9. This test paper with questions and answers for Grade 9 Science will be very useful for exams and help you to score good marks

### Class 9 Science Worksheet Pdf

CBSE Class 9 Science Worksheet (3). Revision worksheets, Sample papers, Question banks and easy to learn study notes for all classes and subjects based on CBSE and CCE guidelines. Students and parents can download free a collection of all study material issued by various best schools in India. The study material has been carefully compiled by the best teachers in India. The students should practice the questions database to get better marks in examination. Please refer to other links for free download of high quality study material. Based on CBSE and CCE guidelines. Based on the same pattern as released by CBSE every year. Study material for final/ term/ SA1/ SA2 Examinations conducted by various schools affiliated to Central Board of Secondary Education (CBSE) in India and abroad. CBSE Study material has been compiled to help students preparation which will helps the students to concentrate more in areas which carry more marks.

SCIENCE (Practice worksheet)

Class – 9th

Term 2 (2013‐14)

PHYSICS

Q1. Describe Thrust. Write its SI unit.

Q2. A block of mass m is raised from position A to B by taking two different parts as shown. Let the height AB = h. Answer the following questions.

a) What is the work done on the block in Fig 1 and Fig 2.

b) Name the energy possessed by the block at position B in both the cases.

Q3.

a) An electric heater is rated 200 W. How much energy does it use in 5 hours.

b) Establish the relation between the commercial unit and SI unit of energy.

Q4. Give an example each of the following energy transformation

a) Heat energy into Mechanical energy.

b) Mechanical energy into Electric energy.

Q5. The kinetic energy of an object moving with a velocity of 5 m/s is 25 J. Find the mass of the object. What will be its kinetic energy when its velocity is 2 times? Justify your answer.

Q6. What is meant by power of machine from a 20 m high fall nearly 25 Metric tonnes of water fall per second. Calculate the equivalent power if all this energy is utilised? (g = 10m/s2)

Q7. State the meaning of 1 Pascal. A boy of mass 40 kg is standing on loose sand, if the area of his Feet is 0.04 m2. Calculate the pressure exerted by the boy.

Q8. Distinguish between positive and negative work. When you lift an object, two forces act on it. Identify these forces.

Q9. State the difference between density and relative density.

Q10. Define the following terms. State its SI unit.

a) Wavelength b) Time period c) Amplitude.

CHEMISTRY

Q1. Water molecule has hydrogen and oxygen in the ratio of 1: 8 by mass. Find the ratio number of atoms in the molecule.

Q2.

a) Draw a diagram showing the observations made by Rutherford in alpha particles scattering experiments .

b) Why did Rutherford use a gold foil the experiment mentioned in part (a) ?

c) List three conclusions drawn by Rutherford from his experiment. State three features of nuclearmodel of an atom put forward by Rutherford.

Q3.

a) State the limitations of J.J. Thomson’s model of an atom.

b) Define valency by taking the examples of magnesium ( At. No: 12) and oxygen (At. No : 8).

c) Describe Bohr’s model of atom.

Q4.

a)Calculate the number of particles in each of the following :

i) 46 g of Na atoms

ii) 8 g of O2 molecule

iii) 0.1 mole of carbon atoms.

b) Convert following into mole :

i) 12 g of O2 gas ii) 20 g of water iii) 22 g of CO2

Q5.

a) Give the relationship between mole, mass and Avogadro’s number.

b) Write the chemical formula of the following compounds :

i) Hydrogen nitride ii) Hydrogen peroxide iii) Hydrogen carbide

iv) Calcium fluoride v) Iron (II) bromide vi) Silver Iodide

vii) Ammonium carbonate viii) Barium sulphate ix) Calcium phosphate

Q6.

a) Calculate the molecular masses of the following compounds :

i) Acetic acid (CH3COOH) ii) Ethanol (C2H5OH) iii) Carbon dioxide

b) Calculate the mass of the following :

i) 0.5 mole of N2 gas(mass from mole of molecule)

ii) 0.5 mole of N atoms ( mass from mole of atom)

Please refer to attached file for CBSE Class 9 Science Worksheet (3)