Test Paper Chapter 14, NATURAL RESOURCES
Q1. Why is the atmosphere essential for life?
Q2. Why is water essential for life?
Q3. How are living organisms dependent on the soil? Are organisms that live in water
totally independent of soil as a resource?
Q4. You have seen weather reports on television and in news paper. How do you think
we are able to predict the weather?
Q5. We know that many human activities lead to increasing levels of pollution of air,
water bodies and soil. Do you think that isolating these activities to specific and limited
areas would help in reducing pollution?
Q6. Write a note on how forests influence the air, soil and water resources.
Q7. What is ‘Water Cycle’ ? Explain the process of water cycle.
Q8. Write a short note on ‘Nitrogen Fixation’
Q9.Explain the ‘Nitrogen Cycle
Q10. Discuss the consequences of the increase in the concentration of Carbon dioxide and other Green House gases in the atmosphere
CBSE Summative & Formative Assignment based on CCE Test Paper Biology Term-2
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IX Atomic Structure ( a fundamental particles) Discovery of Electron
9th Atomic Structure (Discovery of a fundamental particle protons)
9th Atoms and Molecules
9th Structure of Atoms
Practice paper and sample paper based On Atomic structure
Rutherford Experiment and Discovery of Nucleus
Lord Rutherford (1911) and his coworkers performed an experiment. They bombarded a very thin, gold fail with Alpha particles from a radioactive source. They observed that most of the particles passed straight through the foil undeflected. But a few particles were deflected at different angles. One out of 4000 Alpha particles was deflected at an angle greater than 150.
Following conclusions were drawn from the Rutherford’s Alpha Particles scattering experiment.
1. The fact that majority of the particles went through the foil undeflected shows that most of the space occupied by an atom is empty.
2. The deflection of a few particles over a wide angle of 150 degrees shows that these particles strike with heavy body having positive charge.
3. The heavy positively charged central part of the atom is called nucleus.
4. Nearly all of the mass of atom is concentrated in the nucleus.
5. The size of the nucleus is very small as compared with the size of atom.
Defects of Rutherford Model
Rutherford model of an atom resembles our solar system. It has following defects:
1. According to classical electromagnetic theory, electron being charged body will emit energy continuously. Thus the orbit of the revolving electron becomes smaller and smaller until it would fall into the nucleus and atomic structure would collapse.
2. If revolving electron emits energy continuously then there should be a continuous spectrum but a line spectrum is obtained.
Bohr’s Atomic Model
Neil Bohr (1913) presented a model of atom which has removed the defects of Rutherford Model. This model was developed for hydrogen atom which has only proton in the nucleus and one electron is revolving around it.
Postulates of Bohr’s Atomic Model
The main postulates of Bohr’s Model are given below:
1. Electrons revolve around the nucleus in a fixed orbit.
2. As long as electron revolves in a fixed orbit it does not emit and absorb energy. Hence energy of electron remains constant.
3. The orbit nearest to the nucleus is the first orbit and has lowest energy. When an electron absorbs energy it jumps from lower energy orbit to higher energy orbit. Energy is emitted in the form of radiations, when an electron jumps from higher energy orbit to lower energy orbit. The unit of energy emitted in the form of radiations is called quantum. It explains the formation of atomic spectrum.
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Structure of atom for CBSE class 9(IX)
Solved Summative Assessment Paper
Solved some important questions for coming CBSE Exam
How was the neutron discovered?
How was the proton discovered?
How was the Electron discovered?
Extra mark’s Notes, "Atomic Structure"
How was the Nucleus discovered?
Structure of an Atom IX Chemistry assignment-1
Structure of an Atom IX Chemistry assignment-2
X Periodic Classification of Elements : How can we find groups and period of elements by atomic number
How to identify the group and period of element ?
Electronic configuration is the arrangement of electrons in an atom in different shells and sub-shells. The modern periodic table has elements arranged according to their electronic configurations.From left to right i.e. in a period,the arrangment is such that each subsequent electron added is to the same shell.
Electronic Configuration is the Period
e.g Configuration of Li atomic number. 3, is 1s2 ,2s1
Configuration of Be atomic no. 4, is 1s2 ,2s2
Configuration of B atomic no. 5, is 1s2 ,2s2,2p1
Configuration of C atomic no. 6, is 1s2 ,2s2 ,2p2
and so on till Neon,the last element.
This addition of each subsequent electron results in a completely new configuration and as such the chemical properties of the subsequent element change gradually..At the end of each row, a drastic shift occurs in chemical properties.
Electronic Configuration is the Group
From top to down in a column,i.e.in a group, each subsequent electron is added to the new shell,but in same sub-shell.
e.g. In the 1st group,
Configuration of H atomic number.1,is 1s1
Configuration of Li atomic no. 3, is 1s2 ,2s1
Configuration of Na atomic no. 11, is 1s2 ,s2,2p6 ,3s1
Configuration of K atomic no. 19, is 1s2 ,2s2 ,2p6,3s2 ,3p6,4s1
and so on till Neon,the last element.
The number of valence shell electrons in an atom would determine the way it will interact with other atoms, and therefore determine its chemical properties.
Further study visit10th Periodic Classification of Elements (10 pages)
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JSUNIL TUTORIAL, SAMASTIPUR 10TH CARBON AND COMPOUND MCQ
Q1. Which of the following is not a saturated hydrocarbon ?
i) Cyclohexane. ii) Benzene.
iii) Butane iv) isobutene
Q2.The bond between two identical non metallic atom has a pair of electron ?
i) unequally shared between two atoms.
ii) Transferred completely from one atom to another.
iii) With identical spins
iv) Unequally shared between them.
Q3. Covalent compounds are generally
i) Soluble in water ii) Insoluble in water
iii) Ionize in water iv) Hydrolyse in water
Q4. Propane with the molecular formula C3H8 has
i)7covalent bonds ii)8 covalent bonds
iii)9 covalent bonds iv) 10 Covalent bonds.
Q5. A hydrocarbon reacts with ammonical cuprous chloride solution to form a red precipitate .
The hydrocarbon is
Q6.Which of the following substance is added to denature Ethanol ?
iii)copper sulphate iv)all of them
Q7. Which of the following is not an allotropic form of carbon
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Child development and Pedagogy
1. To prevent the misuse of alcohol which poisonous substance is added in it?
2. Which Substance is used as pickles preservative?
(b.) Acetic acid
(d.) Ethanoic acid
3. Carboxylic acids are called.
(a.) Inorganic Compound
(b.) Organic Compound
(c.) Hydrocarbon Compound
(d.) Acetic acid
4. In modern periodic table how many columns are vertically arranged?
5.In what way Mendeleev's published his periodic table.
6.In an experiment to determine the focal length of a convex lens, a student obtained a sharp inverted image of distant tree on the screen behind the lens. He / She then removed the screen and looked through the lens in the direction of object. She / He will see. -
(a.) An inverted image of tree at focus of lens.
(b.) No Image as the screen has been removed
(c.) A blurred image on the wall of laboratory
(d.) An erect image of the tree on the tree on the lens
7. For doing experiment on verifying the Causes of reflection of sound. A student sets up his apparatus as shown. The experiment is more likely is get performed successfully if the screen shown is
(a.) Well polished plane mirror
(b.) Wooden board with many holes in it
(c.) A foam padded board
(d.) A sheet of pure white cloth
8. The focal length of a concave mirror depends on it.
(b.) Radius of curvature
(d.) Center of curvature
9.The diameter of the reflecting surface of spherical mirror is called.
(a.) Focal length
(b.) Radius of curvature
(d.) Principal focus
10. To form complete image of the object height of the mirror is.
(c.) One – Fourth
(d.) Same size as object
11. The magnification of plane mirror is(a.) -1
12. . What is catenation ?
13. Name the structure of diamond and graphite?
14. Which organic compound made in laboratory. By whom and when?
15. Name that inorganic compound by which organic compound is formed also write their formula.
16. Why carbon atoms always form covalent bond?
17. Name two elements which shows catenation but they are unstable?
18. Why kitone group can never occur at the end of carbon chain?
19. Why do substances burn with flame? Name their types?
20. Why mixture of acetylene and air is not used for welding?
21. People use a variety of methods to wash cloths. Usually after adding the shop, they beat the cloths on a stone or beat it with a paddle, scruib with a brush or mixture is agitated in a washing machine. Why is agitation necessary to get clean clothes?
22. Besides gallium, which other elements have since been discovered that were left by Mendeleev in his periodic table?
23. Explained why stars twinkle but why plants do not twinkle?
24. Why do we have two eyes for vision and not just one?
25. When and by whom dispersion of light experimentally discovered?
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GENERAL INSTRUCTIONS :
1. All questions are compulsory.
2. The question paper consists of 34 questions divided into four sections, namely
Section A : 10 questions (1 mark each)
Section B : 8 questions (2 marks each)
Section C : 10 questions (3 marks each)
Section D : 6 questions (4 marks each)
3. There is no overall choice. However, internal choice has been provided in 1 question of two marks, 3 questions of three marks and 2 questions of four marks each.
4. Use of calculators is not allowed.
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