 
9th[IX] Sample papers for Summative Assessment – 1 [links]
Mathematics Science Social Science English, Hindi and Sanskrit
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1) Magnetic fields are produced due to
A. Stationary charges B. Moving charges Ö C. Both a and b D. None of the above 2) 1 Gauss = A. 10⁴ Tesla B. 1000 Tesla C. 10⁻⁴ Tesla Ö D. None of the above 3) The magnetic field density along the axial line of a circular coil carrying current A. Zero B. Constant C. Varies with distance from the center of the coil Ö D. None of the above 4) In magneto statics, the magnetic field generated by a steady current is given by A. Biot-Savart’s Ö B. Law Lenz’s Law C. Faraday’s Law D. Ohm’s Law 5) The magnetic field developed at different points on the axial line of a circular coil is A. Directly proportional to the current Ö B. Inversely proportional to the current C. Independent of the current D. Directly proportional to the square of the current 6) What is the nature of the magnetic field inside current carrying loop? A. randomly in all directions B. all in one directionÖ C. all fields cancel each other (no magnetic field) D. none of the above 7) The functioning of an electric motor is based on A. thermal properties of a wire B. magnetic effect of a permanent magnet C. magnetic effects of currentÖ 8) The loops in the conductor repel each other when current is passed through them. A. depends on the type of current B. (AC/DC) depends on the radius of the loops C. true D. falseÖ 9) Which of the following about a magnetic field is correct? A. The unlike magnetic poles repel. B. A magnetic pole can be isolated. C. The magnetic field lines indicate the direction of force.Ö D. A magnetic pole cannot induce magnetic poles in other materials. 10) Amit attaches one end of a string to a steel paper clip and the other end to a table. The string is very light. He then uses a magnet to attract it so the clip seems to float in air. However, when she lifts the magnet, the paper clip falls. What is the reason for this? A. The potential energy of the clip decreases. B. The gravitational force near the magnet increases. C. The magnetic properties of the clip decreases. D. The magnetic field strength near the clip decreasesÖ 11) A rod P is hung on a string and then another rod Q is brought near it. P and Q attract each other. Which of the following statements is correct? A. P must be a magnetic object. B. Q must be a magnetic object. C. Both P and Q must be magnetic objects. D. It is possible that P and Q both are magnetic objects or only one of them is.Ö 12) A piece of metal can be deduced to become a magnet if A. both ends of a compass needle are attracted to it. B. a magnet is attracted to it. C. one end of a compass needle is repelled by it.Ö D. copper wire is repelled by it. 13) Which of the following statements describes an example of induced magnetism? A. A bar magnet, swinging freely, comes to rest pointing North-South. B. A bar magnet loses its magnetism if it is repeatedly dropped. C. A bar magnet attracts a piece of soft iron.Ö D. It is hard to magnetise steel, but easy to magnetise soft iron. 14) A metal bar X-Y hung by a thread always settles in no definite direction. Another bar P-Q of the same metal always comes to rest with end P pointing North. What is the result if the two bars are brought near one another? A. P attracts X but repels Y. B. P neither attracts nor repels X. C. P attracts X but Q repels Y. D. P and Q both attract X.Ö 15) Which of the following is suitable to be used for the needle of a plotting compass? A. Brass B. Copper C. Iron Download this file in pdf : MCQ based on activity Magnetic effect of current Download File 
Q. What is the atomic number of carbon?
Answer: The atomic number of carbon is 6. Q. What is the distribution of electrons in various shells for carbon? Answer: The distribution of electrons in various shells for carbon: K(2),L(4) Q. How many valence electrons will carbon have? Answer: 4 Q. Why carbon form covalent compound? Answer: carbon form covalent compound because : (i) Carbon cannot gain four electrons forming C4– anion because it would be difficult for the nucleus with six protons to hold on to ten electrons. , that is, four extra electrons. (ii) Carbon cannot lose four electrons forming C 4+ Cation because it requires a large amount of energy to remove four electrons leaving behind a carbon Cation with six protons in its nucleus holding on to just two electrons. Q. Why is carbon tetravalent ? Answer: Carbon atom has 4 electrons in the outermost shell.It needs 4 more electrons to complete its octet. Therefore , carbon is tetravalent . For rest solved questions visit: Wonder family of Carbon and its compound Posts with label 10th Carbon and its Compounds Solved
Central Public School: Samastipur .RESULT
CBSE Result Analysis Applicaton
Free application for generate school result analysis. Forget manual analysis, pave way to computer. # Result Analysis for class XII: www.novicelab.org/cbsera12 # Result Analysis for class X: www.novicelab.org/cbsera10 Formative Checkpoint-01 State true and false 1. Non metals are good conductor of electricity? False, except graphite. Generally metals are good conductor of electricity. 2. Whenever current passes through it causes heating of metal: True 3. The full form of LED is Light Electrical device: False 4. Pure water is bad conductor of electricity: True 5. Tap water conducts electricity through it: True Fill in the blanks: 1. The work done to carry unit charge from infinity to a point in a conductor is called ------. [Electrical potential] 2. SI unit of Electrical potential is ------. [ Volt] 3. The closed conducting path of electric current is called -------. [Electric circuit] 4. ---------- is the work done to carry charge from one end of conductor to other end. [ potential difference] 5. Potential difference is created by using ------- or ---------. [Cell or battery] 6. The rate of the flow of electric charge is called -------. [ Electric current] 7. The direction of electric current is always from ----to ---- terminal of the battery. [Positive, negative] 8. When an electric current flows through a conducting solution, there is change of colour of the solutions. This effect of current is known as --Chemical effect of current] 9. Oxygen bubbles formed on the electrode connected to the ----------- terminal of the battery called anode during electrolysis. [Positive] 10. Hydrogen bubbles formed on the other electrode connected to the ----------- terminal called cathode during electrolysis. [Negative] 11. An electrolyte when dissolve in water produce -----. [Ions] 12. Positively charged ion is called ------. [Cation] 13. Negatively charged ion is called ------. [Anion] 14. Sugar, urea, benzenes Ethyl alcohol are some examples of ------. [Non electrolyte.] 15. During electrolysis Cation gets reduced at -----. [Cathode] and anions gets oxidized at ----- [anode] Download solved paper 8th Science Chapter-14-Chemical Effects Of Current
Class VIII Mathematics [Click on links given below]
VIII Algebra VIII Commercial Maths VIII Geometry & Menstruation CBSE Class VIII Science Physics Chemistry Biology 8th Sample paper 8th Social Science  Check Point-Formative Corner -01 1. What are natural resources? Name any three natural resources? Ans: The material that are gifted by nature for survival is called natural resources like air ,water, soil, sunlight etc. 2. Name an important fossils fuel? Answer: The remain of plants and animals that are died millions of year ago are called fossils. The fuel obtain from fossils of plants and animals are called fossils fuel like Coal, petroleum and natural gas. 3. Name one important use of fossils fuel? Answer: Fossils fuel are main source of getting energy. 4. Is coke better than coal? Ans; yes, this is because coke does not produce smoke but produce more heat than coal on burning. 5. What do you mean by destructive distillation of coal? Or, what happen when coal is heated in absence of oxygen? Answer: The process of heating coal in absence of oxygen at 1000 deg. C to 1400 deg C is called destructive distillation. We get coke, coal gas coal tar and ammoniacal liquor by destructive distillation of coal. 6. What is the composition of coal? Answer: Coal is a mixture of carbon, hydrogen, oxygen, nitrogen and sulpher. 7. Write some uses of coal? Answer: Coal is used (a) As fuel to coke food (b) To generate energy in thermal power plant (c) as a source of Download full pdf file
5. Coal Petroleum, Natural Gases see full downloadable file
Class VIII Mathematics [Click on links given below] VIII Algebra VIII Commercial Maths VIII Geometry & Menstruation CBSE Class VIII Science Physics Chemistry Biology 8th Sample paper 8th Social Science 10th Triangle (Similarity) : Problems and solution to excel in exam
Similar figures: “Two similar figures have the same shape but not necessarily the same sizes are called similar figures. “ This verifies that congruent figures are similar but the similar figures need not be congruent. Conditions for similarity of polygon: Two polygons of the same number of sides are similar, if (i) Their corresponding angles are equal and (ii) Their corresponding sides are in the same ratio (or proportion). Note: The same ratio of the corresponding sides is referred to as the scale factor (or the Representative Fraction) for the polygons. Equiangular triangles: If corresponding angles of two triangles are equal, then they are known as equiangular triangles. A famous Greek mathematician Thales gave an important truth relating to two equiangular triangles which is as follows: “The ratio of any two corresponding sides in two equiangular triangles is always the same.” Q. The Basic Proportionality Theorem (now known as the Thales Theorem) : “If a line is drawn parallel to one side of a triangle to intersect the other two sides in distinct points, the other two sides are divided in the same ratio. “ [Prove it.] Q. The converse of The Basic Proportionality Theorem: If a line divides any two sides of a triangle in the same ratio, then the line is parallel to the third side. [Prove it by contradiction methods] Q. In a triangle ABC, E and F are point on AB and AC and EF || BC. Prove that AB/AE = AC/AF Q. Prove that a line drawn through the mid-point of one side of a triangle parallel to another side bisects the third side. Q. Prove that the line joining the mid-points of any two sides of a triangle is parallel to the third side. Q. In a triangle ABC, E and F are point on AB and AC Such that AE/EB = AF/FC and <AEF =<ACB. Prove that ABC is an isosceles Triangle. Q. In a trapezium ABCD , AB || DC and E and F are points on non-parallel sides AD and BC respectively such that EF is parallel to AB .Show that AE/ ED = BF /FC [join AC to intersect EF at G] Q. In a trapezium ABCD , AB || DC and its diagonals intersect each other at the point O. Show that AO/ BO = CO/DO Q. The diagonals of a quadrilateral ABCD intersect each other at the point O such that AO/ BO = CO/DO . Show that ABCD is a trapezium. For solve and practice worksheet and CBSE Sample paper click on : Download File 10th maths Ch Similar Triangle Guess Paper SA-1 Download File Q.1 Give one example of each: metals and nonmetals.
Q.2 Name the metal, which is the best onductor of heat and electricity. Q.3 Name the property by which metals can be drawn into thin wires. Q.4 Name the gas produced, when metals react with acids. Q.5 What is the color of the copper sulphate solution ? Q.6 State the nature of oxides of non-metals. Q.7 Which metal is stored in kerosene ? Q.8 Name the property of the metal by which it can be drawn into thin sheets. Q.9 What happens when sulphur reacts with oxygen ? Q.10 Which non-metal catches fire, if exposed to air ? Q.11 Name the gas that burns with a POP sound. Q.12 What are Displacement reactions ? Q.13 Give one use of non-metal in our daily life. Q.14 What are metalloids ? Q.15 Which metal is use to wrap food items ? Sol.1 Metals : Copper Non-Metals : Sulphur Sol.2 Silver Sol.3 Ductility Sol.4 Hydrogen gas Sol.5 Blue Sol.6 The oxides of non-metals are acid in nature. Sol.7 Sodium Sol.8 Malleability Sol.9 Sulphur di oxide is formed. S + O2 = SO2 Sol.10 Phosphorus Sol.11 Hydrogen gas Sol.12 The reactions in which more reactive metals displace less reactive metals from their compounds in aqueous solution are called displacement reaction. Sol.13 Chlorine is used in purification of water Sol.14 Metalloids are those which posses the character of both metals and non-metals. Sol.15 Aluminium Q.1 What happens when sulphur di-oxide reacts with water ? Give the chemical reaction involved. Q.2 Why lemon pickle cannot be stored in an aluminium foil ? Q.3 Write two important properties of metals. Q.4 Why copper cannot displace zinc from zinc sulphate solution ? Q.5 Why immersion rods for heating are made up of metallic substances ? Q.6 What happens when iron nails are dipped in water in a test tube for a week ? Q.7 What happens when iron reacts with oxygen and water ? Give the chemical reaction involved. Q.8 What happens when copper vessel is exposed to moist air for a long time ? Give the chemical reaction that takes place. Q.9 Why gold is preferred in making jewellery? Q.10 What happens when dilute sulphuric acid is poured on a zinc plate ? Write the chemical reaction takes Q.11 What happens when magnesium ribbon is burnt in air ? Q.12 Why metals are used in making aeroplanes, bridges, satellites etc. Q.13 Complete the following chemical reactions. Zn + H2SO4 → 2Cu + H2O + CO2 → 2Fe + O2 + H2O → SO2 + H2O → Cu + HCl → LONG ANSWER TYPE QUESTIONS Q.14 What will happen when ash of magnesium is dissolved in water ? Is the solution acidic or basic ? What effect does litmus show in case of oxides of metals ? Q.15 Explain the following terms : (i) Malleability (ii) Ductility (iii) Sonorous (iv)Lustrous (v) Metalloids. Solution: Sol.1 Sulphrous acid is formed. SO2 + H2O = H2SO3 Sol.2 Aluminium reacts with the citric acid present in the lemon. Sol.3 (a) Good conductors of heat and electricity. (b) Lustrous, i.e., they can shine. Sol.4 Because copper is less reactive than zinc. Sol.5 Because metals are good conductors of heat. Sol.6 A brown layer gets deposited on the iron nails, which is called as the rust. Sol.7 Iron oxide is formed and hydrogen gas is produced. The chemical reaction that takes place is : 2Fe + O2 + H2O → Fe2O3 + H2 Sol.8 When copper vessel is exposed to moist air for a long time, it acquires a dull green coating. The green material is a mixture of copper hydroxide and copper carbonate. The following chemical reaction takes place: 2Cu + H2O + CO2 + O2 → Cu(OH)2 + CuCO3 Sol.9 Gold is preferred in making jewellery because gold is a lustrous metal and also possess the property of malleability. Sol.10 As we know that zinc is more reactive than hydrogen, so it displaces hydrogen from sulphuric acid and forms zinc sulphate. The chemical reaction that takes place during the process is given by Zn + H2SO4 → ZnSO4 + H2 Sol.11 As magnesium is a metal and we know that when metals react with oxygen the oxide formation takes place. 2Mg + O2 → 2MgO Sol.12 Due to their hardness, metals are preferred in making such things. Sol.13. Zn + H2SO4 → Zn SO4 + H2 2Cu + H2O + CO2 →CuCO3+H2O 2Fe + O2 + H2O → Fe2O3 + H2SO2 + H2O Cu + HCl →CuCl2 + H2 Sol.14 When ash of magnesium is dissolved in water then magnesium oxide is formed. 2Mg + O2 → 2MgO The oxides of metals are basic in nature. In case of metals the red litmus will turn to blue color. Sol.15 (i) Malleability : The property of the metals by which they can be drawn into sheets. (ii) Ductility : The property of the metals by which they can drawn into thin wires. (iii) Sonorous : The property of the metals by which they produce ringing sound when struck hard. (iv) Lustrous : The property of the metals by which they appear to be shiny. (v) Metalloids : Those materials that posses the property of both metals and non-metals. |
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