8

7

29 states

28 states, 8 union territories

7

Which of the following statement is NOT substantiated by any information from the passage

Why does Mithu enjoy himself thoroughly

Multiple Choice Questions 1. A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power (a) + 0.5 D (b) – 0.5 D (c) + 0.2 D (d) – 0.2 D 2. A student sitting on the last bench can read the letters written on the blackboard but is not able to read the letters written in his text book. Which of the following statements is correct? (a) The near point of his eyes has receded away (b) The near point of his eyes has come closer to him (c) The far point of his eyes has come closer to him (d) The far point of his eyes has receded away 4. At noon the sun appears white as (a) light is least scattered (b) all the colours of the white light are scattered away (c) blue colour is scattered the most (d) red colour is scattered the most 5. Which of the following phenomena of light are involved in the formation of a rainbow? (a) Reflection, refraction and dispersion (b) Refraction, dispersion and total internal reflection (c) Refraction, dispersion and internal reflection (d) Dispersion, scattering and total internal reflection 6. Twinkling of stars is due to atmospheric (a) dispersion of light by water droplets (b) refraction of light by different layers of varying refractive indices (c) scattering of light by dust particles (d) internal reflection of light by clouds 7. The clear sky appears blue because (a) blue light gets absorbed in the atmosphere (b) ultraviolet radiations are absorbed in the atmosphere (c) violet and blue lights get scattered more than lights of all other colours by the atmosphere (d) light of all other colours is scattered more than the violet and blue colour lights by the atmosphere 8. Which of the following statements is correct regarding the propagation of light of different colours of white light in air? (a) Red light moves fastest (b) Blue light moves faster than green light (c) All the colours of the white light move with the same speed (d) Yellow light moves with the mean speed as that of the red and the violet light 9. The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because among all other colours, the red light (a) is scattered the most by smoke or fog (b) is scattered the least by smoke or fog (c) is absorbed the most by smoke or fog (d) moves fastest in ai [22/10, 10:30 pm] Abha Mahant: 10. Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset? (a) Dispersion of light (b) Scattering of light (c) Total internal reflection of light (d) Reflection of light from the earth 11. The bluish colour of water in deep sea is due to (a) the presence of algae and other plants found in water (b) reflection of sky in water (c) scattering of light (d) absorption of light by the sea 12. When light rays enter the eye, most of the refraction occurs at the (a) crystalline lens (b) outer surface of the cornea (c) iris (d) pupil 13. The focal length of the eye lens increases when eye muscles (a) are relaxed and lens becomes thinner (b) contract and lens becomes thicker (c) are relaxed and lens becomes thicker (d) contract and lens becomes thinner 14. Which of the following statement is correct? (a) A person with myopia can see distant objects clearly (b) A person with hypermetropia can see nearby objects clearly (c) A person with myopia can see nearby objects clearly (d) A person with hypermetropia cannot see distant objects clearly Multiple Choice Questions 1. Which of the following is not a physical change? (a) Boiling of water to give water vapour (b) Melting of ice to give water (c) Dissolution of salt in water (d) Combustion of Liquefied Petroleum Gas (LPG) 2. The following reaction is an example of a 4NH3 (g) + 5O2 (g) → 4NO(g) + 6H2O(g) (i) displacement reaction (ii) combination reaction (iii) redox reaction (iv) neutralisation reaction (a) (i) and (iv) (b) (ii) and (iii) (c) (i) and (iii) (d) (iii) and (iv) 3. Which of the following statements about the given reaction are correct? 3Fe(s) + 4H2O(g) → Fe3O4 (s) + 4H2 (g) (i) Iron metal is getting oxidised (ii) Water is getting reduced (iii) Water is acting as reducing agent (iv) Water is acting as oxidising agent (a) (i), (ii) and (iii) (b) (iii) and (iv) (c) (i), (ii) and (iv) (d) (ii) and (iv) 4. Which of the following are exothermic processes? (i) Reaction of water with quick lime (ii) Dilution of an acid (iii) Evaporation of water (iv) Sublimation of camphor (crystals) (a) (i) and (ii) (b) (ii) and (iii) (c) (i) and (iv) (d) (iii) and (iv) 5. Three beakers labelled as A, B and C each containing 25 mL of water were taken. A small amount of NaOH, anhydrous CuSO4 and NaCl were added to the beakers A, B and C respectively. It was observed that there was an increase in the temperature of the solutions contained in beakers A and B, whereas in case of beaker C, the temperature of the solution falls. Which one of the following statement(s) is(are) correct? (i) In beakers A and B, exothermic process has occurred. (ii) In beakers A and B, endothermic process has occurred. (iii) In beaker C exothermic process has occurred. (iv) In beaker C endothermic process has occurred. (a) (i) only (b) (ii) only (c) (i) and (iv) (d) (ii) and (iii) 6. A dilute ferrous sulphate solution was gradually added to the beaker containing acidified permanganate solution. The light purple colour of the solution fades and finally disappears. Which of the following is the correct explanation for the observation? (a) KMnO4 is an oxidising agent, it oxidises FeSO4 (b) FeSO4 acts as an oxidising agent and oxidises KMnO4 (c) The colour disappears due to dilution; no reaction is involved (d) KMnO4 is an unstable compound and decomposes in presence of FeSO4 to a colourless compound. 7. Which among the following is(are) double displacement reaction(s)? (i) Pb + CuCl2 → PbCl2 + Cu (ii) Na2 SO4 + BaCl2 → BaSO4 + 2NaCl (iii) C + O2 → CO2 (iv) CH4 + 2O2 → CO2 + 2H2O (a) (i) and (iv) (b) (ii) only (c) (i) and (ii) (d) (iii) and (iv) 8. Which among the following statement(s) is(are) true? Exposure of silver chloride to sunlight for a long duration turns grey due to (i) the formation of silver by decomposition of silver chloride (ii) sublimation of silver chloride (iii) decomposition of chlorine gas from silver chloride (iv) oxidation of silver chloride (a) (i) only (b) (i) and (iii) (c) (ii) and (iii) (d) (iv) only 9. Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by liberation of heat. This process is called slaking of lime. Calcium hydroxide dissolves in water to form its solution called lime water. Which among the following is (are) true about slaking of lime and the solution formed? (i) It is an endothermic reaction (ii) It is an exothermic reaction (iii) The pH of the resulting solution will be more than seven (iv) The pH of the resulting solution will be less than seven (a) (i) and (ii) (b) (ii) and (iii) (c) (i) and (iv) (d) (iii) and (iv) 10. Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involved? (i) Displacement reaction (ii) Precipitation reaction (iii) Combination reaction (iv) Double displacement reaction (a) (i) only (b) (ii) only (c) (iv) only (d) (ii) and (iv) 11. Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is (a) 1:1 (b) 2:1 (c) 4:1 (d) 1:2 12. Which of the following is(are) an endothermic process(es)? (i) Dilution of sulphuric acid (ii) Sublimation of dry ice (iii) Condensation of water vapours (iv) Evaporation of water (a) (i) and (iii) (b) (ii) only (c) (iii) only (d) (ii) and (iv) 13. In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow precipitate of lead iodide is formed. While performing the activity if lead nitrate is not available, which of the following can be used in place of lead nitrate? (a) Lead sulphate (insoluble) (b) Lead acetate (c) Ammonium nitrate (d) Potassium sulphate 14. Which of the following gases can be used for storage of fresh sample of an oil for a long time? (a) Carbon dioxide or oxygen (b) Nitrogen or oxygen (c) Carbon dioxide or helium (d) Helium or nitrogen 15. The following reaction is used for the preparation of oxygen gas in the laboratory 2KClO3 (s) Heat → Catalyst 2KCl (s) + 3O2 (g) Which of the following statement(s) is(are) correct about the reaction? (a) It is a decomposition reaction and endothermic in nature (b) It is a combination reaction (c) It is a decomposition reaction and accompanied by release of heat (d) It is a photochemical decomposition reaction and exothermic in nature 16. Which one of the following processes involve chemical reactions? (a) Storing of oxygen gas under pressure in a gas cylinder (b) Liquefaction of air (c) Keeping petrol in a china dish in the open (d) Heating copper wire in presence of air at high temperature 17. In which of the following chemical equations, the abbreviations represent the correct states of the reactants and products involved at reaction temperature? (a) 2H2 (l) + O2 (l) → 2H2O(g) (b) 2H2 (g) + O2 (l) → 2H2O(l) (c) 2H2 (g) + O2 (g) → 2H2O(l) (d) 2H2 (g) + O2 (g) → 2H2O(g) 18. Which of the following are combination reactions? (i) 2KClO3 → Heat 2KCl + 3O2 (ii) MgO + H2O → Mg(OH)2 (iii) 4Al + 3O2 → 2Al2 O3 (iv) Zn + FeSO4 → ZnSO4 + Fe (a) (i) and (iii) (b) (iii) and (iv) (c) (ii) and (iv) (d) (ii) and (iii) Multiple Choice Questions 1. What happens when a solution of an acid is mixed with a solution of a base in a test tube? (i) The temperature of the solution increases (ii) The temperature of the solution decreases (iii) The temperature of the solution remains the same (iv) Salt formation takes place (a) (i) only (b) (i) and (iii) (c) (ii) and (iii) (d) (i) and (iv) 2. An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change? (a) Baking powder (b) Lime (c) Ammonium hydroxide solution (d) Hydrochloric acid 3. During the preparation of hydrogen chloride gas on a humid day, the gas is usually passed through the guard tube containing calcium chloride. The role of calcium chloride taken in the guard tube is to (a) absorb the evolved gas (b) moisten the gas (c) absorb moisture from the gas (d) absorb Cl– ions from the evolved gas 4. Which of the following salts does not contain water of crystallisation? (a) Blue vitriol (b) Baking soda (c) Washing soda (d) Gypsum

tell me the name of product

Ok

The statement tells that unlike the leaders of the sinhala community in Sri Lanka the leaders of our country didn't dominated on other states to use hindi compulsorily instead they gave equal status to all languages and prevented conflicts where as in sri lanka the sinhala community tried dominated their language over tamils hope it helps✌✌?

Zero dimensional defect

When the irregularity is found near a point is called point defect

When the irregularity is found near a point is called point defect

Defect at some point generally at the atom..

Expected MCQ for term 1 chemistry

Option no. 1 can be the polynomial as the power of its variable is a whole no. But if you see the second one the power of the variable x is not a whole no.

1.6

144

If that is a root 5 then it is a irrational no.

Sorry it was rational I should repeat that you can solve or prove it by taking its contradiction as it is a rational no.

You can prove it by taking its contradiction as it is an irrational no. Hope it will help you?

Is that root

Long term loans

public gives loan to a company , debenture is like a promissory note to public that it will give money back to public with interest to its debenture holders , Note :- no banking process involved here !

It's like a loan

Noo

78/99,79/99,80/99,81/99,82/99,83/99,84/99,85/99,86/99,87/99

This topic Is deleted from syllabus

https://www.successcds.net/class10/class-10-science-mcq/chapter-11-the-human-eye-and-the-colorful-world.html

What is atmospheric refraction

Hi

You can find out in Google

Acids which reacts with both acids as well as with bases is called amphoteric oxide. Example: Zinc oxide and aluminium oxide are examples of amphoteric oxide.

What is amphoteric oxide?

What is the colour of copper sulphate

Yes

Class 10 Science MCQs Chapter 3 Metals and Non-Metals 1. Aluminium is used for making cooking uten¬sils. Which of the following properties of alu¬minium are responsible for the same? (i) Good thermal conductivity (ii) Good electrical conductivity (iii) Ductility (iv) High melting point (a) (i) and (ii) (b) (i) and (iii) (c) (ii) and (iii) (d) (i) and (iv) Answer 2. The most abundant metal in the earth’s crust is (a) Iron (b) Aluminium (c) Calcium (d) Sodium Answer 3. The poorest conductor of heat among metals is (a) Lead (b) Mercury (c) Calcium (d) Sodium Answer Answer: a 4. Which property of metals is used for making bells and strings of musical instruments like Sitar and Violin? (a) Sonorousness (b) Malleability (c) Ductility (d) Conductivity Answer 5. Al2O3 + 2NaOH → …… + H2O (a) Al(OH)3 (b) Na2O (c) NaAlO2 (d) AlNaO2 Answer 6. Which of the following is the correct arrange-ment of the given metals in ascending order of their reactivity? Zinc, Iron, Magnesium, Sodium (a) Zinc > Iron > Magnesium > Sodium (b) Sodium > Magnesium > Iron > Zinc (c) Sodium > Zinc > Magnesium > Iron (d) Sodium > Magnesium > Zinc > Iron Answer 7. Which of the following pairs will give dis-placement reactions? (a) FeSO4 solution and Copper metal (b) AgNO3 solution and Copper metal (c) CuSO4 solution and Silver metal (d) NaCl solution and Copper metal Answer 8. Non-metals form covalent chlorides because (a) they can give electrons to chlorine (b) they can share electrons with chlorine (c) they can give electrons to chlorine atoms to form chloride ions (d) they cannot share electrons with chlorine atoms Answer 9. Which of the following oxide(s) of iron would be obtained on prolonged reaction of iron with steam? (a) FeO (b) Fe2O3 (c) Fe3O4 (d) Fe2O3 and Fe2O4 Answer/ Explanation 10. Which of tire following are not ionic compounds? (i) KCl (ii) HCl (iii) CCl4 (iv) NaCl (a) (i) and (ii) (b) (ii) and (iii) (c) (iii) and (iv) (d) (i) and (iii) Answer 11. The electronic configuration of three elements X, Y and Z are as follows: X = 2, 4, Y = 2, 7, Z = 2,1 Which two elements will combine to form an ionic compound and write the correct formula, (a) X2Y (b) YZ (c) XZ3</sub (d) Y2Z Answer 12. The highly reactive metals like Sodium, Potas-sium, Magnesium, etc. are extracted by the (a) electrolysis of their molten chloride (b) electrolysis of their molten oxides (c) reduction by aluminium (d) reduction by carbon Answer 13. Which of the following non-metal is lustrous? (a) Sulphur (b) Oxygen (c) Nitrogen (d) Iodine Answer 14. Example of an amphoteric oxide is: (a) Na2O (b) K2O (C) Al2O3 (d) MgO Answer 15. Which one among the following is an acidic oxide? (a) Na2O (b) CO (c) CO2 (d) Al2O3 Answer 16. The atomic number of an element ‘X’ is 12. Which inert gas is nearest to X? (a) He (b) Ar (c) Ne (d) Kr Answer/ Explanation 17, The process in which a carbonate ore is heated strongly in the absence of air to convert it into metal oxide is called (a) Roasting (b) Reduction (c) Calcination (d) Smelting Answer 18. Oxides of moderately reactive metals like Zinc, Iron, Nickel, Tin, Copper etc. are reduced by using (a) Aluminium as reducing agent (b) Sodium as reducing agent (c) Carbon as reducing agent (d) Calcium as reducing agent Answer 19. In thermite welding a mixture of …… and …… is ignited with a burning magnesium ribbon which produces molten iron metal as large amount of heat is evolved. (a) iron (III) oxide and aluminium powder (b) iron (II) oxide and aluminium powder (c) iron (III) chloride and aluminium powder (d) iron (III) sulphate and aluminium powder Answer 20. Galvanisation is a method of protecting iron from rudftng by coating with a thin layer of (a) Galium (b) Aluminium (c) Zinc (d) Silver Answer 21. An element X is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in air. It reacts vigorously with water. Identify the element from the following (a) Mg (b) Na (c) P (d) Ca Answer 22. Reaction between X and Y forms compound Z. X loses electron and Y gains electron. Which of the following properties is not shown by Z? (a) Has high melting point (b) Has low melting point (c) Conducts electricity in molten state (d) Occurs as solid Answer/ Explanation 23. The electronic configurations of three ele¬ments X, Y and Z are X — 2, 8; Y — 2, 8, 7 and Z — 2, 8, 2. Which’of the following is correct? (a) X is a metal (b) Y is a metal (c) Z is a non-metal (d) Y is a non-metal and Z is a metal Answer/ Explanation 24. Amalgam is an alloy of (a) Copper and Tin (b) Mercury (c) Lead and Tin (d) Copper and Zinc Answer 25. Copper objects lose their shine and form green coating of (a) Copper oxide (b) Copper hydroxide and Copper oxide (c) Basic Copper carbonate (d) Copper carbonate Answer Fill in the blanks 1. Elements can be classified as ……… and ……. . 2. Two examples of metals which are poor conductors of heat are ………, ……… . 3. Two metals which melt when kept on the palm are ………, ……… . 4. A non-metal which is a good conductor of electricity is ……… . 5. Metals can form positive ions by ……… . 6. A non-metal which is lustrous is ……… . 7. A metal which burns in air with a dazzling white flame is ……… . 8. Metals above hydrogen in the activity series can displace ……… from dilute acids. 9. The extraction of metals from their ores and then refining them for use is known as ……… . 10. ……… is an allotroph of carbon and is the hardest natural substance. 11. Metals which are so soft that they can be cut with a knife are ………, ……… 12. Metal oxides ……… and ……… dissolve in water to form alkalis. Answers 1. metals, non-metals 2. Lead, Mercury 3. Gallium, Caesium 4. Graphite 5. losing electrons 6. Iodine 7. Magnesium 8. Hydrogen 9. metallurgy 10. Diamond 11. Sodium, Potassium 12. Sodium Oxide and Potassium oxide We hope the given MCQ Questions for Class 10 Science Metals and Non-Metals with Answers will help you. If you have any query regarding CBSE Class 10 Science Chapter 3 Metals and Non-Metals Multiple Choice Questions with Answers, drop a comment below and we will get back to you at the earliest. 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Love u

Root-3

X=under hood 3

-root3

±3

-root3