Class 10 science

Question 1

What is area sown more than once in an agriculture year plus net sown area known as?

Question

(a) Permanent pastures (b) Fallow lands (c) Net sown area (d) Gross cropped area

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Class 10 science 3 years 1 Answer 38 views Enlightened 0

Question 2

Rohan wants to measure the distance of a pond during the visit to his native. He marks points A and B on the opposite edges of a pond as shown in the figure below. To find the distance between the points, he makes a right-angled triangle using rope connecting B with another point C are a distance of 12m, connecting C to point D at a distance of 40m from point C and the connecting D to the point A which is are a distance of 30m from D such the ∠ADC=900.Find the length of the rope used.

Question

a) 120m b) 70m c) 82m d) 22m

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Class 10 science 3 years 1 Answer 37 views Enlightened 0

Question 3

Reactive metals can displace less reactive metals from their compounds in solution or molten form. all metals are not equally reactive. We checked the reactivity of various metals with oxygen, water and acids. But all metals do not react with these reagents. Displacement reactions give better evidence about the reactivity of metals. It is simple and easy if metal A displaces metal B from its solution, it is more reactive than B. The reactivity series is a list of metals arranged in the order of their decreasing activities.

Question

(i).Which of the following is the correct arrangement of the given metals in dscending order of their reactivity? Zinc, Iron, Magnesium, Sodium (a)Sodium > Magnesium > Zinc > iron (b) Sodium > Magnesium > Zinc > iron (c) Sodium > ...

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Class 10 science 3 years 1 Answer 42 views Enlightened 1

Question 4

You must have observed that iron articles are shiny when new, but get coated with a reddish brown powder when left for some time. This process is commonly known as rusting of iron. Some other metals also get tarnished in this manner. Have you noticed the colour of the coating formed on copper and silver? When a metal is attacked by substances around it such as moisture, acids, etc., it is said to corrode and this process is called corrosion. The black coating on silver and the green coating on copper are other examples of corrosion

Question

(i).Chemically rust is (a).only ferric oxide (b).hydrated ferric oxide (c).hydrated ferrous oxide (ii).Rusting of iron involves a chemical reaction which is a combination of: (a) Reduction as well as combination reactions (b) Oxidation as well as combination reactions (c) Oxidation as well ...

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Class 10 science 3 years 1 Answer 531 views Enlightened 1

Question 5

All metals do not react with oxygen at the same rate. Different metals show different reactivities towards oxygen. Metals such as potassium and sodium react so vigorously that they catch fire if kept in the open. Hence, to protect them and to prevent accidental fires, they are kept immersed in kerosene oil. At ordinary temperature, the surfaces of metals such as magnesium, aluminium, zinc, lead, etc., are covered with a thin layer of oxide. The protective oxide layer prevents the metal from further oxidation. Iron does not burn on heating but iron filings burn vigorously when sprinkled in the flame of the burner. Copper does not burn, but the hot metal is coated with a black coloured layer of copper(II) oxide. Silver and gold do not react with oxygen even at high temperatures.

Question

(i)Which of the following oxide(s) of iron would be obtained on prolonged reaction of iron with steam? (a).FeO (b) .Fe2O3 (c) .Fe3O4 (ii).Which one of the given metals does not react with cold as well as hot water? (a).Na (b).Fe (c).Mg

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Class 10 science 3 years 1 Answer 265 views Enlightened 0

Question 6

Samples of four metals A, B, C and D were taken and added to the following solution one by one. The results obtained have been tabulated as follows:

Question

Use the table given above to answer the f0llowing questions about metals A,B,C and D. (a) Which is the most reactive metal? (b) What would you observe if B is added to a solution of Copper(II) sulphate? (c) Arrange the ...

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Class 10 science 3 years 1 Answer 7 views Enlightened 0

Question 7

.On the basis of reactivity of different metals with oxygen, water and acids as well as displacement reactions, the metals have been arranged in the decreasing order of their reactivities. This arrangement is known as activity series or reactivity series of metals. The basis of reactivity is the tendency of metals to lose electrons. If a metal can lose electrons easily to form positive ions, it will react readily with other substances. Therefore, it will be a reactive metal. On the other hand, if a meal loses electrons less rapidly to form a positive ion, it will react slowly with other substances. Therefore, such a metal will be less reactive.

Question

(i) Which of the following metals is less reactive than hydrogen? (a) Copper (b) Zinc (c) Magnesium (d) Lead (ii) Which of the following metals is more reactive than hydrogen? (a) Mercury (b) Platinum (c) Iron (d) Gold (iii) Which of the ...

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Class 10 science 3 years 1 Answer 54 views Enlightened 0

Question 8

.Assertion (A) : When soft iron nails are dipped in a strong solution of copper sulphate, a greenish black solution is formed. Reason (R) : Iron replaces copper from copper sulphate solution forming iron sulphate

Question

(a) Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion. (b) The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion. (c) Assertion ...

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Class 10 science 3 years 1 Answer 142 views Enlightened 0

Question 9

Assertion : The minerals from which the metals can be extracted conveniently and profitably are called ores. Reason : All the ores are minerals, but all the minerals can not be ores

Question

(a) Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion. (b) The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion. (c) Assertion ...

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Class 10 science 3 years 1 Answer 6 views Enlightened 0

Question 10

Assertion : The minerals from which the metals can be extracted conveniently and profitably are called ores. Reason : All the ores are minerals, but all the minerals can not be ores.

Question

(a) Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion. (b) The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion. (c) Assertion ...

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Class 10 science 3 years 1 Answer 13 views Enlightened 0

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Class 10 science