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Science Delhi set 2 2018-2019 CBSE (English Medium) Class 10 Question Paper Solution

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Science [Delhi set 2]
Marks: 80 Academic Year: 2018-2019
Date: March 2019
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  • Question numbers 1 and 2 in Section A are one mark questions. 
  • Question numbers 3 to 5 in Section B are two marks questions.
  • Question numbers 6 to 15 in Section C are three-marks questions.
  • Question numbers 16 to 21 in Section D are five-marks questions.
  • Question numbers 22 to 27 in Section E are based on practical skills. Each question is a two marks question.

SECTION - A
[1] 1

Name and define the SI unit of current.

Concept: Magnetic Field
Chapter: [0.040999999999999995] Magnetic Effects of Current
[1] 2

Answer the following question.
Write the name of the main constituent of Biogas. Also, state its percentage.

Concept: Renewable and Non-renewable Energy Resources
Chapter: [0.053] Sources of Energy
SECTION - B
[2] 3
[2] 3.1

Answer the following question.
Write the name, symbol, and electronic configuration of an element X whose atomic number is 11.

Concept: History of Periodic Table: Early Attempts at the Classification of Elements
Chapter: [0.013000000000000001] Periodic Classification of Elements
OR
[2] 3.2

Can the following groups of elements be classified as Dobereiner's triad:
Na, Si, Cl
Atomic mass of Na - 23, Si - 28, Cl - 35.
Justify your answer.

Concept: Dobereiner’s Triads
Chapter: [0.013000000000000001] Periodic Classification of Elements

Can the following groups of elements be classified as Dobereiner's triad:
Be, Mg, Ca
Atomic mass of Be - 9, Mg - 24, Ca - 40.
Justify your answer.

Concept: Dobereiner’s Triads
Chapter: [0.013000000000000001] Periodic Classification of Elements
[2] 4

Answer the following question.
How is O2 and CO2 transported in human beings?

Concept: Respiration
Chapter: [0.024] Life Processes
[2] 5

Answer the following question.
Write the structure of eye lens and state the role of ciliary muscles in the human eye.

Concept: Human Eye: Structure of the Eye
Chapter: [0.03] Natural Phenomena
SECTION - C
[3] 6

Answer the following question.
Identify the acid and base which form sodium hydrogen carbonate. Write the chemical equation in support of your answer. State whether this compound is acidic, basic, or neutral. Also, write its pH value.

Concept: Properties of Acids
Chapter: [0.013999999999999999] Acids, Bases and Salts
[3] 7

Based on the group valency of element write the molecular formula of the following compound giving justification:
Oxide of first group elements.

Concept: Periodic Properties
Chapter: [0.013000000000000001] Periodic Classification of Elements

Based on the group valency of element write the molecular formula of the following compound giving justification:

Halide of the elements of group thirteen

Concept: Periodic Properties
Chapter: [0.013000000000000001] Periodic Classification of Elements

Based on the group valency of element write the molecular formula of the following compound giving justification:

Compound formed when an element A of group 2 combines with an element B of group seventeen.

Concept: Periodic Properties
Chapter: [0.013000000000000001] Periodic Classification of Elements
[3] 8
[3] 8.1

Answer the following question.
2 g of silver chloride is taken in a china dish and the china dish is placed in sunlight for some time. What will be your observation in this case? Write the chemical reaction involved in the form of a balanced chemical equation. Identify the type of chemical reaction.

Concept: Types of Chemical Change or Chemical Reaction - Decomposition Reactions
Chapter: [0.015] Chemical Reactions
OR
[3] 8.2
[2] 8.2.1

Identify the type of reaction taking place in the following case and write the balanced chemical equation for the reaction.
Zinc reacts with silver nitrate to produce zinc nitrate and silver.

Concept: Types of Chemical Change or Chemical Reaction - Single Displacement Reactions
Chapter: [0.015] Chemical Reactions
[1] 8.2.2

Identify the type of reaction taking place in the following case and write the balanced chemical equation for the reaction.
Potassium iodide reacts with lead nitrate to produce potassium nitrate and lead iodide.

Concept: Types of Chemical Change or Chemical Reaction - Double Displacement Reaction
Chapter: [0.015] Chemical Reactions
[3] 9

Define the following Term:
Transpiration.

Concept: Concept of Transportation
Chapter: [0.024] Life Processes

Answer the following question.
Design an experiment to demonstrate the transpiration process.

Concept: Concept of Transportation
Chapter: [0.024] Life Processes
[3] 10

Answer the following question.
What is the feedback mechanism of harmonic regulation. Take the example of insulin to explain this phenomenon.

Concept: The Tropic Movements in Plants
Chapter:
[3] 11

Answer the following question.
What are plant hormones? Name the plant hormones responsible for the following:
(i) Growth of stem
(ii) Promotion of cell division
(iii) Inhibition of growth
(iv) Elongation of cells

Concept: The Tropic Movements in Plants
Chapter:
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[3] 12
[3] 12.1

Answer the following question.
Name the plant Mendel used for his experiment. What type of progeny was obtained by Mendel in F1 and F2 generations when he crossed the tall and short plants? Write the ratio he obtained in F2 generation plants.

Concept: Heredity
Chapter: [0.021] Heredity and Evolution
OR
[3] 12.2

List two differences between acquired traits and inherited traits by giving an example of each.

Concept: Evolution
Chapter: [0.021] Heredity and Evolution
[3] 13

Answer the following question.
Why should there be an equitable distribution of resources? List three forces that would be working against an equitable distribution of our resources.

Concept: Case Study: Ganga Pollution and Ganga Action Plan
Chapter: [0.051] Management of Natural Resources
[3] 14
[3] 14.1

Answer the following question.
How can we help in reducing the problem of waste disposal? Suggest any three methods.

Concept: Wastes Generated in Our Environment
Chapter: [0.052000000000000005] Our Environment
OR
[3] 14.2

Answer the following question.
Define an ecosystem. Draw a block diagram to show the flow of energy in an ecosystem.

Concept: Ecosystem
Chapter: [0.052000000000000005] Our Environment
[3] 15

Answer the following question:
What is a rainbow? Draw a labelled diagram to show the formation of a rainbow.

Concept: Applications of Scattering of Light
Chapter: [0.03] Natural Phenomena
SECTION - D
[5] 16
[5] 16.1

Answer the following question.
Write the chemical formula and name of the compound which is the active ingredient of all alcoholic drinks. List its two uses.

Write the chemical equation and name of the product formed when this compound reacts with -
(i) Sodium metal  
(ii) hot concentrated sulphuric acid

Concept: Ethanol
Chapter: [0.011000000000000001] Carbon Compounds
OR
[5] 16.2

Answer the following question.
What is methane?

Concept: Carbon: a Versatile Element
Chapter: [0.011000000000000001] Carbon Compounds

Answer the following question.
Draw methane electron dot structure.

Concept: Carbon: a Versatile Element
Chapter: [0.011000000000000001] Carbon Compounds

Answer the following question.
Name the type of bonds formed in the methane compound.

Concept: Carbon: a Versatile Element
Chapter: [0.011000000000000001] Carbon Compounds

Answer the following question.
Why are methane compounds have poor conductors of electricity?

Concept: Carbon: a Versatile Element
Chapter: [0.011000000000000001] Carbon Compounds

Answer the following question.
Why are methane compounds have low melting and boiling points?

Concept: Carbon: a Versatile Element
Chapter: [0.011000000000000001] Carbon Compounds

Answer the following question.
What happens when methane compound burns in oxygen?

Concept: Carbon: a Versatile Element
Chapter: [0.011000000000000001] Carbon Compounds
[5] 17
[5] 17.1

Write the chemical equation for the following reaction:
Calcium metal reacts with water.

Concept: Physical Properties of Metals
Chapter: [0.012] Metals and Non Metals

Write the chemical equation for the following reaction:
Cinnabar is heated in the presence of air.

Concept: Physical Properties of Metals
Chapter: [0.012] Metals and Non Metals

Write the chemical equation for the following reaction:
Manganese dioxide is heated with aluminum powder.

Concept: Physical Properties of Metals
Chapter: [0.012] Metals and Non Metals
OR
[5] 17.2

Answer the following question.
What are alloys?

Concept: Corrosion of Metals and Its Prevention
Chapter: [0.012] Metals and Non Metals [0.015] Chemical Reactions

Answer the following question.
List two properties of alloys.

Concept: Difference Between Metals, Non-metals, and Metalloids
Chapter:
[5] 18

Answer the following question:
An object is placed at a distance of 30 cm from a concave lens of focal length 30 cm.
(i) Use the lens formula to determine the distance of the image from the lens.
(ii) List four characteristics of the image (nature, position, size, erect/inverted) in this case.
(iii) Draw a labelled diagram to justify your answer of the part (ii)

Concept: Concave Mirror
Chapter: [0.03] Natural Phenomena
[5] 19
[3] 19.1

Answer the following question.
With the help of a suitable circuit diagram prove that the reciprocal of the equivalent resistance of a group of resistances joined in parallel is equal to the sum of the reciprocals of the individual resistances. 

Concept: Electric Circuit
Chapter: [0.042] Effects of Current
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[2] 19.2

Solve the following question:
In an electric circuit, two resistors of 12 0 each are joined in parallel to a 6 V battery. Find the current drawn from the battery.

Concept: System of Resistors - Resistances in Parallel
Chapter: [0.042] Effects of Current
OR
[2] 19.3

Answer the following question.
An electric lamp of resistance 20 Ω and a conductor of resistance 4 0 are connected to a 6 V battery as shown in the circuit. Calculate: 

(a) the total resistance of the circuit,  

(b) the current through the circuit, 

(c) the potential difference across the  (i) electric lamp and (ii) conductor, and

(d) power of the lamp.

Concept: Electric Current
Chapter: [0.042] Effects of Current
[5] 20

Answer the following question.
Draw the pattern of magnetic field lines of
(i) a current-carrying solenoid and
(ii) a bar magnet.
List two distinguishing features between the two fields.

Concept: Magnetic Field Lines
Chapter: [0.040999999999999995] Magnetic Effects of Current
[5] 21

Answer the following question.
How does suitable pollination lead to fertilization?

Concept: Sexual Reproduction in Flowering Plants
Chapter: [0.022000000000000002] Reproduction
OR
[5] 21.1

Identify the given diagram.
Name the parts 1 to 5. 

Concept: Human Reproductive System
Chapter: [0.022000000000000002] Reproduction
[5] 21.2

Answer the following question.
What is contraception? List three advantages of adopting contraceptive measures.

Concept: Human Reproductive System
Chapter: [0.022000000000000002] Reproduction
SECTION-E
[2] 22

Answer the following question.
In the experimental set up to show that "CO2 is given out during respiration", name the substance taken in the small test tube kept in the conical flask. State its function and the consequence of its use.

Concept: Respiration
Chapter: [0.024] Life Processes
[2] 23
[2] 23.1

A student is observing the temporary mount of a leaf peel under a microscope. Draw a labelled diagram of the structure of stomata as seen under the microscope

Concept: Sexual Reproduction in Flowering Plants
Chapter: [0.022000000000000002] Reproduction
OR
[2] 23.2

Draw a labelled diagram in proper sequence to show budding in hydra

Concept: Asexual Reproduction in Plant
Chapter: [0.022000000000000002] Reproduction
[2] 24

Answer the following question.
List four precautions which a student should observe while determining the focal length of a given convex lens by obtaining an image of a distant object on a screen. 

Concept: Convex Lens
Chapter: [0.03] Natural Phenomena
[2] 25
[2] 25.1

Answer the following question.
While studying the dependence of potential difference ( V) across a resistor on the current (I) passing through it, in order to determine the resistance of the resistor, a student took 5 readings for different values of current and plotted a graph between V and t. He got a straight line graph passing through the origin. What does the straight-line signify? Write the method of determining the resistance of the resister using this graph. 

Concept: System of Resistors - Resistors in Series
Chapter: [0.042] Effects of Current
[2] 25.2

What would you suggest to a student if while performing an experiment he finds that the pointer/needle of the ammeter and voltmeter do not coincide with the zero marks on the scales when the circuit is open? No extra ammeter/voltmeter is available in the laboratory.

Concept: Electric Potential (Electrostatic Potential) and Potential Difference
Chapter: [0.042] Effects of Current
[2] 26

Answer the following question.
In three test tubes A, B, and C, three different liquids namely, distilled water, underground water and distilled water in which a pinch of calcium sulphate is dissolved, respectively are taken. Equal amount of soap Answer is added to each test tube and the contents are shaken. In which test tube will the length of the foam (lather) be longest? Justify your answer.

Concept: Soap
Chapter: [0.011000000000000001] Carbon Compounds
[2] 27
[2] 27.1

Answer the following question.
Blue litmus solution is added to two test tubes A and B containing dilute HCl and NaOH solution respectively. In which test tube a colour change will be observed? State the colour change and give its reason.

Concept: Acid or a Base in a Water Solution
Chapter: [0.013999999999999999] Acids, Bases and Salts
OR
[2] 27.2

Answer the following question.
What is observed when 2 mL of dilute hydrochloric acid is added to 1 g of sodium carbonate taken in a clean and dry test tube? Write a chemical equation for the reaction involved.

Concept: Chemical Equation
Chapter: [0.015] Chemical Reactions
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