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Science Delhi set 1 2018-2019 CBSE (English Medium) Class 10 Question Paper Solution

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Science [Delhi set 1]
Marks: 80 Academic Year: 2018-2019
Date: March 2019
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SECTION - A
[1] 1

Answer the following question.
What is the function of a galvanometer in a circuit?

Concept: Electric Current
Chapter: [0.12] Electricity
[1] 2

Answer the following question.
Why is biogas considered excellent fuel?

Concept: Bio-energy
Chapter: [0.14] Sources of Energy
Section B
[2] 3
[2] 3.1

Answer the following question.
How it can be proved that the basic structure of the Modern Periodic Table is based on the electronic configuration of atoms of different elements?

Concept: The Modern Periodic Table
Chapter: [0.05] Periodic Classification of Elements
OR
[2] 3.2
[1] 3.2.1

The electronic configuration of an element is 2, 8, 4. State it: 
group and period in the Modern Periodic Table.

Concept: Periodic Properties
Chapter: [0.05] Periodic Classification of Elements
[1] 3.2.2

The electronic configuration of an element is 2, 8, 4. State it: 
name and write its one physical property.

Concept: Periodic Properties
Chapter: [0.05] Periodic Classification of Elements
[2] 4

Answer the following question.
Write two different ways in which glucose is oxidized to provide energy in the human body. Write the products formed in each case.

Concept: Human Digestive System
Chapter: [0.06] Life Processes
[2] 5

Define the term: Power of accommodation of the eye.

Concept: Human Eye: Structure of the Eye
Chapter: [0.11] The Human Eye and the Colourful World

Answer the following question.
Write the modification in the curvature of the eye lens which enables us to see the nearby objects clearly?

Concept: Spherical Mirrors
Chapter: [0.1] Light - Reflection and Refraction
Section C
[3] 6
[3] 6.1

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: [0.01] Chemical Reactions and Equations
[3] 6.2
[2] 6.2.1

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: [0.01] Chemical Reactions and Equations
[1] 6.2.2

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: [0.01] Chemical Reactions and Equations
[3] 7

Answer the following question.
Identify the acid and the base from which sodium chloride is obtained. Which type of salt is it? When is it called rock salt? How is rock salt formed?

Concept: Acids
Chapter: [0.02] Acids, Bases and Salts
[3] 8

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: [0.05] 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: [0.05] 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: [0.05] Periodic Classification of Elements
[3] 9

Write three types of blood vessels. Give one important feature of each.

Concept: Blood Vessels – Arteries, Veins, and Capillaries
Chapter: [0.06] Life Processes
[3] 10

Answer the following question.
Trace the sequence of events Whichoccur when a bright light is focused on your eyes.

Concept: Human Eye: Structure of the Eye
Chapter: [0.11] The Human Eye and the Colourful World
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[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: Control and Co-ordination in Plants
Chapter:
[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: [0.09] Heredity and Evolution
OR
[3] 12.2

List three distinguishing features, in tabular form, between acquired traits and the inherited traits.

Concept: Evolution
Chapter: [0.09] Heredity and Evolution
[3] 13

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: [0.11] The Human Eye and the Colourful World
[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: [0.15] 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: [0.15] Our Environment
[3] 15

Answer the following question.
What is water harvesting? 

Concept: Water Management (Conservation of Water) - Fresh Water Management
Chapter: [0.16] Sustainable Management of Natural Resources

Answer the following question.
List two main advantages associated with water harvesting at the community level.

Concept: Water Management (Conservation of Water) - Fresh Water Management
Chapter: [0.16] Sustainable Management of Natural Resources

Answer the following question.
Write two causes for the failure of sustained availability of groundwater.

Concept: Water Management (Conservation of Water) - Fresh Water Management
Chapter: [0.16] Sustainable Management of Natural Resources
SECTION -D
[5] 16
[3] 16.1

Answer the following question.
List in tabular from three chemical properties on the basis of which we can differentiate between a metal and a non-metal.

Concept: Difference Between Metals, Non-metals, Metalloids, and Noble Gases
Chapter:
[2] 16.2

Give reasons for the following:
Most metals conduct electricity well.

Concept: Difference Between Metals, Non-metals, Metalloids, and Noble Gases
Chapter:

Give reasons for the following:
The reaction of iron (III) oxide [Fe2O3] with heated aluminum is used to join cracked machine parts.

Concept: Types of Chemical Change or Chemical Reaction - Single Displacement Reactions
Chapter: [0.01] Chemical Reactions and Equations
[5] 17
[5] 17.1

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: [0.04] Carbon and its Compounds
OR
[5] 17.2

Answer the following question.
What is methane?

Concept: Carbon: a Versatile Element
Chapter: [0.04] Carbon and its Compounds

Answer the following question.
Draw methane electron dot structure.

Concept: Carbon: a Versatile Element
Chapter: [0.04] Carbon and its Compounds

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

Concept: Carbon: a Versatile Element
Chapter: [0.04] Carbon and its Compounds

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

Concept: Carbon: a Versatile Element
Chapter: [0.04] Carbon and its Compounds

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

Concept: Carbon: a Versatile Element
Chapter: [0.04] Carbon and its Compounds

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

Concept: Carbon: a Versatile Element
Chapter: [0.04] Carbon and its Compounds
[5] 18
[5] 18.1

Answer the following question.
What is pollination? Explain the different types of pollination.

Concept: Sexual Reproduction in Flowering Plants
Chapter: [0.08] How do Organisms Reproduce?

Answer the following question.
List two agents of pollination?

Concept: Sexual Reproduction in Flowering Plants
Chapter: [0.08] How do Organisms Reproduce?

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

Concept: Sexual Reproduction in Flowering Plants
Chapter: [0.08] How do Organisms Reproduce?
OR
[5] 18.2
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[2] 18.2.1

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

Concept: Human Reproductive System
Chapter: [0.08] How do Organisms Reproduce?
[3] 18.2.2

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

Concept: Human Reproductive System
Chapter: [0.08] How do Organisms Reproduce?
[5] 19

An object is placed at a distance of 60 cm from a concave lens of focal length 30 cm.
(i) Use the lens formula to find the distance of the image from the lens.
(ii) List four characteristics of the image (nature, position, size, erect/inverted) formed by the lens in this case.
(iii) Draw a ray diagram to justify your answer of the part (ii).

Concept: Concave Lens
Chapter: [0.1] Light - Reflection and Refraction
[5] 20
[5] 20.1

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: [0.12] Electricity
OR
[5] 20.2

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: [0.12] Electricity
[5] 21

Answer the following term.
What is a solenoid?

Concept: Magnetic Field Due to a Current Carving Cylindrical Coil (or Solenoid)
Chapter: [0.13] Magnetic Effects of Electric Current

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: [0.13] Magnetic Effects of Electric Current
Section E
[2] 22
[2] 22.1

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: [0.02] Acids, Bases and Salts
OR
[2] 22.2

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: [0.01] Chemical Reactions and Equations
[2] 23

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: [0.04] Carbon and its Compounds
[2] 24
[2] 24.1

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: [0.08] How do Organisms Reproduce?
OR
[2] 24.2

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

Concept: Asexual Reproduction - Asexual Reproduction in Plant
Chapter: [0.08] How do Organisms Reproduce?
[2] 25

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: [0.06] Life Processes
[2] 26
[2] 26.1

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: [0.12] Electricity
OR
[2] 26.2

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: [0.12] Electricity
[2] 27

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: [0.1] Light - Reflection and Refraction

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