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Science Delhi Set 3 2009-2010 CBSE Class 10 Question Paper Solution

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SubjectScience
Year2009 - 2010 (March)
Science [Delhi Set 3]
Marks: 60Academic Year: 2009-2010
Date: March 2010

[1]1

Name the part of our eyes which helps us to focus near and distant objects in quick succession.

Concept: Concept of Human Eye
Chapter: [3] Natural Phenomena
[1]2

The shiny outer surface of a hollow sphere of aluminium of radius 50 cm is to be used as a mirror: 

 What will be the focal length of this mirror?

Concept: Reflection of Light - Spherical Mirrors
Chapter: [3] Natural Phenomena

The shiny outer surface of a hollow sphere of aluminium of radius 50 cm is to be used as a mirror: 

 Which type of spherical mirror will it provide? 

 

Concept: Reflection of Light - Spherical Mirrors
Chapter: [3] Natural Phenomena
[1]3

What is the nature of image formed by a concave mirror if the magnification produced by the mirror  

 +4 

Concept: Mirror Formula and Magnification
Chapter: [3] Natural Phenomena
[1]4

A charged particle enters at right angles into a uniform magnetic field as shown: 

 

What should be the nature of charge on the particle if it begins to move in a direction pointing vertically our of the page due to its interaction with the magnetic field?  

Concept: Magnetic Field and Field Lines
Chapter: [4.01] Magnetic Effects of Current
[1]5

On what basis is a chemical equation balanced?

Concept: Balanced Chemical Equation
Chapter: [1.05] Chemical Reactions
[1]6

State two characteristic features of carbon which when put together give rise to a large number of carbon compounds.

Concept: Carbon and Compounds Introduction
Chapter: [1.01] Carbon Compounds
[2]7

Write any two observations in an activity which may suggest that a chemical reaction has taken place. Give an example in support of your answer.

Concept: Chemical Equation
Chapter: [1.05] Chemical Reactions
[2]8

What are fossil fuels?

Concept: Natural Resources - Coal and Petroleum
Chapter: [5.01] Management of Natural Resources

Write two disadvantages of burning fossil fuels.

Concept: Natural Resources - Coal and Petroleum
Chapter: [5.01] Management of Natural Resources
[2]9

Two coils A and B of insulated wire are kept close to each other. Coil A is connected to a galvanometer while coil B is connected to a battery through a key. What would happen if: 

the current is stopped by removing the plug from the key? 

Explain your answer mentioning the name of the phenomenon involved. 

Concept: Magnetic Field Due to a Current carrying Straight Conductor
Chapter: [4.01] Magnetic Effects of Current

Two coils A and B of insulated wire are kept close to each other. Coil A is connected to a galvanometer while coil B is connected to a battery through a key. What would happen if: 

a current is passed through coil B by plugging the key?  

Explain your answer mentioning the name of the phenomenon involved.

 

Concept: Magnetic Field Due to a Current carrying Straight Conductor
Chapter: [4.01] Magnetic Effects of Current
[2]10

What is a solenoid?

Concept: Magnetic Field Due to a Current in a Solenoid
Chapter: [4.01] Magnetic Effects of Current

Draw the pattern of magnetic field lines of a solenoid through which a steady current flows. What does the pattern of field lines inside the solenoid indicate?

Concept: Magnetic Field Due to a Current in a Solenoid
Chapter: [4.01] Magnetic Effects of Current
[3]11

What is Hypermetropia (far sightedness)? 

Concept: Defects of Vision and Their Correction
Chapter: [3] Natural Phenomena

Draw a ray diagram to show how Hypermetropia is defect can be corrected using a lens.

Concept: Defects of Vision and Their Correction
Chapter: [3] Natural Phenomena
[3]12

Mention any four limitations in harnessing wind energy on a large scale.

Concept: Conventional Sources of Energy - Thermal Power Plant
Chapter: [5.03] Sources of Energy
[3]13

At what distance should an object be placed from a lens of focal length 25 cm to obtain its image on a screen placed on the other side at a distance of 50 cm from the lens? What will be the magnification produced in this case?

Concept: Lens Formula and Magnification
Chapter: [3] Natural Phenomena
[3]14

Atoms of eight elements A, B, C, D, E, F, G and H have the same number of electron shells but different number of electrons in their outermost shells. It was found that elements A and G combine to form an ionic compound. This ionic compound is added in a small amount to almost all vegetables and dishes during cooking. Oxides of elements A and B are basis in nature while those of elements E and F acidic. The oxide of element D is, however, almost neutral. Based on the above information, answer the following questions:

(a) To which group or period of the periodic table do these elements belong?
(b) What would be the nature of compound formed by a combination of elements B and F?
(c) Which two of these elements could definitely be metals?
(d) Which one of the eight elements is most likely to be found in gaseous state at room temperature?
(e) If the number of electrons in the outermost shell of elements C and G be 3 and 7 respectively, write formula of the compound formed by the combination of C and G.

Concept: Periodic Classification of Elements Questions
Chapter: [1.03] Periodic Classification of Elements
[5]15

No chemical reaction takes place when granules of a solid, A, are mixed with the powder of another solid, B. However when the mixture is heated, a reaction takes place between its components. One of the products, C, is a metal and settles down in the molten state while the other product, D, floats over it. It was observed that the reaction is highly exothermic.

(i) Based on the given information make an assumption about A and B and write a chemical equation for the chemical reaction indicating the conditions of reaction, physical state of reactants and products and thermal status of reaction.

(ii) Mention any two types of reactions under which above chemical reaction can be classified.

Concept: Corrosion and Its Prevention
Chapter: [1.02] Metals and Non Metals
[5]16

Name the functional group of organic compounds that can be hydrogenated. With the help of a suitable example, explain the process of hydrogenation, mentioning the conditions of the reaction and any one change in physical property with the formation of the product. Name any one natural source of organic compounds that are hydrogenated.

Concept: Versatile Nature of Carbon - Nomenclature of Carbon Compounds
Chapter: [1.01] Carbon Compounds
[1]17 | Attempt one of the following
[1]17.1

Derive the expression for the heat produced due to a current ‘I’ flowing for a time interval ‘t’ through a resistor ‘R’ having a potential difference ‘V’ across its ends. With which name is the relation known? How much heat will an instrument of 12W produce in one minute if it is connected to a battery of 12V?

Concept: Magnetic Field Due to a Current in a Solenoid
Chapter: [4.01] Magnetic Effects of Current
[1]17.2

Explain with the help of a labelled circuit diagram how you will find the resistance of a combination of three resistors, or resistance R1, R2 and R3, joined in parallel. Also mention how you will connect the ammeter and the voltmeter in the circuit when measuring the current in the circuit and the potential difference across one of the three resistors of the combination.

Concept: Circuit Diagram
Chapter: [4.02] Effects of Current
[1]18 | Attempt one of the following
[1]18.1

Write the names and symbols of two very reactive metals belonging to group 1 of the periodic table. Explain by drawing electronic structure, how either one of the two metals reacts with a halogen. With which name is the bond formed between these elements known and what is the class of the compound so formed known? State any four physical properties of such compounds.

Concept: Periodic Classification of Elements Questions
Chapter: [1.03] Periodic Classification of Elements
[1]18.2

What is meant by refining of a metal? Name the most widely used method for the refining of impure metals obtained by various reduction processes. Describe this method with the help of a labelled diagram by taking the example of any metal.

Concept: Occurrence of Metals - Refining of Metals
Chapter: [1.02] Metals and Non Metals
[1]19

Name the hormone that helps in regulating level of sugar in our blood. Name the gland that secrets it.

Concept: Nutrition - Nutrition in Human Beings
Chapter: [2.04] Life Processes
[2]20

A person lives near a forest. Make a list of four items which he can get from the forest to meet his daily needs.

 

 
Concept: Concept of Life Processes
Chapter: [2.04] Life Processes
[2]21

Name the green dot like structures in some cells observed by a student when a leaf peel was viewed under a microscope. What is this green colour due to?

 

 
Concept: Concept of Life Processes
Chapter: [2.04] Life Processes
[2]22

What is phototropism?

Concept: Sexual Reproduction in Flowering Plants
Chapter: [2.02] Reproduction

Describe an activity to demonstrate phototropism.

Concept: Sexual Reproduction in Flowering Plants
Chapter: [2.02] Reproduction
[2]23

List any two differences between pollination and fertilisation.

Concept: Sexual Reproduction in Flowering Plants
Chapter: [2.02] Reproduction
[2]24

Give one example each of characters that are inherited and the ones that are acquired in humans. Mention the difference between the inherited and the acquired characters.

Concept: Evolution - Acquired and Inherited Traits
Chapter: [2.01] Heredity and Evolution
[3]25

How is ozone formed in the higher level of atmosphere?

Concept: Ozone Layer
Chapter: [5.02] Our Environment

 “Damage to the ozone layer is a cause of concern”. Justify this statement.

Concept: Ozone Layer
Chapter: [5.02] Our Environment
[3]26

Write the full form of DNA.

Concept: Reproduction - Introduction
Chapter: [2.02] Reproduction

Name the part of the cell where DNA is located?

Concept: Reproduction - Introduction
Chapter: [2.02] Reproduction

Explain the role of DNA in the process of reproduction of the cell.

Concept: Reproduction - Introduction
Chapter: [2.02] Reproduction
[5]27 | Attempt one of the following
[5]27.1

Explain the process of digestion of food in mouth, stomach and small intestine in human body.

Concept: Nutrition - Nutrition in Human Beings
Chapter: [2.04] Life Processes
[5]27.2

 List the three events that occur during the process of photosynthesis. Explain the role of stomata in this process.

Concept: Nutrition - Autotrophic Nutrition
Chapter: [2.04] Life Processes

Describe an experiment to show that “sunlight is essential for photosynthesis”.

Concept: Some Natural Phenomena Due to Sunlight
Chapter: [3] Natural Phenomena

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