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Science All India Set 1 2017-2018 CBSE Class 10 Question Paper Solution

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Science
All India Set 1
2017-2018 March
Marks: 80

[1]1

A Mendelian experiment consisted of breeding pea plants bearing violet flowers with pea plants bearing white flowers. What will be the result in F1 progeny?

Concept: Rules for the Inheritance of Traits - Mendel’s Contributions
Chapter: [2.01] Heredity and Evolution
[1]2

Write the energy conversion that takes place in a hydropower plant.

Concept: Conventional Sources of Energy - Hydro Power Plants
Chapter: [5.03] Sources of Energy
[2]3

A compound 'X' on heating with excess conc. sulphuric acid at 443 K gives an unsaturated compound 'Y'. 'X' also reacts with sodium metal to evolve a colourless gas 'Z'. Identify 'X', 'Y' and 'Z'. Write the equation of the chemical reaction of formation of 'Y' and also write the role of sulphuric acid in the reaction.

Concept: Versatile Nature of Carbon - Saturated and Unsaturated Carbon Compounds
Chapter: [1.01] Carbon Compounds
[2]4
[1]4.1

Name one gustatory receptor and one olfactory receptor present in human beings.

Concept: Human Brain - Involuntary Action
Chapter: [2.03] Control and Co-ordination in Animals and Plants
[1]4.2

Write a and b in the given flow chart of the neuron through which information travels as an electrical impulse.

Concept: Animals – Nervous System
Chapter: [2.03] Control and Co-ordination in Animals and Plants
[2]5

If the image formed by a spherical mirror for all positions of the object placed in front of it is always erect and diminished, what type of mirror is it? Draw a labelled ray diagram to support your answer.

Concept: Reflection of Light - Image Formation by Spherical Mirrors - Convex Mirror
Chapter: [3] Natural Phenomena
[3]6

Decomposition reactions require energy either in the form of heat or light or electricity for breaking down the reactants. Write one equation each for decomposition reactions where energy is supplied in the form of heat, light and electricity

Concept: Chemical Reactions - Types of Chemical Reactions - Decomposition
Chapter: [1.05] Chemical Reactions
[3]7 | attempt any one of the following
[3]7.1

2 mL of sodium hydroxide solution is added to a few pieces of granulated zinc metal taken in a test tube. When the contents are warmed, a gas evolves which is bubbled through a soap solution before testing. Write the equation of the chemical reaction involved and the test to detect the gas. Name the gas which will be evolved when the same metal reacts with dilute solution of a strong acid.

Concept: Balanced Chemical Equation
Chapter: [1.05] Chemical Reactions
[3]7.2

The pH of a salt used to make tasty and crispy pakoras is 14. Identify the salt and write a chemical equation for its formation. List its two uses.

Concept: Chemicals from Common Salt Introduction
Chapter: [1.04] Acids, Bases and Salts
[3]8
[2]8.1

 Why are most carbon compounds poor conductors of electricity?

Concept: Bonding in Carbon - Covalent Bond
Chapter: [1.01] Carbon Compounds
[1]8.2

Write the name and structure of a saturated compound in which the carbon atoms are arranged in a ring. Give the number of single bonds present in this compound.

Concept: Versatile Nature of Carbon - Saturated and Unsaturated Carbon Compounds
Chapter: [1.01] Carbon Compounds
[3]9
[1]9.1

Name the hormones secreted by the given endocrine glands and specify one function.

Thyroid

Concept: Hormones in Animals
Chapter: [2.03] Control and Co-ordination in Animals and Plants
[1]9.2

Name the hormones secreted by the given endocrine glands and specify one function.

Pituitary

Concept: Hormones in Animals
Chapter: [2.03] Control and Co-ordination in Animals and Plants
[1]9.3

Name the hormones secreted by the given endocrine glands and specify one function.

Pancreas

Concept: Hormones in Animals
Chapter: [2.03] Control and Co-ordination in Animals and Plants
[3]10

Write one main difference between asexual and sexual mode of reproduction. Which species is likely to have comparatively better chances of survival – the one reproducing asexually or the one reproducing sexually? Give reason to justify your answer.

Concept: Sexual Reproduction in Flowering Plants
Chapter: [2.02] Reproduction
[3]11 | attempt any one of the following
[3]11.1

State the laws of refraction of light. Explain the term 'absolute refractive index of a medium' and write an expression to relate it with the speed of light in vacuum.

Concept: Refraction of Light - Refractive Index
Chapter: [3] Natural Phenomena
[3]11.2

What is meant by power of a lens?

Concept: Refraction at Spherical Surfaces and by Lenses - Power of a Lens
Chapter: [3] Natural Phenomena

A student uses a lens of focal length 40 cm and another of –20 cm. Write the nature and power of each lens

Concept: Refraction at Spherical Surfaces and by Lenses - Power of a Lens
Chapter: [3] Natural Phenomena
[3]12 | attempt any one of the following
[3]12.1
[3]12.1.1

Show how would you join three resistors, each of resistance 9 Ω so that the equivalent resistance of the combination is 

1) 13.5 

2) 6 Ω

Concept: Resistance of a System of Resistors - Resistors in Parallel
Chapter: [4.02] Effects of Current
[3]12.2
[1]12.2.1

Write Joule's law of heating.

Concept: Heating Effect of Electric Current
Chapter: [4.02] Effects of Current
[2]12.2.2

Two lamps, one rated 100 W at 220 V, and the other 60 W at 220 V, are connected in parallel to electric mains supply. What current is drawn from the line if the supply voltage is 220 V?

Concept: Electric Power
Chapter: [4.02] Effects of Current
[3]13
[1]13.1

List the factors on which the resistance of a conductor in the shape of a wire depends.

Concept: Factors on Which the Resistance of a Conductor Depends
Chapter: [4.02] Effects of Current
[1]13.2

Why are metals good conductors of electricity whereas glass is a bad conductor of electricity? Give reason?

Concept: Electric Current and Circuit
Chapter: [4.02] Effects of Current
[1]13.3

Why are alloys commonly used in electrical heating devices? Give reason.

Concept: Factors on Which the Resistance of a Conductor Depends
Chapter: [4.02] Effects of Current
[3]14

Students in a school listened to the news read in the morning assembly that the mountain of garbage in Delhi suddenly exploded and various vehicles got buried under it. Several people were also injured and there was traffic jam all around. In the brain storming session the teacher also discussed this issue and asked the students to find out a solution to the problem of garbage. Finally they arrived at two main points -one is self management of the garbage we produce and the second is to generate less garbage at individual level.

1) Suggest two measures to manage the garbage we produce.

2) As an individual, what can we do to generate the least garbage? Give two points.

3) List two values the teacher instilled in his student in this episode.

Concept: Environment - Managing the Garbage We Produce
Chapter: [5.02] Our Environment
[3]15

What is a dam? Why do we seek to build large dams? While building large dams, which three main problems should particularly be addressed to maintain peace among local people? Mention them.

Concept: Natural Resources - Water for All - Dams
Chapter: [5.01] Management of Natural Resources
[5]16
[3]16.1

Write the steps involved in the extraction of pure metals in the middle of the activity series from their carbonate ores.

Concept: Occurrence of Metals - Extraction of Metals
Chapter: [1.02] Metals and Non Metals
[2]16.2

How is copper extracted from its sulphide ore? Explain the various steps supported by chemical equations. Draw labelled diagram for the electrolytic refining of copper.

Concept: Occurrence of Metals - Extraction of Metals
Chapter: [1.02] Metals and Non Metals
[5]17
[3]17.1

The modern periodic table has been evolved through the early attempts of Dobereiner, Newland and Mendeleev. List one advantage and one limitation or all the three attempts.

Concept: Early Attempts at the Classification of Elements - Dobereiner’s Triads
Chapter: [1.03] Periodic Classification of Elements
[2]17.2

Name the scientist who first of all showed that atomic number of an element is a more fundamental property than its atomic mass.

Concept: The Modern Periodic Table
Chapter: [1.03] Periodic Classification of Elements
[5]18 | attempt any one of the following
[5]18.1
[1]18.1.1

Mention any two components of blood.

Concept: Concept of Respiration
Chapter: [2.04] Life Processes
[2]18.1.2

Trace the movement of oxygenated blood in the body.

Concept: Concept of Respiration
Chapter: [2.04] Life Processes
[1]18.1.3

Write the function of valves present in between atria and ventricles.

Concept: Concept of Transportation
Chapter: [2.04] Life Processes
[1]18.1.4

Write one structural difference between the composition of artery and veins.

Concept: Concept of Transportation
Chapter: [2.04] Life Processes
[5]18.2
[1]18.2.1

Define excretion

Concept: Concept of Excretion
Chapter: [2.04] Life Processes
[1]18.2.2

Name the basic filtration unit present in the kidney.

Concept: Concept of Excretion
Chapter: [2.04] Life Processes
[3]18.2.3

Draw the well-labelled diagram of the human excretory system

Concept: Concept of Excretion
Chapter: [2.04] Life Processes
[5]19
[5]19.1
[3]19.1.1

Write the functions of the following parts in human female reproductive system:-

(i) Ovary

(ii) Oviduct

(iii) Uterus

Concept: Reproduction in Human Beings
Chapter: [2.02] Reproduction
[2]19.2

Describe the function of placenta.

Concept: Reproduction in Human Beings
Chapter: [2.02] Reproduction

Describe in brief the structure of placenta

Concept: Reproduction in Human Beings
Chapter: [2.02] Reproduction
[5]20 | attempt any one of the following
[5]20.1
[3]20.1.1

A student is unable to see clearly the words written on the black board placed at a distance of approximately 3 m from him. Name the defect of vision the boy is suffering from. State the possible causes of this defect and explain the method of correcting it.

Concept: Defects of Vision and Their Correction
Chapter: [3] Natural Phenomena
[2]20.1.2

What is atmospheric refraction? Use this phenomenon to explain the following natural events:

Twinkling of stars

Draw diagrams to illustrate your answers.

Concept: Atmospheric Refraction
Chapter: [3] Natural Phenomena
[5]20.2
[1]20.2.1

Write the function of the following part of the human eye: Cornea

Concept: Concept of Human Eye
Chapter: [3] Natural Phenomena
[1]20.2.2

Write the function of the following part of the human eye:- iris

Concept: Concept of Human Eye
Chapter: [3] Natural Phenomena
[1]20.2.3

Write the function of the following part of the human eye: crystalline lens

Concept: Concept of Human Eye
Chapter: [3] Natural Phenomena
[1]20.2.4

Write the function of the following part of the human eye: ciliary muscles

Concept: Concept of Human Eye
Chapter: [3] Natural Phenomena
[1]20.2.5

Why does the sun appear reddish early in the morning? Will this phenomenon be observed by an observer on the moon? Justify your answer with a reason.

Concept: Some Natural Phenomena Due to Sunlight
Chapter: [3] Natural Phenomena
[5]21
[1]21.1

State Fleming's left hand rule.

Concept: Fleming’s Left Hand Rule
Chapter: [4.01] Magnetic Effects of Current
[1]21.2

Principle of Electric motor

Concept: Electric Motor
Chapter: [4.01] Magnetic Effects of Current
[3]21.3
[1]21.3.1

Explain the function of the following parts of an electric motor.

Armature 

Concept: Electric Motor
Chapter: [4.01] Magnetic Effects of Current
[1]21.3.2

Explain the function of the following parts of an electric motor.

Brushes

Concept: Electric Motor
Chapter: [4.01] Magnetic Effects of Current
[1]21.3.3

Explain the function of the following parts of an electric motor.

Split ring

Concept: Electric Motor
Chapter: [4.01] Magnetic Effects of Current
[2]22

A student added few pieces of aluminium metal to two test tubes A and B containing aqueous solutions of iron sulphate and copper sulphate. In the second part of her experiment, she added iron metal to another test tubes C and D containing aqueous solutions of aluminium sulphate and copper sulphate.

In which test tube or test tubes will she observe colour change? On the basis of this experiment, state which one is the most reactive metal and why.

Concept: Metals and Nonmetals - Chemical Properties of Metals - Reactivity Series
Chapter: [1.02] Metals and Non Metals
[2]23

What is observed when a solution of sodium sulphate is added to a solution of barium chloride taken in a test tube? Write equation for the chemical reaction involved and name the type of reaction in this case.

Concept: Chemical Reactions - Types of Chemical Reactions - Double Displacement
Chapter: [1.05] Chemical Reactions
[2]24

List the steps of preparation of temporary mount of a leaf peel to observe stomata.

Concept: Nutrition - Autotrophic Nutrition
Chapter: [2.04] Life Processes
[2]25 | attempt any one of the following
[2]25.1

Name the process by which an Amoeba reproduces. Draw the various stages of its reproduction in a proper sequence.

Concept: Reproduction - Modes of Reproduction Used by Single Organisms - Fission
Chapter: [2.02] Reproduction
[2]25.2

A student in viewing under a microscope a permanent slide showing various stages of asexual reproduction by budding in yeast. Draw diagrams of what he observes (in proper sequence)

Concept: Reproduction - Modes of Reproduction Used by Single Organisms - Budding
Chapter: [2.02] Reproduction
[2]26

An object of height 4.0 cm is placed at a distance of 30 cm from the optical centre 'O' of a convex lens of focal length 20 cm. Draw a ray diagram to find the position and size of the image formed. Mark optical centre 'O' and principal focus 'F' on the diagram. Also find the approximate ratio of size of the image to the size of the object.

Concept: Refraction of Light - Image Formation by Lenses - Convex Lens
Chapter: [3] Natural Phenomena
[2]27

The values of current (I) flowing through a given resistor of resistance (R), for the corresponding values of potential difference (V) across the resistor are as given below:

V (volts) 0.5 1.0 1.5 2.0 2.5 3.0 4.0 5.0
 I (amperes) 0.1 0.2 0.3 0.4 0.5 0.6 0.8 1.0

Plot a graph between current (I) and potential difference (V) and determine the resistance (R) of the resistor.

Concept: Electric Potential Difference
Chapter: [4.02] Effects of Current

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