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Science and Technology - 1 2017-2018 SSC (English Medium) Class 10th Board Exam Question Paper Solution

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Science and Technology - 1
Marks: 40Academic Year: 2017-2018
Date & Time: 14th March 2018, 11:00 am
Duration: 2h

[10]1
[5]1.A
[2]1.A.i | Rewrite the following statements with suitable words in the blanks
[1]1.A.i.1

1 calorie =  _________ joule.

Concept: Electric Power
Chapter: [14] The Electric Spark
[1]1.A.i.2

The arrangement of elements in a group of three is known as ________.

Concept: Early Attempts at the Classification of Elements - Dobereiner’s Triads
Chapter: [2] Periodic Classification of Elements [11] School of Elements
[2]1.A.ii | State whether the following statements are true or false :
[1]1.A.ii.1

Pollen, Bacteria, Fungal spores are also pollutants.

Concept: Sources of Pollution and Major Pollutan - Air
Chapter: [18] Striving for better Environment 1
[1]1.A.ii.2

Magnetic lines of force always cross each other

Concept: Magnetic Force
Chapter: [15] All about Electromagnetism
[1]1.A.iii

Taking into consideration the relationship in the first pair, complete the second pair

2H2 + O2 → 2H2O :Combination Reaction :: 2HgO → 2Hg + O2:_________

Concept: Chemical Reactions - Types of Chemical Reactions - Decomposition
Chapter: [12] The Magic of Chemical Reactions
[5]1.B | Rewrite the following statements by Selecting the correct options
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[1]1.B.i

When crystals of copper sulphate are strongly heated, the residue obtained is ___________.

(A) red in colour

(B) blue in colour

(C) green in colour

(D) colourless

Concept: Chemical Reactions - Types of Chemical Reactions - Combination
Chapter: [12] The Magic of Chemical Reactions
[1]1.B.ii

Which type of mirror is used by a dentist?

Plane

Convex

Concave

Both Convex and Concave

Concept: Reflection of Light - Image Formation by Spherical Mirrors - Concave Mirror
Chapter: [16] Wonders of Light 1
[1]1.B.iii

The equivalent resistance of the parallel combination of two resistors of 60Ω and 40Ω is _______.

A) 24Ω

(B) 100Ω

(C) 50 Ω

(D) 240Ω

Concept: Resistance of a System of Resistors - Resistors in Parallel
Chapter: [14] The Electric Spark
[1]1.B.iv

The litmus paper or the litmus solution is obtained from ________ plant

(A) Moss

(B) Lichen

(C) Rose

(D) Hibiscus

Concept: Chemical Properties of Acids and Bases
Chapter: [13] The Acid Base Chemistry
[1]1.B.v

Which substance when used with butter having butyric acid can cure acidity?

(A) Lime water

(B) Soda water

(C) Calcium carbonate

(D) Lime juice

Concept: Acids, Bases and Their Reactivity
Chapter: [13] The Acid Base Chemistry
[10]2 | State any five of the following
[2]2.A

State Newlands‘ Law of Octaves.

Concept: Early Attempts at the Classification of Elements - Newlands’ Law of Octaves
Chapter: [2] Periodic Classification of Elements [11] School of Elements
[2]2.B

State the right-hand thumb rule.

Concept: Right-Hand Thumb Rule
Chapter: [15] All about Electromagnetism
[2]2.C

If a bulb of 60W is connected across a source of 220V, find the current drawn by it.

Concept: Electric Power
Chapter: [14] The Electric Spark
[2]2.D

Draw a neat and labelled diagram of the structure of the human eye

Concept: Concept of Human Eye
Chapter: [7] Lenses [16] Wonders of Light 1
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[2]2.E

Define Radius of curvature of the spherical mirror

Concept: Reflection of Light - Spherical Mirrors
Chapter: [16] Wonders of Light 1

Define the Focal length of a spherical mirror

Concept: Reflection of Light - Spherical Mirrors
Chapter: [16] Wonders of Light 1
[2]2.F

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: [17] Wonders of Light 2
[15]3 | Answer any five of the following
[3]3.A

Write the merits of the modern periodic table over Mendeleev’s Periodic table

Concept: The Modern Periodic Table
Chapter: [2] Periodic Classification of Elements [11] School of Elements
[3]3.B

Define ‘redox reaction’. Give one example.

Concept: Chemical Reactions - Types of Chemical Reactions - Oxidation and Reduction
Chapter: [3] Chemical Reactions and Equations [12] The Magic of Chemical Reactions
[3]3.C

What is Resistivity?

Concept: Ohm’s Law
Chapter: [14] The Electric Spark

Write the formula of resistivity

Concept: Ohm’s Law
Chapter: [14] The Electric Spark

Write the SI unit of resistivity

Concept: Ohm’s Law
Chapter: [14] The Electric Spark
[3]3.D

Distinguish Degradable pollutants - Non-degradable pollutants

Concept: Sources of Pollution and Major Pollutant - Soil
Chapter: [18] Striving for better Environment 1
[3]3.E

Kavita from 10th is using spectacles. The power of the lenses in her spectacles is –2.5 dioptre. Answer the following questions:

1) Which lenses are used in her spectacles?

2) State the defect of vision Kavita is suffering from.

3) Find the focal length of the lenses used in her spectacles

Concept: Refraction at Spherical Surfaces and by Lenses - Power of a Lens
Chapter: [16] Wonders of Light 1
[3]3.F

Write the chemical name of bleaching powder and write its properties.

Concept: Chemicals from Common Salt - Bleaching Powder
Chapter: [13] The Acid Base Chemistry
[5]4 | Answer any one of the following
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[5]4.A

Explain the construction and working of an electric motor.

Concept: Electric Motor
Chapter: [4] Effects of Electric Current [15] All about Electromagnetism
[5]4.B

What is refraction of light? 

Concept: Refraction of Light - Introduction
Chapter: [17] Wonders of Light 2

Draw the diagram of refraction of light in the glass slab

Concept: Refraction of Light - Refraction of Light Through a Glass Block and a Triangular Prism
Chapter: [17] Wonders of Light 2

State the laws of refraction of light. 

Concept: Refraction of Light - Refraction Through a Rectangular Glass Slab
Chapter: [17] Wonders of Light 2

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