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Science and Technology 1 2012-2013 SSC (English Medium) 10th Standard Board Exam Question Paper Solution

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Science and Technology 1
Marks: 30 Academic Year: 2012-2013
Date: March 2013
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[7] 1
[2] 1.1 | Fill in the blanks:
[1] 1.1.1

The chemical formula for rust is.............. .

Concept: Oxidation, Reduction and Redox Reactions
Chapter: [0.03] Chemical Reactions and Equations [0.12] The Magic of Chemical Reactions
[1] 1.1.2

The law used by Newlands to arrange elements is known as........... .

Concept: Newland's Law of Octaves
Chapter: [0.02] Periodic Classification of Elements [0.11] School of Elements
[2] 1.2 | State whether the following statements are true or false
[1] 1.2.1

The pH of rainwater is 7.

Concept: Strength of Acidic or Basic Solutions
Chapter: [0.13] The Acid Base Chemistry [0.13] The Acid Base Chemistry
[1] 1.2.2

The SI unit of charge is volt.

Concept: Electric Current
Chapter: [0.14] The Electric Spark
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[3] 1.3 | Rewrite the following table so as to match the second and third columns with the first column:
  Column I Column II Column III
1 Dispersion Long-sightedness Twinkling of stars
2 Refraction Splitting of white light into component colours Convex lens
3 Hypermetropia Change in the direction of the ray of light due to change in medium Spectrum of seven colours
Concept: Refraction of Light
Chapter: [0.06] Refraction of Light [0.17] Wonders of Light 2
[6] 2 | Answer the following questions:
[2] 2.1

Distinguish between Conductors and Insulators.

Concept: Electric Potential Difference
Chapter: [0.14] The Electric Spark
[2] 2.2

Why should the wires carrying electricity not be touched barefooted?

Concept: Household Electrical Circuits
Chapter: [0.15] All about Electromagnetism
[2] 2.3

Calculate the focal length of a corrective lens having power +2.5 D.

Concept: Power of a Lens
Chapter: [0.07] Lenses [0.16] Wonders of Light 1
[12] 3 | Answer the following questions (any four):
[3] 3.1

The atomic masses of three elements A, B and C having similar chemical properties are 7, 23 and 39, respectively.

  1. Calculate the average atomic mass of elements A and C.
  2. Compare the average atomic mass with atomic mass of B.
  3. What could the elements A, B and C be?
Concept: Periodic Properties
Chapter: [0.02] Periodic Classification of Elements [0.11] School of Elements
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[3] 3.2

When the substance ‘A’ is added to a solution of BaSO4, a yellow precipitate is formed.

  1. What do you think substance A is likely to be?
  2. Name the precipitate.
  3. Which type of reaction is this?
Concept: Types of Chemical Change or Chemical Reaction - Double Displacement Reaction
Chapter: [0.03] Chemical Reactions and Equations [0.12] The Magic of Chemical Reactions
[3] 3.3

A person has sour taste in the mouth and a burning sensation of the stomach.

  1. What is he suffering from?
  2. Why does it happen?
  3. What substance is used as a remedy?
Concept: Acids, Bases and Their Reactivity
Chapter: [0.13] The Acid Base Chemistry
[3] 3.4

Write any three properties of magnetic lines of force.

Concept: The Bar Magnet
Chapter: [0.15] All about Electromagnetism
[3] 3.5

Explain how the formation of a rainbow occurs.

Concept: Refraction of Light Through a Rectangular Glass Slab
Chapter: [0.06] Refraction of Light [0.17] Wonders of Light 2 [0.17] Wonders of Light 2
[5] 4 | Answer the following (any one):
[5] 4.1

What is myopia?

Concept: Eye Defect and Its Correction: Myopia Or Near-sightedness
Chapter: [0.07] Lenses [0.16] Wonders of Light 1

Explain two possible reasons of myopia. How can it be corrected? Explain with a suitable diagram.

Concept: Eye Defect and Its Correction: Myopia Or Near-sightedness
Chapter: [0.07] Lenses [0.16] Wonders of Light 1
[5] 4.2

Find the expression for resistors connected in series.

Concept: System of Resistors - Resistors in Series
Chapter: [0.14] The Electric Spark

Write any two characteristics of a series combination of resistors.

Concept: System of Resistors - Resistors in Series
Chapter: [0.14] The Electric Spark

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