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Science and Technology - 1 2014-2015 SSC (Marathi Semi-English) 10th Question Paper Solution

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Science and Technology - 1
Marks: 40Date: 2014-2015 March

[10]1
[5]1.1
[2]1.1.1 | Rewrite the following statements with suitable words in the blanks:
[1]1.1.1.1

The device used for producing electric current is called _________.

Concept: Electromagnetic Induction
Chapter: [15] All about Electromagnetism
[1]1.1.1.2

_________ the second layer of the atmosphere reaches 48 km above the Earth’s surface.

Concept: Effects of Air Pollution
Chapter: [18] Striving for better Environment 1
[2]1.1.2
  Column A   Column B
i eosin 1 losing hydrogen
ii oxidation 2 synthetic indicator
    3 losing oxygen
    4 natural indicator

 

Concept: Chemical Properties of Acids and Bases
Chapter: [13] The Acid Base Chemistry
[1]1.1.3

Give the molecular formula of bleaching powder.

Concept: Chemicals from Common Salt - Bleaching Powder
Chapter: [13] The Acid Base Chemistry
[5]1.2 | Rewrite the following statements by selecting the correct options :
[1]1.2.1

When phenolphthalein is added to NaOH, the colour of the solution will become _________.

  1. colourless
  2. red
  3. pink
  4. yellow
Concept: Chemical Properties of Acids and Bases
Chapter: [13] The Acid Base Chemistry
[1]1.2.2

If the potential difference across the ends of a conductor is 220 V and the resistance of the conductor is 44 Ω (ohm), then the current flowing through is _________.

  1. 0.2 A
  2. 0.5 A
  3. 2 A
  4. 5 A
Concept: Ohm’s Law
Chapter: [14] The Electric Spark
[1]1.2.3

1 A = _________ mA

  1. 102
  2. 103
  3. 10-3
  4. 10-6
Concept: Electric Current and Circuit
Chapter: [14] The Electric Spark
[1]1.2.4

The distance between principal focus and optical centre of the lens is _________.

  1. diameter
  2. focal length
  3. principal axis
  4. optical centre
Concept: Refraction of Light - Refraction by Spherical Lenses
Chapter: [16] Wonders of Light 1
[1]1.2.5

When rays of light are incident on a glass slab then the incident ray and emergent ray are _________ each other.

  1. perpendicular
  2. parallel
  3. opposite
  4. concurrent
Concept: Refraction of Light - Refraction Through a Rectangular Glass Slab
Chapter: [17] Wonders of Light 2
[10]2 | Solve any five of the following:
[2]2.1

Give scientific reason : Danger signals are red in colour.

Concept: Some Natural Phenomena Due to Sunlight
Chapter: [17] Wonders of Light 2
[2]2.2

Complete the following reaction, balance it and write the name of the products CuO + HCI →_________ + _________

Concept: Chemical Reactions - Types of Chemical Reactions - Double Displacement
Chapter: [12] The Magic of Chemical Reactions
[2]2.3

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]2.4

The velocity of light in a medium is 1.5 x 108 m/s. What is the refractive index of the medium with respect to air, if the velocity in air is 3 x 108 m/s?

Concept: Refraction of Light - Refractive Index
Chapter: [6] Refraction of Light [17] Wonders of Light 2
[2]2.5

Differentiate between resistances in series and parallel.

Concept: Resistance of a System of Resistors - Resistors in Parallel
Chapter: [14] The Electric Spark
[2]2.6

Draw a ray diagram for concave mirror when the object is between centre of curvature and focus.

Concept: Representation of Images Formed by Spherical Mirrors Using Ray Diagrams - Concave Mirror
Chapter: [16] Wonders of Light 1
[15]3 | Answer any five of the following :
[3]3.1

Explain the role of citizen in pollution control.

Concept: Abatement of Pollution
Chapter: [18] Striving for better Environment 1
[3]3.2

What is a spectrum?

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

Why do we get a spectrum of seven colors when white light is dispersed by a prism?

Concept: Refraction of Light - Refraction of Light Through a Glass Block and a Triangular Prism
Chapter: [17] Wonders of Light 2
[3]3.3

State four most common electrical appliances based on heating effect of electric current. Why do we use finely heated platinum wire in surgery?

Concept: Heating Effect of Electric Current
Chapter: [4] Effects of Electric Current [14] The Electric Spark
[3]3.4

Name the product obtained when Plaster of Paris is mixed with water. State the use of the product. Give two uses of POP.

Concept: Chemicals from Common Salt - Plaster of Paris
Chapter: [13] The Acid Base Chemistry
[3]3.5

Classify the following elements into metals, non-metals and metalliods

As, C, Hg, Mg, S, Si

Concept: Position of Elements and Trends in the Modern Periodic Table
Chapter: [11] School of Elements
[3]3.6
[1]3.6.1

Complete the following :-

(a)

Concept: Resistance of a System of Resistors - Resistors in Series
Chapter: [14] The Electric Spark
[1]3.6.2

Complete the following :-

(b)

Concept: Resistance of a System of Resistors - Resistors in Parallel
Chapter: [14] The Electric Spark
[1]3.6.3

Complete the following :-

(c)

Concept: Resistance of a System of Resistors - Resistors in Parallel
Chapter: [14] The Electric Spark
[5]4 | Answer any one of the following :
[5]4.1 | Often when electricity is used we come across electrical fires caused. Answer the following questions related to the following terms:
[1]4.1.1

When does short circuiting take place?

Concept: Domestic Electric Circuits
Chapter: [15] All about Electromagnetism
[1]4.1.2

What happens to the resistance of the circuit during a short circuit?

Concept: Domestic Electric Circuits
Chapter: [15] All about Electromagnetism
[1]4.1.3

What happens to the flow of electric current during a short circuit?

Concept: Domestic Electric Circuits
Chapter: [15] All about Electromagnetism
[1]4.1.4

What is overloading?

Concept: Domestic Electric Circuits
Chapter: [15] All about Electromagnetism
[1]4.1.5

How can the effects of overloading be avoided?

Concept: Domestic Electric Circuits
Chapter: [15] All about Electromagnetism
[5]4.2

In a Std. X class out of 40 students 10 students use spectacles, 2 students have positive power and 8 students have negative power of lenses in their spectacles.

Answer the following questions:

(1) What does the negative power indicate?

(2) What does the positive power indicate?

(3) Generally which type of spectacles do most of the students use?

(4) What defect of eyesight do most of the students suffer from?

(5) Give two possible reasons for the above defect.

Concept: Defects of Vision and Their Correction
Chapter: [16] Wonders of Light 1

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