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Question Paper Solutions - Science and Technology - 1 2014 - 2015-S.S.C-10th Maharashtra State Board (MSBSHSE)


Marks: 40
[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 _________.

Chapter: [4.01] Electromagnetic Induction
Concept: Electromagnetic Induction
[1]1.1.1.2

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

Chapter: [8] Striving for better Environment 1
Concept: Effects of Air Pollution
[2]1.1.2
  Column A   Column B
i eosin 1 losing hydrogen
ii oxidation 2 synthetic indicator
    3 losing oxygen
    4 natural indicator

 

Chapter: [3] The Acid Base Chemistry
Concept: Chemical Properties of Acids and Bases
[1]1.1.3

Give the molecular formula of bleaching powder.

Chapter: [1.02] Acids, Bases and Salts
Concept: Chemicals from Common Salt - Bleaching Powder
[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
Chapter: [3] The Acid Base Chemistry
Concept: Chemical Properties of Acids and Bases
[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
Chapter: [11] Current Electricity
Concept: Ohm’s Law
[1]1.2.3

1 A = _________ mA

  1. 102
  2. 103
  3. 10-3
  4. 10-6
Chapter: [4.01] Effects of Current
Concept: Electric Current and Circuit
[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
Chapter: [6] Wonders of Light 1
Concept: Refraction of Light - Refraction by Spherical Lenses
[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
Chapter: [7] Wonders of Light 2
Concept: Refraction of Light - Refraction Through a Rectangular Glass Slab
[10]2 | Solve any five of the following:
[2]2.1

Give scientific reason : Danger signals are red in colour.

Chapter: [7] Wonders of Light 2
Concept: Some Natural Phenomena Due to Sunlight
[2]2.2

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

Chapter: [1.01] Chemical Reactions
Concept: Chemical Reactions - Types of Chemical Reactions - Double Displacement
[2]2.3

State Newlands‘ Law of Octaves.

Chapter: [1.05] Periodic Classification of Elements
Concept: Early Attempts at the Classification of Elements - Newlands’ Law of Octaves
[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?

Chapter: [3] Natural Phenomena
Concept: Refraction of Light - Refractive Index
[2]2.5

Differentiate between resistances in series and parallel.

Chapter: [4.01] Effects of Current
Concept: Resistance of a System of Resistors - Resistors in Parallel
[2]2.6

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

Chapter: [6] Wonders of Light 1
Concept: Representation of Images Formed by Spherical Mirrors Using Ray Diagrams - Concave Mirror
[15]3 | Answer any five of the following :
[3]3.1

Explain the role of citizen in pollution control.

Chapter: [8] Striving for better Environment 1
Concept: Abatement of Pollution
[3]3.2

What is a spectrum?

Chapter: [7] Wonders of Light 2
Concept: Refraction of Light - Refraction of Light Through a Glass Block and a Triangular Prism

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

Chapter: [7] Wonders of Light 2
Concept: Refraction of Light - Refraction of Light Through a Glass Block and a Triangular Prism
[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?

Chapter: [4] The Electric Spark
Concept: Heating Effect of Electric Current
[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.

Chapter: [1.02] Acids, Bases and Salts
Concept: Chemicals from Common Salt - Plaster of Paris
[3]3.5

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

As, C, Hg, Mg, S, Si

Chapter: [1.05] Periodic Classification of Elements
Concept: Position of Elements and Trends in the Modern Periodic Table
[3]3.6
[1]3.6.1

Complete the following :-

(a)

Chapter: [4] The Electric Spark
Concept: Resistance of a System of Resistors - Resistors in Series
[1]3.6.2

Complete the following :-

(b)

Chapter: [4.01] Effects of Current
Concept: Resistance of a System of Resistors - Resistors in Parallel
[1]3.6.3

Complete the following :-

(c)

Chapter: [4.01] Effects of Current
Concept: Resistance of a System of Resistors - Resistors in Parallel
[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?

Chapter: [4.02] Magnetic Effects of Current
Concept: Domestic Electric Circuits
[1]4.1.2

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

Chapter: [4.02] Magnetic Effects of Current
Concept: Domestic Electric Circuits
[1]4.1.3

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

Chapter: [4.02] Magnetic Effects of Current
Concept: Domestic Electric Circuits
[1]4.1.4

What is overloading?

Chapter: [4.02] Magnetic Effects of Current
Concept: Domestic Electric Circuits
[1]4.1.5

How can the effects of overloading be avoided?

Chapter: [4.02] Magnetic Effects of Current
Concept: Domestic Electric Circuits
[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.

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