Science and Technology 1 Set 1 2019-2020 SSC (Marathi Semi-English) 10th Standard [इयत्ता १० वी] Question Paper Solution

Science and Technology 1 [Set 1]
Date & Time: 16th March 2020, 11:00 am
Duration: 2h
1. All questions are compulsory.
2. Use of a calculator is not allowed.
3. The numbers to the right of the questions indicate full marks.
4. In case of MCQs (Q. No. 1(A)) only the first attempt will be evaluated and will be given credit.
5. For each MCQ, the correct alternative (A), (B), (C), (D) with sub-question number is to be written as an answer.
For Eg: (i) (A), (ii) (B), (iii) (C)
6. Scientifically correct, labelled diagrams should be drawn wherever necessary.

[10]1
[5]1.A | Write the correct alternative:
[1]1.A.i

According to Mendeleev’s periodic law, properties of elements are periodic function of their _______.

Atomic numbers

Atomic masses

Densities

Boiling points

Concept: Mendeleev’s Periodic Table
Chapter: [0.02] Periodic Classification of Elements [0.11] School of Elements
[1]1.A.ii

The vapour content in the air is measured using a physical quantity called ____________.

Absolute humidity

Relative humidity

Dew point

Humidity

Concept: Dew Point and Humidity
Chapter: [0.05] Heat
[1]1.A.iii

For the normal human eye, the near point is at ___________ cm.

10

20

25

30

Concept: Human Eye: Structure of the Eye
Chapter: [0.07] Lenses [0.16] Wonders of Light 1
[1]1.A.iv

The astronomical object closest to us is _________ is our galaxy.

Mars

Venus

Jupiter

Moon

Concept: Moon Missions
Chapter: [0.1] Space Missions
[1]1.A.v

In the Wilfley table method, the particles of gangue are separated by __________ separation method.

Magnetic

Froth floatation

Hydraulic

Gravitational

Concept: Types of Separation Or Concentration of an Ore
Chapter: [0.08] Metallurgy
[1]1.B.i

Find the odd one out:

Voltmeter

Ammeter

Thermometer

Galvanometer

Concept: Effects of Electric Current - Magnetic Effect of Electric Current
Chapter: [0.04] Effects of Electric Current
[1]1.B.ii

Complete the correlation:

Alkene : C = C :: Alkyne: _______.

Concept: Carbon: a Versatile Element - Homologous Series of Carbon Compound
Chapter: [0.09] Carbon Compounds
[1]1.B.iii

State true or false:

The frequency of AC is 50 Hz.

True

False

Concept: Alternating Current (A.C.) Generator
Chapter: [0.04] Effects of Electric Current [0.15] All about Electromagnetism
[1]1.B.iv

Match the Columns:

 Column ‘A’ Column ‘B’ The wavelength of red light (a) 600 nm (b) 700 nm (c) 500 nm
Concept: Dispersion of Light
Chapter: [0.06] Refraction of Light
[1]1.B.v

Name the first artificial satellite sent by Russia in space.

Concept: Orbits of Artificial Satellites
Chapter: [0.1] Space Missions
[10]2
[4]2.A | Give scientific reasons (any two):
[2]2.A.i

The weight of an object changes from place to place through its mass is constant.

Concept: Concept of Weight
Chapter: [0.01] Gravitation
[2]2.A.ii

Write scientific reason.

Stars twinkle but we do not see the twinkling of planets.

Concept: Twinkling of Stars
Chapter: [0.06] Refraction of Light
[2]2.A.iii

Elements belonging to the same group have the same valency.

Concept: Types of Element: Metals
Chapter: [0.02] Periodic Classification of Elements [0.08] Metallurgy [0.08] Metallurgy
[6]2.B | Answer the following (any three):
[2]2.B.i

How much heat energy is necessary to raise the temperature of 5 kg of water from 20°C to 100°C?

Concept: Specific Heat Capacity
Chapter: [0.05] Heat
[2]2.B.ii

Observe the given figure of Fleming’s Right Hand Rule and write the labels of A and B correctly.

Concept: Fleming’s Right Hand Rule
Chapter: [0.04] Effects of Electric Current
[2]2.B.iii

Observe the given graph and answer the following questions:

1. Name the process represented in the figure.
2. At what temperature does this process take place?
Concept: Anomalous behaviour of water
Chapter: [0.05] Heat
[2]2.B.iv
• Complete the given chemical reaction:
$\ce{CuSO4_{(aq)} + Fe_{(s)} ->}$ _______ + _______
• Name the type of the reaction.
Concept: Types of Chemical Reactions - Single Displacement Reactions
Chapter: [0.03] Chemical Reactions and Equations [0.12] The Magic of Chemical Reactions
[2]2.B.v

Write a short note on Alloying.

Concept: Corrosion of Metals and Its Prevention
Chapter: [0.03] Chemical Reactions and Equations [0.08] Metallurgy [0.08] Metallurgy
[15]3 | Answer the following (any five):
[3]3.A

An element has its electron configuration as 2, 8, 2. Now answer the following question.

What is the atomic number of this element?

Concept: Modern Periodic Table and Electronic Configuration of Elements
Chapter: [0.02] Periodic Classification of Elements

An element has its electron configuration as 2, 8, 2. Now answer the following question.

What is the group of this element?

Concept: Modern Periodic Table and Electronic Configuration of Elements
Chapter: [0.02] Periodic Classification of Elements

An element has its electron configuration as 2, 8, 2. Now answer the following question.

To which period does this element belong?

Concept: Modern Periodic Table and Electronic Configuration of Elements
Chapter: [0.02] Periodic Classification of Elements
[3]3.B

Observe the given figure showing the orbit of a planet moving around the Sun and write the three laws related to it:

The orbit of a planet moving around the Sun

Concept: Kepler’s Laws
Chapter: [0.01] Gravitation
[3]3.C

The home electrical connection consists of ‘live’, ‘neutral’ and ‘earth’ wires. The ‘live’ and the ‘neutral’ wires have potential difference of 220 V. The ‘earth’ is connected to ground. Due to a fault in the equipment or if the plastic coating on the ‘live’ and the ‘neutral’ wires gives a way the two wires come in contact with each other and a large current flows through it producing heat. If any inflammable material (such as wood, cloth, plastic, etc.) exists around that place it can catch fire. Therefore a fuse wire is used as a precautionary measure.

1. Name the two wires having potential difference of 220 V.
2. What is a short circuit?
3. Write the function of a fuse.
Concept: Effects of Electric Current - Magnetic Effect of Electric Current
Chapter: [0.04] Effects of Electric Current
[3]3.D

Observe the given figure and answer the following questions:

1. Name the process represented by the figure.
2. State the two laws related to the process.
Concept: Laws of Refraction of Light
Chapter: [0.06] Refraction of Light
[3]3.E

What is meant by an artificial satellite? How are the satellites classified based on their functions?

Concept: Satellites
Chapter: [0.1] Space Missions
[3]3.F | Answer the following questions:

Define Hydrocarbons.

Concept: Functional Groups in Carbon Compounds
Chapter: [0.09] Carbon Compounds

Name the types of Hydrocarbons.

Concept: Bonding in Carbon - Covalent Bond
Chapter: [0.09] Carbon Compounds

Name two carbon compounds used in day-to-day life.

Concept: Bonding in Carbon - Covalent Bond
Chapter: [0.09] Carbon Compounds
[3]3.G

Observe the given figure of reactivity series of metals and answer the following questions:

Reactivity series of metals

1. Name two metals which react with water.
2. Name two moderately reactive metals.
3. Name the most highly reactive metal and the most less reactive metal.
Concept: Reactivity Series of Metals
Chapter: [0.08] Metallurgy
[3]3.H

Complete the following table:

 Straight chain of Carbon compounds Structural formula Molecular formula Name C $\begin{array}{cc}\ce{H}\\|\\\ce{H - C - H}\\|\\\ce{H}\end{array}$ CH4 Methane C-C ______ ______ Ethane C-C-C ______ C3H8 ______ C-C-C-C $\begin{array}{cc}\ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H}\\|\phantom{....}|\phantom{....}|\phantom{....}|\\\ce{H - C - C - C - C - H}\\|\phantom{....}|\phantom{....}|\phantom{....}|\\\ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H}\end{array}$ ______ ______
Concept: Carbon: a Versatile Element - Nomenclature of Carbon Compounds
Chapter: [0.09] Carbon Compounds
[5]4 | Answer any one of the following:
[5]4.A

Draw a scientifically correct labelled diagram of a human eye and answer the questions based on it:

1. Name the type of lens in the human eye.
2. Name the screen at which the maximum amount of incident light is refracted?
3. State the nature of the image formed of the object on the screen inside the eye.
Concept: Human Eye: Structure of the Eye
Chapter: [0.07] Lenses [0.16] Wonders of Light 1
[5]4.B

Observe the following picture and answer the following questions:

1. What is rust?
2. Write the chemical formula of rust.
3. Write the reaction of oxidation of iron at the anode.
4. Write the reaction of oxidation of iron at the cathode.
5. What is corrosion?
Concept: Corrosion of Metals and Its Prevention
Chapter: [0.03] Chemical Reactions and Equations [0.08] Metallurgy [0.08] Metallurgy

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