# Science and Technology 1 Set 1 2018-2019 SSC (Marathi Semi-English) 10th Standard [इयत्ता १० वी] Question Paper Solution

Science and Technology 1 [Set 1]
Date & Time: 15th March 2019, 11:00 am
Duration: 2h

1) All questions are compulsory.
2) Draw scientifically, technically correct labelled diagrams wherever necessary.
3) Start writing each main question on new page.
4) Figures to the right indicate full marks.

[10]1
[5]1.A | Answer the following questions:
[1]1.A.i

Write proper answer in the box:

If "F" = ("G""m"_1"m"_2)/"d"^2                      then F = ______

Concept: Gravitation
Chapter: [0.01] Gravitation
[1]1.A.ii

In Dobereiner’s triads Li, Na, K, the atomic masses Lithium and Potassium are 6.9 and 39.1 respectively, then what will be the atomic mass of sodium.

Chapter: [0.02] Periodic Classification of Elements [0.11] School of Elements
[1]1.A.iii

State whether the given statement is true or false:
A concave lens is a converging lens.

True

False

Concept: Lenses
Chapter: [0.07] Lenses
[1]1.A.iv

By considering first correlation complete the second correlation :

Hubble telescope : 569 km high from earth surface Revolving orbit of Hubble telescope:

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

Find the odd man out:
Tinning, Anodization, Alloying, Froth floatation.

Concept: Corrosion of Metals and Its Prevention
Chapter: [0.03] Chemical Reactions and Equations [0.08] Metallurgy [0.08] Metallurgy
[5]1.B | Choose the correct alternative:
[1]1.B.i

The reaction of iron nail with copper sulphate solution is ......................... reaction.

Combination

Decomposition

Displacement

Double displacement

Concept: Types of Chemical Change or Chemical Reaction
Chapter: [0.03] Chemical Reactions and Equations
[1]1.B.ii

Observe the following diagram and choose the correct alternative :

The intensity of magnetic field in A is larger than in B.

The intensity of magnetic field in B is less than in A.

The intensity of magnetic field A and B is same.

The intensity of magnetic field in A is less than in B.

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

A ray of light makes an angle of 50° with the surface S1 of the glass slab. Its angle of incidence will be......................... .

50°

40°

140°

Concept: Laws of Refraction of Light
Chapter: [0.06] Refraction of Light
[1]1.B.iv

Water expands on reducing its temperature below .................... °C.

0

4

8

12

Concept: Latent Heat
Chapter: [0.05] Heat
[1]1.B.v

The carbon compound is used in daily life is .......................

Edible oil

Salt

Carbon dioxide

Baking soda

Concept: Bonding in Carbon - Covalent Bond
Chapter: [0.09] Carbon Compounds
[10]2 | Attempt any five.
[2]2.A

Two tungsten bulbs of power 50 W and 60 W work on 220 V potential difference. If they are connected in parallel, how much current will flow in the main conductor?

Concept: Energy Transfer in an Electric Circuit
Chapter: [0.04] Effects of Electric Current
[2]2.B

Give scientific reason :
In the electric equipment producing heat e.g. iron, electric heater, boiler, toaster, etc., an alloy such as Nichrome is used, not pure metals.

Concept: Effects of Electric Current - Heating Effect of Electric Current
Chapter: [0.04] Effects of Electric Current [0.14] The Electric Spark
[2]2.C

A metal ball of mass 5 kg falls from a height of 490 m. How much time it will take to reach the ground? (g = 9.8 m/s2)

Concept: Free Fall
Chapter: [0.01] Gravitation
[2]2.D

Write names of first four homologous series of alcohols

Concept: Homologous Series of Carbon Compound
Chapter: [0.09] Carbon Compounds
[2]2.E

Observe the following figure and complete the table

 Points Answer (i) Position of the object (ii) Position of the image (iii) Size of the image (iv) Nature of the image
Concept: Convex Lens
Chapter: [0.07] Lenses [0.16] Wonders of Light 1 [0.16] Wonders of Light 1
[2]2.F

Out of sodium and sulfur which is a metal ? Explain its reaction with the oxygen.

Concept: Classification of Change: Chemical Changes
Chapter: [0.03] Chemical Reactions and Equations
[2]2.G

A tapping vessel opens in a tank like container that is tapering on the lower side. The tank has an outlet for water on the upper side and a water inlet on the lower side. Finely ground ore is released in the tank. A forceful jet of water is introduced in the tank from lower side and gangue particles and pure ore are separated by this method.
1) The above description is of which gravitation separation method ?
2) Draw labelled diagram of this method.

Concept: Types of Separation Or Concentration of an Ore
Chapter: [0.08] Metallurgy
[15]3 |  Attempt any five
[3]3.A

What would be the value of ‘g’ on the surface of the earth if its mass was twice and its radius half of what it is now ?

Concept: Earth’s Gravitational Acceleration
Chapter: [0.01] Gravitation
[3]3.B

Write merits of Mendeleev’s periodic table.

Concept: Mendeleev’s Periodic Table
Chapter: [0.02] Periodic Classification of Elements [0.11] School of Elements
[3]3.C

Study the following chemical reaction and answer the questions given below :

$\ce{AgNO3_(_a_q_) + NaCl_(_a_q_)->\underset{\text{Precipitate}}{AgCl_(_s_)}↓ + NaNO3_(_a_q_)}$

1) Identify and write the type of chemical reaction.
2) Write the definition of above type of chemical reaction.
3) Write the names of reactants and products of above reaction.

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.D

Explain the following temperature Vs. time graph:

Concept: Latent Heat
Chapter: [0.05] Heat
[3]3.E

Surabhi from std. X uses spectacle. The powr of the lenses in her spectacle is 0.5 D. Answer the following questions from the given information
1) Identify the type of lenses used in her spectacle.
2) Identify the defect of vision Surabhi is suffering from.
3)Find the focal length of the lenses used in her spectacle.

Concept: Power of a Lens
Chapter: [0.07] Lenses [0.16] Wonders of Light 1
[3]3.F

Complete the following table:

 Sr.No Common name structural formula IUPAC Name 1 Ethylene CH2 =CH2 .............. 2 ............. CH3COOH Ethanoic acid 3 Methyl alcohol ......... Methanol
Concept: Nomenclature of Carbon Compounds
Chapter: [0.09] Carbon Compounds
[3]3.G

What is meant by space debris?

Concept: Space Missions
Chapter: [0.1] Space Missions
[5]4 | Attempt any one.
[5]4.A

Taking into consideration the period of the elements given below, answer the following questions :

 Elements Atomic Radius (pm) O 66 B 88 C 77 N 74 Be 111 Li 152

1) Arrange the above elements in a decreasing order of their atomic radii.
2) State the period to which the above elements belong.
3) Why this arrangement of elements period of modern periodic table ?
4) Which of the above elements have the biggest and the smallest atom?
5) What is the periodic trend observed in the variation of atomic radius while going from left to right within a period?

Concept: Periodic Properties
Chapter: [0.02] Periodic Classification of Elements [0.11] School of Elements
[5]4.B

The observation made by Swarali while doing the experiment are given below. Based on these write answers to the questions :
Swarali found that the light ray travelling from the denser medium to rarer medium goes away from the normal. If the angle of incidence (i) is raised by Swarali, the angle of refraction (r) went on increasing. However after certain value of the angle of incidence the light ray is seen to return back into the denser medium.
Questons:
1) What is the specific value of∠i called?
2) What is the process of reflection of incident ray into denser medium called?
3)Draw the diagrams of three observations made by Swarali.

Concept: Total Internal Reflection
Chapter: [0.06] Refraction of Light

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