SSC Maharashtra Board Science 1 Question Paper 2020 with Solutions

Maharashtra Board SSC Class 10 Science 1 Question Paper 2020 with Solutions Answers Pdf Download.

SSC Science 1 Question Paper 2020 with Solutions Pdf Download Maharashtra Board

Time : 2 Hours
Max. Marks : 50

Note:

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 answer.
   For Eg :
   1. (A),
   2. (B),
   3. (C)
6. Scientifically correct, labelled diagrams should be drawn wherever necessary.

1. (A) Write the correct alternative : [5]

Question 1.
According to Mendeleev’s periodic law, properties of elements are periodic function of their …………..
(A) Atomic number
(B) Atomic masses
(C) Densities
(D) Boiling points
Answer:
(B) Atomic masses

Question 2.
The vapour content in the air is measured using a physical quantity called
(A) Absolute humidity
(B) Relative humidity
(C) Dewpoint
(D) Humidity
Answer:
(A) Absolute humidity.

Question 3.
For the normal human eye, the near point is at …… cm.
(A) 10
(B) 20
(C) 25
(D) 30
Answer:
(C) 25

Question 4.
The astronomical object closest to us is …….. is our galaxy.
(A) Mars
(B) Venus
(C) Jupiter
(D) Moon
Answer:
(D) Moon

Question 5.
In the Wilfley table method, the particles of gangue are separated by …….. separation method.
(A) Magnetic
(B) Froth floatation
(C) Hydraulic
(D) Gravitational
Answer:
(D) Gravitational

(B) Answer the following : [5]

Question 1.
Find the odd one out:
Voltmeter, Ammeter, Thermometer, Galvanometer.
Answer:
Thermometer is odd.

Question 2.
Complete the correlation :
Alkene : C = C :: Alkyne : ………
Answer:
Alkene : C = C :: Alkyne : C ≡ C

Question 3.
State true or false :
The frequency of AC is 50 Hz.
Answer:
True.

Question 4.
Match the Columns :

Column ‘A’	Column ‘B’
The wavelength of red light	(a) 600 nm
	(b) 700 nm
	(c) 500 nm

Answer:
The wavelength of red light is (b) 700 nm

Question 5.
Name the first artificial satellite sent by Russia in space.
Answer:
Sputnik.

2. (A) Give scientific reasons (any two): [4]

Question 1.
The weight of an object changes from place to place though its mass is constant.
Answer:
The weight of an object changes from place to place though its mass is constant
(1) The weight of an object is defined as the force with which the earth attracts the object i.e. weight, W = mg where ‘g’ is the acceleration due to gravity. The value of ‘g’ is not the same everywhere on the earth, it changes from place to place. Hence, though mass of an object is constant everywhere, its weight changes from place to place.

Question 2.
Stars twinkle but we do not see the twinkling of planets.
Answer:
Stars twinkle, but we do not see the twinkling of planets.

Due to the motion of atmospheric air, changing air density and temperature, the apparent position of the star keeps changing a bit. Thus, the refractive index of air keeps on changing continuously. so, the position and brightness of the star keep changing continuously and hence the star appears to be twinkling. On the other hand, planets are much closer to us as compared to stars.

So, they do not appear as point sources. They appear as a collection of point sources. Due to the changes in atmospheric refractive index, the position as well as the brightness of individual point source change but the average position and total average brightness remains unchanged. Hence, planets do not twinkle.

Question 3.
Elements belonging to the same group have the same valency.
Answer:
The valency of an element is determined by the number of valence electrons in the outermost shell of an atom of an element. All the elements in a group have the same number of valence electrons. Therefore, elements in the same group have the some valency.

(B) Answer the following (any three): [6]

Question 1.
How much heat energy is necessary to raise the temperature of 5 kg of water from 20°C to 100°C?
Answer:
Given data : Mass of water (m) = 5 kg.
Change in temperature (∆T) = 100 – 20 = 80°C
c = 1 kcal/kg°C.

Calculation:
Energy to be supplied to water = Energy gained by water
= Mass of water × specific heat of water × change in temperature of water = m × c × ∆T
= 5 × 1 × 80
= 400 k cal.
∴ Heat energy necessary to raise the temperature of water is 400 k cal.

Question 2.
Observe the given figure of Fleming’s Right Hand Rule and write the labels of A and B correctly.

Answer:
(A) Direction of the magnetic field.
(B) Direction of the induced current.

Question 3.
Observe the giver graph and answer the following questions:

(a) Name the process represented in the figure.
(b) At what temperature does this process take place ?
Answer:
(a) The process represented in figure is Anomalous behaviour of water.
(b) This process takes place from 4°C to 0°C

Question 4.
Complete the given chemical reaction :
CuSO₄ (aq) + Fe (s) → ……… + …………
Name the type of the reaction.
Answer:
CuSO₄(aq) + Fe(S) → FeSO₄aq + Cu(s)
The reaction is displacement reaction.

Question 5.
Write a short note on Alloying.
Answer:

1. An alloy is the homogenous mixture formed by mixing a metal with other metals or non-metals in a certain proportion and the process of making an alloy is called alloying.
2. The main intention behind the alloying is to decrease the intensity of corrosion of metals.
3. For example : Bronze is an alloy made from 90% copper and 10% tin. Statues made up of bronze are not affected by sun and rain.
4. Stainless steel is an alloy formed from 74% iron, 18% chromium and 8% carbon. Stainless steel does not get stains with air or water and also it does not rust.
5. In recent times, for mining coins, various types of alloys are used.

3. Answer the following (any five): [15]

Question 1.
An element has its electronic configuration as 2, 8, 2. Now answer the following questions:
(a) What is the atomic number of this element ?
(b) What is the group of this element ?
(c) To which period does this element belong ?
Answer:
(a) Atomic number of the element with electronic configuration 2, 8, 2 is 12. (The element is Magnesium).
(b) Number of electrons in the outermost shell is 2. So, the element belongs to Group 2.
(c) The element has 3 shells in its electronic configuration. Hence, it belongs to period 3.

Question 2.
Observe the given figure showing the orbit of a planet moving around the Sun and write the three laws related to it:

Answer:
The laws related to the given figure are Kepler’s laws.

(1) Kepler’s first law : The orbit of a planet is an ellipse with the sun at one of the foci. The given figure shows an elliptical orbit of a planet revolving around the sun. In the figure S indicates the position of the sun.

(2) Kepler’s second law : The line joining the planet and the sun sweeps equal areas in equal intervals of time.
In the figure AB and CD are the distances covered by the planet in equal time. The straight lines AS and CS sweep equal area in equal interval of time. That is, area ASB and area CSD are equal.

(3) Kepler’s third law : The square of its period of revolution around the sun is directly proportional to the cube of the mean distance of a planet from the sun.
If r is the mean distance of the planet from the sun and T is its period of revolution then.
T² ∝ r³
∴ \(\frac{\mathrm{T}^2}{r^3}\) = constant

Question 3.
Read the given passage and answer the following questions :

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.
(a) Name the two wires having potential difference of 220 V. A.
(b) What is short circuit ?
(c) Write the function of a fuse.
Answer:
(a) The ‘live’ and the ‘neutral’ wires have potential difference of 220 V.

(b) Due to a fault in the equipment or if the plastic coating on the ’live’ and the ‘neutral1 wires gives away, then the two wires come in contact with each other and a large current flows circuit through it producing heat. This is called as short circuit. If any inflammable material (such”as wood, cloth, plastic, etc.) exists around that place, it can catch fire.

(c) Fuse wire is used as precautionary measure. As soon as high current flows in a circuit, the fuse wire melts and breaks the circuit and any mishap is avoided.

Question 4.
Observe the given figure and answer the following questions :

(a) Name the process represented by the figure.
(b) State the two laws related to the process.
Answer:
(a) The given figure represents refraction.

(b) Laws of refraction :

(1) Incident ray and the refracted ray at the point of incidence N are on the opposite sides of the normal to the surface of the slab at that point i.e. CD, and the three the incident ray, refracted ray and the normal are in the same plane.

(2) For a given pair of media, (here air and glass), the ratio of (sin i) to (sin r) is constant, where T is the angle of incidence and V is the angle of refraction.

Question 5.
What is an artificial satellite ? Name any two types of artificial satellite and state their functions.
Answer:

(1) If a manmade object revolves around the earth or any other planet in a fixed orbit, it is called an artificial satellites :

(2) The two types of artificial satellites.
(a) Weather satellite : Its function is to study and to prediction of weather.
(b) Broadcast satellite : Its function is to telecast television programs.

Question 6.
Answer the following questions :
(a) Define Hydrocarbons.
(b) Name the types of Hydrocarbons.
(c) Name two carbon compounds used in day-to-day life.
Answer:
(a) The compounds which contain carbon and hydrogen as the only two elements are called hydrocarbons.

(b) Types of hydrocarbons are saturated hydrocarbons and unsaturated hydrocarbons. Unsaturated hydrocarbons have double or triple bond between the carbon atoms unlike the saturated hydrocarbons in which all hydrogen atoms and carbon atoms are bonded together with single bonds. Both these types are further classified as straight chain hydrocarbons, branched chain hydrocarbons and cyclic hydrocarbons.

(c)

1. Polythene [(CH₂ = CH₂)_n] is used in production of carry bags and sports wear.
2. Polyvinyl chloride (PVC) is used in manufacture of PVC pipes, door mats, tubes and bags in hospital kits.

Question 7.
Observe the given figure of reactivity series of metals and answer the following questions :

(a) Name two metals which react with water.
(b) Name two moderately reactive metals.
(c) Name the most highly reactive metal and the most less reactive metal.
Answer:
(a) Sodium and calcium react with water.
(b) Aluminium and zinc are the moderately reactive metals.
(c) The most highly reactive metal is Potassium and the most less reactive metal is Gold.

Question 8.
Complete the following table :

Answer:

4. Answer any one of the following : [5]

Question 1.
Draw a scientifically correct labelled diagram of a human eye and answer the questions based on it:
(a) Name the type of lens in the human eye.
(b) Name the screen at which the maximum amount of incident light is refracted ?
(c) State the nature of the image formed of the object on the screen inside the eye.
Answer:

(a) Lens in the human eye is double convex transparent crystalline lens.
(b) Maximum amount of incident light is refracted inside the eye at the outer surface of the cornea.
(c) The image of the object formed on the screen inside the eye is real and inverted.

Question 2.
Observe the following picture and answer the following questions :

(a) What is a rust ?
(b) Write the chemical formula of rust.
(c) Write the reaction of oxidation of iron at anode.
(d) Write the reaction of oxidation of iron at cathode.
(e) What is corrosion ?
Answer:
(a) A certain type of reddish coloured solid layer which collects on the surface of the metals usually ferrous metals when it reacts with oxygen and water. This layer is called rust.

(b) Chemical formula of rust is Fe₂C₃.H₂O

(c) Iron (Fe) is oxidised to Fe²⁺ in the anode region.
Fe (s) → Fe²⁺ (aq) + 2e^–

(d) O₂ is reduced to form water in the cathode region.
O₂ (g) + 4H⁺ (aq) + 4e^– → 2H₂O(l)
When Fe²⁺ ions migrate from the anode region, they react with water and further get oxidised to form Fe³⁺ ions.

(e) Due to various components of atmosphere, oxidation of metals takes place, consequently resulting in their damage. This is called corrosion.

SSC Maharashtra Board Science 1 Question Paper with Solutions