Maharashtra Board Class 10 Science 1 Sample Paper Set 4 with Answers

Maharashtra Board SSC Class 10 Science 1 Sample Paper Set 4 with Answers Solutions Pdf Download.

Maharashtra Board Class 10 Science 1 Model Paper Set 4 with Answers

Time: 2 Hours
Total Marks: 40

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) or (D) with subquestion 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.

Question 1.
(A) Choose the correct alternative. [5]
i. Heating effect of electric current is not observed in __________. (C)
(A) electric oven
(B) electric iron
(C) electric motor
(D) fuse
Answer:
(C) electric motor

ii. In cold countries in winter, water carrying pipes sometimes break, because __________. (D)
(A) Volume of water reduces if the temperature is reduced below 0 °C.
(B) air pressure increases.
(C) the steel pipes become brittle due to reduced temperature below 0 °C.
(D) Volume of water increases if the temperature is reduced below 0 °C.
Answer:
(D) Volume of water increases if the temperature is reduced below 0 °C.

iii. There are __________ attached on the both sides of an artificial satellite as wings. (A)
(A) Solar photovoltaic cells
(B) fuel tanks
(C) motors
(D) cameras
Answer:
(A) Solar photovoltaic cells

iv. According to Newton’s law of gravitation, for two objects kept at a distance d from each other, if the distance between the objects is doubled, then the force between the two objects __________ . (B)
(A) increases by a factor of 4
(B) decreases by a factor of 4
(C) decreases by a factor of 2
(D) increases by a factor of 2
Answer:
(B) decreases by a factor of 4

v. Which one of the following does not increase while moving down the group of the modem periodic table? (C)
(A) Atomic radius
(B) Metallic character
(C) Valence electrons
(D) Number of shells
Answer:
(C) Valence electrons

(B) Answer the following. [5]
i. Find odd one out.
Mass, weight, gravitational acceleration, gravitational force.
ii. Match the symbols of column I to their names in column II.

iii. Write if given statement is true or false. Correct the statement if false and rewrite. Simple microscope is used for watch repairs.
iv. Complete the analogy:
0°C : Melting point of ice :: 100 °C : __________.
v. Write the formula of the product formed when ammonia gas reacts with hydrogen chloride gas.
Answer:
i. Mass
ii.

(Note: In ‘Make pairs’, students are expected to write the answer in tabular format.)
iii. True
iv. 0 °C : Melting point of ice :: 100 °C : Boiling point of water
v. NH₄Cl
(Note: In ‘Give molecular formula’ students are expected to write only the molecular formula.)

Question 2.
(A) Give scientific reasons. (Attempt any 2) [4]
i. There is a need to manage space debris.
ii. For electric power transmission, copper or aluminium wire is used.
iii. It takes time for pieces of Shahabad tile to disappear in HC1, but its powder disappears rapidly.
(B) Answer the following. (Attempt any 3) [6]
i. Write names of first four members of the homologous series of alkenes:

ii. Write short note on given diagram.

iii. State the demerits of Mendeleev’s periodic table.
iv. Distinguish between: High earth orbits and low earth orbits.
v. Two concave lenses, each of focal length 60 cm are placed in contact with each other. Find the power of the combination.
Answer:
i. Space debris:
In space non-essential objects revolving around the earth are termed as the debris in space. Reasons behind space-debris management:
a. Space debris can be harmful to the artificial satellites.
b. It can collide with these satellites or spacecrafts and damage them.
c. As a result, the future of artificial satellites or spacecrafts are in danger.
d. It also makes difficult to launch new spacecrafts or artificial satellite.

ii. a. Copper and aluminium contain large number of free electrons.
b. These free electrons can move throughout conductor easily.
c. This results into copper and aluminium having low values of resistivity.
d. Thus, copper and aluminium are good conductors of electricity and offer low resistance to the flow of current.
Hence, aluminium and copper are used for electric power transmission.

iii. a. The rate of a chemical reaction depends upon the size of the reactant particles taking part in the reaction.
b. Smaller the size of the reactant particles, higher is the rate of reaction.
c. The size of reactant particles is more in pieces of Shahabad tile as compared to powder of Shahabad tile.
d. When HCl is added to pieces of Shahabad tile, the CO₂ effervescence is formed slowly.
Hence, it takes time for pieces of Shahabad tile to disappear in HCl, but its powder disappear rapidly.

(B) i.

ii. a. In summer, the air near the hot road or desert surface has very high temperature and hence it becomes lighter than the cool air above it.
b. As, the density of air goes on decreasing with increase in height above the surface, the refractive index of air increases.
c. Hence, the direction of light rays coming from a distant object keeps changing according to laws of refraction.
d. This makes the light rays coming from distant object appear to come from an image of the object inside the ground as shown in the figure. This is called mirage.
e. Thus, formation of mirage is the effect of changing refractive index in the atmosphere.
f. An illusion of the appearance of water on a hot road or in a desert is an example of mirage.

iii. Demerits of Mendeleev’s periodic table:
a. The whole number atomic mass of the elements cobalt (Co) and nickel (Ni) is the same, that is, 59. Therefore, there was an ambiguity regarding the sequence of these elements in the Mendeleev’s periodic table.
b. Isotopes were discovered long time after Mendeleev developed the periodic table. Isotopes have same chemical properties but different atomic masses. Therefore, isotopes could not be given a proper place in Mendeleev’s periodic table.
c. In Mendeleev’s periodic table, elements are arranged in an increasing order of atomic masses. However, the rise in atomic mass is not uniform. Hence, it was not possible to predict the number of elements that could be discovered between two heavy elements.
d. No fixed position was given to hydrogen in Mendeleev’s periodic table because it resembled alkali metals (group I) as well as halogens (group VII).

iv.

High earth orbits	Low earth orbits
a. Height from the earth’s surface for these orbits is greater than or equal to 35780 km.	Height from the earth’s surface for these orbits is between 180 km and 2000 km.
b. Satellites revolving in these orbits take around 24 hours to complete one revolution around the earth.	Satellites revolving in these orbits take around 90 minutes to complete one revolution around the earth.
c. The satellites revolving in these orbits appear stationary with respect to earth.	The satellites revolving in these orbits do not appear stationary with respect to earth.
d. Satellites revolving in these orbits can be used for carrying signals for telephone, television etc. and also in the applications like meteorology.	Satellites revolving in these orbits can be used for scientific experiments and atmospheric studies.
Examples: Geostationary satellites revolving parallel to equator of the earth revolve in these orbits.	Examples: International space station and Hubble telescope revolve in these orbits.

 

v. Solution:

Question 3.
Answer the following. (Attempt any 5) [15]
i. An object thrown vertically upwards reaches a height of 320 m. What was its initial velocity?
How long will the object take to come back to the earth? Assume g = 10 m/s².
ii. Label the parts of the following diagram of the human eye and state the functions of those parts.

iii. What is meant by electroplating? Which other measures would you suggest to stop the corrosion of metallic articles or not to allow the corrosion to start?
iv. An electric iron of 1100 W is operated for 2 hrs daily. What will be the electrical consumption expenses for that in the month of April? (Th6 electric company charges Rs 5 per unit of energy.)
v. Explain the term reactant and product giving examples.
vi. Take 3 spheres of iron, copper and lead of equal mass.
Put all the 3 spheres in boiling water in a beaker for specific time.
Take 3 spheres out of the water. Put them immediately on a thick slab of wax.
Note the depth that each sphere goes into the wax.

a. Which property of substance can be studied with this procedure?
b. Describe that property in minimum words.
c. Explain the rule of heat exchange with this property.
vii. Identify and name the process or method involved in each of the following metallurgical process:
a. A sulphide ore of a metal is converted to metal oxide by heating in excess of air.
b. The method used for concentration of zinc sulphide ore using water and pine oil.
c. A powdered ore is treated with certain reagent in which the ore is soluble due to chemical reaction, but the gangue is not soluble.
d. The pure alumina obtained from bauxite ore is electrolyzed to obtain metallic aluminium.
e. Zinc carbonate is heated strongly in limited supply of air to convert it to oxide.
f. The method used for concentration of cassiterite, an ore of tin.
viii. Complete the following table.

Answer:
i. Solution:
Given: Height (s) = 320 m,
acceleration due to gravity (g) = 10 m/s²
To find: a. Initial velocity (u),
b. Total time taken
Formulae: a. v² = u² + 2 as
Calculation: For upward motion of the ball, v = 0.
a = -g = -10 m/s² From formula (a),
O = u² + 2 (-10) × 320
∴ u² = 6400
∴ u = 80 m/s
For downward motion of the ball, u = 0.
a = g = 10 m/s²
From formula (b),
320 = 0 + \(\frac{1}{2}\) × 10 t²
∴ t² = \(\frac{320}{5}\) = 64
∴ t² = 8s
Time for upward journey of the ball will be the same as time for downward journey i.e., 8 s.
∴ Total time taken = 2 × t = 2 × 8 = 16 s
Ans: a. The initial velocity of the object is 80 m/s.
b. The total time taken by the object to reach the height and come down is 16 s.

ii.

Functions:
a. Iris: Iris controls the amount of light entering the eye by contracting and widening the pupil.
b. Ciliary muscles: They help the eye lens to adjust the focal length depending on the distance of the object by contracting or relaxing.
c. Retina: It is the screen inside the human eye which contains light sensitive cells. Image of an object is formed on this screen.
(Note: In ‘Label the diagram and explain’, students are expected to redraw the labelled diagram and write the explanation.)

iii. a. Electroplating is the process in which a less reactive metal is coated on a more reactive metal by electrolysis.
b. Corrosion of metallic articles can be prevented by isolating them from direct contact with air and moisture.
This can be done by:
1. Applying layer of paint, oil, grease or varnish on metal surface
2. Galvanising, tinning, anodising
3. Alloying, etc.

iv. Solution:
Power (P) = 1100 W = 1.1 kW,
Time (t) = 2 hour
Expense of using electric iron in April month
a. Energy = Power × time
b. Electrical consumption expenses = Energy consumed × charges per unit
Calculation : From formula (a),
Energy consumed in one day = 1.1 × 2 = 2.2 kWh
∴ Energy consumed in the month of April (i.e. 30 days) will be,
Energy = 2.2 × 30 = 66 kWh = 66 unit ….. (∵ 1 kWh = 1 unit)
From formula (b),
Electrical consumption expenses
= 66 × 5 = Rs 330
Ans: The expense of using iron for 2 hr daily in the month of April is Rs 330.

v. a. The substances taking part in chemical reaction are called reactants.
b. The substances formed as a result of a chemical reaction by formation of new bonds are called products.
c. Examples:
1. Formation of carbon dioxide gas by combustion of coal in air is a chemical reaction. In this reaction, coal (carbon) and oxygen (from air) are the reactants while carbon dioxide is the product.
2. Decomposition of calcium carbonate by heating to form calcium oxide and carbon dioxide is a chemical reaction. In this reaction, calcium carbonate is the reactant while calcium oxide and carbon dioxide are the products.

vi. a. Specific heat of a substance can be studied using this procedure.
b. The amount of heat energy required to raise the temperature of a unit mass of an object by 1 °C is called its specific heat.
c. According to the principle of heat exchange:
Heat energy lost by the hot object = Heat energy gained by the cold object In this activity heat absorbed by iron sphere is transmitted more in the wax, hence sphere goes deepest in to wax. While lead sphere absorbs less heat, resulting in less transmission of heat in the wax hence sphere goes the least depth in the wax.

vii. a. Roasting
b. Froth floatation method
c. Leaching
d. Electrolytic reduction
e. Calcination
f. Magnetic separation method

viii.

Question 4.
Answer, the following. (Attempt any 1) [5]
i. Explain partial reflection, critical angle, and total internal reflection with the help of a neat labelled diagram.
ii. Draw a concept map and explain classification of hydrocarbons based on carbon-carbon bonds with the help of examples.
Answer:
i. a. When a ray of light enters a rarer medium from a denser medium, it gets partially reflected i.e., part of the light gets reflected and comes back into the denser medium obeying the laws of reflection. This is called partial reflection.
b. The rest of the light gets refracted and goes into the rarer medium. As light is going from denser to rarer medium, it bends away from the normal i.e., the angle of incidence (i) is smaller than the angle of refraction (r).
c. According to Snell’s law, the refractive index of the material is constant. Hence, on increasing the angle of incidence the angle of refraction (r) increases.
d. For a particular value of i for which, the value of r becomes equal to 90°, is called the critical angle.

e. For angles of incidence larger than the critical angle, the angle of refraction is larger than 90°. Such rays return to the denser medium as shown in the figure. Thus, all the incident light gets reflected back into the denser medium. This is called total internal reflection.

ii. Classification of hydrocarbons based on carbon-carbon bonds:

Explanation:
a. Hydrocarbons: They contain only carbon and hydrogen atoms.
b. Saturated hydrocarbons: Hydrocarbons which contain only single bonds between carbon atoms. Alkanes are saturated hydrocarbons with general formula: C_nH_2n+2. For example, methane (CH₄), ethane (C₂H₆), etc.
c. Unsaturated hydrocarbons: Hydrocarbons which contain at least one double or triple bond between carbon atoms. Alkenes and alkynes are unsaturated hydrocarbons.
d. Alkenes: Alkenes contain one or more carbon-carbon double bonds. The general formula: C_nH_2n. For example, ethene (C₂H₄), propene (C₃H₆), etc.
e. Alkynes: Alkynes contain one or more carbon-carbon triple bonds. The general formula: C_nH_2n-2. For example, ethyne (C₂H₂), propyne (C₃H₄), etc.

SSC Maharashtra Board Science 1 Question Paper with Solutions