Maharashtra SSC Science and Technology Part 1 Board Paper July 2024

Q.1 (A)(i) In modern periodic table the non-metals are found in ....................... .

Q.1 (A)(ii) \(\mathrm{CuSO_4(aq) + Zn(s) \rightarrow ZnSO_4(aq) + Cu(s)}\).
This is .................. type of chemical reaction.

Q.1 (A)(iii) The unit of electric power is ................... .

Q.1 (A)(iv) We can see the sun even when it is little below the horizon because of ........................ .

Q.1 (A)(v) ................................... is one of the combustible component of L.P.G.

Q.1 (B)(i) Write the correlation :
Brass : Copper and Zinc : : Bronze : ..................

Q.1 (B)(ii) Write True or False :
Benzene is an aromatic compound.

Q.1 (B)(iii) Find the odd one out :
Myopia; Presbyopia; Hypermetropia; Retina

Q.1 (B)(iv) What is angle of refraction when angle of incidence is 0º ?

Q.1 (B)(v) Name two appliances which work on the principle of magnetic effect of electric current.

Q.2 (A)(i) Give scientific reasons : Sodium is always kept in kerosene.

Q.2 (A)(ii) Give scientific reasons : A simple microscope is used for watch repairs.

Q.2 (A)(iii) Give scientific reasons : It is necessary to manage the space debris.

Q.2 (B)(i) The absolute refractive index of water is 1.33. What is the velocity of light in water ?
(Velocity of light in vacuum = 3 × 10⁸ m/s)

Q.2 (B)(ii) Observe the figure and answer the questions given below.

[Figure: a block of ice resting on a wooden stand; a thin wire passes over the ice with two heavy weights hanging from its ends; the wire has cut through the ice but the ice above it has frozen again.]

(a) Name the phenomenon shown in the figure.
(b) Define the above phenomenon.

Q.2 (B)(iii) [Figure: the reaction \(\mathrm{2H_2S + SO_2 \rightarrow 3S\downarrow + 2H_2O}\) with an arrow A drawn above, from the reactants towards the products, and an arrow B drawn below, from the products back towards the reactants.]

(a) Identify the above chemical reaction.
(b) Name the type of reaction in A and B.

Q.2 (B)(iv) Rearrange the column 2 and 3 so as to match with the column 1.

Q.2 (B)(v) Define the following terms :
(a) Escape velocity
(b) Free fall.

Q.3 (i) What information will you get from the given reaction ?

\[\mathrm{CaCO_{3(s)} \xrightarrow{\Delta} CaO_{(s)} + CO_{2}\uparrow}\]

Q.3 (ii) Observe the following ray diagram and answer the questions given below :

[Figure: an object AB placed just beyond the focus F_o of a small convex lens marked “Objective lens”; the real, inverted, magnified image formed by it lies between the objective and a larger convex lens marked “Eyepiece”, near its focus F_e; the eyepiece forms a highly magnified virtual image far away.]

(a) Identify the instrument shown in the diagram.
(b) What is the combined effect of two lenses ?
(c) Write the use of the above instrument.

Q.3 (iii) Read the following paragraph and answer the questions given below :

Rainbow is a beautiful natural phenomenon. It is the combined effect of dispersion, refraction and total internal reflection of light. It can be seen mainly after rainfall. Small droplets of water act as small prisms. When light rays from the sun enter these droplets it gets refracted and dispersed. Then there is internal reflection and after that once again the light gets refracted while coming out of the droplet. All these three processes together produce the rainbow.

(a) Which three major phenomena are responsible for rainbow formation ?
(b) How does refraction take place ?
(c) Draw a diagrammatic representation of rainbow production.

Q.3 (iv) From the elements of second period of the modern periodic table given below, answer the following questions :

[The second-period elements are Li, Be, B, C, N, O, F and Ne.]

(a) Name the elements in which both the shells are completely filled with electrons.
(b) Name the element which has same number of electrons in both the shells.
(c) Which is the most electropositive element in this period ?

Q.3 (v) Explain on which factor the value of acceleration due to gravity ‘g’ depends.

Q.3 (vi) Explain the following terms :
(a) Metallurgy
(b) Ores
(c) Gangue.

Q.3 (vii) Give the names of the following satellite series developed by India :
(a) Satellite series actively working in the field of telecommunication, television and meteorological services.
(b) Satellite series specially working in the field of education.
(c) Satellite series to exactly locate position of any place on earth’s surface.

Q.3 (viii) (a) What is meant by anomalous behaviour of water ?
(b) Explain the role of anomalous behaviour of water in preserving aquatic life in cold climate.

Q.4 (i) Observe the following diagram and answer the questions given below :

[Figure: a coil ABCD placed between the poles N and S of a magnet, its ends connected to two conducting rings R₁ and R₂ on an axle; carbon brushes B₁ and B₂ press against the rings and connect the coil to a galvanometer in the outer circuit; arrows show the coil rotating in the magnetic field.]

(a) Identify the above diagram. 1
(b) Write the principle on which the above appliance works ? 1
(c) Write the working of the above appliance. 2
(d) Write the use of the above appliance. 1

Q.4 (ii) Read the following paragraph and answer the questions given below :

Carbon compounds contain many elements. The element hydrogen is present to a smaller or larger extent in majority of carbon compounds. The compounds which contain carbon and hydrogen as the only two elements are called hydrocarbons. Hydrocarbons are the simplest and the fundamental organic compounds. The smallest hydrocarbon is methane (CH₄), formed by combination of one carbon atom and four hydrogen atoms. We have already seen the structure of methane. Ethane is one more hydrocarbon. Its molecular formula is C₂H₆.

The carbon compounds having a double bond or triple bond between two carbon atoms are called unsaturated compounds. Ethene and ethyne are unsaturated hydrocarbons. The unsaturated hydrocarbons containing a carbon-carbon double bond are called ‘Alkenes’. The unsaturated hydrocarbons whose structures contain a carbon-carbon triple bond are called ‘Alkynes’. Generally the unsaturated compounds are more reactive than the saturated compounds.

(a) What is meant by hydrocarbon ? 1
(b) Name the smallest hydrocarbon. 1
(c) Define unsaturated compound. 1
(d) Differentiate between Alkene and Alkyne. 2